MLK矿渣磨的调试研究

以MLK2650矿渣磨调试为例,介绍了MLK矿渣磨初期调试和正常生产调试的方法和步骤。研究发现:良好的矿渣磨系统热量平衡和风量平衡是磨机平稳、安全运行的保障;设备的正常、物料的稳定、仪表的准确是磨机连续长期运转的根本;风量、风温、压差、辊压力、喷水、选粉机转速等参数的最优配置是磨机优质、高产的关键。     

立磨辅助设备的常见故障及处理

立磨的辅助设备是为立磨的安全可靠运行提供润滑、冷却、密封和施加研磨压力的一组设备，以我公司ATOXR－５０型立磨和MLS４５３１型立磨为例，其辅助设备通常有：密封风机、主减速器润滑站、张紧站（或液压站）、磨辊润滑站等。现将我公司辅助设备常见故障及处理经验介绍如下。１密封风机密封风机的作用是向磨辊轴承气封腔鼓入一定压力的气体，使气封腔里呈正压，防止磨机跳停或运行中偶尔出现的正压气流携带粉尘进入轴承腔里损坏轴承。其常见故障是密封风机电流波动和密封压力低报。中控显示密封风机电流降低性的波动，则多为风机三角…     

冀东矿渣立磨磨辊标定方法的改进

<正>0前言立磨运行中磨辊的位置直接反映了料层的厚度,而受研磨压力、风量、风速和物料性质等众多因素影响的料层厚度又是确保立磨稳定运行的重要参数。料层太薄,磨机振动严重;料层太厚,磨机负荷大而粉磨效率降低,成品烘干不充分,容易结块,严重时也会造成剧烈震动。因此在中控操作中对料层厚度的准确控制十分关键,而磨辊位置的准确标定又是今后运行中料层厚度准确控制的基础。对我公司生产的JLMK46.2.2X矿渣立磨,原采用的磨辊位     

生料立磨由磨内喷水改为无水操作的经验

<正>我公司7 200t/d生产线采用双系列六级旋风预热器,生料粉磨系统选用了2台RM51/26/435生料立磨,配套主机功率2 840k W,设计台时产量300t/h。9MW纯低温余热发电项目于2014年1月投入运行,运行后,磨机产量降低,并出现了一些问题。为此,对生料立磨进行了一系列工艺参数改进。1出现的问题余热发电系统运行前,生料磨用窑尾风机循环风来补充风量,磨机系统入磨风温为210℃,运行后,入磨风温为125℃,台时产量由280t/h降为240t/h,磨机     

MPS原料立磨液压系统故障分析及处理

某5　600 t/d水泥生产线,原料立磨为德国非凡磨MPS5300B。磨机临时停机检修后,重新开机时发现抬辊正常,但降辊后在加载阶段需约1 h才能达到设定压力,加载速度慢;磨机正常运行后,加载压力不能保压,高压泵启动频繁,每次运行时间较长。MPS生料立磨液压系统     

小辊压机+大管磨机水泥联合粉磨系统的优化升级改造

在采用高压小循环工作模式的辊压机+大管磨机水泥联合粉磨系统中，熟料易磨性差，辊压机循环预粉磨系统无打散及分选设备，入管磨机物料粗、磨机负荷高。在预粉磨环节新增选粉系统，对球磨机重新分仓，改造后辊压机实现稳定做功，降低了入管磨机物料细度及管磨机负荷，提升了管磨机研磨效率；台时产量提高20 t/h，工段电耗降低4 kWh/t。     

复合陶瓷磨辊耐磨件在煤立磨中的应用实践

甘谷祁连山水泥有限公司2　500 t/d水泥熟料生产线于2010年3月投产运行,煤粉制备系统配置HRM1700M立式煤磨,生产能力≥20 t/h,成品细度R0.08≤12%,入磨风温(上限)＜300 ℃,出磨风温80～95 ℃,出磨风量70　000 m3/h,磨机压差5　000～6　500 Pa。投产以来,煤磨台时产量随磨辊耐磨件磨损波动较大,煤粉细度偏高、煤磨效率不稳定。2016年3月,由于公司窑系统进行了提产改造和采购原煤质量降低,煤粉细度无法满足水泥窑系统煅烧要求,所以将煤粉筛余值由原来14%调整为5.5%。该公司用煤全部为烟煤,工业分析、煤灰化学分析分别见表1和表2。     

ATOX生料磨7000小时运行经验

我厂的ATOX35生料磨自1988年7月投入运行到1990年12月止,因磨辊衬板磨损已进入后期,窑系统需大修而有充裕的停立磨检修时间,于是此时更新了磨辊磨盘衬板。至此,该立磨共计运行7000小时。因有关这一系统的流程已在本刊1989年12期报道过,本文将介绍该磨的使用情况,以供参考。一、运转概况 1.产量该立磨于1988年7月2日开始调试,7月13日正式投入运行,投产后一段时间内,磨机的产量一般在120～140吨/时,主要是因磨机液压系统的单向阀有问题而导致研磨压力偏低,后采用合金制作的弹簧座,研磨压力得到提高,磨机的台时产量逐渐上升,1988年9月26～28日的日平均台时产量都达到设计能力,     

通过压力调节控制生料粉磨系统

1系统工艺流程和压力参数我公司生料制备是Φ4.6m ×12m闭路中卸烘干兼粉磨系统,其工艺流程如图1所示。A ～G为磨系统压力测点。在正常生产情况下,磨系统各点压力均平衡稳定。正常时各参数见表1。通过对生料粉磨系统压力的调节控制,可以保证磨机系统的正常通风,以满足烘干兼粉磨作业的需要;同时可以确定系统的运转情况,以便更好地采取有效措施,保持均衡稳定的压力。2各压力参数的变化和调节C 与 A 和 B 的压差,表征了磨内通风的阻力大小。压差增大表示磨内可能负荷过大或隔仓板篦缝堵塞。这时应仔细分析压差增大的原因,确定原因后,果断采…     

高寒环境下Φ3.8 m×13 m滑履磨的调试

<正>1存在的问题地处东北地区的一座水泥粉磨站的配套磨机为Φ3.8m×13m双滑履磨,该磨机配套了GDRD类高低压稀油润滑装置,稀油站型号为GDR-2.5×2/80P磨机主电机功率2500kW。该磨机在调试初期运行极不正常,始终不能保持磨机连续稳定运行,严重制约了粉磨系统能力和经济效益的发挥。其中,存在的主要问题如下。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。