久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

Natural gas-use increase raises concern

Updated: 2013-11-17 07:03

By Zheng Xin(China Daily)

  Print Mail Large Medium  Small

Experts are voicing worries over plans to reduce coal combustion by using more natural gas as the heating season approaches.

The large number of coal power plants being refitted as gas power plants will increase nitric oxide emissions, Chinese Academy of Engineering academician Ni Weidou said.

"Natural gas should be used rationally, and coal-to-gas projects should be implemented cautiously," Ni said.

"Otherwise, more nitric dioxide will be discharged and pollute the air."

Ni made the remark at an international forum on air quality management in Beijing organized by the Energy Foundation on Saturday.

Coal's proportion of the energy mix should not exceed 65 percent by 2017, when clean coal should account for at least 70 percent of total coal use. The clean coal proportion is around 80 to 90 percent in most developed countries.

The country will by then also have added more than 150 million cubic meters worth of natural gas pipeline-transportation capacity.

Ni said advanced technology enables clean coal to produce very low emissions. Nitric dioxide emissions are lower from all grades of coal compared with natural gas, he said.

"Considering more fuel is combusted in gas-fired combined heat and power boilers in order to get the same amount of heat, the nitric oxide emission is larger than that from coal-fired ones," he said.

Ni said the total emission of nitric dioxide will increase and the air quality will worsen if the four coal power plants in downtown Beijing are transformed into gas-fired CHP while contributing the same amount of heat.

Feng Yongfeng, founder of the Beijing-based environmental NGO Green Beagle, is also concerned about the burden placed on other cities to ensure Beijing's gas supply.

"The use of clean energy might burden neighboring provinces and regions, and the government should not be unrealistically optimistic about the project," Feng said.

Also, upgrading coal power plants into natural gas plants is expensive, and there has not yet been a detailed disclosure of the nationwide cost.

"The government should think about the input-output ratio and see if the solution works best under the current circumstances to decide whether natural gas or clean coal is better," Feng said.

The capital's coal combustion-reduction plan, which aims to replace coal with natural gas in all downtown areas, has received 1.3 billion yuan ($213 million) in investment. It is expected to cut coal consumption by 600,000 tons a year, sulfur dioxide by 1,680 tons, and smoke and dust by 1,392 tons, the Beijing Environmental Protection Bureau has reported.

Municipal government figures show coal accounts for 16.7 percent of PM2.5, which is too small for the respiratory system to filter.

Another challenge is the shortage of natural gas.

"The coal-to-gas conversion project currently carried out in many northern cities could cause serious natural gas supply shortages," Ni said.

"The target of coal-to-gas should be focused on maximum emission reduction."

Ni worried this winter will witness a worse imbalance between supply and demand of natural gas in China compared with recent years.

China's natural gas shortage is about 8 billion cu m. Natural gas accounts for more than 30 percent of developed countries' energy mixes but only 5 percent of China's.

Beijing environmental protection bureau deputy director Liu Wei told China Daily in a previous interview that the capital has enough natural gas for this winter because of transfers from the Inner Mongolia autonomous region, the Xinjiang Uygur autonomous region, and Shaanxi and Hebei provinces.

But while experts highlighted potential problems with increasing natural gas use, they also pointed to its boons.

"Replacing some small industrial boilers with CHP models will improve evident pollutant emission reduction," China Academy of Engineering academician Hao Jiming said.

If the new 150 million cu m of natural gas supply replaced some coal-burning industrial boilers, it is expected that would reduce sulfur dioxide by more than 3.59 million tons and smoke by more than 1.34 million tons, he said.

zhengxin@chinadaily.com.cn.

(China Daily 11/17/2013 page2)

