Device for respectively capturing dioxin in dry flue gas and condensed water in flue gas sampling

Abstract

The invention discloses a device for respectively trapping dioxin in dry flue gas and condensed water during flue gas sampling, belongs to the technical field of incineration flue gas sampling, and relates to a method for simultaneously completing efficient trapping of water vapor in dry flue gas and flue gas. The device mainly comprises a dry flue gas XAD2 resin pipe, a flue gas water vapor XAD2 resin pipe, a liquid level upper limit sensor, a liquid level lower limit sensor material proportion two-way valve, a pressure balance pipe and a condenser. The mechanism solves the problems that water vapor in flue gas needs to be collected in the sampling process during flue gas sampling and liquid-liquid extraction needs to be carried out after sampling in the related technology through fixed cooperation of all the components, the efficiency is improved, secondary pollution is prevented, and the mechanism is suitable for various fields of industry, environmental protection and the like.

Description

Technical Field

[0001] The collection and analysis of dioxins in flue gas is a very important part of environmental monitoring and industrial emission control. This invention belongs to the field of environmental pollution analysis and monitoring, and mainly relates to the field of flue gas dioxin sampling, capture and analysis technology. Background Technology

[0002] With the rapid development of industry and environmental protection, increasingly higher demands are being placed on the sampling and analysis of dioxins in flue gas. The current mainstream method is the filtration-cooling-adsorption method, which has two application branches, but both have certain limitations, such as low efficiency and penetration issues. Therefore, it is necessary to study a more efficient method and system for flue gas sampling and analysis.

[0003] This paper addresses two main application branches of the current mainstream method for dioxin collection in flue gas: One branch involves collecting particulate matter through a fiber membrane, then cooling the moisture and gaseous components. The cooled gaseous components pass through XAD2 resin and are captured by XAD2, while the condensate is collected separately. Its advantage is that the gaseous components pass through XAD2 separately, resulting in high capture efficiency. However, its disadvantages include the need for liquid-liquid extraction of the collected moisture, which is inefficient and poses a risk of secondary pollution. The other branch involves collecting particulate matter through a fiber membrane, then cooling the moisture and gaseous components. The cooled condensate and gaseous components simultaneously pass through XAD2 resin and are captured by XAD2. Its advantage is simple capture, eliminating the need for separate collection and preparation of condensate. However, its disadvantages include lower capture efficiency due to the simultaneous passage of gaseous components and moisture through XAD2, and the possibility of penetration, especially during long-term sampling. Summary of the Invention

[0004] This invention is based on the first application described above, and simultaneously captures dioxins in condensate using XAD2 while sampling and capturing dioxins in gaseous components.

[0005] The pressure balancing tube equalizes the pressure at the lower end of the water vapor XAD2 resin tube with the condenser inlet pressure. Water droplets entering the water vapor XAD2 resin tube will pass through the XAD2 resin under the action of gravity, completing the adsorption of dioxins in the condensate. The condensate then flows through the water vapor XAD2 resin tube into the pressure balancing tube.

[0006] Before sampling, the pressure balancing tube needs to be filled with pure water, with the liquid level between the upper and lower limits. Water droplets flowing into the pressure balancing tube merge with the pure water. When the liquid level exceeds the upper limit, the controller receives a signal and automatically adjusts the opening angle of the PTFE proportional valve. As the angle opens, the liquid level drops. When the liquid level drops to the lower limit, the closing angle of the PTFE proportional valve is adjusted, and the liquid level stops dropping. As condensate drips in continuously, the liquid level reaches the upper limit again, and the above process is repeated.

[0007] Control Precautions: Always maintain a water column at the top of the PTFE proportional valve to prevent dry flue gas from passing through the moisture XAD2 resin tube.

[0008] The present invention provides a device for separately capturing dioxins in dry flue gas and condensate, which specifically includes a condenser 7, a water vapor resin tube 2, a pressure balance tube 6, a PTFE proportional two-way valve 5, and a dry flue gas resin tube 1.

[0009] The upper port of the water vapor resin pipe 2 is directly connected to the lower port of the condenser 7. The lower port of the water vapor resin pipe 2 is connected to the upper port of the pressure balance pipe 6. The side port of the pressure balance pipe 6 is connected to the upper port of the condenser 7. At the lower end of the pressure balance pipe 6, the upper limit liquid level sensor 3 and the lower limit liquid level sensor 4 are installed sequentially from top to bottom. The lower port of the pressure balance pipe 6 is connected to the upper port of the PTFE proportional two-way valve 5. The lower port of the PTFE proportional two-way valve 5 is connected to the lower port of the dry flue gas resin pipe 1 through a three-way valve. The upper side of the condenser 7 is connected to the upper end of the dry flue gas resin pipe 1.

