Construction Of Environmental Monitoring And Emergency Response System Based On GIS Of NIS

In recent years, with the rapid economic development, environmental pollution accidents have occurred frequently and have brought the serious influence to the ecological environment and people’s lives. For the increasing demand, it is more and more urgent to effectively carry out the environmental monitoring, the environmental pollution assessment and the emergency response to sudden environmental pollution accidents. Industrial enterprises as the main source of environmental pollution and emergency environment accidents, it is needed to establish and improve the environmental monitoring and the emergency response mechanism to sudden environmental pollution accidents in order to prevent the environmental pollution accidents and reduce the harm. Taking NIS as an example, we build an environmental pollution evaluation model to analyze environmental pollution and evaluate the risk of the sudden environmental pollution accidents and build an environmental monitoring and emergency response system based on GIS, which provides the technical support to implement the clean production, promote low-carbon economy and achieve energy-saving emission reduction.The following main conclusions could be drawn from the study:(1) The ecological efficiency of NIS was analyzed by using DEA, the key to achieve ecological enterprise is improving the technology of the energy-saving and emission reduction.(2) The weight of evaluation factors of the environmental pollution in NIS was determined by using AHP in the paper, which ranked in the top three are SO2, NOx and volatile phenol. The evaluation model of the environmental pollution of NIS was constructed combined with Fuzzy Comprehensive Method, which provided the forecast of environment condition.(3) The area for coke oven, blast furnace, converter gas cabinet, the oil depot area for benzene, tar, sulfuric acid and other hazardous chemicals’ storage, and the production area for coking are defined as major danger sources.In addition, the accident source term was analyzed in the study. The leak source intensity of ruptured gas tank and blast cabinet was identified, the leakage of CO was55.7t,61.7t; The leak source intensity of ruptured gas pipeline, the leak rate of CO was14.2kg/s; The leak source intensity of benzene in the scorch system was quality evaporation of benzene, the evaporation rate of benzene was1.5kg/s.(4) The multi-puff model in the change of weather conditions was used to evaluate the unexpected environmental effects of accidents in NIS. The distance range was calculated in the adverse meteorological conditions of that the wind speed was1.5m/s or0.5m/s, F class stability and the downwind axis, while the landing diffusion concentration of CO and benzene achieved within in the standard concentrations.(5) Based on ArcGIS, Delphi, SQL Server, an environmental monitoring and emergency response system of NIS was developed in the paper. The system used the models of environmental pollution and risk assessment to calculate and analyze. The real-time dynamic display through the GIS spatial map can respond rapidly to pollution incidents and generate the contingency plans in the shortest possible time, so it could help to minimize the adverse impact and loss.