KR101275882B1 - Continuous water vapor content measurement system of stack gas emissions - Google Patents

Abstract

The present invention relates to a flue gas exhaust gas measurement system, and more particularly, a moisture measurement unit capable of continuously measuring the mass of water with time included in the flue gas exhaust, and the moisture is removed from the flue gas exhaust Dry gas flow rate measuring unit for measuring the flow rate of the gas, it is possible to continuously measure the proportion of water in the chimney exhaust gas to improve the reliability of the measurement value, the volume of the water measuring unit is small The present invention relates to a chimney exhaust gas moisture measurement system having a simple configuration and easy installation.

Description

Continuous water vapor content measurement system of stack gas emissions

The present invention relates to a flue gas exhaust gas measurement system, and more particularly, a moisture measurement unit capable of continuously measuring the mass of water with time included in the flue gas exhaust, and the moisture is removed from the flue gas exhaust It is provided with a dry gas flow rate measuring unit for measuring the flow rate of the gas, and relates to a flue gas discharge measurement system capable of continuously measuring the proportion of water in the chimney discharge gas.

In general, the chimney flue gas continuous monitoring system includes sulfur dioxide (SO2), nitrogen oxides (NOx), CO (carbon monoxide), HCI (hydrogen chloride), hydrogen fluoride (HF), and the like. The environmental management agency can monitor the emission status and pollution level of air pollutants such as ammonia (NH3) for 24 hours in real time, reducing the emission of air pollutants, improving air quality, and preventing environmental pollution. It aims to provide residents with the basic data necessary for health promotion, environmental awareness and environmental policy.

The chimney exhaust gas continuous monitoring system is provided with a sampling unit for collecting the exhaust gas in the chimney, the sampling unit is connected to the pretreatment device, the pretreatment device is discharged from the sample collection unit for measurement Water is removed from the gas, and the exhaust gas passed through the pretreatment device is sent to the measuring device using Non Dispersive Infrared Detection (NDIR), which is a part of the light absorption analysis method, and the concentration of the measured gas is output. .

Here, the non-dispersion infrared absorption method is a method of measuring using a relatively narrow range of wavelengths using an optical filter, the infrared radiation emitted from the light source (black body light emission) is introduced into the measurement gas sample cell and the reference cell. In this case, the infrared gas is absorbed by the measurement component contained in the measurement gas in the measurement gas sample cell, and the infrared ray is not absorbed in the reference cell encapsulated with the inert gas. When a small amount of light change is output as an electrical signal using a sensor and associated with a conversion circuit, the concentration is output for each measurement gas.

On the other hand, in measuring the concentration of the measurement gas using the non-dispersion infrared absorption method as described above, the biggest factor that interferes with the measurement is the moisture contained in the measurement gas, which is removed from the pretreatment apparatus.

However, in order to measure the pollution degree of the exhaust gas by the total amount of the atmospheric environment, it is necessary to measure the amount of moisture removed from the pretreatment apparatus, and a device for measuring the amount of moisture has been disclosed.

Figure 1 shows a chimney exhaust gas moisture measurement device (hereinafter, prior art 1) disclosed in the air pollution process test method, the prior art 1 is a suction pipe (2); Absorption tube 3; Cooling tank 4; And an impinger train (5) having a plurality of impinger (5 ').

이라함.); 임핀저트레인(5) 중에 첫 번째와 두 번째 임핀저(5)에 100mg의 물을 넣고 네 번째 임핀저(5)에 200~300g의 실리카겔을 넣는 물질삽입단계; 흡인관(2) 내부에서 수분이 응축하지 않도록 흡인관(2)을 보온 및 가열하며, 냉각조(4)를 사용하여 흡습관(3)을 냉각하는 온도조절단계; 흡인관(2)을 굴뚝(1')의 일측에 형성된 측정공(1)에 삽입하고 흡습관(3)을 연결한 후 흡습관(3)의 콕크를 열고 진공펌프 등의 흡인장치를 가동시켜 가스를 흡인하는 가스흡인단계; 흡인 중 가스온도, 압력 및 유량을 측정하는 측정단계; 필요한 배출가스를 흡인한 후 흡습관(3)의 콕크를 닫고 배관을 분리하는 배관분리단계; 흡습관(3) 표면의 수분 및 부착물을 잘 닦은 후 무게를 측정하는 제2무게측정단계;(이하 측정된 값을