[0010] The pressure balancing tube 6 uses pressure control to ensure that the condensate formed by the flue gas passing through the condenser passes through the water vapor XAD2 resin tube under gravity. During sampling, the gas in the pressure balancing tube is compressed by the condensate in the water vapor resin tube, and the pressure is higher than the flue gas outlet pressure at the top of the condenser bottle. This gas pressure difference effectively prevents the flue gas from entering the balancing tube during sampling.

[0011] Furthermore, in the above technical solution, the lower port of the PTFE proportional two-way valve 5 and the lower port of the dry flue gas resin tube 1 are connected to the sampling equipment via a three-way valve.

[0012] Furthermore, in the above technical solution, the resin in the water vapor resin tube 2 is XAD2 resin.

[0013] Furthermore, in the above technical solution, the resin in the dry flue gas resin pipe 1 is XAD2 resin.

[0014] Furthermore, in the above technical solution, the upper part of the condenser 7 is provided with a flue gas inlet that leads into the interior of the condenser.

[0015] Furthermore, in the above technical solution, the upper limit liquid level sensor 3 and the lower limit liquid level sensor 4 are respectively connected to the controller; the controller controls the PTFE material proportional two-way valve 5; when the liquid level exceeds the upper limit, the controller receives a signal and automatically adjusts the opening angle of the PTFE proportional valve. As the angle opens, the liquid level drops. When the liquid level drops to the lower limit, the closing angle of the PTFE proportional valve is adjusted, and the liquid level stops dropping. As water droplets continue to drip in, the liquid level reaches the upper limit again, and the above operation is repeated.

[0016] Furthermore, in the above technical solution, before flue gas sampling, the PTFE proportional two-way valve 5 is left open at a very small angle, and pure water is put into the pressure balance tube 6 so that its liquid level is between the upper limit sensor 3 and the lower limit sensor 4.

[0017] Furthermore, in the above technical solution, when using the flue gas sampling method: the PTFE proportional two-way valve 5 needs to adjust its opening angle according to the upper limit liquid level sensor 3 and the lower limit liquid level sensor 4, so that there is always a water column at the upper end of the PTFE proportional two-way valve 5. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the device structure of the present invention;

[0019] The components include: 1. Dry flue gas resin pipe; 2. Water vapor resin pipe; 3. Upper limit liquid level sensor; 4. Lower limit liquid level sensor; 5. PTFE proportional two-way valve; 6. Pressure balancing pipe; and 7. Condenser. Detailed Implementation

[0020] Example 1

[0021] like Figure 1 As shown, the dioxin collection device for dry flue gas and condensate water sampling includes a condenser 7, a water vapor resin tube 2, a pressure balance tube 6, a PTFE proportional two-way valve 5, and a dry flue gas resin tube 1.

[0022] The upper port of the water vapor resin tube 2 is directly connected to the lower port of the condenser 7. The lower port of the water vapor collection resin tube 2 in the flue gas is connected to the upper port of the pressure balance tube 6. The side port of the pressure balance tube 6 is connected to the upper port of the condenser 7. At the lower end of the pressure balance tube 6, the upper limit liquid level sensor 3 and the lower limit liquid level sensor 4 are installed sequentially from top to bottom. The lower port of the pressure balance tube 6 is connected to the upper port of the PTFE proportional two-way valve 5. The lower port of the PTFE proportional two-way valve 5 is connected to the lower port of the dry flue gas resin tube 1 through a three-way valve. The upper side of the condenser 7 is connected to the upper end of the dry flue gas resin tube 1.

[0023] The pressure balancing pipe 6 regulates the suction pressure through the PTFE proportional two-way valve 5 to control the condensate to pass through the XAD2 resin in the water vapor resin pipe 2 under the action of gravity.

[0024] The lower port of the PTFE proportional two-way valve 5 and the lower port of the dry flue gas resin tube 1 are connected to the sampling equipment via a three-way valve.

[0025] The resin in water vapor resin tube 2 is XAD2 resin.

[0026] The resin in the dry flue gas resin tube 1 is XAD2 resin.

[0027] The upper part of the condenser 7 is provided with a flue gas inlet that leads into the interior of the condenser.

[0028] The upper limit liquid level sensor 3 and the lower limit liquid level sensor 4 are respectively connected to the controller; the controller controls the PTFE proportional two-way valve 5; when the liquid level exceeds the upper limit, the controller receives a signal and automatically adjusts the opening angle of the PTFE proportional valve. As the angle opens, the liquid level drops. When the liquid level drops to the lower limit, the closing angle of the PTFE proportional valve is adjusted, and the liquid level stops dropping. As condensate drips in continuously, the liquid level reaches the upper limit again, and the above operation is repeated.

