脱硫石膏刨花板制造工艺的初步研究

脱硫石膏为燃煤电厂烟气脱硫处理的一种化学副产物。本文分析讨论了脱硫石膏的性能及其与木材刨花混合制造石膏刨花板的可行性,初步探讨了脱硫石膏刨花板的制造工艺。结果表明,脱硫石膏用于制造石膏刨花板完全可行,其性能优于天然石膏生产的石膏刨花板,以木膏比０．１８生产的石膏刨花板材的各项性能均优于木膏比０．２２生产的板材。     

抗静电脱硫石膏纤维板的研制

以枝桠材及加工剩余物为主要原料制备木质纤维作为增强材料,工业排烟脱硫废弃物经煅烧制得的半水硫酸钙为粘结剂,加入高效复合缓凝剂增加脱硫石膏的初凝时间,满足生产工艺要求;加入导电炭黑使最终生产出的脱硫石膏纤维板的系统电阻降低,达到抗静电产品要求。试验结果表明:A型导电炭黑加入量为脱硫石膏质量分数的11%时,B型导电炭黑加入量为脱硫石膏质量分数的5%时,抗静电脱硫石膏纤维板的系统电阻可满足LY/T 1330-1999《抗静电木质活动地板》标准要求,此时抗静电脱硫石膏纤维板的物理力学性能达到相关标准要求。     

化学石膏废渣生产免烧砖、空心砌块

化学石膏废渣(主要指磷石膏和脱硫石膏废渣)是化工生产过程中排出的粉状固体废弃物。随着我国化学工业的不断发展,近年来排放量大幅度增加。据有关资料表明,工业副产化学石膏的年总排放量已超     

燃煤机组石灰石—石膏湿法脱硫仪表和控制系统(I&C)设计与应用

就吉林某电厂(2X330MW)机组烟气脱硫系统的实际运用,着重探讨石灰石-石膏湿法脱硫装置仪表和控制系统的设计与应用。     

600MW燃煤机组烟气脱硫装置的仿真设计研究

以某燃煤电厂600MW机组配套的烟气脱硫装置为研究对象,确定了处理工况条件,采用湿式石灰石-石膏工艺,对FGD系统进行了总体设计,完成了脱硫系统的选型与设计,并且进行了运行成本分析。     

石膏基粉刷材料

石膏基粉刷材料石膏基粉刷材料是一种新型的节能型粉刷材料，包括内墙与外墙粉刷材料两大类，其生产能耗为水泥的２０—３５％，保温隔热性能优于传统的抹灰材料。石膏基内墙粉刷材料是以氟石膏、脱硫石膏或天然二水石膏为主要原料，采用价廉的无机矿粉为保水剂，以复合缓...     

石灰石-石膏湿法烟气脱硫系统中压力变送器的选型及安装

通过工程实践总结,针对石灰石-石膏湿法烟气脱硫系统中压力变送器的选型及安装进行叙述。,     

脱硫石膏及不同垫层改良盐碱湖土造林技术研究

通过脱硫石膏及不同垫层改良盐碱湖土造林的比较试验,结果表明:施用脱硫石膏配合不同垫层均能有效降低土壤的pH值和全盐含量。不同垫层的改良效果为稻草+黄沙>黄沙>卵石+黄沙,其中稻草+黄沙垫层使0～40cm土壤pH值由9.34下降到8.21,全盐由2.123%下降到0.688%,国槐的保存率由65%提高到88%。     

湿式氨法烟气脱硫技术国内适用性探讨

分析了湿式氨法脱硫技术在我国烟气治理方面的适用性,通过与目前占主导地位的石灰石-石膏法进行综合性比较,发现湿式氨法脱硫技术工艺虽不够成熟,但其在经济和环境特性方面优势明显,非常适合我国国情,应大力发展并推广应用.     

