Low-load system increasing denitration flue gas temperature

Abstract

The invention relates to a low-load system increasing the inlet flue gas temperature of a boiler denitration device. The system comprises two boiler tail vertical flues, and bypass flues are arranged on the two boiler tail vertical flues, are communicated and are provided with flue baffles. Compared with the prior art, the two boiler tail vertical flues are directly provided with the bypass flues capable of being communicated, when one boiler is at the start-up stage or at the low-load operation stage, the bypass flues can be opened, partial high-temperature flue gas of the one in normal operation of the two boiler tail vertical flues enters the tail vertical flue of the boiler at the low-load operation stage, and therefore the inlet flue gas temperature of the denitration device can be increased, and the NOx emission in flue gas can reach the standard. The system is flexible to operate, can meet various complex operation conditions of power plants and can guarantee that the denitration inlet flue gas temperature can meet the requirement no matter which one unit is at the low-load stage or at the start-up stage.

Description

technical field [0001] The invention relates to a system for increasing the flue gas temperature at the inlet of a boiler denitrification device under low load. Background technique [0002] At present, with the continuous improvement of the national environmental protection requirements, people pay more and more attention to the NOx emissions in the flue gas. The Reply to the Issues (Huanhan [2015] No. 143) stated: "The thermal power plant must meet the emission standards at any operating load. The nitrogen oxide emission concentration caused by the inability of the denitrification system to operate is higher than the emission limit requirements. , should be identified as excessive emissions and be punished according to law.” According to the above requirements, there is an urgent need for a system that can quickly increase the flue gas temperature at the inlet of the boiler low-load denitrification device. Contents of the invention [0003] The technical problem to be s...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the existing boiler flue is directly connected to the denitrification device. When the boiler is in the stage of starting the furnace or operating at low load, the inlet flue gas temperature of the denitrification device is low, and the NO in the flue gas X The emission is not up to the standard. In order to solve the above problems, a low load system is provided to increase the temperature of the denitrification flue gas.

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