Method for evaluating the denitration capability of an SCR reactor

Abstract

The invention discloses a method for evaluating the denitration capacity of an SCR reactor. The method comprises the following steps: carrying out pretreatment; obtaining historical data of each measuring point of the unit from a data source; performing data preprocessing and outputting; the inlet NOx concentration is subjected to oxygen correction, and calculating the ammonia consumption for removing unit NOx; dividing temperature and outlet NOx concentration working conditions and selecting typical working conditions; and fitting an ammonia consumption curve for removing the unit NOx, carrying out corresponding conversion, determining an upper limit according to the calculated corresponding relation between the ammonia consumption for removing the unit NOx and the ammonia escape rate, and evaluating the denitration capability of the SCR reactor by combining the slope of the trend line and the upper limit. According to the evaluation method for the denitration capability of the SCR reactor, provided by the invention, steady-state tracking and self-adaptive correction calculation can be realized.

Description

technical field [0001] The invention belongs to the technical field of coal-fired denitrification, and in particular relates to a method for evaluating the denitrification ability of an SCR reactor, which macroscopically evaluates the denitrification ability and catalyst life of the SCR reactor based on unit operation data. Background technique: [0002] In the coal-fired boiler SCR system, catalyst deactivation is inevitable. Harmful elements such as alkali metals and arsenic in flue gas can cause catalyst poisoning, and catalyst sintering, pore blockage and wear will affect catalyst life. The denitrification catalyst can be used for a long time under ideal conditions, but in the actual use of power plants, the actual performance of the catalyst is often limited by the operating conditions, and its service life is ever-changing. Recently, the country has become more and more stringent on the NOx emission control of coal-fired power plants. To achieve "ultra-low emissions",...

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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies in the existing methods, the present invention provides an evaluation method for the denitrification capacity of the SCR reactor according to the current national requirements for "ultra-low emission" of NOx in coal-fired power plants, and ensures NOx discharge at the outlet of the unit When the concentration meets the requirements, based on the big data of the unit, the degradation analysis and life prediction of the catalyst of the SCR reactor of the unit are carried out. This method is based on the historical operation data of the unit, and the ammonia consumption per unit of NOx removal is proposed as the denitrification capacity of the new reactor. The evaluation index ensures that the NOx emission concentration at the outlet of the unit meets the requirements, and the degradation analysis and life prediction of the catalyst of the SCR reactor of the unit are carried out, which meets the needs of the project and avoids the problem that the traditional laboratory method cannot reflect the actual flue gas flow field , and also avoid the time-consuming and labor-intensive laboratory tests, and give full play to the advantages of big data of the unit

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