高温高盐碱干旱地区高填方高速公路边坡土壤改良及植草研究

针对巴基斯坦高温干旱的自然条件及高填方高速公路边坡土壤高盐碱、贫瘠、板结等特点,通过添加有机质(甘蔗渣、河泥)、腐殖酸、脱硫石膏等改善土壤理化性质,并通过实地调查,选择适宜该地栽培的草本种类及种植方式进行边坡植草。结果表明:在土壤中加入甘蔗渣和河泥可以有效的改善土壤板结情况,最佳施用比例为50%原状土+20%甘蔗渣+30%河泥;在土壤中加入腐殖酸和脱硫石膏可有效的降低土壤pH值,降低土壤盐碱度,最佳配比为0.5kg/m^2腐殖酸+8kg/m^2脱硫石膏;在土壤中加入磷酸二铵可有效的增加土壤中氮磷含量,最佳添加量为22.5g/m^2。通过沿线物种调查,优选出高抗性本地品种狗牙根,并通过对比试验得出最佳种植方式为条植。该研究对于巴基斯坦高填方公路边坡绿化防护具有积极的现实意义及广阔的推广前景。     

Agroforestry on alkali soil: effect of planting methods and amendments on initial growth,biomass accumulation and chemical composition of mesquite (Prosopis juliflora (SW) DC) with inter-space planted with and without Karnal grass (Diplachne fusca Linn. P. Beauv.)

Growth responses of mesquite (Prosopis juliflora (SW) DC.) during establishment stage to planting methods and amendments were studied in a highly alkali soil (Aquic Natrustalf, ESP 94), at the experimental farm of the Central Soil Salinity Research Institute, Karnal in July, 1984. Six combinations of planting methods and amendments with and without Karnal grass (Diplachne fusca Linn. P Beauv) in the inter-row space were compared in a four times replicated field experiment in randomised block design. The mean plant height (MPH), diameter at stump height (DSH), diameter at breast height (DBH), lopped biomass 16 months past planting and total biomass attained in 2 years period were significantly less when inter-row space was planted with Karnal grass. The MPH (cm), DSH and DBH (mm) attained in 2 years period were 319, 43.4 and 15.1 in with grass as compared to 405, 53.4 and 20.3 in without grass treatments. Similarly, the total biomass attained in 2 years was about 3 times more where inter-row space was not planted with grass. Growth was better when mesquite was planted by auger hole and pit methods than in trench plantation, when the original soil was treated with gypsum at 3 kg plant^–1 and then refilled. However, using trenches of dimensions 30 × 30 cm and filled with a mixture of original soil, 3 kg gypsum and 8 kg farm yard manure plant^–1 appeared to be promising method for establishing mesquite plantations on highly deteriorated alkali soils. The effect of amendments on growth decreased in the order gypsum + FYM, gypsum + rice husk, gypsum, control. In two years period, 37 percent mesquite died in the trenches in which the original soil was left unchanged. Effect of treatments on nutrient concentrations and total accumulations in different segments of mesquite is discussed. Karnal grass gave 25.3 t ha^–1 green forage yield in 8 cuts without amendment in a growth period of 26 months proving its great potential as a folder crop for the adverse sites. The inorganic chemical composition of the shoots, including trace elements Fe, Mn, Zn and Cu, is such as to make this species a highly promising plant for the exploitation of alkali soils. Growing Karnal grass with mesquite for a period of about 2 years reduced soil pH and EC significantly and improved organic carbon and available N contents. The grass improved water infiltration rates and moisture storage in the lower layers of the profile.     

Development of Quercus ilex plantations is related to soil phosphorus availability on shallow calcareous soils

The objective of this study is to analyse the performance of Quercus ilex plantations established under semiarid conditions on different soils formed on calcareous and gypsiferous parent material. We studied eighteen 300?m² plots in which 1?year-old seedlings had been planted after subsoiling on the contour. Plots were stratified according to aspect (north and south) and previous land use/parent material: shrubland on limestone (LM-SH), shrubland on gypsum rock (GY-SH), and cropland on colluvium (CO-AG). Soils developed on limestone and colluvium had average rooting depths of 27 and 37?cm, respectively, and mean concentrations of active lime and phosphorus (P) of 130 and 190?mg?g^?1 and 10 and 19?mg?kg^?1, respectively. Soils developed on gypsum had a mean rooting depth of 26?cm, and a mean gypsum concentration of 73?%. Height and diameter of trees varied significantly according to parent material/previous land use but not to slope aspect. Mean height and diameter of trees were significantly higher in CO-AG plots than in LM-SH and GY-SH plots. Soil P and depth were the main variables explaining differences in dominant height across all 18 plots. In CO-AG plots mean height was negatively related to soil pH but positively related to soil P concentration. In LM-SH plots, mean diameter and height were negatively related to active lime concentration. This study suggests that soil P is a major determinant of holm oak performance in shallow calcareous soils and highlights the importance of conducting detailed soil studies in order to assess the viability of plantations with this species.     

