Flue gas denitration system

Abstract

The invention discloses a flue gas denitration system and a denitration process thereof, and belongs to the field of flue gas purification. The flue gas denitration system comprises a coal-fired boiler, a first denitration reaction tower, a dust remover, a second denitration reaction tower and a water circulation device; the first denitration reaction tower is sequentially provided with three denitration reaction layers from top to bottom; the uppermost denitration reaction layer is a SiO2 reaction layer, and is composed of a glass fiber composite layer with a main body of glass fiber; Fe2O3 particles are uniformly distributed in the SiO2 reaction layer; and an NH3 pipeline for introducing gas NH3 is arranged at an inlet of the first denitration reaction tower. The beneficial effects of the invention are that: two-stage denitration process is adopted, the denitration functions of the first denitration reaction tower and the second denitration reaction tower are distinguished; the firstdenitration reaction tower is used for realizing primary coarse denitration treatment on the flue gas aiming at impurities, larger particles and about 50% of NO gas in the flue gas, and the second denitration reaction tower is used for treating finer particles and residual NO and NO2 in the flue gas to remove more than 95% of nitrogen oxides in the flue gas, so that the purpose of deep denitration is achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a flue gas denitrification system. Background technique [0002] At present, domestic amino denitrification technologies are mainly two mainstream technologies: SCR and SNCR. SCR is the selective catalytic reduction method, and SNCR is the selective non-catalytic reduction method. At present, these two technologies mainly have the following problems: [0003] 1. The catalyst needs to be used in the operation of SCR, and the cost is very high. Among them, the catalyst cost of SCR technology usually accounts for about 40% of the initial investment of the SCR system, and the operating cost is largely affected by the life of the catalyst. However, the optimal reaction temperature of the SCR catalyst is 400-600°C, and the actual flue gas temperature exceeds the design temperature, which will easily reduce the life of the catalyst and increase the operating cost. ...

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Problems solved by technology

[0007] In order to overcome the problems of high equipment cost, low denitrification efficiency, and low service life in the prior art, the present invention provides a flue gas denitrification system, including a coal-fired boiler, a first denitrification reaction tower, a dust collector, a second denitrification A reaction tower and a water circulation device, the outlet of the coal-fired boiler is connected to the inlet of the first denitration reaction tower, the outlet of the first denitration reaction tower is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the second denitration reaction tower. The denitration reaction tower is connected, the water circulation device is connected end to end with the second denitration reaction tower, and the first denitration reaction tower is provided with three layers of denitration reaction layers in sequence from top to bottom, and the denitration reaction layer at the top is SiO 2 reaction layer, the SiO 2 The reaction layer is a porous structure, which is composed of a glass fiber composite layer whose main body is glass fiber, SiO 2 Fe is evenly distributed inside the reaction layer 2 o 3 Particles, the inlet of the first denitration reaction tower is equipped with a gas NH 3 NH 3 pipeline

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