System and method for monitoring and dynamically regulating and controlling flow field distribution in denitration link of coal-fired power plant

Abstract

The invention relates to a system and method for monitoring and dynamically regulating and controlling flow field distribution of a denitration link of a coal-fired power plant, and belongs to the field of SCR denitration of the coal-fired power plant. The system comprises a denitration reactor and a flue, the flue is connected with the denitration reactor; the structure is characterized in that the system further comprises an ammonia spraying grid and a rectifying grid, the ammonia spraying grid is mounted in the flue; the rectifying grid is arranged in the denitration reactor; a first-layercatalyst is arranged in the denitration reactor; a first flow guide plate, a second flow guide plate, a third flow guide plate, a fourth flow guide plate, a fifth flow guide plate and a sixth flow guide plate are sequentially arranged in the flue and the denitration reactor along the flowing direction of the flue gas; wherein a first dust-easy-to-deposit area and a third dust-easy-to-deposit areaare in the flue, a second dust-easy-to-deposit area and a fourth dust-easy-to-deposit area are in the denitration reactor, a first flow velocity monitoring section is arranged in the flue, and the denitration reactor is provided with a second flow velocity monitoring section and a flow direction monitoring section.

Description

technical field [0001] The invention relates to a system and method for monitoring and dynamically regulating the flow field distribution in the denitrification link of a coal-fired power plant, belonging to the field of SCR denitrification in a coal-fired power plant. Background technique [0002] Selective Catalytic Reduction (SCR) is commonly used in coal-fired power plants to remove NOx from flue gas. After the flue gas comes out of the economizer at the rear of the furnace, it flows through the ammonia injection grid (Ammonia Injection Grid, referred to as "AIG"), and mixes with the reducing agent (such as ammonia gas) injected here, and continues to flow to the denitrification reaction device. The flue gas flows through the multi-layer catalyst in the denitrification reactor. Under the action of the catalyst, NOx and NH 3 react to form N 2 and H 2 O, to complete the denitrification reaction. The flow field distribution and its uniformity have a significant impact ...

AI Technical Summary

Problems solved by technology

Domestic patent "Optimization and adjustment method for SCR denitrification system of coal-fired power station based on CFD", patent number CN104474896B, using computational fluid dynamics (CFD) to analyze the flow field and NH 3 The real-time calculation of the concentration field and the guidance of the DCS to control the flow rate of ammonia injection have the advantage of making full use of advanced numerical simulation methods, but the disadvantage is that the real-time CFD calculation is not feasible and operable in actual production, and the technical level of personnel is required High, and the invention does not involve flow field monitoring and regulation

Domestic patent "system and method for determining air entrapment in ladle", patent application number 201910163165.3, proposes to use transient CFD to simulate the tapping process of liquid steel and calculate the amount of air entrapment, and the formed data set is used for training Artificial neural network, the trained artificial neural network model is used to predict the air interception under new input parameters, but its artificial neural network model is only used for result prediction, not used to guide the adjustment of production process parameters, the invention It does not aim at adjusting the technological parameters of the production process so as to optimize the production output results, nor does it have the function of this aspect, and the production field applicable to this invention is also obviously different from the present invention

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