1000MW ultra-supercritical tower-type furnace advanced denitration running method

Abstract

The invention relates to a 1000MW ultra-supercritical tower-type furnace advanced denitration running method. The method comprises the following steps that S1, 80%-95% of air amount needed by combustion is fed in from a spraying opening of a lower layer main combustion zone, and the air amount in the lower layer main combustor zone is controlled to be small than the air amount needed by complete combustion; and S2, 25%-35% of air amount needed by combustion is fed in from a spraying opening in the upper portion of a combustor, the air amount of a hearth upper layer after-combustion zone is controlled to be larger than the air amount needed by complete combustion. During blending combustion of coal types with different heating amounts, the method can guarantee reasonable lower layer main combustion zone anoxycausis and upper layer after-combustion zone oxygen-enriched combustion manners by automatically controlling secondary air baffles, conversion of volatile matter nitrogen to NOx is reduced, the concentration of the NOx at an SCR inlet is reduced to 160 mg / Nm<3> to 190 mg / Nm<3> from 230 mg / Nm<3> to 280 mg / Nm<3>, and the nitrogen spraying amount is reduced to 80 mg / Nm<3> to 100 mg / Nm<3> from 130 mg / Nm<3> to 180 mg / Nm<3>.

Description

technical field [0001] The invention relates to the technical field of power plant equipment, in particular to an advanced denitrification operation method for a 1000MW ultra-supercritical tower furnace. Background technique [0002] At present, the control of NOx emissions from thermal power plants has been included in the national environmental protection rigid targets. All power plants have simultaneously designed and installed denitrification devices on 1000MW ultra-supercritical coal-fired units, and adopted selective catalytic reduction method for flue gas denitrification. The cost of liquid ammonia accounts for 93.2% of the operating cost of denitrification, so reducing the cost of liquid ammonia reduces the cost of denitrification. In addition, liquid ammonia is a high-risk chemical product, which poses great risks to people and the environment during storage, transportation, and use. The high NOx content at the inlet of the denitrification system leads to high ammo...

AI Technical Summary

Problems solved by technology

Disadvantages: the control system is more complicated, and the theory of air staged combustion technology is not considered reasonably

Therefore, it is impossible to reasonably and effectively control and reduce the amount of NOx generated; there are other secondary air baffle automatic control technologies, but during use, it is found that the air volume at the SOFA measuring point is unreliable and cannot be adjusted normally; other secondary air baffle adjustment schemes are not satisfactory Actual situation on site

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