共查询到20条相似文献,搜索用时 558 毫秒
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介绍了源于逸度算法的多介质逸度模型。该模型具有结构简单、所需参数少、容易计算、结果表示直观、其计算方法可推广到任意数目的环境介质、预测结果对环境监测和管理具有指导意义等优点。综述了逸度模型的理论基础及近10年的发展与应用情况,并展望了多介质逸度模型的应用前景和发展趋势。 相似文献
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废水中油类的理化性状及含量测定技术 总被引:7,自引:0,他引:7
介绍、验证了三波数红外光谱法测定油类含量、显微镜计数法测定油珠粒径的方法和原理;设计、论证了废水中油类的物化形态分析预处理方案及测定方法。该方法的实测结果对选择除油方法、确定必要的工程设计参数和工艺运行参数、客观评价设施运行效率具有重要的实用价值。 相似文献
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从工程分析和污染防治措施2方面剖析了环境影响评价与工程设计之间的关系,指出环境评应以工程设计为依据,从技术,经济和环境保护的角度对工程项目进行全面地分析,预测和评价,同时对设计中不合理或难以达到环境要求的污染防治措施提出修改意见,即环境影响评价反过来指导工程设计。 相似文献
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对脱硫系统事故工况下急冷装置下游烟气的流场及温度场分布进行了数值模拟研究和分析,并提出了基于原始喷雾系统布置方案的一种优化方案。该方案在能满足设计要求的前提下,最大限度的减少了喷嘴数量和水耗。在事故急冷装置实际工程设计及应用上,具有一定的理论指导意义。 相似文献
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本文介绍了合成氨弛放气中氨回收的两种方法——一段氨吸收法和二段氨吸收法,并详细地介绍了二段氨吸收法回收塔的设计计算。 相似文献
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将高硫高尘选择性催化还原(SCR)工艺应用于钢厂烧结烟气脱硝,分析了硫酸氢铵(ABS)的形成原因、影响因素及常规工艺控制,并提出了应对措施。研究结果表明,NH3、SO3和温度等是影响ABS生成的主要因素。最低连续喷氨温度应高于ABS分解温度且不低于310 ℃,可有效抑制ABS生成。根据数值模拟结果,在高温烟道至反应器入口的弯头处设置导流板可保证氨气均布。采用带前馈信号的串级控制模式调节喷氨量,控制催化剂吹灰器的时间频次,可有效防止催化剂失活和堵灰。工程实践结果显示,脱硝效率不低于94.1%,NOx排放质量浓度不高于36.5 mg/Nm3,符合设计要求。 相似文献
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Werle S 《Waste management (New York, N.Y.)》2012,32(4):753-758
Gasification of sewage sludge can provide clean and effective reburning fuel for combustion applications. The motivation of this work was to define the reburning potential of the sewage sludge gasification gas (syngas). A numerical simulation of the co-combustion process of syngas in a hard coal-fired boiler was done. All calculations were performed using the Chemkin programme and a plug-flow reactor model was used. The calculations were modelled using the GRI-Mech 2.11 mechanism. The highest conversions for nitric oxide (NO) were obtained at temperatures of approximately 1000-1200 K. The combustion of hard coal with sewage sludge-derived syngas reduces NO emissions. The highest reduction efficiency (>90%) was achieved when the molar flow ratio of the syngas was 15%. Calculations show that the analysed syngas can provide better results than advanced reburning (connected with ammonia injection), which is more complicated process. 相似文献
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介绍了有源电力滤波器控制策略,提出了PWM控制技术在电网电压畸变情况下对电网中滤波电流进行连续动态补偿。建立了PWM控制的逆变系统模型并进行仿真研究,结果验证了该控制策略能有效补偿谐波电流。 相似文献
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This paper describes the development of a design chart for the estimation of maximum horizontal displacement within a municipal landfill using the height and the side slope of the landfill. The design chart is based on the results of a finite element parametric study in which the behaviour of the municipal solid waste (MSW) was modeled using a non-linear elastic hyperbolic model. The model input parameters, i.e. non-linear stiffness, shear strength and unit weight of MSW, were obtained from laboratory testing data and an extensive stochastic numerical modelling exercise. Non-linear variations of unit weight as well as Young’s modulus of MSW with depth were incorporated in the finite element analyses. The validity of the design chart was assessed using field monitoring results from a large landfill located in Ontario, Canada. 相似文献
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ASPEN PLUS软件在氨法烟气脱硫模拟中的应用 总被引:3,自引:0,他引:3
运用流程模拟软件ASPEN PLUS模拟了氨法湿式脱硫工艺脱除燃煤烟气中的SO2,介绍了建立模型过程中模块的选取、物性方法的选择、工艺参数的输入以及灵敏度分析,考察了吸收剂浓度、原烟气流量、液气比等工艺参数对脱硫效果的影响。 相似文献
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Leachate recirculation or liquid injection in municipal solid waste landfills offers economic and environmental benefits. The key objective of this study was to carry out numerical evaluation of key design variables for leachate recirculation system consisting of vertical wells. In order to achieve the objective, numerical modeling was carried out using the finite-element model HYDRUS-2D. The following design parameters were evaluated by simulating liquid pressure head on the liner and the wetted width of the waste under steady-state flow conditions: (1) hydraulic conductivities of the waste and vertical well backfill; (2) liquid injection rate and dosing frequency; (3) well diameter, screen height and screen depth; and (4) hydraulic conductivity of the leachate collection system, slope of the leachate collection system and spacing of the leachate collection pipes. The key findings of this study are as follows. The well diameter, hydraulic conductivity of the well drainage pack, and screen height and screen depth of the well have very little effect on the wetted width for a given liquid flux. The wetted width and the injection pressure for a given liquid flux decrease with the increase in the hydraulic conductivity of the waste. The pressure head on the liner increases with the decrease in the vertical distance between the bottom of the well screen and the top of leachate collection system. The liquid injection flux increases with the decrease in hydraulic conductivity of the leachate collection system. Unlike sand (k approximately 10(-4)m/s), pea gravel (k approximately 0.01 m/s) resulted in less than 0.3m pressure head on the liner for all simulations carried out in this study. 相似文献