Boiler denitration system inlet flue gas temperature adjusting system and method

Abstract

The invention discloses a boiler denitration system inlet flue gas temperature adjusting system and method. The system comprises a boiler tail vertical flue, a denitration inlet flue and a tail horizontal flue connected between the boiler tail vertical flue and the denitration inlet flue; the tail horizontal flue is provided with a first adjusting baffle; a bypass flue is additionally connected between the boiler tail vertical flue and the denitration inlet flue; the cross section of the bypass flue is covered with a steam heater and a second adjusting baffle; and the second adjusting baffle is located on the upstream of the steam heater. The flue gas temperature of a denitration system inlet can be flexibly adjusted, the problem that a denitration system cannot be put into use due to the low flue gas temperature of the inlet is effectively solved, the denitration system can be normally put into use of a boiler in an extremely low load or ignition period, the heat absorption proportion of a water heating surface and a steam heating surface is not influenced, and full-working-condition denitration system putting into a unit is realized, so that relatively high social benefits and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a flue gas temperature adjustment system and method at the inlet of a boiler denitrification system. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Due to the needs of power grid regulation and absorption of new energy power generation, existing thermal power generating units often need deep peak regulation for long-term low-load operation. At this time, the flue gas temperature at the inlet of the denitrification system will become lower, which cannot reach the minimum allowable input of the denitrification system. Temperature conditions, if the flue gas temperature is not adjusted in time, it will cause the denitrification system to exit and the nitrogen oxides NO emitted X Exceeding the standard will trigger the environmental...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a flue gas temperature adjustment system and method at the inlet of the boiler denitrification system, which can flexibly adjust the flue gas temperature at the inlet of the denitrification system, and effectively solve the problem of denitrification due to the low temperature of the inlet flue gas. The system cannot be put into use, so that the boiler can normally use the denitrification system when the load is extremely low or during ignition, without affecting the heat absorption ratio of the water and steam heating surfaces, and the denitrification system can be put into use in the whole working condition of the unit, which has a high efficiency social and economic benefits

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