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Environmental Radiation of Coal and Its By-products in the Coal-fired Power Plants, Xi’an

Author: WangFengLing
Tutor: LuXinWei
School: Shaanxi Normal University
Course: Quaternary Geology
Keywords: Coal Natural radionuclides Environmental Radiation Coal-fired power plants Xi'an
CLC: X837
Type: Master's thesis
Year: 2008
Downloads: 152
Quote: 2
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Abstract


The coal is to make a significant contribution to the socio-economic development has also brought serious environmental pollution problems. Radionuclides in the coal combustion process, coal ash and cinder residual enrichment, in turn, with the ash, the ash into the surrounding soil, affecting soil radioactivity levels. Shaanxi province is rich in coal resources, coal-fired power plants, coal-fired solid waste emissions from large coal-fired power plant of solid wastes and the environmental effects of radiation research is extremely lacking. This study has important theoretical and practical significance in radiation monitoring and protection. Xi'an two major coal-fired power plant (of Baqiao and the western suburbs Thermal Power Plant), application of low background gamma spectrometry analysis of raw coal of the coal-fired power plants, coal ash, slag and power plants, ash storage field surrounding soil in radionuclide content to understand the characteristics of migration and concentration of radionuclides in the coal combustion process, coal-fired power plants on the environment effects of radiation, as well as power plant solid waste building materials used in radiation exposure. The research results show that the lower western suburbs and Baqiao power plants surrounding soil background, in the process of long-term production release due to fly ash deposition, radionuclide 226 Ra was a significant increase in the power plants surrounding soil surface The ash storage field is more obvious effects of radiation on the surrounding environment. Western suburbs and Baqiao of fly ash and use of the process, you should pay attention to the additional radiation to prevent the health of residents affected. The main conclusions of this paper are as follows: 1. In the western suburbs of Thermal Power Plant raw coal 226 Ra average content of 16.2 Bq / kg, 232 Th average content of 28.0 Bq / kg 40 K average content of 49.6 Bq / kg. The ash (western suburbs of thermal power plants) 226 the Ra The average content of 59.2 Bq / kg, 232 Th average content of 72 Bq / kg, 40 K average content of 250.1 Bq / kg. The slag (western suburbs of thermal power plants) 226 Ra average content of 53.5 Bq / kg, 232 Th average content of 49.7 Bq / kg, 40 K average content of 214.4 Bq / kg. The ash (western suburbs of thermal power plants) 226 Ra content was 3.7 times that of raw coal, 232 Th content was 2.6 times that of raw coal, 40 K content was 5.0 times that of the raw coal; 226 Ra content of raw coal of 3.3 times (western suburbs of thermal power plants) slag 232 Th content of the raw coal 1.8 times, 40 K content was 4.3 times that of raw coal. The 226 ash in natural radionuclides of (western suburbs of thermal power plants) Ra enrichment 0.725 232 Th enrichment to 0.881. The slag (western suburbs of thermal power plants) the for 226 Ra enrichment of 0.761 232 Th enrichment to 0.707. Xijiao power plant is extensive use of coal ash as a building material, will result in the building indoor air absorbed dose rate to increase to 0.458 × 10 -8 Gy / h; permanent residence in the western suburbs of power plant ash building materials, housing, the inhabitants of the annual effective dose equivalent of 0.074 mSv. 2. Within 1 km of the western suburbs of thermal power plants, the topsoil 226 Ra content of an average of 31.46 Bq / kg, B and C layer 226 Ra average content of 24 .85 Bq / kg and 25.70 Bq / kg soil 226 Ra background of 25 ± 1 Bq / kg; 232 Th and 40 K content close to the average content of soil and Shaanxi Province. Power plant around the soil 1m height air γ average dose rate of 56.4 nGyh -1 ; the equivalent radium concentration of power plants around the soil surface average to 128.74 Bq / kg. Terrestrial γ radiation of natural radionuclides in the soil of the western suburbs of the plant, the surrounding residents annual effective dose equivalent of 0.550 mSv. 3. Baqiao Thermal Power Plant raw coal 226 Ra average content of 36.56 Bq / kg 232 Th average content of 36.08 Bq / kg 40 K average content of 88.55 Bq / kg, is low compared the Baqiao power plant natural radionuclide content of raw coal with the national average content. The Baqiao Thermal Power Plant ash 226 Ra average content of 55.18 Bq / kg 232 Th average content of 65.15 Bq / kg 40 The average content of K to 242.84 Bq / kg. The ash (Baqiao Thermal Power Plant) 226 Ra content was 1.5 times that of raw coal, 232 Th content was 1.8 times that of raw coal, 40 K content was 2.74 times that of raw coal. (Baqiao Thermal Power Plant) ash 226 Ra enrichment of 0.550 232 Th enrichment to 0.658. Use of the Baqiao fly ash as a building material, will result in the building indoor air absorbed dose rate to increase to 0.423 × 10 -8 Gy / h, the Baqiao of fly ash and building materials to the residents bring The annual effective dose equivalent of 0.060 mSv. 4. Baqiao Thermal Power Plant 1 km radius around the topsoil 226 Ra content of an average of 36.57 Bq / kg; the plant, soil 226 Ra background of 26 ± The The 1 Bq / kg, lower than the soil of Shaanxi Province 226 Ra average content 232 the Th and 40 K content and soil content of Shaanxi Province close . The Baqiao power plants surrounding soil average of 1m height air gamma dose rate 58.3 nGyh -1 , the equivalent radium concentration of power plant topsoil around an average of 133.82 Bq / kg, terrestrial γ radiation surrounding residents, the annual effective dose equivalent of 0.552 mSv. 5. 1 km radius around Baqiao thermal power plant ash storage field, topsoil 226 Ra content of an average of 42.83 Bq / kg; the ash storage field surrounding soil 226 Ra this bottom for 26 ± 1 Bq / kg, lower than the soil of Shaanxi Province 226 Ra average content; soil samples 232 Th average content of Shaanxi soil were lower than the average; < sup> 40 K content ranges for 200.83-673.16 Bq / Kg. The ash storage field surrounding soil 1m height air gamma mean dose rate of 58.8 nGyh -1 , the equivalent radium concentration of the average of the the ash storage field surrounding topsoil 136.70 Bq / kg, ash storage field The annual effective dose equivalent of the surrounding terrestrial gamma radiation on the surrounding residents was 0.553 mSv.

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring > Radioactive pollution,electromagnetic pollution monitoring
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