이라함.) 및 하기 계산식을 사용하는 수분량계산단계;를 포함하는 것을 특징으로 한다.In addition, the method of measuring the amount of water using the prior art 1, after filling the absorbent tube 3 with a moisture absorbent, washes off the adherents on the surface, closes the cock of the absorbent tube 3, and measures the weight thereof (hereinafter, measured). Measured value

This is called.); Inserting 100 mg of water into the first and second impingers 5 in the impinger train 5 and inserting 200-300 g of silica gel into the fourth impinger 5; A temperature adjusting step of warming and heating the suction pipe 2 to prevent condensation of moisture in the suction pipe 2, and cooling the absorption pipe 3 using the cooling tank 4; Insert the suction pipe 2 into the measuring hole 1 formed at one side of the chimney 1 ', connect the moisture absorption pipe 3, open the cock of the absorption pipe 3, and operate a suction device such as a vacuum pump. A gas suction step of sucking; A measuring step of measuring gas temperature, pressure and flow rate during suction; A pipe separation step of sucking the required exhaust gas and then closing the cock of the moisture absorption pipe 3 and separating the pipe; A second weight measurement step of measuring the weight after wiping the surface of the moisture absorption pipe 3 well and moisture; (hereinafter measured value

And a water content calculating step using the following formula.

However, the prior art 1 cannot be linked with the chimney exhaust gas continuous monitoring system, so the measurement value should be calculated separately and entered in the chimney exhaust gas continuous monitoring system and the volume of the measuring device. Has a disadvantage of being large.

In addition, the chimney exhaust gas shows a lot of difference in the amount of water according to the combustion environment of the plant, so it is not possible to obtain an accurate value with a single measurement, and thus requires continuous measured values. Due to the complexity of the measurement method, there is a disadvantage in that the reliability of the measured value is lowered because continuous measurement is impossible.

In addition, Korean Patent No. 1030931 ('Hydrogen chloride measuring device in continuous flue gas continuous measurement system and method of measuring exhaust gas using the same') prior art 2) is described in the hydrogen chloride measuring system in the continuous automatic flue gas measurement system of the chimney and Disclosed is a method for measuring the exhaust gas using the same, and the prior art 2 is a hydrogen chloride measuring device of the continuous automatic measurement system of the exhaust gas of the chimney, for measuring the exhaust gas of the chimney; A calibration material used to analyze the sample taken; A gas-liquid mixer for mixing the sample gas with the mixed liquid to sample the flue gas; A gas-liquid separator for separating the gas-liquids mixed in the gas-liquid mixer again into a gas and a liquid; In the continuous automatic measurement system of the exhaust gas consisting of an electrode unit for analyzing the sample gas sample components by the potential difference generated when the liquid is discharged from the gas-liquid separator, the absorption liquid inlet pipe and the sample gas inlet on the upper portion of the gas-liquid mixer The tube is provided, the lower portion is provided with a gas-liquid discharge pipe for supplying the sample to the gas-liquid separator with the gas-liquid mixture, the calibration gas inlet pipe is further provided at a corresponding position of the sample gas inlet pipe, The calibration material uses standard gas gasified at the set pressure of the buffer tank, and zero calibration and span calibration gas of different concentrations are used as standard gases. Three-way pinch valve is connected so that the correction gas through the pinch valve is introduced into the correction gas inlet pipe of the gas-liquid mixer. , Between the sample gas and so as to be selectively supplied to between a calibration gas and said calibration pinch valve calibration gas inlet pipe, discloses a meter hydrogen chloride, it characterized in that the sample provided with a pinch valve.

