燃煤热风炉在喷雾干燥器中的应用

介绍喷雾干燥器热风供应系统即燃煤热风炉的选定;对各种燃料的热风炉进行了技术经济比较及目前的使用情况.新增利润为原利润的55.6%.     

直燃煤热风炉在聚合氯化铝喷雾干燥中应用

我公司8000t／a聚合氮化铝喷雾干燥热风源原采用间接式燃煤热风炉供热，热效率为70％。经过3年多的运行，热风炉热交换钢体因长期在高温下工作，出现焊缝开裂，经常停车检修，热效率也逐步下降，有时因焊缝开裂，造成烟道气中的粉煤灰带入产品，影响产品质量。     

喷雾干燥塔的几种燃煤热风炉的热效率分析比较

煤在中国储量巨大,使用方式多种多样,燃烧设备和燃烧技术的不同,其燃烧效率相差较大。如何选择最好的燃烧方式,需要从多方面去考虑。本文主要介绍对比了喷雾干燥塔中煤气热风炉、水煤浆热风炉、链排炉、煤粉炉的燃烧状况和能源消耗情况。     

几种燃煤热风炉应用于喷雾干燥塔的分析比较

介绍了不同燃煤方式的热风炉的结构,燃烧机理及各自特点.其配套于喷雾干燥塔生产不同工艺陶瓷墙地砖,可替代燃油燃气热风炉,提高了热效率,降低了能耗及生产成本.     

几种燃煤热风炉应用于喷雾干燥塔的分析比较

介绍了不同燃煤方式的热风炉的结构,燃烧机理及各自特点。其配套于喷雾干燥塔生产不同工艺陶瓷墙地砖,可替代燃油燃气热风炉,提高了热效率,降低了能耗及生产成本。     

几种燃煤热风炉应用于喷雾干燥塔的分析比较

介绍了不同燃煤方式的热风炉的结构,燃烧机理及各自特点。其配套于喷雾干燥塔生产不同工艺陶瓷墙地砖,可替代燃油燃气热风炉,提高了热效率,降低了能耗及生产成本。     

喷雾干燥器的煤粉热风炉系统的设计

本文全面介绍了煤粉热风炉系统的总体设计及其工作原理,重点阐述了与燃烧、排渣等有关的结构。并指出该系统具有较好的应用效果和经济效益。适宜在建陶行业推广应用。     

新型燃煤高温热风炉

分析当前我国干燥热源的发展现状及干燥工业的实际要求,介绍了一种新型高效,长寿命,低污染的燃煤高温热风炉。     

高温热管热风炉系统在喷雾干燥上的应用

如果两个亲本表型，则杂交后代产生超亲个体的可能性较大。利用杂种优势、亲缘系数分子标记可直接鉴定亲本间的遗传多亲笥。本研究主要是确定了７个硬粒红色春小麦材料ＤＮＡ多态性的范围，研究以分子标记为基础的多样性和以亲缘系数为基础的遗传多亲性的关系，鉴定遗传多样性与这７个亲本双列杂交下Ｆ１表型的关系。     

喷雾干燥塔五种燃煤方式的综合分析

本文根据实际使用效果,介绍了喷雾干燥塔五种燃煤方式的工作原理及特点,并从粉料工艺性能、燃煤适应性、操作及控制、建设投资、运行成本等方面进行了综合分析。     

实验室用压力式喷雾干燥器的研究

实验室用压力式喷雾干燥器是目前建筑陶瓷行业所急需的.笔者主要介绍了研究本课题的意义及创新之处,并阐述了本课题的研究内容及关键技术.     

Influence of Atomizing Parameters on Droplet Properties in a Pulse Combustion Spray Dryer

A pulse combustor employed in a spray-drying system offers a new approach for liquid atomization that yields high-quality powders at low cost. Using a pulse combustion atomizer, there is no need for any form of nozzle dispersion and its atomization mechanism differs from those of conventional atomizers, such as rotary atomizers and pressure and pneumatic nozzles. In this work, based on the analysis of atomization mechanism, experiments of unsteady pulsating atomization were carried out in an experimental system of a Helmholtz-type pulse combustor. An optical analyzer was used for measuring the mean diameter of atomized droplet and droplet distribution. The effects of liquid feed rate, air flow oscillatory frequency, and liquid viscosity on atomized droplet size and size distribution were investigated and analyzed. The results indicate that the uniform droplet size distribution can be obtained under the conditions of a low feed rate, high-frequency pulsating flow, and moderate viscosity. The range of the droplets' Sauter mean diameter (SMD) is between 50 and 80 µm. The pulsating air flow from the pulse combustor can be used to atomize liquid or slurry without a nozzle and the atomizing quality can meet the requirements of spray drying.     

Influence of Atomizing Parameters on Droplet Properties in a Pulse Combustion Spray Dryer

A pulse combustor employed in a spray-drying system offers a new approach for liquid atomization that yields high-quality powders at low cost. Using a pulse combustion atomizer, there is no need for any form of nozzle dispersion and its atomization mechanism differs from those of conventional atomizers, such as rotary atomizers and pressure and pneumatic nozzles. In this work, based on the analysis of atomization mechanism, experiments of unsteady pulsating atomization were carried out in an experimental system of a Helmholtz-type pulse combustor. An optical analyzer was used for measuring the mean diameter of atomized droplet and droplet distribution. The effects of liquid feed rate, air flow oscillatory frequency, and liquid viscosity on atomized droplet size and size distribution were investigated and analyzed. The results indicate that the uniform droplet size distribution can be obtained under the conditions of a low feed rate, high-frequency pulsating flow, and moderate viscosity. The range of the droplets' Sauter mean diameter (SMD) is between 50 and 80 µm. The pulsating air flow from the pulse combustor can be used to atomize liquid or slurry without a nozzle and the atomizing quality can meet the requirements of spray drying.     

