According to the latest statistical data released by the country, the sulfur dioxide emissions from thermal power plants in China have exceeded 50% of the national sulfur dioxide emissions and become the chief culprit of sulfur dioxide pollution. Although starting from 2003, China has already accelerated its efforts to control sulphur dioxide emissions from thermal power plants. However, domestic desulfurization equipment industry is lacking in series development due to its late start and imperfect development. At present, the low localization rate of equipment has seriously hampered the progress of thermal desulfurization in China.
In the process of thermal power generation, dust, sulfur dioxide, and carbon dioxide are the main components of their pollutants. In recent years, the accelerating development of fuel oil and coal-fired power plants has been the main reason why sulfur dioxide has not declined or increased in environmental protection indicators during China's "Tenth Five-Year Plan" period. As an important source of air pollution, sulphur dioxide "works sincerely" with automobile exhaust pollution and conspires to destroy the city's air quality. Sulfur dioxide is acidic. When it is excessively discharged into the atmosphere, it will form "acid deposition". When it encounters water, it may form acid rain and acid fog. When it does not meet with water, it will collect in the form of "dry deposition" in plants and soil, and in soil. After the water meets, it can form more concentrated sulfuric acid. "Acid deposition" leads to soil and river acidification, corrosion of metals, damage to the health of the land, destruction of the growth of animals and plants, and serious damage to the ecological environment.
Therefore, following the dust removal, flue gas desulfurization has become the environmental protection "threshold" required for thermal power plants. Almost all thermal power companies have determined that the "gateway" cost is too high to pass. One of the important reasons is that the localization rate of environmental protection equipment is low.
At present, the limestone-gypsum wet desulfurization technology commonly used by large-scale power plants is mostly imported directly from abroad or purchased key equipment. Every project that is launched must be paid a high patent fee by the technical party. The large investment and difficulties in technical selection have given the power plant a strong reason for delay.
"We have been conducting comparison and selection of desulfurization facilities. Most of the current technology is imported from abroad and the price is very high." said Ma Yongfeng, assistant to the president of Inner Mongolia Erdos Power Company. According to relevant state regulations, their desulfurization facilities should be put into operation in March this year. The high price of imported desulphurization equipment made them prohibitively desulphurization facilities.
Experts believe that the low domestic production rate of desulphurization equipment leads to excessive prices, and that large and medium-sized thermal power plants desperately need more than 100 million yuan for desulphurization equipment. According to calculations, the price of domestic equipment is only equivalent to half or two-thirds of the price of imported equipment. However, currently there are few models available for selection, and the operation of equipment is not stable enough.
China's dependence on desulfurization technology is relatively high abroad, and there are many domestic companies introduce a foreign company technology phenomenon, China's nearly 100 size desulfurization companies, large units basically use foreign desulfurization technology, under normal circumstances 200 MW The desulfurization project of the unit needs to pay a technical fee of more than 3 million yuan for foreign companies. At present, nearly 60% of the desulfurization facilities built in China have been imported from abroad. Domestic companies are only responsible for civil engineering and installation. In general, the cost of using imported equipment is on average 30% higher than the cost of using domestic equipment. Domestic desulfurization equipment lacks independent intellectual property rights, and the domestic proportion of desulphurization equipment is not high, which not only restricts the development of China's environmental protection industry, but also is not conducive to the advancement of technological progress and industrial upgrading of China's electromechanical industry. Therefore, Meng Menglin, director of the Ningxia Hui Autonomous Region Economic Commission, believes that the state must increase the research and development of domestic desulfurization equipment so that enterprises can afford environmental protection facilities.