Prior art 2 uses a standard gas gasified at the set pressure of the buffer tank as a calibration liquid, and measures the sample gas by a system using the same and a method using the same. Reliability is greatly increased because it needs to be calibrated by the test report or inspection institution of the standard gas company, and it can greatly contribute to the calculation of certified data in integrated inspection or accuracy inspection, so that the accuracy of the measurement can be improved and the objective proof is possible. In addition, the response speed is 30 to 50% or more than the use of the conventional calibration solution has a useful working effect, but the prior art 2 is a system for measuring hydrogen chloride, which is different from the method of measuring moisture, so it is measured moisture Using to is unreasonable.

Korea Patent Registration No. 1030931 (Registration Announcement 2011.04.27)

Air Pollution Process Test-Environmental Buzzer (Revised 2007.08.07)

The present invention has been made to solve the problems as described above, an object of the present invention is a moisture measuring unit capable of continuously measuring the mass of water in accordance with the time contained in the flue gas, and the moisture in the flue gas It has a dry gas flow rate measuring unit that measures the flow rate of the removed dry gas, so it can be linked with the flue gas continuous monitoring system that can continuously check the pollution level of the flue gas. In order to improve the reliability of the measured value it is to provide a flue gas emission measurement system.

The present invention, the chimney exhaust gas moisture measurement system is connected to the chimney one side of the sampling portion for collecting a portion of the exhaust gas generated from the chimney ; and the pre-treatment connected to the sample collection portion to remove the moisture of the collected chimney exhaust gas And a water measurement unit connected to the pretreatment unit and measuring an amount of water generated by the pretreatment unit. A dry gas flow rate measuring unit; and a sample measuring unit connected to the dry gas flow rate measuring unit and analyzing the dry gas passing through the dry gas flow rate measuring unit; and the moisture measuring unit, the dry gas flow rate measuring unit, and the sample measuring unit. A measurement recording unit connected to the recording unit and recording the measured value ; Output means for outputting a value calculated by the measured value processing means; And a control unit.

In addition, the moisture measuring unit is a moisture collection container for collecting the moisture generated from the pretreatment device ; And a water removal container for removing the water measured in the water collection container; And a communicating tube connected to one side of the water collecting container and the other side of the water collecting container to move water from the water collecting container to the water removing container ; And a water measurement scale positioned below the water collection container . And a control unit.

In addition, the moisture measuring unit is located on the lower side of the moisture measuring scale, characterized in that the first dust-proof device for preventing the vibration of the moisture measuring scale is further provided.

In addition, the moisture measuring unit is a moisture collection container for collecting the moisture generated from the pretreatment device ; And a water removal container for removing the water measured in the water collection container; And a communication pipe having one side connected to the water collecting container and the other side connected to the water removing container ; And a water level sensor attached to one side of the moisture collection container ; And a control unit.

In addition, the moisture measuring unit is located on the lower side of the water collecting container is characterized in that the second dust-proof device for preventing the vibration of the water collecting container is further provided.

On the other hand, the moisture measuring unit is installed in a position higher than the moisture collection container and the water collecting vessel and the communication tube is formed in the 'U' shape, characterized in that to transfer the water in the water collection container to the water removal container. do.

Accordingly, the chimney exhaust gas moisture measuring system of the present invention by continuously measuring the moisture content of the water measuring unit to the measurement record, it is possible to continuously measure the water content of the chimney exhaust gas chimney exhaust gas continuous monitoring system (Tele Monitoring System) It has the advantage of being able to link with.

In addition, the amount of water contained in the flue gas fluctuates depending on the combustion environment of the plant, so it is difficult to accurately measure the degree of contamination, but the chimney flue gas moisture measurement system of the present invention continuously measures the amount of water, thereby improving reliability of the moisture measurement value. The advantage is that you can.

In addition, the chimney exhaust gas moisture measurement system of the present invention has the advantage that it is easy to install and easy to use because it can measure the continuous amount of moisture in a simple device.

1 is a schematic view showing a conventional chimney exhaust gas moisture measurement device.
Figure 2 is a schematic diagram showing a chimney exhaust gas moisture measurement system of the present invention.
Figure 3 is a graph showing the value of measuring the amount of moisture contained in the chimney exhaust gas using the present inventors chimney exhaust gas moisture measurement system.
Figure 4 is a schematic diagram showing another embodiment of the present inventors chimney exhaust gas moisture measurement system.

