共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
HCl干式净化过程平衡浓度计算及其应用 总被引:3,自引:0,他引:3
利用固体产生生成的能耗分析,在传统的热力学平衡公式中加入入修正项,计算HCl气体在利用石灰类吸收剂对其进行干式净化过程的平衡浓度,首次提出气固反应过程中反应气全的平衡浓度随着固体反应率的增大而上升的概念,计算结果表明:吸收剂在达到一定的反应率以后,HCl的平衡浓度随温度的上升而下降。利用平衡浓度随反应率和温度的变化特征可以解释传统的热力学平衡式所不能解释的一些实验现象,并可以利用平衡浓度来预测利用钙基吸收剂干式净化焚烧炉排的HCl的净化效率和吸收剂用量。预测结果可以判断干式净化的使用范围,局限性和改进方向。 相似文献
3.
4.
5.
旋风燃烧技术是将煤中大部分灰在旋风燃烧器内形成液态渣膜并从锅炉底部排出的一种锅炉燃烧技术,高碱煤燃烧过程中释放的气相Na、K等碱金属在高温下与熔渣反应生成富含Na、K的低温共熔物,并随高温熔渣一起从锅炉底部排出,在解决新疆高碱煤强沾污结渣问题上具有一定的优势。实验研究了高碱煤在高温熔渣内燃烧过程Na、K、Ca、Fe等碱性金属的迁移、转换特性及其高温熔渣对碱金属的捕捉特性。研究结果表明:高碱煤与高温熔渣反应过程中挥发的Na、K、Ca、Fe、S等元素与高温熔渣反应,生成富含Na、K的变钾铁矾、三斜钾沸石、新硅钙石、白矾、斜钾铁矾等硫酸复盐和硅铝系复盐;煤中部分Na、K、S等元素通过高温熔渣的固化作用被固化至熔渣中,从而形成了一定量的富集。 相似文献
6.
7.
针对生活垃圾化学链式燃烧过程中可能出现的污染和腐蚀问题,研究了金属载氧体和HCI之间的相互作用.采用热力学平衡方法,分析了NiO、Fe2O3、CuO和CaSO4四种载氧体在不同温度下,水分和碳参与反应时氯气的生成情况;并进行了HC1和Fe2O3的高温反应实验.结果表明:温度对氯气的生成影响显著;水分的加入会减少氯气的生成;在有水分参与的反应中,碳的加入会使氯气生成量降低.从氯气生成量角度考虑,温度在700~900K时,Fe2O3可用作生活垃圾化学链式燃烧过程的载氧体. 相似文献
8.
9.
10.
11.
《能源学会志》2020,93(4):1651-1665
Ash-related problems may induce serious slagging problems in gasification boilers, especially in the presence of alkali and alkaline earth metals at high concentrations. Suitable additives have shown to be promising in suppressing the slagging characteristics of high-alkali coal. In this study, the results of lab-scale experiments for Zhundong coal were demonstrated, especially in Yihua coal (YHc) here, with six common additives, which are kaolin (A), boehmite (B), corundum (C), quartz (D), raw vermiculite (E) and ripe vermiculite (F), at fractions of 3%, 6%, and 9%. The priority of reactions involving AAEM-based species was investigated by characterizing ash samples and thermodynamic equilibrium calculation by Factsage 7.2. The gasification residue of YHc alone (O) was adopted as the reference sample. All six additives could affect the release and transformation of Na, the capture order from high to low was A, F, E, O, B, D, and C, and the slagging risks of different samples were F, E, D, O, A, B, and C in sequence. Given both the ability of additives to capture alkali/alkaline earth metal-based species and the ATFs of the coal ashes, kaolin was proved as a suitable additive for YHc gasification. Furthermore, 6% (mass ratio) was considered the most reasonable addition ratio. 相似文献
12.
13.
14.
15.
16.
17.
For the cement clinker, a macroporous unconsolidated porous medium, seepage heat transfer theory can more accurately reveal its internal problems. Because of the macroporous characteristics of the cement clinker accumulation body, the changes in the physical properties of the surrounding air, such as viscosity, density, and so on must be taken into consideration in the cooling process of the cement clinker. This article introduces a real gas state equation into the unsteady state seepage equation, and improves the universal local thermal non‐equilibrium energy equation, and finally builds a seepage heat exchanger model of the cement clinker accumulation body macroporous porous medium. Using the COTDMA algorithm, this article obtains the unsteady state change progress of the air temperature and the clinker, and the influence of the porosity size on the cooling process, providing a theoretical reference for engineering applications. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res 43(2): 113‐123, 2014; Published online 01 July 2013 in Wiley Online Library ( wileyonlinelibrary.com/journal/htj ). DOI 10.1002/htj.21066 相似文献
18.
19.
从300MW高压给水加热器热力设计与计算出发,基于最优化设计的思想与方法,以胜利300MW高加热力设计与计算为例,探讨热力设计与计算优化设计问题,揭示热力设计与传热计算对决定高加性能和技术指标,重量,成本,运行可靠性等,所起到的至关重要作用,可供设计者参考。 相似文献