A case study of Henan province, as a major coal-producing province Henan coal quality is moderate, but ashis also about 30%, is the coastal area of ash content in coal 3 times.


"Coal quality index is the most important design boiler based on coal types, generate the startling amountof pollutants. "Lou says Jin Qi, brown coal in boiler combustion NOx can be as low as 200 mg/m³, andpingdingshan coal up to 650 mg/m, 450 mg/cubic metres of bituminous coal.


To achieve the same emission limit value, and denitration efficiency of various coals need different, thecorresponding costs are not the same. Also sulfur, coal-electricity in coastal areas after washing,sulphur content below 0.5%, including Shanxi, Shaanxi, and Yunnan and Sichuan in the Mainland and otherplaces, sulphur content of coal and can even reach more than 4%, Henan is less than 1% per cent of the total production of low-sulphur coal one-third.


"We called aroma of coal with sulphur content of less than 1% coal, called smelly coal is greater than 2%.Made the same amount of electricity, coal-pollutant emissions will be of poor quality coal well severaltimes. "Lou Jin Qi, said if at all costs, and in theory can do" near-zero-emission ". However, theevaluation of pollution control technology options are correct we should evaluate the environmental andeconomic benefits, it is also decided to "near-zero-emission" key to widespread implementation or not.Therefore, "must be within our capabilities."


Lou flag, according to the estimates, in Zhejiang province to achieve "near-zero-emission" theenvironmental cost to electricity price increases on the basis of the original 1~1.3/kWh, while Henanprovince, you need at least 1.5~1.8/kWh.
Be sure to use a scrubber?


Influence of coal quality front-end smoke concentration, wet electrostatic precipitators overwhelmed power plant should fully tap the potential of existing equipment


Currently, coal-fired units implementing ultra clean of dust emissions from the conventional process islearning from Japan after technical adjustments to the individual coal-fired power plants based on form.Most of the dry electrostatic precipitator electrostatic precipitators in low temperature, there are alsosome use electric-bag composite dust collector, as wet-type electrostatic precipitator "Terminal"important equipment.


However, China's coal-fired power stations "coal market" seriously affected the stability of entering theboiler, most coal-fired power station coal low heat value, ash content of being higher and volatilereality, the resulting smoke concentration conditions vary widely, making dry electrostatic precipitatorefficiency fluctuations, export concentration cannot be long-term stability within the design range.


Coupled with our existing wet FGD themselves some problems, such as high concentrations of plaster droplet escapes, front end out of control causing the back end wet electrostatic precipitators overwhelmed, appear"live" phenomenon, which affects the "near-zero-emission" target is achieved.


Assessment Center of Ministry of environmental protection of thermal power engineering expert Jin Chenoften had to participate in the review of the EIA of thermal power projects, recently encountered such aproject: due to bad coal project proposal for "near-zero-emission" technology package is "low temperaturefilter high frequency power supply + v + ESP + +FGD+ wet dust collector for rotating electrical machineselectric field". The accumulation of so many technologies, he seems very unscientific or unreasonable.


Jin Chen believes that wet electrostatic precipitators in use there are some defects, such as covers,brought the site layout issues, increased investment in equipment and operating costs while increasing thevolume of water consumption and waste water treatment, water shortages in North China was also abottleneck. "Wet electrostatic precipitators in coal-fired power plants in China for a short time, theresults take time to test and evaluate. So, how to create clean emissions technology, making it more suitable for China's current situation of coal-fired power plants, is the focus of future exploration. ”


In recently Fujian Dragon net environmental Corporation held of "Super NET electric bags composite dust technology seminar" Shang, Dragon net environmental Deputy Chief Engineer Wu Jianghua proposed has super NET electric bags composite dust and Super NET efficient desulfurization of Super net emissions process programme, and Dragon net environmental of first Super NET electric bags demonstration engineering--Guangdong Yue Electric sand angle c power plant 2nd, furnace 600,000-kilowatt unit dust transformation project will Yu next year early voted shipped.


According to Wu Jianghua introduction, this process takes the pertinence and effectiveness of technicalmeasures of high long-term stability is less than 5mg/Nm3 would guarantee not only the carbon, andsynchronization equipment run resistance is less than or equal to 1100Pa, the filter bag service life isnot less than 5 years of performance.


"Compared to the conventional process, this process cancels the wet electrostatic precipitators, thepresent situation of coal-fired power plant markets more resilient, with significantly less investment,covers an area of province, the advantage of stable and reliable. "For example, he said, to 2x1000MWunits, for example, ultra-clean electric-bag composite dust removal technology with low temperaturecompared to + ESP + wet electrostatic precipitators, one investment may save 118 million Yuan, covering anarea of 1000 square meters per cent reduction.


Guangdong electric power Design Institute Director Engineer Huo Peiqiang ultra-clean electric-bag willsurely also in achieving ultra low emission coal-fired power plant's role in the process.


According to him, currently ultra-low emissions demonstration projects have been put into operation, atypical process in three steps: the first step is to control the fuel ash, reduce the amount of dustgenerated from the source; the second is after a boiler set up various types of dust; the third step is toplay the wet FGD system (demister) the honor role.


If the first 3 links are ultra-low-emission standards is not reached, you need to install wetelectrostatic precipitators to the end checking smoke emissions. Due to the installation of wet-ESPenormous investment, so the power plant unit should make full use of the potential of existing equipment,no scrubbers for actively trying to reach ultra low emission levels and radically improve efficiency.


In front of wet flue gas desulfurization of flue gas waste heat recovery heat exchanger for heat recovery and process factors to be considered.


As of press time, coincided with the transformation of electrical energy-saving upgrades and mobilizationof national coal videophone Conference has just ended, and Zhai Qing, Vice Minister of environmental protection pointed out in his speech, to be on an ongoing basis by 2020, and strive to complete the upgrade of more than 150 million kilowatts of coal-fired power units, to further achieve the emissionlevels of gas emissions.

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