The present invention relates to a chimney exhaust gas moisture measurement system 100, which is connected to a chimney exhaust gas continuous monitoring system (Tele Monitoring System) for continuously measuring the pollution degree of the chimney exhaust gas contained in the chimney exhaust gas over time A system for continuously measuring moisture content.

On the other hand, the chimney exhaust gas moisture measurement system 100 of the present invention follows the regulation of the total amount of the atmospheric environment, the equation for measuring the pollution degree of the exhaust gas in the regulation of the total amount of the atmospheric environment is as follows.

Therefore, in order to calculate the emissions of pollutants per unit time by the regulation of the total amount of air environment, it is necessary to calculate the flow rate of the exhaust gas, and the formula for calculating the exhaust gas flow rate is as follows.

When the chimney is round, rectangular and square cross section,

When the chimney is of upper circular and arcuate cross section,

By combustion calculation,

The above three formulas can be used to calculate the flow rate of off-gases required to calculate the concentrations of pollutants per unit time given in the regulation of the total air volume.

In addition, to calculate this, it is necessary to measure the temperature, static pressure and dynamic pressure of each measuring point selected from the chimney, and select the measuring point close to the center of the chimney to know the moisture content and the density of the exhaust gas.

Accordingly, the chimney exhaust gas moisture measurement system 100 of the present invention is disclosed to measure the moisture content of the chimney exhaust gas, and the chimney exhaust gas moisture measurement system 100 of the present invention having the characteristics as described above is attached to the accompanying drawings. It will be described in detail with reference to.

Example 1

Figure 2 is a schematic diagram showing the moisture measurement system of the chimney exhaust gas of the present invention, with reference to Figure 2 describes the chimney exhaust gas moisture measurement system of the present invention.

The present inventors chimney exhaust gas moisture measurement system 100 is connected to the chimney, one side of the sampling section for collecting a portion of the exhaust gas generated from the chimney; and, connected to the sample collection section 10 and collected A pretreatment device 20 for removing water from the chimney discharge gas; and a water measurement unit 30 connected to the pretreatment device 20 and measuring the amount of water generated in the pretreatment device 20; and the pretreatment. It is connected to the device 20 and the dry gas flow rate measuring unit 40 for measuring the flow rate of the exhaust gas is removed through the pre-treatment device 20; And, connected to the dry gas flow rate measuring unit 40 A sample measuring unit 50 analyzing the dry gas passing through the dry gas flow measuring unit 40; and the moisture measuring unit 30, the dry gas flow measuring unit 40, and the sample measuring unit 50; A measurement recording unit 60 connected to record the measurement value; and receiving the measurement value of the measurement recording unit 60. Measured value processing means (70) for calculating the amount of water; And output means (80) for outputting the value calculated by the measured value processing means (70).

In addition, the sample collection unit 10 includes a suction tube capable of sucking the sample, the suction tube is inserted into the measuring hole formed in the chimney and a portion of the chimney exhaust gas for the measurement to the same flow rate of the chimney exhaust gas The sample is sucked into the sample collection unit 10 at a speed is characterized in that it is transferred to the pretreatment device (20).

In addition, the pretreatment device 20 is provided with a cooling means to cool the chimney discharge gas to condense the water vapor, the water vapor in the chimney discharge gas is characterized in that discharged to the moisture collection container 31 in a liquid state do.

In addition, the sample measuring unit 50 is provided with a flow meter therein, it is characterized in that the flow rate measurement for each component of the chimney exhaust gas from which water is removed.

In addition, the moisture measuring unit 30 is a water collecting container 31 for collecting the water generated from the pre-treatment device 20; and a water removing container 32 for removing the water measured in the water collecting container (31) And one side is connected to the water collection container 31 and the other side is connected to the water removal container 32 and the communication pipe 33 for moving the water from the water collection container 31 to the water removal container (32). ; And a water measurement scale positioned below the water collection container 31 to measure the amount of water collected in the water collection container 31, and connected to the measurement recording unit 60 to transmit the measured water value. 34); characterized in that it comprises a.

