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新型干法水泥窑取代立窑后,废气的氟化物排放浓度明显减少,但NOx排放浓度增大,NOx污染将成为水泥厂废气污染的突出问题,宜通过推广应用改善生料易烧性、优化窑系统操作参数及低NOx燃烧器等技术,减少水泥窑废气NOx排放。新型干法水泥生产线废气的SO2排放浓度与原燃料硫含量及开停磨等因素有关,不宜简单地确定某新建水泥窑生产线脱硫效率来估算废气SO2排放浓度。另外,随着越来越广泛利用尾矿污泥等废弃物煅烧水泥熟料,水泥窑废气重金属污染也需引起重视,合理选用及控制废弃物的掺量。 相似文献
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1 大管道气体流量计在余热发电中的应用 新型干法水泥生产中气流活跃在整个过程,在窑系统中热风有一次风、二次风、三次风,还有冷却机形成的大量热风。在热风循环过程中一部分热风用于原料和煤粉的烘干,还有一部分气体则作为废气被排放在大气中。在2500t/d、5000t/d等规模的水泥生产线中为实现低温废气综合利用, 相似文献
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本文对水泥窑协同处置污染土壤进行了示范应用研究。污染土壤热解析工艺与水泥窑协同处置工艺相结合,以窑头热风为热源采用顺流式回转烘干脱附工艺热解析处置后的污染土壤进入生料配料系统,随生料进入后续熟料煅烧工序,含小分子有机物的热解析气体通过两段式篦冷机进入回转窑内彻底燃烧分解。示范应用期间水泥窑协同处置污染土壤过程中无结皮风险,对窑工况影响较小,与对照组相比,协同处置过程中大气污染物排放浓度、常规物理性能指标变化较小;煅烧出的熟料中重金属浸出量低于规范限定含量限值。根据以往运行经验,协同处置含重金属的废弃物必须配备较为完善的尾气处理系统。 相似文献
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大连水泥集团5 000t/d水泥生产线利用水泥窑协同处置城镇污泥,其窑尾废气的成分复杂,含有多种污染物。针对窑尾废气特点,将原电收尘器改造为袋收尘器,采用玻纤覆膜滤袋并对壳体采取防腐措施。 相似文献
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随着逐年增加的城市污水产量,作为城市污水处理副产品的污泥,也随产量的增长急剧增加,迫在眉睫的污泥资源化和无害化处理问题凸显。因此,通过协同处置水泥污泥有害物质释放特性研究,有毒有害物质的释放特性在污泥协同处理过程中显现,利用水泥窑协同处置污泥技术以其独特的优势,旨在解决水泥窑协同处置污泥技术的运用。 相似文献
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VOLUME REDUCTION AND BIOLOGICAL STABILIZATION OF SLUDGE IN SMALL SEWAGE PLANTS BY SOLAR DRYING 总被引:2,自引:0,他引:2
High investments, high dumping costs and high electrical energy consumption turn waste water treatment in small sewage plants an expensive process. Therefore, the University of Hohenheim and the company Thermo-System have developed a fully automatic low temperature solar drying plant allowing further stabilization and volume reduction of sewage sludge by continuous mixing and aerating. To test the potential of the technology, the drying process was investigated in a commercially operated municipal sewage treatment plant with aerobic sludge digestion. During experiments, the changes of the dry solids concentration and the volatile solids, the climatic conditions and the energy consumption were constantly measured and documented. It was found, that the sludge could be dried from a dry solids concentration of 3 to 93% w/w in 64 (flocculated) or 83 days (non-flocculated). At the same time, the volatile solids content was reduced from 65 to 34% w/w, respectively. The electrical energy consumption was only 22 to 28 kWh per ton of evaporated water, compared to 70 to 110 kWh required for conventional drying processes. The thermal energy for evaporation was fully covered by solar energy. 相似文献
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简要介绍了污泥的组成及性质,阐述了污泥制备活性炭吸附剂的方法与进展,综述了污泥制备活性炭吸附剂在环境保护中的应用,指出了污泥制备活性炭吸附剂过程中应深入和注意的问题。 相似文献
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《Drying Technology》2013,31(4-5):829-837
ABSTRACT High investments, high dumping costs and high electrical energy consumption turn waste water treatment in small sewage plants an expensive process. Therefore, the University of Hohenheim and the company Thermo-System have developed a fully automatic low temperature solar drying plant allowing further stabilization and volume reduction of sewage sludge by continuous mixing and aerating. To test the potential of the technology, the drying process was investigated in a commercially operated municipal sewage treatment plant with aerobic sludge digestion. During experiments, the changes of the dry solids concentration and the volatile solids, the climatic conditions and the energy consumption were constantly measured and documented. It was found, that the sludge could be dried from a dry solids concentration of 3 to 93% w/w in 64 (flocculated) or 83 days (non-flocculated). At the same time, the volatile solids content was reduced from 65 to 34% w/w, respectively. The electrical energy consumption was only 22 to 28 kWh per ton of evaporated water, compared to 70 to 110 kWh required for conventional drying processes. The thermal energy for evaporation was fully covered by solar energy. 相似文献
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The drying mechanism is important to the drying technology of sewage sludge. Using dynamic electronic balance and image acquisition technique, the paper studies the change of surface configuration and characteristics of moisture transference for three kinds of sewage sludge during drying. In the meantime, the paper also analyses the influence of sludge shape on moisture transference and the change of sludge apparent volume and porosity in the course of drying. 相似文献