Device and method for removing nitrogen oxide by combining magnetic field with single-medium barrier discharge
A single-dielectric barrier and nitrogen oxide technology, applied in the field of flue gas denitrification, can solve problems such as poor reliability and stability, dust accumulation in the air preheater, and large amount of operation and maintenance. The effect of small area and simple system structure
Inactive Publication Date: 2016-04-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0008] The main disadvantages of SCR technology are: the catalyst is expensive and easily poisoned; the investment cost is high, and the equipment cost is high; when burning high-sulfur coal, it is easy to cause dust accumulation and blockage of the air preheater
The main disadvantages of SNCR technology are: complex system, large amount of operation and maintenance; low denitrification efficiency; poor reliability and stability of operation
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0027] In order to achieve efficient removal of nitrogen oxides, the present invention provides a novel flue gas denitrification method, the process is as follows figure 1 As shown, ethylene is added to the flue gas after combustion, and after mixing, it enters the reactor 1, and the reactor 1 is a dielectric barrier discharge reactor. Figure 2-3 It is a structural cross-sectional view of the reactor. Reactor 1 adopts a single medium layer structure, including a medium pipe 14. The material of the medium pipe 14 is quartz, with a length of 500mm, a thickness of 2mm, an inner diameter of 24mm, and a layer of 400mm long copper mesh wrapped outside. As the outer electrode 11, connect the negative pole...
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The invention relates to a device and a method for removing nitrogen oxide by combining a magnetic field with single-medium barrier discharge. A single-medium layer structure is adopted for a reactor; one layer of metal net covers the outer surface of a medium pipe to be used as an outer electrode; a metal inner electrode is arranged in the middle of the medium pipe and is arranged along the medium pipe in the length direction; holes are drilled in the two ends of the inner electrode respectively; the two holes stretch out of the reactor respectively; the hole in one end is a gas inlet and the hole in the other end is a gas outlet; a plurality of air holes are formed in the peripheries of hole walls of the two holes respectively in the reactor; the outer electrode is connected with a negative electrode of a power supply and the inner electrode is connected with a positive electrode of the power supply; one magnet is arranged on the outer side of the reactor in a manner of being parallel to the reactor; after flue gas and ethylene are mixed, mixed gas is introduced into the gas inlet and enters the reactor through the air holes; and combined denitration is carried out on the mixed gas through the common effect of plasmas and the magnetic field and the gas is introduced to an alkaline solution absorption device through the gas outlet, is washed and absorbed and finally is discharged from a chimney. The device and method provided by the invention have high denitration efficiency and high economic values, the NO removing rate is more than or equal to 95% and the energy consumption is reduced.
Description
technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a device and method for removing nitrogen oxides by magnetic field combined with single dielectric barrier discharge. Background technique [0002] In recent years, my country's smog pollution has been very serious. Nitrogen oxides are the main component of smog. Severe smog not only reduces visibility, but most importantly endangers human health. According to the report of the Ministry of Environmental Protection, the total emission of nitrogen oxides in 2013 was 22.274 million tons, and thermal power plants emitted 8.969 million tons, accounting for 40.3%. [0003] At present, flue gas denitrification technologies commonly used in thermal power plants in my country include selective catalytic reduction SCR (Selective Catalytic Reduction) and selective non-catalytic reduction SNCR (Selective Non-Catalytic Reduction). SCR principle is in O 2 In the ...
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IPC IPC(8): B01D53/76B01D53/56
CPCB01D53/76B01D53/56B01D2259/814B01D2259/818
Inventor 汪涛孙保民方永旭吴礼宁罗肖万震天
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)