In addition, the moisture measurement scale 34 is characterized in that for measuring the mass of the water at a predetermined time interval from the moment when the water is generated in the pre-treatment device 20 to transmit to the measurement recording unit 60, the moisture measurement The increase in moisture mass per unit time may be calculated using a linear least square method using the value measured in the balance 34.

In addition, the moisture measuring unit 30 is located on the lower side of the moisture measurement scale 34, characterized in that the first dustproof device 36 for preventing the vibration of the moisture measurement scale 34 is further provided.

In addition, the moisture measuring unit 30 is the water collection container 31 is installed at a position higher than the water removal container 32 and the communication tube 33 is formed in the 'U' shape, the water collection container ( 31) and transfer the water in the water collection container 31 to the water removal container 32 by using gravity and the difference in atmospheric pressure acting on the surface of the liquid stored in each of the water removal container (32). It features.

Therefore, the moisture measuring unit 30 does not need a separate device for transferring the water in the water collecting container 31 to the water removing container 32, there is an advantage that it is economical and easy to use. .

In addition, the measured value processing means 70 may be a computer, characterized in that for measuring the amount of moisture using the following equation.

,

값은 상기 수분측정장치에서 측정되며 나머지 값은 상기 건조가스유량측정부(40)에서 측정되는 것을 특징으로 한다.In the formula for calculating the amount of water inside the chimney exhaust gas

,

The value is measured in the moisture measuring device and the remaining value is characterized in that measured in the dry gas flow measuring unit (40).

3 is a graph showing a value measured in real time the moisture contained in the chimney exhaust gas using the chimney exhaust gas moisture measurement system 100 of the present invention, the external environment when measuring the moisture contained in the chimney exhaust gas The conditions were 24.6 ° C., pressure 771 mm Hg, and water vapor pressure 5.69 mm Hg.

)은 4.6 (l/min)으로 측정되었다.Referring to Figure 3, as a result of measuring the moisture content using the chimney exhaust gas moisture measurement system 100, the amount of water increase is equal to the slope in the graph of Figure 3 and the value represents 4.629 (mg / s) Dry gas flow rate

) Was measured at 4.6 (l / min).

In addition, in the chimney exhaust gas moisture measurement system 100 in Figure 3, the moisture content is constantly increased to know that the water is discharged to the moisture removal container 32 when the water content is between 80 (g) to 90 (g). It can be seen that the time required to discharge the water is 30 minutes or 1 hour, the chimney exhaust gas moisture measurement system 100 can be seen that can measure the amount of water increase in units of 30 minutes or 1 hour.

In addition, the chimney exhaust gas moisture measurement system 100 is calculated based on the values measured at regular time intervals, there is an effect that can have a higher reliability than the conventional moisture content measuring device.

Example 2

Chimney exhaust gas moisture measurement system 100 of the present invention shown in Figure 2 is the same as the configuration shown in Example 1, yet another embodiment in which the moisture measuring unit 30 as shown in Figure 2 modified Will be described with reference to FIG.

The moisture measuring unit 30 includes: a water collecting container 31 for collecting water generated from the pretreatment device 20; and a water removing container 32 for removing water measured by the water collecting container 31; And a communication tube 33 for connecting one side to the water collecting container 31 and the other side connected to the water removing container 32 to move water from the water collecting container 31 to the water removing container 32. And a water level measuring sensor attached to one side of the water collecting container 31 and measuring the water level of the water collecting container 31 and connected to the measuring recording unit 60 to transmit the measured value to the measuring recording unit 60. 35); characterized in that it comprises a.

In addition, the water level measuring sensor 35 is attached to the height that can be discharged to the water removal container 32 through the communication tube 33, the moisture of the water collecting container 31, the water level measuring sensor 35 The water level measurement sensor 35 is delivered to the measurement recording unit 60 to the point where the moisture is collected to the position where the) is attached.

Therefore, the moisture measuring unit 30 continuously collects the time when the water is collected to the position of the water level measuring sensor 35 to the measurement recording unit 60 to collect the water inside the water collecting container 31. The time taken can be measured, and the height of the water level measuring sensor 35 is attached and the cross-sectional area of the water collecting container 31 can be known, so that the volume of the water collected in the water collecting container 31 can be known. Based on this, the amount of water over time can be calculated.

