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Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line

A coal-fired boiler, acid dew point technology, applied in the direction of material moisture content, etc., can solve the problems of low accuracy, acid dew point meter can not carry out continuous online monitoring, can not provide parameters for industrial equipment online control, etc., to achieve simple and convenient operation, data The effect of fast processing speed and accurate measurement results

Active Publication Date: 2012-09-12
HUADIAN ENVIRONMENTAL PROTECTION ENG & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid dew point meter actually measures the curve of the voltage or current between the probe electrodes changing with the temperature of the probe. Different interpretations of the curve will affect the determination of flue gas condensation, thus directly affecting the measurement results of the acid dew point; at the same time, the coal-fired boiler Impurities such as fly ash in the tail flue gas also have a great influence on the measurement results of the acid dew point meter, so the accuracy of the results measured by the acid dew point meter is low; in addition, due to the limitation of the acid dew point meter measurement principle, the acid dew point meter cannot Continuous on-line monitoring can not provide parameters for on-line control of industrial devices

Method used

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  • Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line
  • Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line
  • Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line

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Embodiment 1

[0021] Embodiment 1 of the present invention: a method for online continuous monitoring of the acid dew point of flue gas at the tail of a coal-fired boiler, such as figure 1 As shown, it includes: filtering the flue gas at the tail of the coal-fired boiler to be tested; the flue gas condenser cools the filtered flue gas to 0°C by means of rapid cooling; the sealed container collects the discharged condensed water and uses a pH meter to measure the condensed water The pH value of the water; the pH value of the condensed water is recorded as a; since the contents of water and sulfuric acid in the condensed water all come from the flue gas, there are:

[0022] SO in flue gas 3 with H 2 The volume ratio of O is

[0023] V(SO 3 ) / V(H 2 O) = 10 -a / (1000 / 18)=0.018*10 -a ;

[0024] According to the humidity data of the flue gas before entering the condenser measured by the flue gas hygrometer, the SO in the flue gas can be calculated 3 volume content:

[0025] V(SO 3 )=0.0...

Embodiment 2

[0031] Embodiment 2 of the present invention: a method for online continuous monitoring of the acid dew point of flue gas at the tail of a coal-fired boiler, such as figure 1 As shown, including: filtering the flue gas at the tail of the coal-fired boiler to be tested; the flue gas condenser cools the filtered flue gas to 4°C in a rapid cooling manner; the sealed container collects the discharged condensed water and uses a pH meter to measure the condensed water The pH value of the water; the flue gas hygrometer measures the humidity of the flue gas before entering the condenser; calculates the SO in the flue gas 3 with H 2 Volume ratio of O, SO 3 The volume content and the acid dew point of flue gas.

[0032] A device for continuously monitoring the acid dew point of flue gas at the tail of a coal-fired boiler to realize the above method, such as figure 2As shown, it includes: a flue gas condenser 1, a peristaltic pump 2, a container 3, a pH meter 4, a flue gas online con...

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Abstract

The invention discloses a method and a device for continuously monitoring a flue gas acid dew point at the tail part of a coal burning boiler on line. The method comprises the following steps: S1, to-be-detected flue gas at the tail part of the coal burning boiler is cooled to 0 to 4 DEG C in a rapid cooling manner through a flue gas condenser, condensed water is collected and a PH meter is used for measuring the PH value of the condensed water; S3, a flue gas hygrometer is used for measuring the moisture of the flue gas before entering the condenser; and S4, the volume ratio of SO3 to H2O in the flue gas, the volume content of SO3 and a flue gas acid dew point are calculated. According to the invention, the measurement result is converted through an automatic measuring instrument (including the PH meter, the flue gas hygrometera and the signal transmitting device) into electrical signals to be sent to an on-line monitoring system, and the flue gas acid dew point is obtained by calculation and treatment of the system. Therefore, on-line continuous monitoring is achieved, the operation in the entire process is convenient, and the measurement result is accurate; and the data processing speed is fast, and parameters can be provided for on-line control on an industrial device.

Description

technical field [0001] The invention relates to a method and a device for continuously monitoring the acid dew point of flue gas at the tail of a coal-fired boiler online, and belongs to the technical field of air purification and environmental protection. Background technique [0002] A certain amount of SO is contained in the tail gas of coal-fired boilers 3 , they are easily condensed with water vapor in the flue gas to form H 2 SO 4 Steam condenses on the heating surface or the surface of metal materials whose temperature is close to or lower than the acid dew point, causing acid corrosion and limiting the recovery and utilization of low-temperature flue gas waste heat. Therefore, online continuous detection of flue gas acid dew point can provide important control parameters for the utilization of low-temperature flue gas waste heat and the continuous and safe production of coal-fired boilers. [0003] There are two traditional ways to determine the acid dew point: th...

Claims

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Application Information

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IPC IPC(8): G01N25/68
Inventor 沈煜晖李超李建浏金颖姗付丽辉
Owner HUADIAN ENVIRONMENTAL PROTECTION ENG & TECH