共查询到18条相似文献,搜索用时 93 毫秒
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适应低排放的电除尘技术探讨 总被引:1,自引:0,他引:1
针对高标准的排放要求以及将进一步提高的排放标准,对电除尘器是否能满足目前的排放标准和低排放要求进行了研究。通过对国内110个机组配套电除尘器实际应用情况调查和国外燃煤机组电除尘器应用分析,客观地评价了电除尘器对国内煤种的适应性,指出移动电极式电除尘器、双极异距电流体微粒聚合器、烟气调质、湿式电除尘器、低低温电除尘器等新技术的发展和综合应用是满足30mg/m3低排放标要求的最佳选择。 相似文献
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泡沫玻璃砖在烟囱防腐中的应用 总被引:1,自引:0,他引:1
火电厂燃煤烟气中存在一定量的SO3,会显著降低烟气的酸露点。由于湿法脱硫后烟温低于酸露点,烟气中的SO3与水蒸汽形成的硫酸蒸汽会凝结下来,造成混凝土烟囱的低温腐蚀。以2×135MW机组烟气脱硫技改工程湿烟囱防腐为例,详细介绍了烟囱内衬泡沫玻璃砖防腐的施工工序、技术要求及注意事项。 相似文献
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国家要求燃煤电厂锅炉要逐步改造为超低排放,相比新建锅炉或大型电厂锅炉,炼化企业自备电厂锅炉改造难度大。本文通过对炼化企业电厂锅炉现有环保设施和排放现状进行分析,对比了脱硫塔前干式除尘、塔内提级增效、塔后深度除尘等3种工艺技术方案的效果,结合已改造实例指出需关注设备腐蚀、SO3脱除、在线监测等方面问题,并提出深度改造技术方案和实施路线。 相似文献
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我国每年有上千万吨SO2排入大气,形成酸雨,造成农田酸化、建筑物腐蚀,并危害人体健康。燃煤造成的SO2排放量约占90%左右,因此燃煤烟气的脱硫问题已成为研究的重点。旋转喷雾干法烟气脱硫技术以其工艺简单,可靠、投资少、运行维护方便、运行费低而引起人们的重视,其后接电除尘的流程也已被国内外所接受。旋转喷雾干法烟气脱硫是将吸收剂通过高速旋转的离心喷雾机分散成液滴微粒,与烟气中的SO。和SO。反应。一般都采用石灰装液Ca(OH)。作为吸收剂,分裂成20μm~100μm的细粒液滴,在160℃左右的烟温下,迅速蒸发成为干燥的粉… 相似文献
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研究表明,燃料燃烧过程中不同的SO2/SO3转化率对选择性催化还原( Selective Catalytic Reduction,SCR)烟气脱硝的最低运行温度影响大,温度变化幅度为10~15℃。对燃烧高硫煤锅炉的SCR烟气脱硝,应控制更低的SO2/SO3转化率;对燃烧低硫煤锅炉的SCR烟气脱硝,通过适当提高SO2/SO3转化率,最大催化剂用量可减少一半、烟气阻力降低一半,可大幅降低SCR烟气脱硝建设成本和运行成本。 相似文献
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建立了烧结烟气中SO3的检测技术,包括SO3的采集装置和测定方法。实验结果表明:质量分数为80%的异丙醇适宜作为吸收液,方法的回收率为95.79%~102.80%,相对标准偏差为0.46%~1.38%。该技术能有效消除烟气中粉尘及SO2对测定的干扰,具有准确、可靠、方便等特点,可应用于烧结烟气脱硫等装置日常运行中SO3含量的测定。 相似文献
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随着脱硫装置的大量投运,燃煤硫分、运行人员操作水平、检修人员技术能力都直接影响着脱硫系统的安全性和经济性。结合钱电公司的运行实际,当燃煤硫分和负荷的变化,原烟气的SO2浓度低于2300mg/m3,采用2泵运行;SO2浓度超过2300mg/m3时,采用3泵运行,脱硫效率均能达到设计要求。为此,降低脱硫系统入口SO2浓度是提高优化运行的关键。脱硫系统在线仪表的准确性和数据的有效性,直接关系到脱硫系统的考核和脱硫电价的补助,对脱硫系统的安全、经济运行起到至关重要的作用。 相似文献
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湿式吸收法同时烟气脱硫脱氮技术进展 总被引:2,自引:5,他引:2
同时烟气脱硫脱氮技术是燃煤烟气SO2和NOx污染控制的发展趋势和研究热点。系统地介绍了氧化吸收法、络合吸收法等能实现同时脱硫脱氮的吸收法烟气净化技术,分析了其特点和存在的问题,并从技术集成、副产物利用、与现有脱硫装置的配套和理论研究等方面提出了其研究方向。 相似文献
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将灰色综合评价分析法引入湿法脱硫系统的烟气换热器综合评价,从技术和经济两个方面探讨了综合评价、优选烟气换热器的方法和过程,并以3种典型的烟气换热器技术为例进行了实际计算,给出了评价结果。 相似文献
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The influence of gaseous ammonia and sulphur dioxide on the formation of 2378-substituted PCDD/F on a reference flyash from a municipal waste incinerator has been investigated using a laboratory scale fixed-bed reactor. The reference flyash samples (BCR-490) was reacted under a simulated flue gas stream at temperatures of 225 and 375°C for 96h. The experiments were carried out in two series: first with simulated flue gas alone, and then with injection of NH(3) or SO(2) gas into the flue gas just before the reactor inlet. It was found that the injection of gaseous ammonia into the flue gas could decrease the concentration of both PCDD and PCDF by 34-75% from the solid phase and by 21-40% from the gas phase. Converting the results to I-TEQ values, it could reduce the total I-TEQ values of PCDD and PCDF in the sum of the flyash and exhaust flue gas by 42-75% and 24-57% respectively. The application of SO(2) led to 99% and 93% reductions in the PCDD and PCDF average congener concentrations, respectively in the solid phase. In the gas phase, the total reductions were 89% and 76% for PCDD and PCDF, respectively. Moreover, addition of SO(2) reduced the total I-TEQ value of PCDD and PCDF in the flyash and exhaust flue gas together by 60-86% and 72-82% respectively. Sulphur dioxide was more effective than ammonia in suppressing PCDD/F formation in flyash under the conditions investigated. 相似文献
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Because of the stringent pollutant emission standards introduced with the European Union guidelines for waste incineration, it is very important to optimize the flue gas cleaning systems which are able to result in a low environmental impact according to the emission limits. In this paper a thermochemical model has been proposed for the simulation of the flue gas cleaning system of an RDF incineration plant. The model simulates the operation of the flue-gas treatment section and the combustion section by using a simplified approach. The combustion includes the grate incinerator and the post-combustion chamber, while the cleaning section includes the NO(x) reduction process (urea injection) and the scrubbing of SO(2) and HCl (Ca(OH)(2) as sorbent). The modelling has been conducted by means of ASPEN PLUS code. The simulation results have been validated with the operating data. The model proposed by the authors can be a useful tool in both evaluating the efficiency of the gas cleaning system by verifying the environmental pollution of an incinerator power plant in nominal operating conditions and in forecasting the efficiency of the cleaning system in off-design operating conditions. 相似文献
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污泥掺烧技术在煤粉炉上应用的试验研究 总被引:2,自引:0,他引:2
通过污泥掺烧技术在煤粉炉上的应用试验,得出污泥的含水率对锅炉制粉系统的影响.掺烧前后对炉膛温度没有大的影响,随着污泥比例的增加,燃烧效率下降,烟尘浓度和SO2浓度降低. 相似文献