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问:隧道干燥室干燥成品率低怎么办? 答:在使用人工干燥设备进行干燥的砖瓦生产企业中,一般都使用隧道干燥室,使用室式干燥室的企业很少.隧道干燥室在生产过程中最容易出现的问题就是干燥产量或质量达不到设计要求,干燥成品率低的问题. 相似文献
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今年,我們对北京市豆店砖瓦厂东車間的隧道干燥室(干燥室全长36m,共有17条隧道,每条隧道的內寬为0.85m,高为1.30m,每条隧道可以容納干燥車24辆,干燥周期为40小时左右)进行了一次热工測定和計算,企图通过热工分析,了解隧道干燥室在干燥实心砖坯体过程中,热量的使用和分配情况,找出提高隧道干燥室热效率的途径,使今后設計的干燥室更为合理、更为完善。下面根据热支出逐項进行分析。 相似文献
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隧道干燥室的干燥制度包括温度制度、湿度制度、干燥介质的流速等。要调整隧道干燥室的干燥制度,就是要调整干燥室内的温度、湿度、介质流速、零压点位置等与干燥密切相关的参数。 相似文献
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针对我国国情而言,预计在10余年内小隧道干燥室在制砖工业中还会有大的发展而取代众多的自然干燥的制砖业。下面就隧道式干燥室的几个问题作如下探讨。1隧道式干燥室的规格由于制砖工业原料的不同。应采用不同规格。1.1隧道式干燥室的长度确定由于各种原料的干燥周期不同,因此, 相似文献
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1 我国砖瓦企业逆流式隧道干燥室发展情况
目前,我国砖瓦生产中砖坯干燥大部分采用逆流式隧道干燥室。干燥室的长度一般在50-60m,内宽1-1.5m,高约1m。如图1为负压排潮的逆流式隧道干燥室结构示意图。 相似文献
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根据多年生产经验,介绍了煤矸石淤泥空心砖的人工干燥原理、干燥介质温度和湿度对坯体干燥的作用以及热工参数的采用、干燥室风量与热量的测定、零压点的控制和室内温度、湿度曲线及坯体脱水、收缩曲线的确定等人工干燥的工艺管理。 相似文献
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A desiccant seed dryer operating in a closed loop was designed and fabricated to dry 1 kg of seed in about 6 hours. Silica-gel was used as the desiccant in the dryer, which was tested to dry onion seeds. The seeds were dried from initial moisture content of 8% to final equilibrium moisture content of 4.5% when drying air condition was maintained around 40°C and 20% relative humidity. 相似文献
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分析了棒形支柱瓷绝缘子伞背开裂的缺陷,探讨了缺陷产生的原因,指出这种缺陷的产生主要是刀刃磨损产生了负后角,使坯件制造过程中施加了不均匀负荷,车间湿度控制不当所致。采取了修正修坯刀和烘房相对湿度控制在75%等措施后,取得了一定效果。 相似文献
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In this paper, an attempt is made to predict the hourly mass of jaggery during the process of drying inside greenhouse dryer under the natural convection mode. Jaggery was dried until the constant variation in the mass of jaggery. Artificial neural network (ANN) is used to predict the mass of the dried jaggery on hourly basis. Solar radiation, ambient temperature and relative humidity are input parameters for the prediction of jaggery mass in each hour in the ANN modelling. The results of the ANN model are also validated with experimental drying data of jaggery mass. The statistical parameters such as root mean square error and correlation coefficient (R2) are used to measure the difference between values predicted by the ANN model and the values actually observed from the experimental study. It was found that the results of the ANN model and experimental are shown fairly good agreement. 相似文献
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An indirect forced convection solar dryer consisting of an air flat plate collector and a drying cabin was designed and fabricated to investigate its performance under the climate of Algiers. Drying experiments have been performed for spearmint leaves at different air flow rates in order to determine the drying velocity, the characteristic drying curve, the effective diffusion coefficient and the activation energy. A mathematical model based on thermal and mass balances over the component of the solar collector and the cabinet dryer was developed. Simulations are carried out for meteorological data of Algiers (Algeria). We analyse the effect of air mass flow rate, air temperature, products mass, collector area, air recycling rate on the drying time, the solar fraction and the efficiency of the dryer. 相似文献
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以广西南宁膨胀土为研究对象,设置不同温湿度条件引起的脱湿环境,测试不同脱湿速率作用下,膨胀土的收缩特性以及持水能力,预测不同脱湿速率作用下非饱和土体渗透曲线,并对膨胀土边坡雨水入渗过程进行数值模拟计算。试验结果表明,脱湿速率越小,膨胀土收缩变形越大,这说明自然条件下湿度大的气候里,经过缓慢蒸发,表层土体的膨胀潜势会较大。数值计算结果表明,脱湿速率较小时,降雨后边坡雨水入渗的影响深度较大,这说明,湿度大的气候条件下,长期的蒸发过程,会导致更大的降雨入渗深度,从而不利于膨胀土边坡的稳定。 相似文献
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相对湿度是决定混凝土诸多性能劣化进程和耐久性的重要参数,快速、准确的测量混凝土内部的相对湿度一直是试验上的一个难点.在分析总结传统插入探头测湿法不足的基础上,基于新型温湿度一体数字传感器,开发埋入式混凝土测湿新方法,该法具有体积小、自动、准确、快速、高效等特点.应用新方法测试C30普通混凝土和C60高性能混凝土在干燥收缩条件下早期相对湿度随龄期的变化,揭示其3阶段发展规律. 相似文献
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Innovative technologies are needed to make the life easy. The innovations are best used using renewable source of energy. Greenhouse solar dryer is a device used for drying purpose. Computational fluid dynamics analysis simulation is performed on greenhouse solar dryer when exposed to an ambient temperature on a hot sunny day for free convection and forced convection processes. The mass flow rate and the thickness of polycarbonate roof sheet material vary. The average temperature of the dryer is analysed using simulation. The maximum temperature obtained by forced convection is 71°C for 0.025?kg/s mass flow rate, which is 41% more than that obtained by natural convection. 相似文献
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目前我国砖瓦生产中,砖坯干燥大部分采用的是逆流式隧道干燥室,干燥室的长度一般在50m~60m,内宽1m~1.5m,高约1m。逆流式隧道干燥室的生产能力及工作效率显得十分重要,因此,要对干燥室做好调整和合理的技术改造。 相似文献