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( Shigetoshi Takahashi ),( In-hee Hwang ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Fabric filter is widely used as typical dust collection equipment in the waste incineration facilities. On the other hand, the pressure drop in the fabric filter occupies a large amount of energy loss of the flue gas treatment system. Meanwhile, the repetitive reduction of the pressure drop in bag house was reported by spraying phosphoric acid wastewater (PAW) into incinerator. The decrease of pressure drop on fabric filter is important because it is deeply related to saving of energy consumption in waste incineration plants. In this study, the operating data of incineration plant was analyzed to investigate the short-term and long-term effect on pressure drop by spraying PAW. As the short-term effect of PAW spray, the total reduction of pressure drop of fabric filter was always decreased but it was not proportional to the amount of phosphorus into the incinerator. There was no clear correlation between the total reduction of the pressure drop and the utilization period of fabric filters. The total reduction of pressure drop was range from 0.3 to 1.2 kPa regardless the utilization period of fabric filters. On the other hand, as the long- term effect of PAW spray, nevertheless the pressure drop rarely increased without spraying PAW, the pressure drop showed a gradual increase trend at the normal operating period after finishing spraying PAW. Especially it was remarkable that the pressure drop increased at the spraying PAW just after the replacement of all fabric filters. These results suggest that the spraying PAW produces the reduction of pressure drop in the short-term but leads to the increase of pressure drop increase and makes the operating condition worse from the long-term viewpoint.
( Wataru Sudo ),( In-hee Hwang ),( Shigetoshi Takahashi ),( Toshihiko Matsuto ),( Masaaki Kurata ),( Norio Maeda ),( Yoshitada Kakuta ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Fabric filter is one of representative particulate matter collection device for flue gas treatment. Particulate matter captured on the fabric filter forms layer but it causes a pressure drop. It was reported that pressure drop of bag house had decreased significantly when wastewater including phosphoric acid was sprayed to incinerate. Phosphoric acid in wastewater was considered to influence the decrease of pressure drop in bag house. In this work, a bench scale of experimental apparatus simulating fabric filter was prepared to reveal the effect of phosphoric acid spray on pressure drop of fabric filter and physical property of fly ash as well. Pressure drop of fabric filter, the amount of fly ash discharged by pulse jet, air permeability coefficient of fly ash layer on fabric filter, and particle size distribution and circularity of fly ash were measured under the experiments of spraying different concentration of phosphoric acid solution to fabric filter. As the results, it was found that the increase of pressure drop was suppressed when phosphoric acid was sprayed by 3wt% as the weight ratio of phosphorus to fly ash. From the increases of air permeability coefficient of fly ash layer on fabric filter and of particle fraction > 200 μm with low circularity, the increase of pressure drop seemed to be suppressed by the change of physical property of fly ash. However, the effect of phosphoric acid spray on pressure drop of fabric filter was reduced as it continued for a long time. For the effective use of phosphoric acid solution, the intermittent spray method should be investigated in further study.
( Takuya Hosokawa ),( In-hee Hwang ),( Shigetoshi Takahashi ),( Takayuki Matsuo ),( Toshihiko Matsuto ),( Masaaki Kurata ),( Norio Maeda ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
Fabric filter is a representative dust collection device for flue gas treatment in solid waste incinerator. Particulate matter in flue gas is collected on the outside of fabric bags and is periodically dislodged by a pulse of compressed air. Built-up dust layer on the fabric can be a medium to remove smaller size particle but it brings about an increase of pressure loss in fabric filter. In general, the pressure loss caused by dust layer on fabric filter is known to occupy more than half of total pressure loss for the operation of incineration system. The increase of pressure loss leads to the increase of electric consumption of induced draft fan (IDF) to keep a negative pressure in the incinerator. Thus, the control of pressure loss of fabric filter is important to operate incinerate on system. Under this circumstance, one incineration facility reported that pressure loss of fabric filter became lower when wastewater including phosphoric acid was sprayed to furnace for incineration. Phosphoric acid in wastewater was considered to influence the decrease of pressure drop in bag house. In this work, a laboratory scale of experimental apparatus simulating a fabric filter was prepared to reveal the effect of phosphoric acid spray on pressure drop of fabric filter and physico-chemical property of fly ash as well. 7.5 g of fly ash was supplied to the filter by a micro-feeder. Phosphoric acid solution was sprayed by adjusting that the weight ratio of phosphorus became 0~10wt% of fly ash. Variation of pressure drop at the filter, arithmetic average roughness of ash layer on the filter cloth, and particle size distribution and circularity of fly ash were measured under the experiments of spraying different concentration of phosphoric acid solution to the filter cloth. In addition, the form of phosphorus compound in fly ash was analyzed using X-ray diffractometer (XRD, Rigaku Co., Ltd). XRD peaks were identified by Match!2 of software for diffraction peak analysis. As the results, it was found that the increase of pressure drop per unit weight of ash was suppressed when phosphoric acid was sprayed by 2~3wt% as the weight ratio of phosphorus to fly ash. Particle size of fly ash was increased by spraying phosphoric acid. On the other hand, there were no significant changes on arithmetic average roughness at the surface of ash layer and circularity of fly ash with or without spraying phosphoric acid. Calcium hydroxide and calcium hydroxide chloride decreased in fly ash whereas dibasic calcium phosphate was produced in fly ash by spraying phosphoric acid. It indicates that phosphoric acid might consume calcium hydroxide as well as reaction products of calcium hydroxide and hydrogen chloride in fly ash. Thus, the excessive amount of phosphoric acid spray will have a bed influence on flue gas treatment. Considering the effect of pressure loss decrease in fabric filter, the influence on flue gas treatment, and operating cost, phosphoric acid should be sprayed by 2~3wt% as the weight ratio of phosphorus to fly ash.