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target="_blank">煤改?/a>”是否会缓解大气污染?这一措施会带来哪些影响?记者近日就上述问题进行了调查采访?</p> <p> <br /> </p> <p> 问题一?</p> <p> <br /> </p> <p> 对燃气热电联产机组认识有误区 </p> <p> <br /> </p> <p> 人们普遍认为天然气是清洁能源,作为热电联产机组可以比燃煤机组更加节能环保,减少污染气体排放,减轻雾霾天气。不过,清华大学热能工程系教授、中国工程院院士倪维斗却认为,“盲目进行热电联产‘煤改气’,用燃气热电联产替代燃煤热电联产并不能真正缓解大气污染。?</p> <p> <br /> </p> <p> 倪维斗分析指出,造成大气灰霾的主要原因是PM2.5,而PM2.5包括一次颗粒物和二次颗粒物。其中一次颗粒物由工业、建筑,交通、电力、其它生产和生活活动以及天然源排放,二次颗粒物由NOx等气体向颗粒物转化生成,其中主要气体为NOx,它在阳光紫外线的作用下能立即发生大量的光化学反应生成臭氧和大量各种自由基,使大气的氧化性大大增强。同时,强氧化性的自由基将一次气态污染物转化成二次细颗粒物?</p> <p> <br /> </p> <p> “二次颗粒物的组分约占PM2.5?0%?0%,而NOx导致大气氧化性增强,形成大量二次颗粒物,是大气灰霾的元凶。”倪维斗表示?</p> <p> <br /> </p> <p> 而倪维斗院士提供的测算数据显示,较之燃煤热电联产机组,燃气热电联产机组NOx排放量比燃煤热电联产机组更大?</p> <p> <br /> </p> <p> 倪维斗举例说,同样以供热面积?亿平方米计,如果使用燃气热电联产机组,采暖期燃料消耗量?4.4亿立方米天然气,总排放NOx量为0.7万吨(国标);如果使用基于吸收式换热的燃煤热电联产机组,采暖期燃料消耗量?60万吨标煤,总排放NOx量为0.5万吨;如果使用基于上海外高桥第三电厂、吸收式换热技术的燃煤热电联产机组,采暖期燃料消耗量?53万吨标煤,总排放NOx量仅?.09万吨?</p> <p> <br /> </p> <p> 对此,倪维斗向记者解释说,“热电联产时,燃气热电联产热电比更小,也就是发电量大,为得到同样的热量,燃气热电联产需燃烧更多的燃料,导致燃气热电联产NOx排放量比燃煤热电联产更多。同时,为保证发电效率,需要高温燃烧,这也会产生大量NOx。?</p> <p> <br /> </p> <p> 事实上,经过多年科技创新和实践探索,我国燃煤电厂的污染控制水平和能源利用效率已经达到较高水平,如上海外高桥第三发电厂发电煤耗为275g/千瓦时,SO2、NOx、粉尘排放量分别?.47kg/tce?.37kg/tce?.12kg/tce,均远高于国家相关环保标准,部分指标甚至优于燃气发电机组。相关研究报告则显示,燃煤污染主要来自于钢铁、小锅炉、小窑炉以及民用燃煤等散烧利用方式?</p> <p> <br /> </p> <p> “尽管就一个电厂来说燃煤供热电厂比天然气供热相比排放量要大一些,但从全社会来看,天然气一定量的前提下,用于替代散烧的煤炭比替代燃煤供热具有更好的环境效益和经济效益。”中电联相关负责人告诉本报记者,“而且只要是环境保护需要,燃煤电厂也可以做到与天然气发电污染排放水平相当。?</p></p></div> <h3 class="tag">相关标签?a href='/key.aspx?k=%c3%ba%b8%c4%c6%f8'>煤改?/a>,</h3> <div class="page"><div>上一?<a href="29.html">专业四川商用厨房设备厂家教你如何设计好厨房通道</a></div> <div>下一?<a href="27.html">我国“煤改气”若干重要问题再讨论</a></div> </div> </div> <div class="relate_list"> <div class="relateproduct relate"><h4>相关产品?/h4> <div class="content"> <ul id="relate_p" class="product_list clearfix"> <li> <a href="http://www.hainanxinwen.com/supply/247.html" title="煤改气工? class="img" rel="nofollow"> <img 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