Condenser and flue gas monitoring system preprocessing device

Abstract

The utility model relates to flue gas monitoring pretreatment technical field, concretely is a condenser and flue gas monitoring system pretreatment device. The condenser includes outer pipe, separator, outlet pipe, condenser pipe and extension pipe. Wherein, along the outer pipe length direction one end is equipped with air inlet and air outlet, and the other end is equipped with liquid discharge port; The separator is located in the outer pipe inside, and the outer pipe is divided into first chamber and second chamber, the first chamber is located in the separator one side close to air inlet, and the second chamber is located in the separator one side close to liquid discharge port; The outlet pipe is set up in the first chamber, and the outlet pipe one end is in communication with the air outlet, and the other end passes through the separator, and is in communication with the second chamber; The condenser pipe is set up in the first chamber, and the condenser pipe one end is in communication with the air inlet, and the other end passes through the first chamber, and is in communication with the second chamber; The extension pipe is set up in the second chamber, and the extension pipe one end is in communication with the condenser pipe, and the other end extends towards the liquid discharge port.

Description

Technical Field

[0001] This utility model relates to the field of flue gas monitoring and pretreatment technology, specifically to a condenser and a pretreatment device for a flue gas monitoring system. Background Technology

[0002] During the operation of equipment in industrial and mining enterprises, power sectors, and other production units, flue gas is continuously generated. Enterprises or environmental regulatory departments need to conduct precise testing on the composition and content of the emitted flue gas, including sulfur dioxide (SO2) and nitrogen oxides (NOx). x () are routine testing indicators.

[0003] In actual emissions, flue gas often contains a certain proportion of moisture in addition to the target gas. Moisture can have several adverse effects on the detection process: Firstly, acidic gases such as sulfur dioxide are easily soluble in water, diluting the concentration of the target gas in the flue gas sample and directly causing inaccurate test results. Secondly, the moisture carried by the flue gas into the detection instrument can corrode precision components, shorten the instrument's lifespan, and in severe cases, cause instrument malfunctions, affecting the continuity of the detection work. Therefore, before the flue gas enters the flue gas analyzer, it is usually necessary to remove the moisture through a pretreatment process or control the moisture content below the instrument's allowable threshold.

[0004] Currently, the industry generally uses gas-liquid separation devices with structures similar to serpentine condenser tubes to achieve flue gas dehydration: by utilizing the long path and large contact area of ​​the spiral tube, the flue gas is fully cooled inside the tube, condensing the gaseous water into liquid water, and then separating the liquid water through the gas-liquid separation structure, so that the dried flue gas can finally enter the detection instrument from the outlet. Utility Model Content

[0005] In the process of developing this utility model, the inventors discovered that in some existing gas-liquid separation devices, the distance between the condensate outlet and the outlet of the dehydrated flue gas is too close. Under the suction force of the equipment's extraction system, the separated condensate is easily re-entrained by the airflow, or directly enters the flue gas outlet along the inner wall and mixes with the dry flue gas again. This leads to a significant decrease in the accuracy of subsequent flue gas detection results and can also cause the water-containing flue gas to re-enter the detection instrument, affecting the instrument's lifespan and reliability.

[0006] To address the above problems, this utility model provides a condenser and a pretreatment device for a flue gas monitoring system, which can effectively prevent liquid water formed by the cooling of the condenser from entering the gas outlet pipe, and guide the liquid water to flow in a directional and rapid manner to the drain port and discharge it, thereby ensuring the water removal effect before the flue gas enters the flue gas analyzer.

[0007] The first aspect of this utility model provides a condenser, comprising: an outer tube, a separator, an outlet pipe, a condenser pipe, and an extension pipe. The outer tube has an inlet and an outlet at one end along its length, and a drain outlet at the other end. The separator is located inside the outer tube, dividing it into a first chamber and a second chamber. The first chamber is located on the side of the separator closest to the inlet, and the second chamber is located on the side of the separator closest to the drain outlet. The outlet pipe is disposed in the first chamber, with one end connected to the outlet and the other end passing through the separator and connecting to the second chamber. The condenser pipe is disposed in the first chamber, with one end connected to the inlet and the other end passing through the first chamber and connecting to the second chamber. The extension pipe is disposed in the second chamber, with one end connected to the condenser pipe and the other end extending towards the drain outlet.

