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Analysis method and system for time distribution characteristics of flue gas in flue and denitration system

A technology of time distribution and characteristic analysis, which is applied in the field of boiler combustion, can solve problems such as the inability to determine the time distribution characteristics of flue gas, flue gas parameter prediction, etc., and achieve the effects of precisely controlling the amount of ammonia injection, reducing the dimension, and reducing the amount of calculation

Active Publication Date: 2019-09-20
HUADIAN POWER INTERNATIONAL CORPORATION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only takes the adjustable parameters on the furnace side as input and the NOx concentration at the furnace outlet as output, and does not predict other flue gas parameters such as flue gas flow rate, and does not consider other factors affecting flue gas parameters, and cannot determine the flue gas Time distribution characteristics in the flue

Method used

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  • Analysis method and system for time distribution characteristics of flue gas in flue and denitration system

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Embodiment 1

[0068] Such as figure 1 As shown, a method for analyzing the time distribution characteristics of flue gas in a flue, comprising steps:

[0069] S1. Determine the data of boiler flue gas parameters;

[0070] S2. Establishing a flue gas parameter change law model;

[0071] S3. Obtain the time distribution characteristics of the flue gas in the flue.

[0072] In step S1, the boiler flue gas parameters include at least one of flue gas flow rate, nitrogen oxide concentration, and nitrogen oxide generation amount.

[0073] Determining the flue gas flow comprises the steps of:

[0074] S111. Determine the average carbon content in the ash and the percentage b of the coal ash content and the excess air coefficient apy;

[0075] S112. Determine the theoretical dry air volume Vgkb according to b;

[0076] S113. Determine the theoretical dry flue gas volume Vgyb according to the Vgkb;

[0077] S114. Determine the dry flue gas volume Vgy according to the theoretical dry air volume,...

Embodiment 2

[0114] A system for analyzing the time distribution characteristics of flue gas in a flue, the system includes a processor and a storage medium, the storage medium stores a program, the program is run by the processor, and the program executes the flue gas in the flue Gas time distribution characteristic analysis method, described method comprises the steps:

[0115] S1. Determine the data of boiler flue gas parameters;

[0116] S2. Establishing a flue gas parameter change law model;

[0117] S3. Obtain the time distribution characteristics of the flue gas in the flue.

[0118] Also stored in the storage medium are factors that affect the amount of nitrogen oxides produced during combustion of the boiler and historical operating data of each factor. The factors include unit load, total coal volume, coal quality, total air volume, hot primary air Air volume, hot primary air volume main pipe pressure, hot primary air volume damper opening, secondary air box pressure, secondary...

Embodiment 3

[0122] There are many factors that affect the amount of nitrogen oxides generated during boiler combustion, and the influence of each factor is relatively complicated. If all the influencing factors are analyzed to establish a model for the change of flue gas parameters, the analysis is very difficult and the amount of data calculation is huge. , so the gray correlation degree analysis method is firstly used to determine the set of factors that have the greatest influence on the flue gas parameters during boiler combustion.

[0123] The historical operation data of each unit is stored in the flue gas time distribution characteristic analysis system in the flue, and the historical operation data of the unit is selected for a period of time, and it is confirmed that the unit is in a stable operation stage during this period of time.

[0124] Taking the concentration of nitrogen oxides in the flue gas parameters as an example, the specific process of establishing a flue gas parame...

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Abstract

The invention provides an analysis method and system for time distribution characteristics of flue gas in a flue and a denitration system. The method comprises the following steps: determining theoretical data of boiler flue gas parameters, establishing a smoke parameter change rule model, and obtaining the time distribution characteristic of the flue gas in the flue. The established flue gas parameter change rule model and the determined time distribution characteristic of the flue gas in the flue can serve as control signals of the SCR denitration system, and the purpose of accurately controlling the ammonia spraying amount is achieved; meanwhile, support can be provided for denitration analysis of parameters of the same flue gas, it is guaranteed that all data of the same flue gas are analyzed, and the analysis precision is improved.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a method, system and denitrification system for analyzing the time distribution characteristics of flue gas in a flue. Background technique [0002] During the combustion process of coal-fired boilers, a large amount of nitrogen oxides are produced. The country has formulated air pollutant emission standards for different industries. In order to meet the emission standards of air pollutants and reduce nitrogen oxide emissions, many boilers are equipped with denitrification systems. At present, large-scale boilers, especially coal-fired boilers in thermal power plants, basically use selective catalytic reduction (SCR) denitrification technology. A catalyst is installed in the denitrification reactor, and a certain reducing agent ammonia (NH 3 ), under the action of catalyst, the reducing agent NH 3 Selectively react with nitrogen oxides in flue gas to form N 2 and H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B01D53/86B01D53/50
CPCB01D53/8609B01D2258/0283G06F30/20
Inventor 张海燕徐劲松陈令强张波孟凡亮周虎周海涛
Owner HUADIAN POWER INTERNATIONAL CORPORATION LTD