喷雾干燥塔的节能方法

本文简要介绍了喷雾干燥塔的使用特点,并探讨了其节能方法。     

Experimental Study and CFD Modeling of Wall Deposition in a Spray Dryer

The wall deposition phenomenon in a pilot-scale spray dryer was investigated based on mathematical modeling and experimental trials. For this purpose, the governing equations were obtained and solved numerically by applying a mathematical modeling technique and an open-source computational fluid dynamics (CFD) software. The wall deposition, velocity distribution of the existing phases, and droplet trajectory in the drying chamber were determined. The effect of the operating parameters including the feed flow rate, inlet concentration of dissolved solid, and initial droplet diameter on the air flow pattern, droplet trajectory, and wall deposition was investigated. Through the experiments, the wall deposition of powder product in different positions of the drying chamber was measured. In modeling part of this study, we attempted to determine the effect of particle diameter on the percentage of wall deposition and the position where it occurred.

The model results obtained for wall deposition were compared with collected experimental data and good agreement was observed.     

喷雾干燥机节能探讨

本文简要介绍了陶瓷面砖原料制备设备喷雾干燥机的工作原理和使用特点,重点探讨了喷雾干燥机的节能方法。它将对陶瓷厂的节能具有一定的参考价值。     

Crystallization and Drying of Milk Powder in a Multiple-Stage Fluidized Bed Dryer

The rationale of this study has been to use fluidized beds to crystallize amorphous spray-dried skim milk powders with multiple stages of processing at different temperatures and humidities with the aim of rapidly making mostly crystalline powders. This paper discusses the performance of a multiple-stage fluidized bed dryer, and a combination of crystallization of lactose in spray drying at high humidity (lactose nuclei formation) and subsequent fluidized bed drying. Two different combinations of spray dryer and multi-stage fluidized-bed dryer have been suggested to crystallize lactose in skim milk powder. The results show significant improvements in the crystallinity of the powders. Moisture sorption test and X-ray diffraction analysis were used to assess the crystallinity of the powders. The processed powders that were crystallized in a humid-loop spray drying combined with a two-stage fluidized-bed dryer/crystallizer showed 92% improvement in lower amorphicity by processing at different stages of 70°C, 50% RH and 80°C, 50% RH for 15 minutes. The conventionally spray-dried powders that were crystallized in a three-stage fluidized-bed dryer/crystallizer showed 87% improvement in lower amorphicity (less moisture sorption) by processing at different stages of 60°C, 50% RH; 70°C, 40% RH; and 80°C, 40% RH for 20 minutes. The multiple-stage fluidized bed system showed distinctive potential to crystallize lactose significantly in skim milk powder using an industrial-feasible process.     

Kinetic Modeling of Reactive Absorption of Carbon Dioxide in a Spray Dryer

A semi‐empirical kinetic correlation was obtained through a shrinking core model assumption for reactive absorption of CO₂ with NaOH solution by applying response surface method analogy in a laboratory‐scale spray‐dryer absorber. The effect of approach temperature, absorbent concentration, nozzle diameter, and L/G ratio on the kinetic coefficient was studied and the optimum operating conditions to reach the maximum absorption were determined.     

Physicochemical Characteristics of Date Powder Produced in a Pilot-Scale Spray Dryer

Date fruit is a good source of bioactive compounds and natural sugar. It has the potential to be utilized as a substitute for added sugar. Although several forms of dates—such as fresh dates, date paste, and date syrup—are available in the market and used for different applications, free-flow date powder would be highly beneficial in improving shelf-life, ease of handling, and blendability with various foods prepared domestically and in industry. The objective of this study was to produce date powder in a pilot-scale spray dryer and determine its physicochemical qualities. Date powder was produced at eight processing conditions (2 carrier agents (maltodextrin (MD) and gum arabic (GA) × 2 inlet air temperature (150°C and 170°C) × 2 feedstock flow rates (25 ml/min and 40 ml/min)). To the carrier agent was added at 0.4 kg per 1.0 kg of date fruits (dry weight basis), and the feedstock to the spray dryer was prepared at 20% concentration. Date powder was obtained in all eight treatments. Color (L*a*b* values), moisture content, bulk density, wettability, solubility index, hygroscopicity, microstructure analysis (using scanning electron microscope (SEM)), and total phenolic compounds were determined for the spray-dried date powder. The physicochemical characteristics of date powder varied significantly with respect to the processing conditions. Although physical properties of date powder were significantly affected by the carrier agent, there was no difference in total phenolic compounds between date powders produced with MD and GA. An SEM study revealed that date powder produced with MD had smooth, regular-shaped spherical particles but with severe agglomeration. Date powder with GA had relatively smaller particles of irregular sphere with dented surfaces.     

GE水煤浆气化技术现状和应用前景

GE水煤浆气化技术是第二代煤气化技术中发展最迅速、成就最显著的生产技术之一,是美国通用电气能源集团推广的具有世界领先的煤气化技术,我国对于GE水煤浆气化技术的应用最为广泛。讨论了GE水煤浆气化技术原理、特点、现状,并对该技术的应用前景进行了分析、总结。