共查询到20条相似文献,搜索用时 250 毫秒
1.
2.
3.
对分解炉进行燃料分级燃烧改造,将燃料分级加入,在分解炉锥部形成还原区,还原窑内产生的热力型NOx,并抑制燃料型NOx的产生,同时配合操作优化调整,控制窑内燃烧气氛,减少窑头煤粉燃烧空气过剩系数,降低窑尾烟气氧含量,从而降低并稳定NOx的排放量. 相似文献
4.
煤粉燃烧过程中生成的NOx主要是燃料型NOx,约占总量75%~80%,其余为热力型NOx和快速型NOx。煤粉低氮燃烧技术的核心是控制燃料型NOx的生成。通过对煤粉锅炉按照“先炉内、后炉外”的总体技术路线,采用炉内De-NOx低氮燃烧技术结合SNCR喷氨技术,将低氮燃烧技术应用于煤粉锅炉,将烟气氮氧化物有效控制在200mg/Nm^3以内。大大减少氨水、液氧等脱硝剂的投入量,既降低了运行成本又有效缓解了脱硝剂对设备及烟道的腐蚀,使烟气NOx排放浓度符合我国《火电厂大气污染物排放标准》。 相似文献
5.
6.
通过对7条水泥生产线窑尾烟气成分的测试分析,探讨CO浓度、炉型、喷枪位置等因素对脱硝效率的影响。结果表明:窑尾烟室CO浓度与氮氧化物(NOx)浓度密切相关,CO浓度越高,烟气中NOx浓度越低,反之亦然;分解炉炉型对NOx排放有较大影响,单从NOx减排角度来看,旁置预燃室炉和流化床炉型有利于还原窑尾烟气中的NOx;选择性非催化还原脱硝(SNCR)系统喷枪安装在C5旋风筒入口或C5出口位置有利于脱硝效率的提升;分级燃烧名义脱硝效率在11.0%~46.3%之间,SNCR名义脱硝效率在75.9%~92.2%之间,综合名义脱硝效率在77.4%~93.1%之间。 相似文献
7.
随着河南省水泥工业大气污染物排放标准的出台,NOx的排放浓度要求不高于50 mg/Nm3。为此,2018年10月对水泥窑尾系统采用德国洪堡公司PYROCLON REDOX煅烧炉+SNCR技术优化组合进行了深度脱硝改造。改造结果表明,脱硝还原炉可一次前置性脱除回转窑内产生的热力型和燃料型NOx,脱硝效率91.39%左右;脱硝还原炉和优化后的SNCR协同组合,可实现窑尾烟囱NOx排放控制在50 mg/Nm3以下,氨逃逸控制在5 mg/Nm3,烧成系统电耗和煤耗无明显变化;脱硝还原炉改造不影响熟料产质量,烧成系统不易发生结皮、塌料等问题,系统运行稳定。 相似文献
8.
9.
分级燃烧技术和再燃脱硝技术在操作过程中除了分风、分煤等的硬件设施外,还需要围绕烧成主线的全系统精细化操作,粗放的操作模式不能有效降低氮氧化物的排放。由于现有的技术还不能实现低成本、有效地NOx的减排,因此,有必要进行观念的更新、技术的整合和参数的优化,提高低氮燃烧的效率,实现水泥窑炉的低氮排放。针对当前低氮燃烧技术的应用现状,我公司开发了全过程低氮燃烧技术,该技术是在分级燃烧技术的基础上进一步研发的降低系统NOx排放量的技术,将窑炉全系统的预热器、分解炉、回转窑、喷煤管、三次风管和煤粉及生料喂料作为一个有机的整体纳入系统控制,从抑制NOx的生成和还原已生成的NOx两方面入手,对燃料品质、燃料制备质量、燃料与助燃空气的合理分布,燃烧器的旋转动量与轴向动量等影响因素进行科学合理地调控,实现对窑炉温度场和气氛场的系统控制,实现窑炉全过程 NOx的形成控制及还原分解。 相似文献
10.
<正>水泥回转窑系统低氮燃烧技术是应用广泛、经济实用的NOx减排措施。它通过改变燃烧设备的燃烧条件来降低NOx的形成,具体来说,是通过调节燃烧温度、烟气中的氧气浓度及烟气在高温区的停留时间等方法来抑制NOx的生成或还原已生成的NOx。低氮燃烧技术包括低氮燃烧器、分解炉空气分级燃烧及分解炉燃料分级燃烧等。笔者参与了多个水泥厂低氮燃烧技术的选择,本文对此给予介绍,并举例说明分解炉 相似文献
11.
12.
13.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
14.
15.
The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
16.
我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
17.
Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
18.
19.
A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献
20.