Controversial "wet FGD"：Who is causing haze "culprit"?

"If the research team able to smog formation mechanism and the real dangers thoroughly studied，Propose a more effective response strategy，'Who capture，Who rewards'! "This is the two sessions this year，A task put forward by Premier Li Keqiang。From March to August，Five months have passed，"Haze causes," the Prime Minister concerned，Did you find the answer?

8Month 10 days，On the "causes of haze and scattered coal control" as the theme of Shandong Science and Technology Forum think tank in 2017 the first phase，Independent investigator、Shandong deputy director of science and technology development strategy、The results of three years he continued follow-up survey of ecological civilization research center announced the provincial main Renzhou Yong answered, "Prime Minister's Questions"，He said："Wet desulfurization leading to 2013 the main cause of a large outbreak of haze，The main cause of fog and haze rebound in 2016 is also an iron fist governance。”

This finding was executive vice president of Fudan University, Professor of Atmospheric Science Research Institute Chen Jianmin、Professor of Chemistry and Chemical Engineering, Shandong University, Zhu group support。

but，For the "wet desulfurization" is the main reason for the haze，Meeting disagreement，stand by、Opposition and neutral tripartite express their views。Wang Sheng from the State Power system of a conventional survey does not prove that "wet FGD" the "prime suspect"，This is similar to the China Electricity Council full-time vice chairman ANCIENT views。The latter in an interview before the secondary haze caused by the wet FGD statement resolutely refuted，And that "the negation of desulfurization and denitrification of pseudo-scientific positive effect" untenable。

What is wet FGD? Why it will cause parties to the dispute? What is the reason given by each of the parties? Which point of view closer to the truth? Science and Technology Daily reporter interviewed some experts。

"+ Facts and reason" to prove safety "wet FGD"

"Coal is the main cause of air pollution，Therefore, power plants and other large coal-fired plants Dust、Desulphurization、Denitrification is the main measure decades of air pollution。”

Yong told Technology Daily Reporter，According to the survey，Currently desulfurization of flue gas is 90% or more by a wet desulfurization，I.e., by spraying a slurry of limestone contact reaction with sulfur dioxide in the flue gas molecule，The final gypsum。Most of the gypsum collected by dehydration，However, fine particles in the slurry and the water-soluble salts of，Escaping with the flue gas desulfurization tower，Into the atmosphere through the chimney。past，A portion of relatively large particles，Near the chimney because gravity landing，Commonly known as "gypsum Rain"，Now, after the installation of wet electrostatic precipitator or high efficiency demister，This section basically can not see the；And PM1.0 following submicrometer particles and water-soluble salts，Then with the flue gas、Vapor discharged into the atmosphere，Particles Small，Easier to float，Treatment is difficult。

In this forum，School of Chemistry and Chemical Engineering, Shandong University professor Zhu Liaoning industrial base and flue gas treatment industry technology innovation strategic alliance chairman TEENAGER support this assertion are different forms of research。

Yong showed pieces of the picture to reporters，Before and after heating season they exhibit the form of a graph，In some cities of Beijing, Tianjin and surrounding、PM2.5 changes in some cities in Heilongjiang Province，In order to verify that the change of wet FGD fog haze significant degree。

"Huadian Power Research Institute、Harbin Institute of Technology and other researchers to do experiments to test power plant boiler，From the measured angle technology provides scientific support micro-level analysis and judgment for me at the macro data。"Zhou Yong expressed，Experimental Study of Huadian Power Research Institute Li Zhuang, who in 2015 made the wet desulfurization 660MW pulverized coal PM2.5 emissions impact on display，Number PM2.5 particles discharged into the atmosphere，It is 2.094 times the boiler outlet without dust removal equipment，Is 458.28 times dedusting equipment exports。

After desulfurization process，PM2.5 particles Number of peaks at 0.07 microns。As the number of these vapor emissions to the atmosphere after dehydration ultrafine particles than doubled without environmental protection facilities，Become two key factors induced haze：Humidity and condensation nuclei，Coupled with the static stability weather or temperature inversion，The formation of different degrees of mist or haze。

Supporters and opponents of four debate：After the hustle and bustle，Cause to be solved

Science and Technology Daily reporter got a CPPCC National Committee invited representatives abroad、INTERNATIONAL FUND FOR CHINA'S ENVIRONMENT(IFCE)He Ping, president of policy recommendations in June 2017 submitted to the authorities，This material is about 3000 words，The core idea is "wet desulfurization cause haze outbreak in China a large area，Immediate measures "。

In 2016, Beijing, Tianjin and winter haze over the previous year, aggravating circumstances，He Ping published earlier this year, "do not listen to the views of Chinese engineers, three-year rule haze reactive! "Articles，This text quickly a hot topic on the Web，Its opponents is ANCIENT。

In the interview,，ANCIENT representation："If you must let me evaluate desulfurization and denitration ratio of positive action and side effects of haze influence governance words，I think it should be a ratio of 99 to 1，That 99 score is overwhelming，1Parts of side effects will increase haze，That may increase the number of aerosol emissions and other difficult to remove，But this increase is minimal，The proportion of the environmental impact of PM2.5 mass is almost negligible。”

Afterwards，Two people in a variety of media controversy four rounds，Even cause the relevant departments attention。Science and Technology Daily reporter got the news that，The relevant departments have held a special seminar，But each of the parties is insufficient evidence，And finally nothing。

The above argument also spread to this "causes smog and coal for Control" Forum。"Wet FGD" caught in controversy，Who are the causes of haze "culprit?" Zhou Yong believes，Wet FGD for SO2 removal enormous credit，But it is the last link in a discharge less than，Secondary air results in increased ultrafine particles，Need to improve。"Data do not lie。Independent data using large、Meteorological data and Shandong University, 2013 research was analyzed by monitoring data，We have proved that in 2013 a large outbreak of haze is a mutation、Emergencies。Only wet FGD is a completely consistent mutagenic。”

"Argument is a good thing，And time will prove right and wrong。"Yong said，"But we have to have to play，In the face of this universal battle haze rule，Can not Be Delayed，Adversely affected by aircraft。"Reporter Wang Yanbin