Ammonia water spraying flow control system and control method thereof
A flow control and ammonia flow technology, which is applied in the direction of flow control using electrical devices, separation methods, chemical instruments and methods, etc., can solve the problems of low control accuracy and large errors, and achieves improved real-time performance, improved control speed, and shortened The effect of adjusting the timing of the results
Inactive Publication Date: 2021-09-17
SHANXIN SOFTWARE CO LTD
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[0004] The application provides an ammonia water spraying flow control system and its control method to solve the technical problems of low control accuracy and large error in controlling the ammonia water spraying flow
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[0031] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0032] In order to facilitate the implementation of the technical solution of the application, some concepts involved in the application are firstly described below.
[0033] The concentration of nitrogen oxides in the original flue gas is the concentration of nitrogen oxides in the flue gas that has not been denitrated, the concentration of ...
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The embodiment of the invention provides an ammonia water spraying flow control system, which comprises a model prediction controller, and an original flue gas nitrogen oxide concentration detection device, an outlet flue gas nitrogen oxide concentration detection device, a flue gas flow detection device, an ammonia escape concentration detection device, a reactor temperature detection device, an ammonia spraying flow detection device, a programmable logic controller and a variable-frequency ammonia spraying pump which are in communication connection with the model prediction controller. According to the invention, the model prediction controller adjusts a model according to the detection values of the original flue gas nitrogen oxide concentration, the outlet flue gas nitrogen oxide concentration, the flue gas flow, the ammonia escape concentration, the reactor temperature, the ammonia spraying flow and the ammonia spraying flow of the variable-frequency ammonia spraying pump and the adjustment result, obtained by the model prediction controller, of the variable-frequency ammonia spraying pump, so that the control precision of the ammonia water spraying flow is improved.
Description
technical field [0001] The present application relates to the field of selective catalytic reduction denitrification, in particular to an ammonia water spraying flow control system and a control method thereof. Background technique [0002] In order to prevent excessive nitrogen oxides from polluting the environment after coal combustion in the boiler, the coal should be denitrified. In the field of flue gas denitrification, the selective catalytic reduction method is widely used to denitrify coal. The selective catalytic reduction method is a process with mature technology and good effect. Too little ammonia water spraying flow will cause nitrogen oxides in the sintering flue gas to react with ammonia and there will be residual nitrogen oxides in the sintering flue gas, resulting in low denitrification efficiency and excessive nitrogen oxide emissions. Excessive injection of ammonia will lead to excess ammonia consumed by the reduction reaction, and the ammonia escape rate...
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IPC IPC(8): B01D53/90B01D53/56G05D7/06
CPCB01D53/90B01D53/8625B01D53/346G05D7/06B01D2258/0283B01D2251/2062
Inventor 李春雷王云彪付春钢靖长续韩雪商桂梅杨桢
Owner SHANXIN SOFTWARE CO LTD