A Cluster SNCR Control Method Based on Flow Field in Furnace

Abstract

The invention belongs to a denitrification control technology in a power generation process, and particularly relates to a clustered SNCR (selective non-catalytic reduction) control method based on a flow field in a furnace under flow field conditions of a power plant furnace. According to the clustered SNCR control method based on a flow field in a furnace, a denitrification system optimization and control center and a reducer spray quantity control system are included, wherein the denitrification system optimization and control center obtains a reducer spray quantity via a fuzzy reasoning intelligent control algorithm according to NOx concentration deviation ei at the outlet of an SNCR system and the deviation change thereof Delta e, and sends the reducer spray quantity to the reducer spray quantity control system; and after receiving the reducer spray quantity of the denitrification system optimization and control center, the reducer spray quantity control system performs calculation to obtain a real-time reducer spray quantity in combination with a furnace temperature, a spray burner operation state, a fume quantity and a unit load, and sends the real-time reducer spray quantity to a spray gun set, thereby realizing real-time reducer spraying.

Description

technical field [0001] The invention belongs to the denitrification control technology in the power generation production process, and specifically relates to a cluster SNCR control method based on the flow field in the furnace by utilizing the flow field conditions in the furnace of a power plant. Background technique [0002] The denitrification control of the boiler must be involved in the power generation production process. At present, there are problems of poor cooperation between SNCR and SCR and low denitrification efficiency of SNCR. The main reasons are: 1. SNCR cannot adjust the ammonia injection amount of reducing agent in time according to the change of SCR catalyst activity; 2. The real-time injection amount and injection concentration of SNCR reducing agent are based on It is relatively simple, so the amount of reductant injection in some areas is insufficient or excessive, and the mixing of NOx and reductant is uneven. In addition, some external conditions s...

AI Technical Summary

Problems solved by technology

At present, there are problems of poor cooperation between SNCR and SCR and low denitrification efficiency of SNCR. The main reasons are: 1. SNCR cannot adjust the ammonia injection amount of reducing agent in time according to the change of SCR catalyst activity; 2. The real-time injection amount and injection concentration of SNCR reducing agent are based on It is relatively single, so the amount of reducing agent injection in some areas is insufficient or excessive, and the mixing of NOx and reducing agent is uneven

In addition, some external conditions such as the narrow temperature window for the reaction of NOx and reducing agent, and the escape of reducing agent due to the load of the unit are also the reasons for the low flue gas denitrification efficiency.

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