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石灰石-石膏湿法烟气脱硫技术 总被引:1,自引:0,他引:1
介绍了石灰石-石膏湿法烟气脱硫技术的原理、工艺流程。石灰石-石膏湿法烟气脱硫技术具有脱硫效率高、技术成熟、单塔处理烟气量大、适用于各种煤种的烟气脱硫、吸收剂(石灰石)资源丰富,价廉易得、脱硫副产物(石膏)便于综合利用,经济效益显著等特点。 相似文献
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循环流化床锅炉炉内脱硫无法满足排放要求时,需要对排烟进行进一步净化。烟气净化工艺主要有石灰石-石膏湿法烟气脱硫和循环流化床半干法烟气脱硫。为了比较2种工艺的经济性,建立了技术经济分析模型,对比分析了满负荷时炉内脱硫效率70%条件下的经济技术指标。分析结果表明,循环流化床半干法烟气脱硫的运行成本和总成本相对较低时,要求硫含量分别低于1.1%和2.1%;循环流化床半干法烟气脱硫的脱硫剂成本占比较大,而石灰石-石膏湿法烟气脱硫的电费占比相对略大;石灰石价格、上网电价和年运行时间是影响脱硫成本的主要因素,石灰石对脱硫成本的敏感度大于上网电价;石灰石价格低于112元/t时,石灰石-石膏湿法烟气脱硫的运行成本更高;上网电价低于0.43元/kWh时,石灰石-石膏湿法烟气脱硫的运行成本相较更低;循环流化床半干法烟气脱硫总成本在石灰石价格、电价、年运行时间的研究波动范围内相对较小;相较于常规炉内脱硫技术,超细石灰石炉内脱硫技术的炉内脱硫成本较低,与循环流化床半干法烟气脱硫工艺相结合的综合优势更显著。 相似文献
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焦炉一般用焦炉煤气燃烧进行加热,焦炉烟气中含SO_2 100 mg/m~3~300 mg/m~3,因此焦炉烟气一般为大流量、低含硫量烟气所以需要对焦炉烟气进行脱硫。结合焦炉烟气特点,主要推荐氨法脱硫(湿法)、石灰石-石膏法脱硫(湿法)、循环流化床半干法烟气脱硫三种技术。本次需改造的脱硫设施采用的是石灰石-石膏法脱硫(湿法),依据装置的特点,考虑各方面因素,采用加装高效脱硫装置的改造方案。 相似文献
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利用石灰石-石膏湿法烟气脱硫模拟试验装置分析探讨脱硫净烟气中细颗粒物物性与脱硫浆液中晶体粒度分布、浓度、形貌及元素组成间的关系,并试验考察了烟气组分及脱硫工艺条件对脱硫净烟气中细颗粒物排放的影响。结果发现:石灰石-石膏湿法烟气脱硫过程中可生成大量亚微米级细颗粒,生成的细颗粒物性与脱硫浆液中晶体物性存在密切关系,脱硫操作参数如空塔气速、液气比等对脱硫浆液液滴夹带量存在显著影响;脱硫浆液蒸发夹带是石灰石-石膏法脱硫过程中生成细颗粒物的主要来源,通过抑制细小石膏晶粒的形成及优化脱硫工艺参数可减少石灰石-石膏湿法脱硫过程中细颗粒的形成。 相似文献
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M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
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. 相似文献
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Cheng-Le Zhao Shane Porzio Alan Smith Haiyan Ge H. T. Davis L. E. Scriven 《Journal of Coatings Technology and Research》2006,3(2):109-115
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. 相似文献
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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. 相似文献
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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. 相似文献
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中蓝晨光化工研究院有限公司《塑料工业》编辑部 《塑料工业》2009,37(3)
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. 相似文献
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中蓝晨光化工研究院《塑料工业》编辑部 《塑料工业》2007,35(3):1-25,67
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。 相似文献