降低湿法脱硫系统GGH差压的方法与实践

针对台州发电厂脱硫系统在投运初期出现GGH差压高现象,首先简要介绍了湿法脱硫系统的GGH工作原理,结合脱硫系统的运行经验和相关试验进行原因分析和探索归纳得出降低GGH差压的几种方法和对策,并论证了对策实施后的效果,使脱硫系统运行达到最佳的经济性和稳定性。这些控制方法和参数对脱硫系统的正常运行,保证SO2浓度的达标排放将起到积极的作用,可为火电厂湿法脱硫系统高效运行提供理论基础和实践依据。     

不锈钢-气氮板式热沉仿真研究

目的研究不锈钢-气氮板式热沉中,氮气压力、氮气入口流速以及热沉自身流道深度对热沉传热性能的影响。方法利用AnsysFluent软件,对板式热沉壁面温度分布情况以及进出口压力损失进行模拟仿真。结果提高氮气压力和氮气入口速度可以提升热沉的温度均匀性,但热沉进出口压力损失也会增大。对于气氮-板式热沉而言,流道深度的改变对热沉温度均匀性的影响不大,但流道深度较小时,进出口压力损失较大。结论建议在设计气氮-板式热沉时,流道深度选择在8~10 mm,外流程中氮气压力控制在0.3~0.4 MPa,氮气流速控制在20 m/s为宜。     

污水处理厂中全氟化合物的污染研究

为研究全氟化合物在污水厂中的去除效率和环境行为,对泰安市2座污水处理厂进出水中不同链长的全氟磺酸和全氟羧酸的存在与分布进行了采样调查,并分析了全氟辛烷磺酸(PFOS)和全氟辛烷羧酸(PFOA)在采用曝气-A2O工艺的污水处理厂各单位中的浓度变化情况.研究发现,上述污水厂进出水中全氟化合物的污染程度较轻,其中,PFOA、...     

Minimizing leakage from a smelter off-gas system by enhanced control

The off-gas handling system is a vital component of a smelter and it is essential that it operates in accordance with environmental regulations. A key feature of the off-gas management system is maintaining a slightly negative system pressure to prevent gas leakage, such as SO₂, out into the work and external environments. To enhance sustainable development, there is also growing interest in capturing and reusing the significant amount of heat and CO₂ contained within off-gas. The potential incorporation of heat and CO₂ recovery systems places importance on enhancing control to minimize the risk of both gas leakage and disturbance of the smelting process. With these requirements in mind, an easily implementable feedforward control enhancement to existing control schemes is proposed to help provide improved performance.     

Environmental and economic assessment of a greenhouse waste heat exchange

As the economic costs of energy and the negative externalities associated with the combustion of fossil fuels threaten the economic viability of greenhouses in northern climates there is a renewed interest in the use of waste heat. This paper presents a technical and economic methodology to determine the viability of establishing waste heat greenhouses using the waste heat from industrial processes in northern climates. A case study is presented of an exchange between a tomato greenhouse and a flat glass manufacturing plant, which found the waste heat system is significantly more economic to operate than a purely natural gas system.     

团粒喷播在废弃采石场生态恢复方面的应用

废弃采石场严重影响城市周边的生态景观,极易导致生态环境的继续恶化。以文登某一采石场破损山体的绿化工程为例,运用团粒喷播生态修复技术对废弃矿山进行生态性治理,并探讨其生态恢复方法,以期为今后废弃矿山的残损山体植被恢复和生态环境重建提供参考。     

动力与热力抬升对烟气抬升高度的影响分析

通过模式选择和计算,得出烟气抬升高度的增加与动能和热能的关系,表明当烟囱出口处风速分别为3 m/s、2 m/s和1 m/s时欲增加同样大小的烟气抬升高度,需要的动能比热能要高,结论认为烟气的热力提升比动力提升的贡献大。     

将混凝技术应用于大规模污水处理

介绍采用混凝技术大规模处理运河污水时所遇到的一些问题,以及一些生产经验,提出在设施、设备及工艺方面的相应解决办法。强调设备维护、员工技能和管理机制在生产中的重要性,提出科学地进行设备日常维护的方法。通过小试验,提出对东莞运河水污染治理的一点设想,并解释工程中混凝反应需要足够搅拌力度的问题。     

贵州土地复垦发展现状及其对策研究

详细分析了贵州省土地复垦的发展现状以及近年来所做的工作及成效,研究了矿山开采等活动对贵州省土地资源造成的破坏及生态危害,提出了具体的土地复垦的技术措施。为了实现能源、环境、社会、人口和经济的可持续发展,土地复垦是必然选择。     

The effect of greenhouse vegetation coverage and area on the performance of an earth-to-air heat exchanger for heating and cooling modes

The underground temperature at a depth of about 3–4 m is almost constant all the year round. In summer, the underground temperature is lower than the ambient temperature, but in winter it is vice versa. This potentiality is considered for greenhouse cooling and heating by using an earth-to-air heat exchanger (EAHE). This paper considers the effects of two parameters as independent variables including the area of greenhouse and the percentage of vegetation coverage inside the greenhouse on the performance of an EAHE system during both cooling and heating modes. The inside temperature, the thermal energy exchange and the coefficient of performance (COP) of the system were considered as dependent variables. The results showed that both greenhouse area and the percentage of vegetation coverage inside the greenhouse had significant effects on the performance of the EAHE system during both cooling and heating modes. However, the COP of the EAHE system was higher in the cooling mode (4.32) than during the heating mode (1.01). The percentage of vegetation coverage negatively affected the performance of the EAHE system in the cooling mode. However, the performance of the EAHE system improved with the increase in the percentage of vegetation coverage during the heating mode.