The corrosion condition of flue gas desulfurization (FGD) equipment for the coal-fired power plant was defined as the strong corrosion grade. The lining system of hybrid polymer composite was used in internal cylinder...The corrosion condition of flue gas desulfurization (FGD) equipment for the coal-fired power plant was defined as the strong corrosion grade. The lining system of hybrid polymer composite was used in internal cylinder of steel chimney, and a corrosion-resistant and heat-resistant protective layer was formed on the metal surface. The corrosion-resistant and ageing-resistant properties of hybrid polymer composite prepared at low temperature after four years of practical use were investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM) and measurement of gravimetric variation, contact angle, abrasion resistance, bonding strength and tensile strength. The properties of hybrid polymer composites prepared at 25℃ and –15℃ were comparatively analyzed in the paper.展开更多
随着我国环保标准日益严格,很多燃煤电厂静电除尘器已不能满足排放标准的要求,需进行改造。该文首先分析了造成静电除尘器除尘效率低下的主要原因;提出3种改造方案:增加电场;改造为袋式除尘器;改造为静电袋式复合除尘器。并从技术性能...随着我国环保标准日益严格,很多燃煤电厂静电除尘器已不能满足排放标准的要求,需进行改造。该文首先分析了造成静电除尘器除尘效率低下的主要原因;提出3种改造方案:增加电场;改造为袋式除尘器;改造为静电袋式复合除尘器。并从技术性能和经济性2个方面对3种改造方案进行了比较,以郑州热电厂200 M W机组静电除尘器改造为例对3种方案进行了对比分析,结果表明:改造为静电袋式复合除尘器的方案是静电除尘器改造的最佳方案,并认为静电袋式复合除尘是我国除尘技术未来的发展方向之一。展开更多
Elemental mercury(Hg0) is predominant constituent of flue gas emitted from coal-fired power plants. Adsorption has been considered the best available technology for removal of Hg0 from flue gas. However, adsorbent inj...Elemental mercury(Hg0) is predominant constituent of flue gas emitted from coal-fired power plants. Adsorption has been considered the best available technology for removal of Hg0 from flue gas. However, adsorbent injection increases the amount of ash generated. In the present study, powdered activated carbon(PAC) was coated on polytetrafluoroethylene/glass fiber filters to increase Hg0 removal while concurrently reducing the amount of ash generated. The optimal PAC coating rate was determined in laboratory experiments to ensure better Hg0 removal with low pressure drop. When PAC of particle size less than 45 μm was used, and the areal density was 50 g/m2, the pressure drop remained under 30 Pa while the Hg0 removal efficiency increased to 15.8% from4.3%. The Hg0 removal efficiency also increased with decrease in filtration velocity. The optimal PAC coating rate was applied on a hybrid filter(HF), which was combined with a bag filter and an electrostatic precipitator in a single chamber. Originally designed to remove fine particulates matter, it was retrofitted to the flue gas control device for simultaneous Hg0 removal. By employing the PAC coating, the Hg removal efficiency of the HF increased to 79.79% from 66.35%. Also, a temporary reduction in Hg removal was seen but this was resolved following a cleaning cycle in which the dust layer was removed.展开更多
文摘The corrosion condition of flue gas desulfurization (FGD) equipment for the coal-fired power plant was defined as the strong corrosion grade. The lining system of hybrid polymer composite was used in internal cylinder of steel chimney, and a corrosion-resistant and heat-resistant protective layer was formed on the metal surface. The corrosion-resistant and ageing-resistant properties of hybrid polymer composite prepared at low temperature after four years of practical use were investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM) and measurement of gravimetric variation, contact angle, abrasion resistance, bonding strength and tensile strength. The properties of hybrid polymer composites prepared at 25℃ and –15℃ were comparatively analyzed in the paper.
文摘随着我国环保标准日益严格,很多燃煤电厂静电除尘器已不能满足排放标准的要求,需进行改造。该文首先分析了造成静电除尘器除尘效率低下的主要原因;提出3种改造方案:增加电场;改造为袋式除尘器;改造为静电袋式复合除尘器。并从技术性能和经济性2个方面对3种改造方案进行了比较,以郑州热电厂200 M W机组静电除尘器改造为例对3种方案进行了对比分析,结果表明:改造为静电袋式复合除尘器的方案是静电除尘器改造的最佳方案,并认为静电袋式复合除尘是我国除尘技术未来的发展方向之一。
基金supported by the Korea Ministry of Environment as "The Eco-Innovation Project" (2013000110002)"The Environmental Health Action Program"(2015001370001)"Knowledge-based Environmental Service (Waste to Energy and Recycling) Human Resource Development Project"
文摘Elemental mercury(Hg0) is predominant constituent of flue gas emitted from coal-fired power plants. Adsorption has been considered the best available technology for removal of Hg0 from flue gas. However, adsorbent injection increases the amount of ash generated. In the present study, powdered activated carbon(PAC) was coated on polytetrafluoroethylene/glass fiber filters to increase Hg0 removal while concurrently reducing the amount of ash generated. The optimal PAC coating rate was determined in laboratory experiments to ensure better Hg0 removal with low pressure drop. When PAC of particle size less than 45 μm was used, and the areal density was 50 g/m2, the pressure drop remained under 30 Pa while the Hg0 removal efficiency increased to 15.8% from4.3%. The Hg0 removal efficiency also increased with decrease in filtration velocity. The optimal PAC coating rate was applied on a hybrid filter(HF), which was combined with a bag filter and an electrostatic precipitator in a single chamber. Originally designed to remove fine particulates matter, it was retrofitted to the flue gas control device for simultaneous Hg0 removal. By employing the PAC coating, the Hg removal efficiency of the HF increased to 79.79% from 66.35%. Also, a temporary reduction in Hg removal was seen but this was resolved following a cleaning cycle in which the dust layer was removed.
