Use a thermal power fly ash is "article"
In early January 2012, the national development and reform commission issued the "1025" resources comprehensive utilization instruction opinion "and" the bulk solid waste comprehensive utilization plan ", which puts forward, "by 2015, to construct a group of fly ash high added value, with greater proportion of comprehensive utilization base, a group of professional support, a key enterprise of new 60 million tons of waste terms, comprehensive utilization ability fly ash increased from 70% to."
Fly ash, commonly known as the coal dust. Main produced in the power plant after coal left solid waste (not combustible dust particles, a form), which contains a lot of alumina, silica and cadmium, chromium, mercury, lead heavy metal element. At present, the main industrial emissions is one of the waste residue. In looking for green power fire in the transformation of the half, the uncommon words fly ash, began to more and more people into the field of vision.
Fly ash pollution, more attention to improve
According to green peace organization estimates, by the end of 2009, China's production of fly ash has reached 375 million tons, equivalent to China that year the total amount of urban living garbage two times more. If you don't get these fly ash properly, not only cause environmental pollution, more will be health hazard.
At the beginning of this century, China's entry into the thermal power of the big leap installed period, the number of fly ash is produced each year rising trend. Although have the prevention and control of environmental pollution by solid waste "(2004 revision); In 2009, the heavy metal pollution prevention and control work on strengthening the guidance "and other relevant laws and regulations. But overall, in the recycling and fly ash in the location, the young, leakage, the scattered loss prevention measures, many problems still exist. According to reporter understanding, our country's at present a lot of local processing fly ash or to single emissions and piled up way, and preventive measures do not reach the designated position, meet the rain or windy weather, can appear the absence or leakage, such as into the atmosphere or drinking water, farming, can cause great harm.
In 2011, our country appear more than a heavy metal pollution incident, although not directly related to the construction of coal-fired power plants and fly ash, but as heavy metal element contains a lot of fly ash, the potential pollution and damage is very big, can not be ignored. Vice premier li keqiang in the seventh national conference on environmental protection, said: "to strictly implement the heavy metal pollution comprehensive prevention and control planning, effectively reduce the harm of heavy metal pollution. One is the reasonable adjustment in heavy metal enterprise layout, strictly implement health protection in the ghetto distance, and drinking water, food security area must be stopped on the new project. The second is to improve the access requirements, urge enterprise depth management, ensure stable discharging standard, not the standard production enterprise are the till shut. Three is key to clamp down on crime prevention and control engineering measures focus on regional take control and speed up resolution chromium residue, DAMS and problems left over by history."
Reuse, recycle economy development of thermal power
"No useless junk, only put resources. Wrong" For thermal power for fly ash is even more so. Silicon alloy aluminium extracted and used to make cement, is the main way to future by using fly ash. The former can be used to replace aluminum, silicon raw material, have al-si alloy manufacturing; The latter can help improve the efficiency of cement.
At present, our country some areas have in promoting the circulation development pattern. Reports say, shanxi mined here investment of 3.348 billion yuan RMB for the construction of six projects, the years by using fly ash can reach 2.42 million tons. By the end of 2011, shenhua ZhunGeEr mining area resources comprehensive utilization of mineral demonstration base of the inaugural and ZhunGeEr shenhua coal mining associated resources of circular economy industry project a period with annual output of 1 million tons of aluminum oxide demonstration plant construction, shenhua group deputy general manager, China shenhua energy Co. LingWen President, said the project from circulating fluidized bed power plant waste residues, fly ash in alumina extraction and gallium, and related products production processing. Can alleviate at present our country the scarcity of aluminum status quo, and to the country of circular economy industry, energy conservation and emission reduction work is a major revolution, has the significant practical significance and historical significance."
And these will just our country "1025" promoting circulation economy during the festivities. In the recently issued by the "1025" resources comprehensive utilization instruction opinion "and" the bulk solid waste comprehensive utilization plan ", the fly ash, including a variety of solid waste comprehensive utilization of how cycle have a comparatively review thin planning, and it proposes to construct a group of fly ash high added value, with greater proportion of comprehensive utilization of base.
Reuse, still need to various efforts
The recycling of fly ash, not only have the economic value, more social value. "1025" period, the recycling will continue to promote and implement mode. But at the same time, experts also said the current our country in fly ash reuse also above problems, mainly in three aspects: one is the technical level, the comprehensive utilization of coal fly ash is a very high technical requirements of the project. Our country at present in this technology to improve level; 2 it is economic problems. Overall, our country in the comprehensive utilization of resources of the higher cost, on the one hand, the project investment funds needed for the high amount; On the other hand is the high cost of transportation; Three is policy constraint is not strong, support insufficient. In the relevant. More than 20 industry standard, most no mandatory requirements, the corresponding supervision work often strength is not big. In the present fire power under the condition of the general decline is difficult to implement them effectively. In addition, countries in the relevant taxes and encourage policy, support also need to be further improved.
Also the expert points out, realize the effective recycling fly ash this goal, not to accomplish in one move, step in the process of promoting, first to do the coal fly ash has occurred the pollution in work, and how to effectively prevent the new problems of pollution.
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