In addition, the moisture measuring unit 30 is located on the lower side of the water collecting container 31, characterized in that the second dustproof device 37 for preventing the vibration of the water collecting container 31 is further provided.

100: chimney exhaust gas moisture measurement system
10: sample collection unit 20: pretreatment device
30: moisture measuring unit 31: moisture collection container
32: water removal container 33: communication tube
34: moisture measuring scale 35: water level sensor
36: first vibration isolator 37: second vibration isolator
40: dry gas flow rate measuring unit 50: sample measuring unit
60: measuring recording unit 70: measuring value processing means
80: output means

Claims (6)

delete One side is connected to the chimney sample collection unit 10 for collecting a portion of the exhaust gas generated from the chimney ;
A pretreatment device 20 connected to the sample collection part 10 to remove moisture of the collected chimney discharge gas ;
One side of the water collecting container 31 for collecting water generated from the pretreatment device 20 and the water removing container 32 for removing the water measured by the water collecting container 31 and the water collecting container 31. A water measurement unit 30 having a connection pipe 33 connected to the other side and connected to the water removal container 32 and a water measurement scale 34 positioned below the water collection container 31 ;
A dry gas flow rate measurement unit 40 connected to the pretreatment device 20 and measuring a flow rate of the exhaust gas from which moisture is removed by passing through the pretreatment device 20 ;
A sample measuring unit 50 connected to the dry gas flow measuring unit 40 and analyzing the dry gas passing through the dry gas flow measuring unit 40 ;
A measurement recording unit 60 connected to the moisture measuring unit 30, the dry gas flow measuring unit 40, and the sample measuring unit 50 to record the measured value ;
Measurement value processing means (70) for receiving the measurement value of the measurement recording unit (60) and calculating the amount of moisture ; And
Output means (80) for outputting the value calculated by the measured value processing means (70 ); Chimney exhaust gas moisture measurement system comprising a. One side is connected to the chimney sample collection unit 10 for collecting a portion of the exhaust gas generated from the chimney ;
A pretreatment device 20 connected to the sample collection part 10 to remove moisture of the collected chimney discharge gas ;
One side of the water collecting container 31 for collecting water generated from the pretreatment device 20 and the water removing container 32 for removing the water measured by the water collecting container 31 and the water collecting container 31. The water measuring unit 30 is composed of a communication tube 33 connected to the other side and the water removal container 32 and a water level measuring sensor 35 attached to one side of the water collection container 31 ;
A dry gas flow rate measurement unit 40 connected to the pretreatment device 20 and measuring a flow rate of the exhaust gas from which moisture is removed by passing through the pretreatment device 20 ;
A sample measuring unit 50 connected to the dry gas flow measuring unit 40 and analyzing the dry gas passing through the dry gas flow measuring unit 40 ;
A measurement recording unit 60 connected to the moisture measuring unit 30, the dry gas flow measuring unit 40, and the sample measuring unit 50 to record the measured value ;
Measurement value processing means (70) for receiving the measurement value of the measurement recording unit (60) and calculating the amount of moisture ; And
Output means (80) for outputting the value calculated by the measured value processing means (70 ); Chimney exhaust gas moisture measurement system comprising a. The method according to claim 2 or 3,
The moisture measuring unit 30 is the moisture collection container 31 is installed at a position higher than the water removal container 32 and the communication tube 33 is formed in the 'U' shape, the moisture collection container 31 Chimney exhaust gas moisture measurement system, characterized in that for transferring the water inside the moisture removal container (32). The method of claim 2,
The moisture measuring unit 30 is located below the moisture measuring scale 34, and the chimney exhaust gas further comprises a first dustproof device 36 for preventing vibration of the moisture measuring scale 34. Moisture Measurement System. The method of claim 5,
The moisture measurement unit 30 is located below the moisture collection container 31, the chimney exhaust gas, characterized in that further provided with a second dustproof device (37) for preventing the vibration of the water collection container (31). Moisture Measurement System.

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