In recent years, with the continuous improvement of environmental protection requirements for power enterprises, the investment of power plants in desulfurization, denitration and dust removal has increased unabated. At present, the installed proportion of flue gas desulfurization in China's coal-fired power plants is 30 percentage points higher than that in the United States, and the proportion of flue gas denitration is 5 percentage points higher than that in the United States. (data and pictures)

After winter, towering chimneys and white smoke turning with the wind are a special scenic spot in many northern cities. However, in fact, the smoke contains a large amount of dust and harmful substances, such as sulfide and nitrogen oxides, which is one of the factors causing smog. Some studies have shown that the current situation of air pollution in China is very serious, which is specifically reflected in the general exceeding standard of total suspended particulate matter in urban atmospheric environment, the maintenance of sulfur dioxide pollution at a high level, the rapid increase in the total emission of motor vehicle exhaust pollutants, and the severe trend of nitrogen oxide acid rain.

Among them, soot pollution is still a major pollution source of sulfur dioxide, nitrogen oxides and dust in China. According to the data of the Bureau of statistics, the national coal consumption in 2013 was about 3.62 billion tons, with a year-on-year increase of 70 million tons, an increase of 1.97% On the premise that the energy structure cannot be changed in a short time, air pollution control is imminent.

Favorable environmental protection policies

In September this year, the national development and Reform Commission, the Ministry of environmental protection and the Energy Administration jointly issued the action plan for the upgrading and transformation of coal-fired power energy conservation and emission reduction (2014-2020), which requires strict control of the emission of air pollutants. It is proposed that the emission concentration of air pollutants from new coal-fired power generating units in the East and central regions should basically meet or close to the emission limit of gas turbine units, and promote the environmental protection transformation of air pollutants from existing coal-fired generating units.

This is a strict standard. Gu Jilin, special adviser to the general manager of the environmental protection branch of China Huadian Corporation, has worked in the power industry for more than 30 years. He told reporters that in the early years, the pollutant emission of power plants was only dust removal. After 2000, in order to adapt to the large-scale construction of power plants around the country with economic development, a large amount of coal-fired pollutants caused air pollution to become prominent, and the air pollutant emission standard was revised three times, Strictly control the emission of dust, sulfur dioxide and nitrogen oxides.

According to the plan, the average coal consumption for power supply of new coal-fired generating units in China is less than 300g / kwh; The emission concentration of air pollutants from new coal-fired generating units in the eastern region basically reaches the emission limit of gas turbine units. In principle, new units in the central region approach or reach the emission limit of gas turbine units, and new units in the western region are encouraged to approach or reach the emission limit of gas turbine units. Support simultaneous joint and coordinated removal of air pollutants and reduce the emission of sulfur trioxide, mercury, arsenic and other pollutants.

In this context, the development of relevant environmental protection equipment has ushered in opportunities. According to industry estimates, during the 12th Five Year Plan period, the investment in desulfurization and denitration, urban sewage and waste treatment facilities will reach 600 billion yuan; There is a huge demand in the fields of waste heat and residual pressure power generation, comprehensive utilization of three wastes and smoke and dust control in the industrial industry.

Thermal power plant emission reduction awesome

According to the data of desulfurization and denitration Committee of China Environmental Protection Association, the capacity of flue gas desulfurization units of thermal power plants put into operation in 2013 was about 36 million KW; By the end of 2013, the capacity of flue gas desulfurization units in thermal power plants has been put into operation, accounting for about 720 million KW, accounting for 91% of the capacity of coal-fired units in service in China

At present, the first ultra-low emission coal-fired unit put into operation by Huadian Group has been put into operation in Shijiazhuang, Hebei. According to the technicians of Yuhua Thermal Power Co., Ltd., the unit has invested nearly 500 million yuan to carry out environmental protection technical transformation. The denitration is mainly due to the addition of the third layer of catalyst in the boiler SCR device, so that the denitration efficiency can reach 92.3% and the emission concentration of nitrogen oxides can be reduced to less than 50 mg / m3; For desulfurization, two-stage absorption tower shall be added to realize tandem tower double cycle operation, so that the desulfurization efficiency can reach 99% and the sulfur dioxide emission can be reduced to less than 35 mg / m3; Based on the dry electrostatic precipitator and high-frequency power supply, the wet electrostatic precipitator is built, the dust removal efficiency reaches 99.93%, and the smoke emission concentration is reduced to less than 5 mg / m3.

In recent years, with the continuous improvement of environmental protection requirements for power enterprises, the investment of power plants in desulfurization, denitration and dust removal has increased unabated. Wang Zhixuan, Secretary General of China Power Council, said that at present, the installed proportion of flue gas desulfurization in China's coal-fired power plants is 30 percentage points higher than that in the United States, and the proportion of flue gas denitration is 5 percentage points higher than that in the United States. Only in January 2013, the installed capacity of denitration put into operation in China was close to the total installed capacity of denitration in the United States.

Wide market for air pollution control

Although the emission standards of thermal power plants under high pressure are basically close to or have reached the requirements of current developed and regions, ordinary people feel that the air quality does not seem to have improved significantly, and the haze is still serious.

Lu Guangjie, Deputy Secretary General of desulfurization and denitration of China Environmental Protection Industry Association, pointed out that in terms of the use of coal, China produces 4 billion tons of coal every year, half of which is used by power plants and half by non electric industries, such as metallurgy, cement, industrial boilers and industrial kilns. Although the desulfurization installation of power plants has reached more than 90% and denitration has reached more than 50% (denitration will reach more than 85% in 2015). The other half of the non electricity industry has also installed some, but there is still a big gap compared with the electricity industry. For example, the existing enterprises in the cement industry still implement the emission standard of 800 mg / m3 as of June 30, 2015, and the new enterprises implement the emission standard of 400 mg / m3 as of March 1, 2014, and implement the emission limit of 300 mg / m3 for key areas.

This is regarded as a future opportunity by environmental protection equipment manufacturers. Wang Kailiang said that after the completion of environmental protection equipment in the power industry in the next step, it is bound to gradually turn to non electric industries such as steel, cement and industrial boilers. The environmental protection devices in these industries are relatively small and scattered. There is no technical difficulty for us. The key is market and cost control. If the market is not standardized, it is difficult for us to compete with small companies. Wang Kailiang suggested that the government strengthen industry supervision and market access, so as to fundamentally eliminate price competition and Jerry building.

With the gradual improvement of environmental protection requirements, laws and regulations on reducing fuel sulfur content have been enforced, requiring that energy products used for industrial and civil use must be purified. With the continuous improvement of requirements, the industry threshold will also increase year by year, and the market may focus on enterprises with high-performance and environment-friendly purification products and technologies.