Intelligent precise SNCR (selective non-catalytic reduction) denitration system and denitration method

Abstract

The invention relates to the technical field, and discloses an intelligent precise SNCR denitration system and a denitration method.The system comprises a reducing agent receiving and storing system, a dilution mixing control system, a boiler spraying system, a discharging system after mixed denitration reaction and a diluent recycling and reusing system; the method comprises the following steps: receiving and storing a reducing agent, mixing and diluting the reducing agent, denitrifying in the boiler, discharging after mixed denitrification reaction, and recycling and reusing the diluting agent. Urea in an accurate proportion is discharged into the metering tank through the flow electric control valve in the storage tank and is input into the mixing tank through the first pump set, the intelligent proportioning system discharges softened water in a certain proportion into the mixing tank through the fourth pump set, and the softened water and the urea are fully mixed in the mixing tank through work of the stirring device.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to an intelligent and precise SNCR denitration system and a denitration method. Background technique [0002] Flue gas is one of the main emissions of thermal power plants, which is produced by the combustion of combustibles in boilers. Since the flue gas usually contains a large amount of nitrogen oxides such as nitric oxide, if these nitrogen oxides are directly discharged into the atmosphere, it will cause highly corrosive acid rain, so the flue gas must be denitrified before being discharged. [0003] Traditionally, the SNCP denitrification system is used for denitrification work, but when the reducing agent and water required for denitrification are mixed into a diluent, the mixing effect is poor, resulting in the inability to perform a better denitrification reaction when the diluent is mixed with flue gas. And the diluent is concentrated when spraying in the react...

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Problems solved by technology

[0003] Traditionally, the SNCP denitrification system is used for denitrification work, but when the reducing agent and water required for denitrification are mixed into a diluent, the mixing effect is poor, resulting in the inability to perform a better denitrification reaction when the diluent is mixed with flue gas. And the diluent is concentrated when spraying in the reaction boiler. A large amount of spraying is carried out through several nozzles. The amount of spraying is large and concentrated, and the flue gas cannot be in good contact with the diluent, resulting in poor reaction effect. , and a large amount of diluent will fall into the bottom of the reaction furnace without mixing with the flue gas, resulting in a certain amount of waste. Therefore, an intelligent and precise SNCR denitrification system and denitrification method are proposed

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