Method for simultaneously removing submicron particles and nitrogen oxides (NOx) in coal-fired flue gas

Abstract

The invention relates to a method for simultaneously removing submicron particles and nitrogen oxides (NOx) in coal-fired flue gas, which comprises steps of enabling the coal-fired flue gas to pass through a preheater and a dust remover and then enter a semiconductor control rectifier (SCR) reactor, removing superfine particles below PM1.0 in the coal-fired flue gas after the coal-fired flue gas passes through a first layer of a reaction material of the SCR reactor, and enabling the coal-fired flue gas to continuously contact with a second layer of the reaction material of the SCR reactor for removing the NOx in the coal-fired flue gas in the presence of NH3. The first layer of the reaction material of the SCR reactor is polytetrafluoroethylene (PTFE) and propene polymer (PP) composite filter electret layer. The second layer of the reaction material of the SCR reactor is a catalyst layer, wherein an active ingredient of the catalyst layer is cerium dioxide (CeO2), a promoter is precious metal rhodium, and a load body is a synthetic fiber made from polysulfonamidefibre (PSA) and a glass fiber through a non-weaving process. A third layer of the reaction material of the SCR reactor is a base fabric layer. The method can simultaneously remove the submicron particles and the NOx in the coal-fired flue gas, is fast and efficient, greatly reduces operation cost, and has remarkable environment benefits.

Description

technical field [0001] The invention belongs to the field of purification of coal-burning flue gas, in particular to a method for simultaneously removing submicron particles and NOx in coal-burning flue gas. Background technique [0002] With the development of global industrialization, the problem of NOx pollution in energy utilization is becoming more and more serious. All countries in the world have established strict environmental standards for NOx emissions to control NOx emissions. NOx emissions from coal-fired power plants account for a large proportion of man-made stationary pollution sources. Therefore, how to effectively eliminate NOx in the flue gas of power plants has become an important topic of concern in environmental protection. Among many NOx control technologies, SCR method has been widely used all over the world due to its maturity and reliability, high denitrification efficiency, good selectivity and high cost performance. Take NH 3 The SCR method as ...

AI Technical Summary

Problems solved by technology

The current dust removal technology has a treatment efficiency of less than 90% for these fine particles, and the discharge of a large amount of fine particles has caused a great burden on the environment

[0012] To sum up, in recent years, there have been many domestic and foreign invention patents on the preparation of new catalysts for the removal of NOx by catalytic reduction (SCR), but there are not many methods that can simultaneously remove NOx and PM1.0 and below ultrafine particles See

Although there is an invention patent on the preparation of melt-blown polypropylene electret filter material, its application field is limited to the relevant application in air purification high-efficiency filters, and has not been used for the simultaneous removal of PM1.0 and NOx in coal-fired flue gas. Combination of removal process

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