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Soft measuring method for large boiler oxygen content in exhaust smoke

A large-scale boiler and oxygen content technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as uneven distribution of oxygen content in flue gas, poor dynamic characteristics, and increased possibilities

Inactive Publication Date: 2007-10-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) Low measurement accuracy
Affected by the accuracy of the sensor itself, the uneven distribution of flue gas oxygen content, and the air leakage at the installation place, the measurement accuracy is not easy to guarantee, and the comprehensive error is 2%O 2 about
[0005] (3) Poor dynamic characteristics
The zirconia oxygen meter works on the principle of a concentration cell. Oxygen molecules have a process of penetration in the zirconia dielectric, resulting in a large measurement lag.
In order to reduce fly ash wear, many oxygen meter probes are equipped with ceramic protective sleeves, but this increases the possibility of ash blocking and increases the measurement lag
[0006] (4) Difficulty in overhaul, maintenance and calibration

Method used

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  • Soft measuring method for large boiler oxygen content in exhaust smoke
  • Soft measuring method for large boiler oxygen content in exhaust smoke
  • Soft measuring method for large boiler oxygen content in exhaust smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Embodiment: a kind of soft measuring method of oxygen content in flue gas of large-scale boiler, it comprises the following steps:

[0035] A. Approve the accuracy of the original signal

[0036] serial number

signal name

unit

the symbol

1

main steam temperature

℃

t s

2

main steam pressure

MPa

p s

3

Feed water temperature

℃

t w

4

main steam flow

Kg / s

q s

5

reheat steam temperature

℃

t r

6

reheat steam pressure

MPa

p r

7

High pressure cylinder exhaust temperature

℃

t l

8

exhaust temperature

℃

t p

9

cold air temperature

℃

t 0

10

Boiler total air volume

m 3 / s

V a

11

Drum pressure

MPa

p d

12

fuel flow

Kg / s ...

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PUM

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Abstract

A soft method for measuring oxygen content in smoke discharged from large capacity boiler includes checking accuracy of original signal, confirming heat ratio of coal to air, calculating heat amount generated by fuel burning, calculating dynamic heat quantity and calculating oxygen content in smoke discharged from said boiler.

Description

technical field [0001] The invention belongs to the field of measuring boiler thermal parameters, in particular to a method for real-time measuring the oxygen content in the exhaust smoke of a large boiler. Background technique [0002] The oxygen content of the boiler flue gas directly reflects the air-to-coal ratio of the boiler combustion process, and is an important indicator related to the combustion economy, and is also an important controlled parameter in the boiler thermal automation. At present, most large boilers use a built-in zirconia oxygen meter to measure the oxygen content of the boiler exhaust gas, but the usage is not ideal. The main problems are: [0003] (1) The failure rate is high. The main faults include: fly ash wear, ash blocking, platinum electrode poisoning or peeling off, electric heater damage, etc. [0004] (2) The measurement accuracy is low. Affected by the accuracy of the sensor itself, the uneven distribution of flue gas oxygen content, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/28G06F19/00
Inventor 刘吉臻田亮常太华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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