[0029] Before sampling the flue gas, the PTFE proportional two-way valve 5 is left with a very small opening angle. Pure water is placed into the pressure balance tube 6 so that its liquid level is between the upper limit sensor 3 and the lower limit sensor 4.

[0030] When using the PTFE proportional two-way valve 5 for specific flue gas sampling: the opening angle of the PTFE proportional two-way valve 5 needs to be adjusted according to the upper limit liquid level sensor 3 and the lower limit liquid level sensor 4 so that there is always a water column at the upper end of the PTFE proportional two-way valve 5.

[0031] The pressure balancing tube equalizes the pressure at the lower end of the XAD2 resin tube with the pressure at the condenser inlet. Water droplets entering the XAD2 resin tube will pass through under the action of gravity, completing the adsorption of dioxins. The water flowing through the XAD2 resin tube will then flow into the pressure balancing tube.

[0032] Before sampling, the pressure balance tube needs to be filled with purified water, with the liquid level between the upper and lower limits. Water droplets flowing into the pressure balance tube merge with the purified water. When the liquid level exceeds the upper limit, the controller receives a signal and automatically adjusts the opening angle of the PTFE proportional valve. As the angle opens, the liquid level drops. When the liquid level drops to the lower limit, the closing angle of the PTFE proportional valve is adjusted, and the liquid level stops dropping. As water droplets continue to drip in, the liquid level reaches the upper limit again, and the above process is repeated.

[0033] Control Precautions: Always maintain a water column at the top of the PTFE proportional valve to prevent dry flue gas from passing through the water vapor XAD2 resin tube.

[0034] The text describes a traditional sampling method where condensate is collected separately, requiring liquid-liquid extraction in a laboratory, which is inefficient. In contrast, a separate collection device captures substances from the water during sampling, with zero time consumption.

[0035] Experimental data

[0036]

Claims

1. A device for separately capturing dioxins in dry flue gas and condensate, characterized in that: Includes a condenser (7), a water vapor resin pipe (2), a pressure balance pipe (6), a PTFE proportional two-way valve (5), and a dry flue gas resin pipe (1); The upper port of the water vapor resin pipe (2) is directly connected to the lower port of the condenser (7). The lower port of the water vapor resin pipe (2) is connected to the upper port of the pressure balance pipe (6). The side port of the pressure balance pipe (6) is connected to the upper port of the condenser (7). At the lower end of the pressure balance pipe (6), the upper limit liquid level sensor (3) and the lower limit liquid level sensor (4) are installed sequentially from top to bottom. The lower port of the pressure balance pipe (6) is connected to the upper port of the PTFE proportional two-way valve (5). The lower port of the PTFE proportional two-way valve (5) is connected to the lower port of the dry flue gas resin pipe (1) through a three-way valve. The upper side of the condenser (7) is connected to the upper end of the dry flue gas resin pipe (1).

2. The apparatus as described in claim 1, characterized in that: The lower port of the PTFE proportional two-way valve (5) and the lower port of the dry flue gas resin tube (1) are connected to the sampling equipment via a three-way valve.

3. The apparatus as described in claim 1, characterized in that: The resin in the water vapor resin tube (2) is XAD2 resin.

4. The apparatus as described in claim 1, characterized in that: The resin in the dry flue gas resin tube (1) is XAD2 resin.

5. The apparatus as described in claim 1, characterized in that: The upper part of the condenser (7) is provided with a flue gas inlet that leads into the interior of the condenser.

6. The apparatus as claimed in claim 1, characterized in that: The upper limit liquid level sensor (3) and the lower limit liquid level sensor (4) are respectively connected to the controller; the controller controls the PTFE proportional two-way valve (5).

7. The apparatus as claimed in claim 1, characterized in that: Before sampling the flue gas, the PTFE proportional two-way valve (5) is opened at a certain angle, and pure water is put into the pressure balance tube (6) so that its liquid level is between the upper limit sensor (3) and the lower limit sensor (4).

8. The apparatus as claimed in claim 1, characterized in that, When using the PTFE proportional two-way valve (5) for specific flue gas sampling: the opening angle of the PTFE proportional two-way valve (5) needs to be adjusted according to the upper limit liquid level sensor (3) and the lower limit liquid level sensor (4) so ​​that there is always a water column at the upper end of the PTFE proportional two-way valve (5).

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