山地林火蔓延模型的研究

建立了有风速有坡度条件下的林火蔓延模型,并进行了模拟山丘条件下的数值计算和实验模拟。通过对计算结果和实验结果的分析比较,获得了模拟山地条件下的一些流场变化规律,为进一步预测林火行为为奠定了基础,同时也证明了采用该模型的必要性。     

高校实验室废水的调查评价及清洁生产管理

本文通过对四川大学教学计划中实验课程及其排放废水中一类污染物和选课人数的统计,对实验室废水排放情况进行了统计分析评价,找出了主要污染物.并提出了将清洁生产模式运用于实验室废水管理的思路.     

The Politics of Waste Incineration in Beijing: The Limits of a Top-Down Approach?

The siting of waste incinerators is often a highly contentious issue. Although most studies have focused on Western countries, municipal solid waste management has become an extremely pressing issue in China. Incineration is being strongly promoted by government officials, yet this has resulted in strong societal opposition. Through documentary analysis and in-depth stakeholder interviews, this article analyses three anti-incineration campaigns in Beijing, focusing on outcomes and campaigner strategies. Anti-incineration campaigns have partly undermined the government's top-down, non-consultative approach to waste management. In developing an ‘expert strategy’, campaigners have exploited government weakness whilst depoliticizing the issue. Yet rather than lead to a more open and consultative incineration policy, it is more likely that officials will circumvent unrest through increasing opacity and by choosing sites in locations where opposition is less likely to emerge.     

石灰石湿法烟气脱硫试验研究

介绍了湍球塔石灰石湿法烟气脱硫系统，通过试验，研究分析了床层阻力，脱硫效率，ＣａＣＯ３利用率等因素，试验证明烟气脱硫的效率可达５０％￣８５％，是一种简易的烟气脱硫方法。     

Cleaner red mud residue production at an alumina plant by applying experimental design techniques in the filtration stage

Red mud is a residue obtained by the Bayer process during alumina production, and its disposal is an environmental problem due to its caustic nature, metal and radionuclide content and alkalinity. The present study analyzed five different filtration factors with two levels each in order to improve filtration and, thus, reduce the caustic content of this residue. This study was conducted at the Alumina do Norte do Brasil S.A (ALUNORTE) alumina plant, located in Pará, Brazil, in one of the six filters at the plant. Results show that the condensate is the primary factor in caustic red mud concentrations, followed by dilution, rotation and level of the basin filter. The interactions between dilution and the level of the basin filter were considered significant, as was the interaction amongst the three effects: dilution, level of the basin filter and vacuum. The model adjustment regarding the filtration process allows for the production of a final red mud product with lower caustic concentrations, resulting in economic advantages due to higher caustic recovery in filtration and lower caustic concentration in the red mud residue, which leads to an environmentally safer residue.     

Experimental study of new solar air heater design

The suitable design is the most important key to a cost-effective solar air heater. Although there are many techniques that have been proposed to improve the solar air heaters’ performance by means of different turbulence promoters, they cannot ensure a compromise between the cost and the effectiveness. The aim of this study is to find simple and tolerable solution to get rid of the inconvenience resulting from the widely adopted heat-transfer-enhancement techniques by providing an optimized solar air heater design. The proposed design consists of a slightly curved smooth flow channel with an absorber plate of convex shape. A prototype of a curved solar air heater of 1.28 m² collector area was built and tested under summer outdoor conditions in Biskra (Algeria). The performance was evaluated in terms of thermal and effective efficiency for mass flow rates of 0.0172, 0.029, and 0.0472 kg/sm². It is observed that the overall efficiency of this solar air heater is considerably higher in comparison with the efficiency range of the conventional smooth flat plate heaters reported in the literature for similar operating conditions.     

Influence of the operation conditions on CO2 capture by CaO-derived sorbents prepared from synthetic CaCO3

In this work, a statistical experimental design is performed in order to prepare CaCO₃ materials for use as CaO-based CO₂ sorbent precursors. The influence of different operational parameters such as synthesis temperature (ST), stirring rate (SR) and surfactant percent (SP) on CO₂ capture is studied by applying Response Surface Methodology (RSM). The samples were characterized using different analytical techniques including X-ray diffraction, N₂ adsorption isotherm analysis and Scanning Electron Microscopy–X-ray Energy Dispersive Spectroscopy (SEM-EDX). CO₂ capture capacity was determined by means of a thermogravimetric analyzer which recorded the mass uptake of the samples when these were exposed to a gas stream containing diluted (15%) CO₂. The statistical approach used in this work provides a rapid way of predicting and optimizing the main preparation variables of CaO-derived sorbents for CO₂ sorption. The results obtained clearly indicate that four parameters statistically influence CO₂ uptake: SR, the square of SR, its interaction with SP and the square of SP.     

细水雾灭火技术的研究

细水雾灭火技术主要通过汽化隔氧、冷却燃料和氧化剂以及吸收部分热辐射等效应与火相互作用,降低燃烧化学反应速率和火焰传播速率,达到控制和扑灭火灾的目的,不会产生“二次性环境污染”,可以达到火灾防治洁净化目标。为此,对细水雾抑制火灾的过程和机理进行了实验研究和数值模拟,以促进细水雾灭火技术的发展     

贮油罐区防火水幕模拟实验研究

本文通过对贮油罐区防火水幕冷态和模拟实验数据的分析比较,讨论了设计防火隔热水幕的形式方式,水幕喷头的结构选型等重要参数。     

城市污水厂污泥间壁热干燥过程实验研究

分析污水厂污泥间壁热干燥过程的影响因素 ,并确定过程的关键设计参数。研究以间隔实验为基本手段 ,并进行了污泥间壁热干燥过程数学模型的推导。认为 :壁温和泥层厚度是过程的主要影响因素 ,由实验数据确定的过程比总传热系数 K是设计的关键参数 ,在适宜条件 :壁温 16 0℃ ,泥层厚度 1.0 cm时 ,其值为 6 5 .6 (k J/ m2·℃· h)