Pulse generation device used for flue gas purification

Abstract

The invention provides a pulse generation device used for flue gas purification. According to the device, on the one hand, the technical scheme that a pulse power supply insulator and a discharge electrode insulator are arranged on a traditional pulse generation device respectively is improved, one insulator is directly used for making a pulse power supply and a discharge electrode connected, so that the cable length and the loop inductance are reduced, the pulse rising time is shortened, and the plasma generation efficiency in each unit of electric energy is improved; on the other hand, by using a series high-voltage switch set, the voltage of primary pulses is increased, so that the ratio of transformation of a pulse transformer is reduced, and the efficiency of the pulse transformer is improved. When the device is used for the flue gas purification, the flue gas purification efficiency can be improved on the basis of reducing energy consumption, and environmental requirements are met. The experimental results show that when the pulse generation device is used for the flue gas purification, the emission concentrations of flue gas pollutants can be reduced, that is the emission concentration of SO2 is reduced to 35 mg / m<3>, the emission concentration of NOx is reduced to 50 mg / m<3>, and the emission concentration of dust is reduced to 5 mg / m<3>. Besides, compared with the traditional pulse generation device, the power consumption is reduced to 38 KV from 50 KW, and the energy is saved by 24%.

Description

technical field [0001] The invention relates to the technical field of air pollutant control, and more specifically relates to a pulse generating device for flue gas purification. Background technique [0002] In recent years, as my country's environmental problems have become increasingly serious, my country's environmental protection standards have become higher and higher, and environmental protection policies have become more stringent. For example, the "Emission Standard of Air Pollutants for Thermal Power Plants (GB 13223-2011)" stipulates that the emission concentration limit of flue gas pollutants for thermal power plants in key areas is: SO 2 50mg / m 3 , NO x 100mg / m 3 , Dust 20mg / m 3 ; and the National Development and Reform Commission, the Ministry of Environmental Protection, and the National Energy Administration jointly issued the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020)" in 2014. The limi...

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Problems solved by technology

[0004] However, the key to this technology is to provide pulse voltage, which requires the use of a pulse generating device. On the one hand, because the withstand voltage value of commercially available low-voltage semiconductor switches is generally 2000-3000V, the pulse transformer using a single switch pulse generating device It is relatively large, generally above 30, and the transformation ratio between the primary winding and the secondary winding is large, the system inductance is large, and the pulse front is slow, so that the energy injection efficiency of the reactor is low and the energy consumption is large, and the high energy consumption seriously restricts the pulsed plasma. For the development of flue gas integrated purification technology, in some early demonstration projects, the power consumption was about 2% of the power generation of the power plant. Therefore, since the technology appeared in 1986, it has not achieved large-scale engineering application; another On the one hand, in the voltage waveform of the pulse generating device used for flue gas purification in the traditional technology, the rising edge is too slow, resulting in a low efficiency of plasma generation per unit of electric energy, which restricts the flue gas purification efficiency and cannot meet the increasingly stringent flue gas pollution emission concentration standard

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