摘要：

      从2015-2016学年开始，波士顿公立学校11%的校车使用青鸟丙烷液化石油气巴士。学校共购买了86辆青鸟丙烷校车,并希望在未来将有更多的丙烷校车替代柴油校车。
       和很多城市一样,波士顿已经公布了减少尾气排放的命令。学校是城市最大的柴油用户。在过去的15年里，通过“波士顿公立学校绿化”项目已经颁布了一系列减排措施。丙烷液化石油气校车因其效率高而污染小成为校车的优先选择。
      新的巴士,由福特V10引擎提供能量,每个都配备ROUSH CleanTech丙烷液化石油气燃料系统。与传统的柴油巴士相比，液化石油气校车将使每年氮氧化物排放量低于66000磅，颗粒物排放低于2700磅。与传统的柴油相比，丙烷液化石油气车辆将减少80%碳氢化合物排放以及零颗粒物排放。
      根据波士顿城市路线的特殊需要，为了使短距离内更好的工作，汽车设计了169英寸的轴距以及50加仑的储罐。这个新的液化石油气公交公司提供了更多的青鸟丙烷液化石油气产品,其中还包括标准的70加仑和100加仑的增程型液化石油气储罐。

      学校希望使用了丙烷液化石油气清洁燃料后，每加仑燃料可节省至1美元以及更低的维护成本。波士顿公立学校已与公司签订使用丙烷液化石油气车辆的合同。并将于6月份接收到公交车。

Boston Public Schools will operate 11% of its bus fleet with Blue Bird propane autogas buses, starting with the 2015-2016 school year. The school district is purchasing 86 Blue Bird Propane Vision school buses, and hopes to convert more of their diesel fleet to propane buses in the future.

Like many urban cities, Boston has implemented mandates for reducing tailpipe emissions. The school district, already the city’s largest user of diesel fuel, has enacted a number of emissions-reducing initiatives in the past 15 years through its “Greening Boston Public Schools” program. School buses fueled by propane autogas fit with their mission to choose vehicles with the highest efficiency and the lowest environmental emissions, according to Peter Crossan, fleet and compliance manager of Boston Public Schools.

The new buses, powered by a Ford V10 engine, each come equipped with a ROUSH CleanTech propane autogas fuel system. The district’s autogas fleet will emit 66,000 fewer pounds of nitrogen oxide and 2,700 fewer pounds of particulate matter each year, when compared to the diesel buses they are replacing. Vehicles fueled by propane autogas emit 80% less smog-producing hydrocarbons and virtually eliminate particulate matter when compared to conventional diesel.

Boston Public Schools started exploring alternative fuels once the city’s outdated tunnel restrictions were lifted. About 40% of its fleet consists of 169-inch wheelbase buses. This smaller bus size meets the district’s need related to range and hours of service, which averages almost twice the national average on a daily basis, according to Crossan.

The 169-inch wheelbase bus is designed with a 50-gallon sized tank to accommodate shorter runs, and works well for Boston’s urban routes and special needs applications. This new autogas bus offering expands Blue Bird’s propane autogas portfolio, which also includes the 70-gallon standard and 100-gallon extended-range autogas tanks.

The school district also expects to save at least $1 per gallon on fuel as well as lower maintenance costs due to the cleaner burning properties of propane autogas.

To fuel the buses, Boston Public Schools has contracted with a company that performs on-site propane autogas fleet fueling services.

The school district will take delivery of the buses in June.

来源：greencar  congress