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Method for improving measurement accuracy of oxygen content in boiler flue gas

A technology for flue gas oxygen content and measurement accuracy, which is applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., and can solve problems such as the difficulty of excess air coefficient

Inactive Publication Date: 2013-04-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] Since it is difficult to measure the excess air ratio directly, only indirect measurement methods can be used

Method used

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  • Method for improving measurement accuracy of oxygen content in boiler flue gas
  • Method for improving measurement accuracy of oxygen content in boiler flue gas
  • Method for improving measurement accuracy of oxygen content in boiler flue gas

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Embodiment Construction

[0045] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0046] figure 1 It is a schematic diagram of the layout of the zirconia oxygen meter for a method of improving the measurement accuracy of the oxygen content of the boiler flue gas provided by the present invention. figure 1 Medium, S 1 , S 2 ... S 8 Zirconia oxygen sensor for placement. The flue gas produced by combustion is discharged from the furnace through the air preheater, dust collector and induced draft fan. In order to accurately reflect the oxygen content of the flue gas, samples are installed on both sides of the flue gas inlet of each air preheater. Each boiler has 4 air preheaters, and a total of 8 zirconia oxygen meters S 1 ,S 2 ,...,S 8 . Because the 8 zirconia oxygen meters are located in diff...

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Abstract

The invention discloses a method for improving measurement accuracy of the oxygen content in boiler flue gas and belongs to the technical field of online gas content measurement. According to the technical scheme, the method comprises the steps of establishing a space-time fusion model of the system for measuring the oxygen content of the flue gas; preprocessing the data of an oxygen quantity signal acquired by a zirconia oxygen indicator according to a data consistency testing principle; realizing the fusion of space and time of the oxygen quantity signal through a Kalman filtering fusion algorithm; and finally, calculating the boiler combustion efficiency and smoke outlet loss according to the fused oxygen quantity signal. The method has the beneficial effects that the data fusion technology is used for online measurement of the oxygen content of the flue gas in a heat-engine plant, the method is easy and convenient to calculate and high in reliability, the redundant or complementary information of the oxygen quantity sensor in space or time can be reflected, a measurement result which is more accurate than the arithmetic mean value of limited sensors is obtained, and the operating conditions of the unit can be accurately reflected.

Description

technical field [0001] The invention belongs to the technical field of on-line measurement of gas content, and in particular relates to a method for improving the measurement accuracy of oxygen content in boiler flue gas. Background technique [0002] In order to improve the combustion efficiency of the boiler and reduce the heat loss of incomplete combustion, the actual air volume sent into the furnace is larger than the theoretical air volume. The ratio of the actual air volume to the theoretical air volume is called the excess air coefficient. Shanghai Boiler Factory recommends the excess air coefficient at the furnace outlet of solid-state slagging pulverized coal furnace: 1.20-1.25 for anthracite, 1.15-1.20 for bituminous coal, and 1.08-1.12 for oil-fired furnace. Since anthracite is more difficult to burn than bituminous coal, the excess air coefficient at the furnace outlet should be selected larger; since fuel oil combustion is easier and more intense than coal combu...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 韩晓娟程成陈跃燕孔令达
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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