Double fork type enhanced mixed smoke gas denitration device

Abstract

The invention discloses a double fork type enhanced mixed smoke gas denitration device which comprises a flue and an ammonia spray grid master pipe and is characterized in that the flue is in verticalarrangement; a transverse ammonia spray grid branch pipe is arranged in the flue; the ammonia spray grid branch pipe and the ammonia spray grid master pipe are connected; a plurality of groups of spray nozzles are arranged at the upper part of the ammonia spray grid branch pipe at fixed intervals; the number of each group of spray nozzles is two; the two spray nozzles are upwards inclined at twosides and in the vertical direction at a certain angle; the upper end of the spray nozzles is provided with a spoiler. The device is favorable for sufficiently mixing ammonia gas sprayed into the flueand the smoke gas; the optimum catalysis reduction reaction flow field environment is obtained; the denitration efficiency is improved; the environment is protected.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a bifurcated enhanced mixed flue gas denitrification device. Background technique [0002] Selective catalytic reduction (SCR) flue gas denitrification technology has become the most mainstream technology for realizing ultra-low emission of nitrogen oxides in flue gas of large coal-fired units due to its high denitrification efficiency, mature technology, stable and reliable operation, and low working temperature. The basic principle is that under certain temperature conditions, ammonia gas is used as the reducing agent, injected into the flue through the ammonia injection grid, and then in the reactor, the NOx in the flue gas is reduced to N2 and H2O by catalytic action. Flow field requirements are one of the most critical factors affecting the denitrification efficiency of SCR. In order to ensure good denitrification performance of the system, it is necessary t...

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Problems solved by technology

The national standard stipulates that the maximum deviation coefficient of the concentration on the first layer of catalyst in the reactor should not exceed ±5%. The existing conventional ammonia injection grid is arranged with a single nozzle, and the injection direction of the reducing agent is consistent with the flow direction of the flue gas. The nozzle arrangement has unsatisfactory mixing effect. If it is necessary to meet the technical requirements of ultra-low emission flow field, it may be necessary to increase the length of the flue to prolong the mixing distance of ammonia and air, or to increase the mixing effect by adding a static mixer, which not only increases the investment cost, but also It also increases the operating cost of the system

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