Denitration and ammonia spraying control system for W-flame boiler and method thereof

A control method, boiler technology, applied in the direction of control/regulation systems, separation methods, flow control, etc.

Pending Publication Date: 2021-02-05
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of denitrification control of W flame

Method used

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  • Denitration and ammonia spraying control system for W-flame boiler and method thereof
  • Denitration and ammonia spraying control system for W-flame boiler and method thereof

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Experimental program
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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] refer to figure 1 , the W flame boiler denitration ammonia injection control system of the present invention includes SCR inlet NO x Concentration module 1, SCR outlet NO x Concentration setting module 2, SCR outlet NO x Concentration module 3. Boiler real-time flue gas flow calculation module 4. Ammonia flow module 5. Boiler combustion state variable module 6. NO that needs to be removed theoretically x Quantity module 7, combustion state estimation controller 8, static deviation controller 9, theoretical ammonia nitrogen molar ratio module 10, arithmetic operator module 11, ammonia flow controller 12 and ammonia flow regulating valve 13. The ammonia gas flow module 5, the theoretical ammonia-nitrogen molar ratio module 10, the arithmetic operator module 11, the ammonia flow controller 12 and the ammonia flow regulating valve 13 form an "ammonia in...

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Abstract

The invention discloses a denitration and ammonia spraying control system for a W-flame boiler and a method thereof. The system comprises an SCR inlet NOx concentration module, an SCR outlet NOx concentration setting module, an SCR outlet NOx concentration module, a boiler real-time flue gas flow calculation module, an ammonia gas flow module, a boiler combustion state variable module, an NOx quantity module theoretically needing to be removed, a combustion state estimation controller, a static deviation controller, a theoretical ammonia-nitrogen molar ratio module, an arithmetic operator module, an ammonia flow controller, and an ammonia flow regulating valve. A control strategy of a feedforward loop, an estimation loop, and a feedback loop is set, and a state estimation controller, an NOx quantity module theoretically needing to be removed and a static deviation controller are correspondingly arranged. According to the control method, denitration optimization control and precise ammonia spraying of the W-flame boiler can be achieved in any DCS and any external system configuration of the DCS, and partition dynamic precise ammonia spraying optimization can be achieved in cooperation with SCR partition.

Description

technical field [0001] The invention belongs to the technical field of thermal power unit process control and automation, and relates to a control system and method for denitrification and ammonia spraying of a W flame boiler. Background technique [0002] The ultra-low emission transformation of large thermal power units has been basically completed. Due to reasons such as the design coal type of W flame units, NO x The original emission concentration is very high, most of which exceed 1000mg / m 3 , so the mainstream denitrification process of SNCR+SCR is basically adopted, and the SCR denitrification reactor is arranged according to the "3+1" mode. Even so, most W flame boiler denitrification systems still have NO x The control effect is not ideal, and even some thermal power units, the automatic control of denitrification and ammonia injection cannot be put into normal operation, resulting in NO x Emissions cannot be stably controlled at 50mg / m 3 Within the ultra-low em...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/78B01D53/56G05D7/06
CPCB01D53/8631B01D53/78B01D53/56G05D7/0635B01D2258/0283B01D2251/2062
Inventor 武宝会
Owner XIAN THERMAL POWER RES INST CO LTD
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