燃气锅炉房调峰供热的大气环境影响模拟

Atmospheric Environmental Impact Simulation of Gas Fired Boilers as Peak Load Heat-Sources

燃气供热可以减少污染物的排放,逐渐成为一种新的调峰热源。为研究燃气锅炉房作为调峰热源的大气环境影响,采用改进的环境影响评价导则模型模拟了一个新建联合供热系统在集中与分散调峰下的污染物分布。改进模型对长期平均浓度的模拟采用了风向加密算法,并绘出相应的平面浓度分布以供比较。模拟结果说明系统的大气环境影响不仅与单位供热量的污染物排放有关,还与热源在热网中的分布有关。集中调峰具有相对较小的环境影响;对于分散调峰,若燃气锅炉房设置越集中,则系统的大气环境影响就越大;此外还从环境影响的角度分析得出燃气锅炉的最佳设置比例应在0.2至0.6之间。

Heating with gas can reduce air pollutant emission and therefore becomes a new sort of peak load heat-source. To study the atmospheric environmental impact, we adopted a newly built combined heating system and simulated its pollutant dispersion for centralized and distributed peak heating. The simulations were based on the improved regulatory environmental impact assessment （EIA） guidelines for atmospheric environment. The model developed an algorithm for infill-wind-direction simulation and exported pollutant contours for comparisons. Simulation results show that the system＇s atmospheric environmental impact is related not only to the pollution emission quantity per quantifieational heating, but also to the distribution of heat resource in the gas fired boilers. The centralized peak heating has comparatively small environmental impact; for distributed peak heating, the more concentration of gas fired boilers distribution is applied, the more serious environmental impact will be. In addition, the optimum setting proportion of gas fired boilers should be between 0.2 and 0.6 from the perspective of environmental impact.