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A precise control method for high-efficiency denitrification ammonia flow

A technology for precise control and ammonia flow, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as low reliability, large lag, and difficult debugging of advanced denitrification control systems

Active Publication Date: 2021-05-04
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a precise control method for high-efficiency denitrification ammonia flow, which can effectively solve the problem of large lag in the process of SCR denitrification, the problem of low system control accuracy when CEMS data has bad points, and the problem of advanced denitrification The control system is difficult to debug, the reliability is low, and the parameters need to be calculated and updated in real time, which is not suitable for engineering applications.

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  • A precise control method for high-efficiency denitrification ammonia flow
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Embodiment Construction

[0029] A precise control method for high-efficiency denitrification ammonia flow, which combines fuzzy control, intelligent model weighting algorithm and fuzzy PID, including the following steps:

[0030] (A) Determine the operating status of the boiler according to the unit load command and variable load rate;

[0031] (B) If the unit is running in a variable load state, call the fuzzy control system;

[0032] (C) If the unit is running at constant load, call the improved cascade control system;

[0033] In step (A), specifically include:

[0034] Directly read unit load command from DCS. When the unit load changes beyond a certain range (tentatively 5-10%), the unit is considered to be in a state of variable load, otherwise, the unit is considered to be operating in a state of constant load.

[0035] In step (B), specifically include:

[0036] (B1) Directly read the unit load command, variable load rate, and NOx value at the denitrification inlet from the DCS, input it i...

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Abstract

The invention discloses a precise control method for high-efficiency denitrification ammonia flow, which determines the operating state of the boiler according to the unit load command and variable load rate: when the unit is operating in a variable load state, the fuzzy control system is invoked; when the unit is operating in a constant load state, Call for an improved cascade control system. The invention introduces the chimney analysis instrument data into the control system to ensure that the assessment of environmental protection and denitration is up to standard, and introduces a fuzzy control method and a data preprocessing mechanism to solve the problem of large lag in the current control system and the problem of low system control accuracy when CEMS data has bad points. Thereby, the control quality of the denitration control system is improved, and it is suitable for high-efficiency denitration. The invention can effectively solve the problem of large lag in the SCR denitrification process, the problem of low system control accuracy when CEMS data has bad points, and the difficulty in debugging the advanced denitrification control system, low reliability, and the need for real-time calculation and update of parameters. Problems suitable for engineering applications.

Description

technical field [0001] The invention belongs to the technical field of environmental protection denitrification, and in particular relates to a method for precisely controlling the flow rate of highly efficient denitrification ammonia. Background technique [0002] SCR denitrification refers to the use of amino reducing agents to "selectively" react with NOx in the flue gas under the action of an appropriate reaction temperature window and a catalyst to generate harmless N 2 and H 2 O. SCR denitrification of thermal power units adopts high-dust arrangement, and the reaction temperature range is 320°C to 420°C. SCR denitrification has become the most mature and widely used flue gas denitrification technology for thermal power plants due to its high denitrification efficiency, stable and reliable operation, and no secondary pollution of products. [0003] The current common SCR denitrification closed-loop control strategy adopts a fixed SCR outlet NOx concentration control ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/56
Inventor 樊万梅王进王静张晶辉周强
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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