硫基复合肥装置的技术改造

介绍硫基复合肥装置技改后,既可生产硫基复合肥又可生产粒状MAP和DAP的工艺流程及设备选型;技改后的2套硫基复合肥装置,每年在淡季时生产粒状MAP和DAP 6万t,可创经济效益1 000万元。同时介绍全部用国产白钾代替进口红钾生产硫基复合肥的技术,每年生产50万t硫基复合肥,可节约原料成本8 000万元。     

TB610链板提升机链板结构的改进

提升机是磷复肥生产中为满足筛分、破碎要求必备的机械设备,链板提升机是大型磷复肥装置中首选的,针对其链板断裂影响系统生产,分析了相关构件在结构设计上存在的缺陷,提出了改进措施,取得了较好的效果。     

斗式提升机链板频繁断裂的处理

<正>我公司5000t/d干法水泥生产线水泥磨辊压机配套循环斗式提升机(型号NSE1000×45000)。该线于2011年1月投产,使用3年时间内斗式提升机运转正常,2014年初发生一次一根链条断裂事故,更换断裂链板之后,开始频繁发生链板断裂故障,每天停机时检查均有1至4块数量不等的链板断裂。     

硫基复合肥生产难点与解决措施

为了满足客户的需求,云南云天化红磷化工有限公司对30万t/a复合肥装置进行改造生产16-20-0-13硫基复合肥。分析采用液硫生产硫基复合肥遇到的难点,并结合装置生产实际情况,提出控制措施。通过不断调整配方、优化生产工艺指标,最终生产出高硫含量产品,利于加快公司产品结构升级及提高产品市场竞争力。     

硝酸铵联产高塔造粒硝硫基复合肥装置运行总结

介绍了硝酸铵联产高塔造粒硝硫基复合肥装置的建设、试生产及技术改进等情况.该装置采用加压管式反应器中和法生产硝酸铵溶液,并选用上海化工研究院提供的工艺技术生产高塔硝硫基复合肥.2012年12月18日至23日,累计生产高塔硝硫基复合肥（15-15-15）成品4 350 t,产品的单元素含量、总养分及粒度等质量指标均满足GB 15063-2009标准的要求.     

100kt／a硫基复合肥生产线的设计与运行

叙述江苏恒盛化肥有限公司磷铵厂100 kt/a硫基复合肥生产线的工艺流程、关键设备、操作指标、吨肥消耗和由于操作经验不足出现的问题及其解决措施.开车311天,70%负荷运行,生产硫基复肥6.48万t,实现利润600万元.     

中浓度硫基复合肥的生产技术

随着高浓度复合肥数量在市场上的递增,一些地区因其所销肥料产品养分固定,价位较高,而出现过剩。我公司通过市场调查与分析,利用高浓度(151515)硫基复合肥装置生产中浓度(1587)复合肥。介绍中浓度硫基NPK与高浓度硫基NPK的工艺流程和生产控制的异同点。     

南化20万t/a硫基高浓度复肥装置通过考核

南京化学工业 (集团 )公司磷肥厂 2 0万 t/ a硫基高浓度复合肥生产装置在试运行稳定的基础上 ,进行了 3天满负荷试车考核 ,共生产合格的硫基高浓度复合肥1151t,平均日产 383.6 t,生产能力达到设计标准。该2 0万 t/ a硫基复合肥生产装置是利用南化原 2 4万 t/ a磷铵装置经改造而成的。在试运行中 ,重点对混酸泵、搅拌浆等有严重腐蚀问题的设备进行了技术攻关 ,选用非金属耐腐蚀耐磨材料代替原来的金属材料 ,从而有效地延长了设备的运行周期。同时 ,对转化、吸收石墨交换器也进行了设备整改 ,扫除了设备障碍 ,使生产能力达到正常。目前 ,该 2 …     

硫基复合肥生产装置的技改

将原来采用磷酸一铵为磷源的硫基复合肥生产装置改用部分或全部过磷酸钙为磷源生产多品种硫基复合肥,使装置发挥了最大的生产潜能,效果很好。     

氨酸管式反应器喷浆造粒技术生产高氮尿基复合肥

介绍氨酸管式反应器喷浆造粒生产尿基复合肥的工艺流程及在造粒工况、产品质量、生产能力、操作弹性及综合成本等方面所具有的优势。并举例说明10万t/a传统料浆法硫基复合肥装置采用该技术改造为氯基复合肥的技改内容、新增设备、运行状况,投资仅105万元,可生产多种规格复合肥产品。     