[0008] Optionally, the condenser also includes coolant, which is filled between the inner wall of the outer tube and the condenser tube and the outlet tube in the first chamber.

[0009] Optionally, the condenser is a spiral tube and the outlet pipe is a straight pipe, with the condenser coiled around the outer circumference of the outlet pipe.

[0010] Optionally, the height difference between the condensate outlet at the lower end of the extension pipe and the flue gas inlet at the lower end of the exhaust pipe shall not be less than 2 cm.

[0011] Optionally, a coolant injection port is provided at the end of the outer pipe near the air inlet and outlet; coolant is injected into the first chamber through the coolant injection port.

[0012] Optionally, the coolant inlet surface is threaded to match a plastic threaded cap.

[0013] Optionally, a gas-liquid separation ball is provided at the connection position between the gas outlet pipe and the separator, and the inner diameter of the gas-liquid separation ball is larger than the inner diameter of the gas outlet pipe.

[0014] Optionally, the ambient temperature range outside the condenser is 0°C. + 1℃, the internal operating temperature range of the condenser is 4℃. + 2℃.

[0015] Alternatively, the condenser can be made of glass.

[0016] The second aspect of this utility model provides a pretreatment device for a flue gas monitoring system, which includes the condenser described above.

[0017] The condenser provided by this invention extends the condenser tube of the first chamber toward the drain port into the second chamber to form an extension tube, creating a specific height difference between the condensate outlet at the lower end of the extension tube and the flue gas inlet of the exhaust pipe. Based on this design, not only can the liquid water condensed in the condenser tube be guided to flow quickly toward the drain port and discharged, but the height difference also effectively prevents the condensate from being drawn into the flue gas inlet of the exhaust pipe and entering the exhaust pipe under the suction force of the flue gas. This effectively avoids flue gas detection errors caused by moisture contamination, reduces the risk of corrosion of the detection equipment by water-containing gases, and significantly extends the service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a condenser provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a pretreatment device for a flue gas monitoring system provided in an embodiment of this utility model.

[0020] Figure 3 This is a partial structural diagram of a condenser provided in an embodiment of the present invention.

[0021] Reference numerals: 100-Condenser, 1-Outer pipe, 1A-First chamber, 1B-Second chamber, 11-Inlet, 12-Outlet, 13-Drain, 14-Coolant inlet, 15-Annular edge, 2-Condensing pipe, 3-Outlet pipe, 31-Flue gas inlet, 32-Gas-liquid separation ball, 4-Separator, 5-Extension pipe, 51-Condensate outlet, 200-Cold trap, 201-Cold cavity, 300-Pump, 400-Flue gas analyzer, ∆H-Height difference. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Figure 1 This is a schematic diagram of the structure of the condenser 100 provided in this embodiment, for reference. Figure 1The condenser 100 includes: an outer tube 1, a partition 4, an outlet pipe 3, a condenser pipe 2, and an extension pipe 5. The outer tube 1 has an inlet 11 and an outlet 12 at one end along its length, and a drain outlet 13 at the other end. The partition 4 is located inside the outer tube 1, dividing it into a first chamber 1A and a second chamber 1B. The first chamber 1A is located on the side of the partition 4 closest to the inlet 11, and the second chamber 1B is located on the side of the partition 4 closest to the drain outlet 13. The outlet pipe 3 is located in the first chamber 1A, with one end connected to the outlet 12 and the other end passing through the partition 4 and connecting to the second chamber 1B. The condenser pipe 2 is located in the first chamber 1A, with one end connected to the inlet 11 and the other end passing through the first chamber 1A and connecting to the second chamber 1B. The extension pipe 5 is located in the second chamber 1B, with one end connected to the condenser pipe 2 and the other end extending towards the drain outlet 13.