木材水抽提物对石膏及石膏刨花板的凝固及其性能的影响

本文研究了在商用缓凝剂(Retardan P)的存在下木材水抽提物对石膏浆料和石膏刨花板凝固时间及其强度的综合影响。结果表明:1.木材水抽提物能使石膏浆料和石膏刨花板产生缓凝,并导致强度下降,其影响程度与树种和石膏质量均有关系。2.木材水抽提物能加强Retarda P的缓凝作用,并且用两者交互作用下石膏浆料的凝固时间,可以指示石膏刨花板的凝固时间。3.石膏刨花板的静曲强度受刨花树种的影响,但缓凝剂的添加量却无显著作用。     

石膏刨花板研究综述

石膏板具有优异的抗火性能,在轻型木结构中主要用作楼板和墙板的抗火覆面板。通过在石膏基体中复合木材刨花等植物纤维制备石膏刨花板,可不改变板材原有的生产制备工艺而提高其力学性能。生产石膏刨花板的石膏原料主要来源于工业石膏,刨花主要为农业或工业副产品,兼顾变废为宝和材料成本可控等优势,因此具有广泛的应用前景。文中综述了石膏刨花板中不同缓凝剂的作用机理、不同植物纤维类型的增强效果、后处理方式和外加剂对板材性能改善的机理等板材制备工艺,以及石膏刨花板的物理力学性能和抗火性能等研究现状,指出目前土木工程用石膏刨花板存在的不足及需进一步研究的方向,可为石膏刨花板的进一步系统研究以及工程应用提供参考。     

刨花形态,树皮含量及石膏质量与石膏刨花板性能的关系

对刨花形态、树皮含量及石膏粉质量与石膏刨花板性能之间关系的研究结果表明:保持一定的刨花长度有利于提高石膏刨花板的静曲强度;石膏刨花板的静曲强度随着木刨花中树皮含量的增加而下降,但把树皮作为填料加入石密刨花板能使板子强度得以提高,不同产地的石膏粉制成的石膏刨花板性能差异很大,按建筑石膏粉标准测定的性能指标及相组成与石膏刨花板的性能之间无显著的相关关系。     

麦秸/石膏复合材的工艺研究

以麦秸和石膏为原料,采用铺装生产工艺,通过单因子试验,研究原料形态、料膏比、乳白胶加入量和原料预处理方式等工艺因子对麦秸/石膏复合材性能的影响,并利用体视显微镜和扫描电子显微镜观察复合材的胶接状况。结果表明:料膏比10%、原料筛网目数10～20目、乳白胶的加入量12.5%、麦秸经热水处理3h,所制备的麦秸/石膏复合材各项物理力学性能较佳,指标可达到LY/T1598—2002石膏刨花板标准合格品的要求。     

烧结烟气脱硫系统的防腐蚀问题

以烧结烟气脱硫工艺为例,指出了脱硫装置的主要腐蚀部位,分析了产生腐蚀的原因,探讨了烧结烟气脱硫系统中所采用的各类防腐蚀技术、防腐材料,提出了相应的对策与建议。     

钠-钙双碱法工艺在高温烟气脱硫中的应用

分析了某厂3台加热炉烟气脱硫系统采用的“钠-钙双碱法”的化学原理及技术工艺流程,阐述了该脱硫技术的特点,同时指出了双碱法脱硫工艺需解决的问题。研究表明：钠-钙双碱法脱硫工艺脱硫效率．高,运行费用相对较低,操作方便,无二次污染,废渣可综合利用,是当前较为理想的实用型脱硫技术。     

石膏刨花板的生产工艺及其应用前景

石膏刨花板是以建筑石膏为胶凝剂, 以刨花为加强材料的新型建筑板材.本文叙述了石膏刨花板的特点和生产工艺; 介绍了芬兰、挪威等国石膏刨花板的生产现状, 论述了我国发展石膏刨花板的可能性和必要性, 并提出了几点建议.