新型金刚石链锯的链条受力分析

文章对用于大板切割新型金刚石链锯的链条张力进行了分析计算,由计算结果可知,新型金刚石链锯链条张力在试验装置条件下紧边张力为1705N,松边张力为1639N,且张力随着链轮直径的增加而减小;并由此计算并绘出了新型金刚石链锯链条围齿区整体受力分布图,由图可知,两轮结构下最大链条受力点为链条紧边最先与主动链轮啮合处。     

大型链板式斗提机斗链的快速更换方法

根据硫基复合肥大型斗提机斗链更换的实践,介绍快捷、高效、合理更换斗链的新方法,只需3d即可完成(过去6d)更换。     

中央链提升机链条国产化替代经验交流

1 提升机情况简介 我公司一线始建于1999年,由成都水泥工业设计研究院有限公司设计、中材建设有限公司总包,是国内水泥行业第一条交钥匙总包项目.该生产线的主机设备均选用进口产品,其中生料入库提升机选用的是德国AUMUND公司的产品,该提升机链条采用的是模锻中央链条,从2001年投入运行后,链条连续使用了15年,自201...     

Role of chain length in degradation process (chain breakdown)

The role of molecular weight of a chain in the chain breakdown in diluted solution at a constant concentration of chain molecules and constant temperature is discussed theoretically using the methods of the theory of the activated complex and kinetics of cooperative processes. The reaction starts at the certain molecular weight of the chain. The chain breakdown is the flat increasing function of the chain molecular weight. This function has a limit when chain molecular weight approaches infinity. Such dependence is explained by the increase of flexibility (following two theories) and increase of extra entropy of molecules of different sizes (following kinetics of cooperative processes. Unequal reactivity of chemically identical active centers links to the dependence of chain flexibility on the location of the more flexible part (place of reaction) of the chain. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1810–1817, 2002; DOI 10.1002/app.10356     

A lattice chain model for the thermal restructuring of nanoparticle chain aggregates

Chain aggregates composed of nanoparticles of carbon black, silica, titania and other metal oxides are produced commercially using aerosol reactors. Properties of nanoparticle chain aggregates (NCA), such as restructuring when heated in gaseous suspension, may play an important role during synthesis. It is hypothesized that in some cases a separate step in NCA creation is the restructuring of the chains initially formed by rigid body addition processes, for example cluster–cluster aggregation. A model of a freely rotating bead chain (zero activation energy for particle rotation) is adapted here from the polymer literature to describe nanoparticle chain restructuring resulting from interaction with the surrounding gas. The link between the physical properties of the surrounding gas and the dynamics of the nanoparticle chain is provided through the diffusion coefficient of the chain center of mass. We have studied the restructuring dynamics for primary particles of various diameters, different chain lengths and at different temperatures, and the model predicts a fast transition from a non-equilibrium initial chain configuration to a relaxed state. For a stretched chain of 64 particles, each 35 nm in diameter, in air at 1800 K and atmospheric pressure, the characteristic time for relaxation was 0.34 ms. This time is consistent with a 12 ms upper limit in restructuring time for soot aggregates reported in the literature. It is possible that in practice the approach to equilibrium may be delayed by constraints on particle rotation.     

The origin of chain entanglement: Correlations between entanglement and chain structure

A pseudotopological theory of chain entanglement has recently been developed, which shows that the entanglement junction is a binary hooking contact between two chains, and explicitly relates the entanglement behavior to chain structure. On the other hand, many empirical correlations between entanglement and chain structure have also been proposed to date, including those of Fox and Allen, Porter and Johnson, Privalko and Lipatov, Boyer and Miller, Graessley and Edwards, Aharoni, Lin, and Zang and Carreau. In this work, we show that the various empirical equations cited are variations of the same function, and can be derived as special cases from the theoretical pseudotopological equation. The various forms of the function nevertheless reveal different essential aspects of the chain entanglement behavior, and show that the traditional hooking view of chain entanglement is correct, and also provides a basis for the recent reptation-tube model.     

中双链刮板输送机复合断链检测系统的设计

中双链刮板输送机其机槽较宽且输送量大,其断链事故所带来的影响不言而喻。减小断链所造成的破坏程度和降低事故后的维修难度直接影响着企业的生产效率。目前本领域的断链检测较为单一,响应不够及时,可靠性有待考量。应用于中双链刮板输送机、通过多种组合、结合刮板输送机的结构点,可灵活布置的复合式断链检测系统,提高断链事故发生时响应速度,大大增加了断链检测的及时性,减小因断链带来的破坏和损失,为刮板输送的智能生产和在线监测提供一种可靠方法。