久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    色综合天天综合色综合av| 欧美区视频在线观看| 亚洲欧洲日韩女同| 91久久精品一区二区三区| 午夜电影网亚洲视频| 日韩精品一区二区三区在线| 国产成人综合在线| 亚洲精品免费看| 欧美一区二区三区喷汁尤物| 国产一区91精品张津瑜| 成人欧美一区二区三区白人| 精品视频免费看| 精品在线播放免费| 中文字幕一区二区日韩精品绯色| 欧美三级乱人伦电影| 久久国产综合精品| 亚洲欧洲成人自拍| 在线播放欧美女士性生活| 国产剧情一区二区三区| 亚洲六月丁香色婷婷综合久久 | 91丝袜美腿高跟国产极品老师| 亚洲国产精品视频| 久久久综合精品| 欧美在线一区二区三区| 国产综合一区二区| 亚洲精品v日韩精品| 精品毛片乱码1区2区3区| 91网站最新网址| 久久精工是国产品牌吗| 亚洲欧美激情小说另类| 日韩精品一区二区三区视频在线观看 | 日韩女同互慰一区二区| www.欧美日韩| 免费看日韩a级影片| 亚洲欧洲日产国产综合网| 91精品国产91久久综合桃花| 成人国产精品免费观看动漫| 日本不卡视频在线| 亚洲毛片av在线| 久久久久久久久久美女| 精品视频免费在线| 不卡的av在线| 久久激情五月激情| 亚洲图片自拍偷拍| 中文字幕欧美区| 欧美一级日韩不卡播放免费| 91老司机福利 在线| 国产精品羞羞答答xxdd| 午夜精品国产更新| 国产精品高潮呻吟| 精品对白一区国产伦| 欧美视频一区二区三区| 成人av午夜影院| 久久er99精品| 日韩激情一区二区| 一区二区三区四区在线免费观看| 国产视频一区在线观看| 日韩一级片在线播放| 91福利视频网站| 99久久精品免费观看| 国产成人综合亚洲网站| 久久国产精品色| 日韩综合小视频| 一区二区三区中文字幕电影| 国产精品久久久久影院老司| 久久久久久一级片| 日韩一区二区免费在线电影| 欧美三级电影网| 色婷婷综合久久久| www.亚洲免费av| 成人免费毛片app| 国产精品一区二区x88av| 美女视频免费一区| 视频一区二区国产| 亚洲一区二区三区视频在线 | 欧美在线free| 99精品视频一区二区三区| 国产精品一区在线| 六月丁香综合在线视频| 日本怡春院一区二区| 亚洲国产cao| 一区二区三区四区不卡在线| 亚洲人成人一区二区在线观看| 亚洲国产精品精华液2区45| 久久久久久久久免费| 久久伊人中文字幕| 欧美不卡在线视频| 日韩欧美不卡一区| 日韩欧美不卡在线观看视频| 日韩一级二级三级精品视频| 555www色欧美视频| 欧美一区二区视频网站| 日韩亚洲欧美高清| 91精品福利在线一区二区三区| 9191国产精品| 日韩欧美一级精品久久| 日韩区在线观看| 日韩欧美一区二区不卡| 日韩欧美美女一区二区三区| 欧美一级片在线看| 日韩欧美自拍偷拍| 欧美不卡一二三| 2022国产精品视频| 久久精品在线免费观看| 国产精品素人一区二区| 亚洲欧美在线高清| 亚洲乱码日产精品bd| 亚洲午夜视频在线| 日韩专区欧美专区| 久久黄色级2电影| 国产精品资源在线| 波多野结衣中文字幕一区| voyeur盗摄精品| 日本二三区不卡| 欧美日韩国产另类一区| 欧美一级片在线观看| 久久久久久日产精品| 中文字幕精品综合| 亚洲免费毛片网站| 亚洲国产欧美日韩另类综合| 日韩精品电影一区亚洲| 久久97超碰色| 成人福利视频网站| 欧美亚洲另类激情小说| 欧美一区二区三区免费大片| 久久九九久久九九| 亚洲伦理在线免费看| 日韩精品视频网| 国产在线播放一区三区四| 成人网页在线观看| 欧洲中文字幕精品| 日韩视频免费观看高清在线视频| 久久久久久久久岛国免费| 中文字幕一区二区三区精华液| 亚洲午夜精品17c| 精品一区二区免费视频| 不卡视频一二三四| 欧美亚洲一区二区在线观看| 日韩欧美久久久| 国产精品初高中害羞小美女文| 亚洲一区二区精品视频| 久久精品72免费观看| 成人av在线看| 欧美日韩免费一区二区三区视频| 精品欧美一区二区久久| 国产精品高潮呻吟久久| 日本午夜一区二区| 成人免费黄色大片| 欧美久久高跟鞋激| 欧美韩国一区二区| 亚洲国产va精品久久久不卡综合| 国产美女视频91| 在线免费观看日本一区| 精品免费日韩av| 亚洲欧美成aⅴ人在线观看| 久久精品国产亚洲a| 91在线免费播放| 日韩久久久精品| 自拍偷拍亚洲激情| 久草精品在线观看| 色94色欧美sute亚洲线路二| 欧美电影免费观看高清完整版在| 亚洲色欲色欲www在线观看| 免费视频一区二区| 一本到不卡免费一区二区| 欧美精品一区在线观看| 一区二区三区在线观看动漫| 国产一区二区在线观看免费| 欧美三级中文字| 国产精品久久久久久亚洲毛片 | 国产在线视视频有精品| 日本久久一区二区| 久久精品视频网| 日韩精品一卡二卡三卡四卡无卡| 成人久久18免费网站麻豆 | 亚洲与欧洲av电影| 粉嫩蜜臀av国产精品网站| 欧美一级黄色录像| 一区二区在线免费观看| 国产 欧美在线| 欧美zozo另类异族| 五月天视频一区| 91亚洲精华国产精华精华液| 久久精品亚洲麻豆av一区二区| 污片在线观看一区二区| 色婷婷综合久久久久中文一区二区 | 91网站在线观看视频| 久久蜜臀精品av| 日日噜噜夜夜狠狠视频欧美人 | 国产一区二区久久| 欧美伦理影视网| 亚洲综合在线免费观看| 国产91丝袜在线观看| 精品成人佐山爱一区二区| 视频在线观看一区二区三区| 一本一道久久a久久精品综合蜜臀| 国产区在线观看成人精品| 经典一区二区三区| 日韩一区二区精品葵司在线| 亚洲大片在线观看|