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System and method for quickly detecting air leakage factor of boiler tail flue

A technology of tail flue and air leakage coefficient, which is applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc. Wide range, stable and reliable operation, and high measurement accuracy

Inactive Publication Date: 2016-04-06
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, boiler oxygen detection mainly relies on the arrangement of oxygen measuring elements such as zirconia sensors in the tail flue. Due to the large cross-section of the tail flue, the distribution of oxygen in different areas of the same cross-section fluctuates to a certain extent, and the measuring points are only arranged near the wall of the flue. The actual oxygen content of the flue gas cannot be accurately

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  • System and method for quickly detecting air leakage factor of boiler tail flue
  • System and method for quickly detecting air leakage factor of boiler tail flue
  • System and method for quickly detecting air leakage factor of boiler tail flue

Examples

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Embodiment 1

[0029] Example 1: figure 1 The air leakage coefficient detection system of the tail flue shown is arranged at the outlet and inlet of the air preheater. Such as figure 2 As shown, the flue gas is collected by the flue gas sampling module 3, the flue gas temperature is cooled by the flue gas cooling module 4, and then the flue gas in each sampling tube is mixed evenly by the flue gas mixing module 5, and then passed through the flue gas filtering module 6. Filter out the solid particles in the flue gas, and send the flue gas to the condenser 8 to remove the moisture in the flue gas through the suction pump 7, and finally measure the oxygen content of the flue gas through the oxygen meter 9. The air leakage coefficient of the air preheater can be calculated through the measured oxygen value at the outlet and inlet of the air preheater, so that the state of the air preheater can be judged quickly and accurately. Such as image 3 As shown, wherein, the length of the sampling s...

Embodiment 2

[0030] Example 2: figure 1 The air leakage coefficient detection system of the tail flue shown is arranged after the high-temperature superheater, after the low-temperature superheater, after the economizer, and after the air preheater. Such as figure 2 As shown, the flue gas is collected by the flue gas sampling module 3, the flue gas temperature is cooled by the flue gas cooling module 4, and then the flue gas in each sampling tube is mixed evenly by the flue gas mixing module 5, and then passed through the flue gas filtering module 6. Filter out the solid particles in the flue gas, and send the flue gas to the condenser 8 to remove the moisture in the flue gas through the suction pump 7, and finally measure the oxygen content of the flue gas through the oxygen meter 9. By comparing the oxygen measurement results of different parts of the tail flue, the air leakage situation and the location of the air leakage in the tail flue of the boiler can be diagnosed. Such as ima...

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Abstract

The invention relates to a system and method for quickly detecting the air leakage factor of a boiler tail flue. The system and the method comprises: multipoint oxygen content sampling devices are arranged on a plurality of boiler tail flue regions including a superheater inlet, a reheater inlet, an economizer inlet, an air pre-heater inlet, an air pre-heater outlet, so that the tail flue segment and partition oxygen content online detection is realized; the multipoint oxygen content sampling device comprises a sampling pipe, a sampling casing pipe, a gas cooling module, a gas filtering module, an extracting pump, a condenser, an oxygen content meter and a data acquisition system; based on oxygen content detection results in different regions, the air leakage factor is calculated, and the boiler tail flue air leakage region is judged. According to the invention, the detection region can be freely arranged according to the size of the boiler tail flue, the amount and positions of detection points in one detection region can be flexibly arranged according to the section size of the flue, the system and the method has advantages including high precision, stable operation, low cost and the like, and can be widely used for the boiler tail flue air leakage factor quick detection, the oxygen content monitor and the like.

Description

technical field [0001] The invention belongs to the technical field of boiler oxygen detection, and in particular relates to a rapid detection system and detection method for the air leakage coefficient of a boiler tail flue. Background technique [0002] A boiler is a device that uses the heat energy released by fuel combustion to heat feed water to obtain steam at a specified temperature and pressure. The combustion of fuel entering the boiler requires an appropriate excess of air to achieve high-efficiency combustion of the fuel, but too high an oxygen excess coefficient has no obvious effect on improving the fuel efficiency of the boiler, but will increase the output of the induced draft fan and increase the power consumption of the plant; If it is low, it will lead to insufficient fuel combustion, resulting in energy waste, and will also affect the safety of boiler operation. Therefore, monitoring the oxygen content of flue gas is of great significance for boiler contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/04
CPCG01M3/04
Inventor 刘冠杰黄中江建忠徐正泉肖平
Owner HUANENG CLEAN ENERGY RES INST