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The author:(作者)aaapublished in(发表于) 2014/7/27 13:18:16 Coal to gas too hard for China’s smog prevention trump card
Xinhuanet, Beijing, July 27 (reporter Ni Yuanjin)-23rd in Beijing shut down a large coal-fired power plant, replacement of gas-fired cogeneration plant formally put into operation on the same day. The next two years, Beijing will also shut down a number of coal-fired power plant coal-fired units, switching to natural gas. This "coal gas" approach is an important measure to curb smog pollution in the capital. Varied, this approach throughout the country which could not become a smog control in most parts of the "trump card".
In combustion emits enormous amounts of coal dust, sulfur dioxide, carbon dioxide and other atmospheric pollutants, and clean energy is almost zero pollution discharge of natural gas, "coal gas" very significant environmental benefits. Beijing to take "coal gas", through the coal-free in the Center, cut coal for power plants and other measures aimed at by 2017 will total amount control in less than 10 million tonnes of coal-fired, it is undoubtedly necessary, but also affordable.
But China is a country with many little coal, oil, gas. Coal accounts for more than 60% of total energy consumption in China. Chinese Academy of engineering academician Cao Xianghong believes that within 20 years, coal remains the primary resource. Mass importing gas from the international markets depends on overseas supply capacity, its own transport capacity and geopolitical factors. Shale gas is still "potential resources" does not have a large "real yield" nuclear, solar, wind, tidal power also has its technical challenges, many is difficult to understand immediate thirst.
Higher gas costs and the availability of natural gas in China is limited, decided to walk around "coal gas" road to cleaner air must be in line with local conditions, within our capabilities, not in spite of resource constraints, rush on large "coal gas" project, otherwise, not only economically unaffordable, will also supply can't keep up with the supply of natural gas should be nervous, "upper than the lower one" problem.
Experts say that should be based on national conditions and realities in China, clean utilization of coal, and governance "bulk coal burning" the focal point of the governing issues such as haze.
Last September, the State Council issued the plan of action for prevention of air pollution, and calls for "a full treatment of small coal-fired boilers, accelerating desulphurization, NOx, dust removal renovation in key industries project."
In China's coal-fired, about 20% is the decentralized use of "coal", such as small boilers, coal for home heating, food and so on. These units and the family is no longer the same as thermal power enterprises using environmentally-friendly, dust desulfurization and denitrification. Therefore, widely applied to control air pollution can not be ignored and rural heating industrial boiler using coals, such as emissions of pollutants.
Problem is, China's industrial boiler "coals" outs is still unclear. 30%-70% boiler located in the population area, and low emissions, harmful to human health. Does not solve this one, China's coal-smoke pollution control hardly revive.
According to environmental Department environment and economic policy research center researcher Wang Hanchen estimates, industrial boiler, and family heating, and catering with coal, "bulk coal" of coal consumption in 600 million tons-700 million tons, accounted for national coal consumption of 20%, after power industry, in non-electric industry up, emissions sulfur dioxide close 10 million tons, and power industry of sulfur dioxide flush, emissions nitrogen oxides is more than 3.2 million tons, ranked third, after power and motor vehicle, above cement industry emissions total. Thus, "coals" because of its difficult to concentrate on governance led to coal-fired units with higher treatment costs, should be "replace coal with gas" key.
At present, China can make use of the limited resources of natural gas at home and abroad. How to make good use of these limited gas sources is very important. Currently, the provinces and cities are cutting coal task, each positive push to the national gas supply. Experts recommended the development of the coal target, to enable natural gas to "steel" on the bottom line.
"Pollution from coal burning, than the pollution caused by burning lot. For example, the State requires burning ' anthracite ', but retail Burns ' bituminous coal ', led to heavy pollution is difficult to control. "Said Cao Xianghong, the same 10 million tons of coal, coal is very difficult, but big coal enterprises is relatively easy, so some places develop reduction policy" trivial ", uses valuable natural gas resources in may, through effective emission reduction technology to clean up coal.
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