Ammonia spraying optimization control method and system for SCR flue gas denitrification device

A technology for optimizing control and control systems, applied in the direction of control/regulation systems, flow control using electrical devices, chemical instruments and methods, etc., can solve the uneven velocity field, the influence of ammonia/nitrogen molar ratio, and the increase of ammonia escape from the reactor outlet. and other problems to achieve the effect of accurate and comprehensive representativeness of measurement data.

Pending Publication Date: 2020-07-03
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited space of the venue, the effect is not high
So take to increase the SCR system entrance NO x The number of concentration measurement probes has been changed from one sampling probe to three sampling probes, and multi-point flue gas mixed sampling, but these methods still make the SCR system inlet NO x Concentration measurement data is still not representative, and the actual concentration of the entire flue cross-section cannot be measured
At the same time, the ammonia injection control system still uses a regulating valve for adjustment, which cannot meet the needs of different ammonia injection volumes in various areas of the flue cross section, resulting in uneven ammonia / nitrogen molar ratio. If it is too large, ammonia cannot fully participate in the reaction, and ammonia escapes from the reactor outlet. Increase; if it is too small, the amount of ammonia injection will be insufficient, NO x Not all of the reaction can be reduced and absorbed, causing the emission concentration to exceed the standard
The inhomogeneity of the velocity field also has some influence on the ammonia / nitrogen molar ratio, which cannot be corrected by the control logic

Method used

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  • Ammonia spraying optimization control method and system for SCR flue gas denitrification device
  • Ammonia spraying optimization control method and system for SCR flue gas denitrification device
  • Ammonia spraying optimization control method and system for SCR flue gas denitrification device

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Embodiment 1

[0045] see figure 1 An ammonia injection optimization control system for an SCR flue gas denitrification device provided in Embodiment 1 of the present invention is characterized in that the flue cross section is meshed based on the grid method to obtain the sampling area of ​​the flue cross section. For inlet flue NO x Concentration zone measurement and flue gas flow zone measurement, outlet flue NO x Concentration zone measurement, and ammonia injection in corresponding zones of the inlet flue, the system includes: inlet flue gas sampling device 1, inlet flue gas flow pressure measuring device 2, transmitter 3, inlet switching valve 4, inlet flue Ammonia injection branch valve 5, inlet flue ammonia injection main valve 7, inlet flue ammonia injection main pipe flowmeter 8, inlet flue gas analysis and control device 6, outlet flue gas sampling device 10, outlet switching valve 11 , outlet flue gas analysis and control device 12, DCS control system 9, wherein,

[0046] The ...

Embodiment 2

[0075] Corresponding to the ammonia injection optimization control system of the SCR flue gas denitrification device disclosed in the first embodiment of the present invention, the second embodiment of the present invention also provides a method for the optimization control system of the ammonia injection of the SCR flue gas denitrification device, see Figure 4 , the method includes:

[0076] S11. Carry out grid division on the inlet and outlet flue cross sections based on the grid method to obtain multiple grid sampling areas;

[0077] S12. Pretreat the flue gas sampled from the inlet flue, and take turns to measure the flue gas, and obtain the NO of the inlet flue. x Concentration partition measurement value;

[0078] S13. Simultaneously measure the flue gas flow in the inlet flue in different zones;

[0079] S14. Pretreat the flue gas sampled from the outlet flue, and take turns to measure the flue gas, and obtain the NO of the outlet flue. x Concentration partition me...

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Abstract

The invention discloses an ammonia spraying optimization control method and system for an SCR flue gas denitrification device. The control method comprises the following steps: dividing an inlet flueand an outlet flue into grids; matching the grids with the inlet flue and the outlet flue one-by-one; sampling each inlet flue grid and each outlet flue grid respectively; by sampling each corresponding inlet flue grid and outlet flue grid, analyzing and calculating a DCS (Distributed Control System) and carrying out partitioned ammonia spraying control on the total ammonia spraying amount and each corresponding inlet flue grid area according to a calculation result. Partitioned differential control of ammonia spraying is realized, over-spraying and under-spraying of ammonia are reduced, the ammonia escape rate is reduced, energy is saved, consumption is reduced, and the safety of a unit is improved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to an ammonia injection optimization control system and method for an SCR flue gas denitrification device. Background technique [0002] The people's requirements for a beautiful environment are gradually increasing. In order to meet the people's needs for a better life, the state has also introduced a series of policies and measures to encourage thermal power plants to implement ultra-low emission transformation. In the denitrification transformation, some positive measures have also been taken. The first is to further optimize the design and transformation of the flow field to ensure the flue gas flow rate and NO x Uniformity of concentration distribution. However, due to the limited space of the site, the effect is not high. So take to increase the SCR system inlet NO x The number of concentration measurement probes has been changed from one sampling probe to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56G05D7/06G01N1/22G01F1/34G01N33/00
CPCB01D53/346B01D53/8625B01D53/90B01D2251/2062B01D2258/0283G01F1/34G01N1/2258G01N33/0037G05D7/0635
Inventor 张承武杨爱勇韦飞冯建春宣添星舒喜王敏潘云张亚伟
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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