SNCR denitration automatic control method and system thereof

Abstract

The invention discloses an SNCR denitration automatic control method and a system thereof. The method comprises the steps 1-5. The system comprises a control module, an ammonia water pump, a nitrogenoxide collection module and a PID function module, wherein the control module is internally provided with a timing module and a data processing module; full-automatic control of an SNCR system can beachieved; on the premise that nitric oxide is controlled to meet the environmental protection requirement, nitric oxide control does not exceed the standard and is not too low; an ammonia water control mode and a nitrogen oxide control mode can be automatically switched without disturbance; the ammonia water spraying amount is calculated according to the nitrogen oxide content and the formula thatthe ammonia water flow set value = the ammonia water flow set value at the last moment + / - the ammonia water step length, and the automatic tracking control of the nitrogen oxide is controlled by automatically adjusting the ammonia water spraying amount; manual intervention is reduced, the manual adjustment frequency is reduced, the workload of operators is reduced, and the working efficiency isimproved; the denitration efficiency is improved, the adjusting time is optimized, ammonia water is saved, and the defects caused by the prior art are overcome.

Description

technical field [0001] The invention relates to flue gas denitrification, in particular to an automatic control method and system for SNCR out-of-stock. Background technique [0002] The process of removing nitrogen oxides from combustion flue gas and the importance of preventing environmental pollution have been sharply raised as worldwide problems. The more mainstream processes in the world are divided into: Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR, full name SelectiveNon-Catalytic Reduction). There is not much difference between these two processes except that the reaction temperature of SCR is lower than that of SNCR due to the use of catalysts in SCR. Using SNCR method for denitrification, reducing agent is the largest consumable (but for SCR denitrification, the consumption of catalyst is more). [0003] Such as figure 2 As shown, the existing cement plants (cement production line building materials, steel, electric power, pe...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the automation degree of the existing SCNR system is too low, has certain limitations, poor stability, poor flexibility, and high cost. The present invention provides an SNCR out-of-stock automatic control method, which can realize The SNCR system is fully automated, and under the premise of controlling nitrogen oxides to meet environmental protection requirements, the nitrogen oxides control does not exceed the standard, but is not too low;

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