[0024] In this embodiment, by providing an extension pipe 5 connected to the condenser pipe 2 within the second chamber 1B of the condenser pipe 100, a height difference ∆H can be formed between the condensate outlet 51 at the lower end of the extension pipe 5 and the flue gas inlet 31 at the lower end of the exhaust pipe 3. Both flue gas and condensate enter the second chamber 1B through the condensate outlet 51. Subsequently, the condensate in the second chamber 1B is discharged to the outside through the drain port 13 at the lower end of the condenser pipe 100, while the flue gas, having undergone gas-liquid separation with the condensate and thus dehydrated, is introduced into the exhaust pipe 3 through the flue gas inlet 31. Finally, the dehydrated flue gas enters the downstream analytical instrument for analysis and measurement. By using the extension tube 5, on the one hand, the condensate formed in the condenser tube 2 can be guided to the drain port 13 at a short distance, avoiding the condensate from stagnating in the second chamber 1B; on the other hand, it can reduce the risk in traditional gas-liquid separation devices where the distance between the condensate outlet 51 and the flue gas inlet 31 is too short, and under the suction force of the condenser 100 being drawn from the inside to the outside through the outlet 12, the cooled liquid water is directly drawn into the outlet pipe 3 through the flue gas inlet 31, which ultimately leads to the liquid water entering the downstream analytical instruments and causing damage to the instruments.

[0025] This embodiment also provides a pretreatment device for a flue gas monitoring system including the aforementioned condenser 100, used for monitoring the composition and content of flue gas. (Reference) Figure 2The flue gas monitoring system also includes an extraction pump 300 and a flue gas analyzer 400. One end of the extraction pump 300 is connected to the outlet 12 of the condenser 100, and the other end is connected to the flue gas analyzer 400. Before the flue gas enters the flue gas analyzer 400, the high-temperature flue gas is first introduced into the inlet 11 of the condenser 100 for pretreatment. The condensate formed during the cooling process is discharged from the drain outlet 13 at the lower end of the condenser tube 100, thus completing the dehydration treatment of the flue gas. Then, the extraction pump 300 extracts the dry flue gas from the condenser 100 through the outlet 12 and finally introduces it into the flue gas analyzer 400 for component analysis and measurement. This flue gas monitoring system ensures the accuracy of the flue gas analysis results and extends the service life of the flue gas analyzer 400.

[0026] In this embodiment, to further improve the condensation and dehydration effect of the flue gas, the condenser 100 is typically used in conjunction with the cold trap 200. (See reference) Figure 2 The cold trap 200 contains a cold cavity 201. An electronic cooling chip (not shown in the figure) stably maintains the temperature within the cold cavity 201 within a specific low-temperature range, providing a continuous low-temperature environment for the efficient condensation of the condenser 100. The structure of the cold cavity 201 is adapted to the installation requirements of the condenser 100, allowing the condenser 100 to be vertically inserted along the length of its outer tube 1. Specifically, a ring-shaped edge 15 protruding outwards is provided around the outer edge of the top of the outer tube 1 of the condenser 100. When the condenser 100 is vertically inserted into the cold cavity 201, the lower surface of this ring-shaped edge 15 will tightly abut against the upper surface of the cold trap 200. This limiting structure keeps the condenser 100 and the cold trap 200 relatively fixed, while ensuring that the drain port 13 of the condenser 100 can smoothly extend from the bottom of the cold trap 200 without affecting the normal drainage of condensate. Considering that the condensation process of moisture in the flue gas to be dewatered mainly occurs in the first chamber 1A of the condenser 100, which is equipped with condenser tube 2, in order to ensure that the first chamber 1A can be completely in the low-temperature environment of the cold chamber 201 and achieve efficient heat exchange, in this embodiment, the height of the cold chamber 201 is matched with the length of the first chamber 1A to ensure that the condenser tube 2 is completely surrounded by the low-temperature environment and to ensure the condensation effect of the cold chamber 201 on the moisture in the flue gas.

[0027] refer to Figure 1In the first chamber 1A of the condenser 100, an annular gap is formed between the inner wall of the outer tube 1 and the outer walls of the condenser tube 2 and the outlet tube 3. When the high-temperature water-containing flue gas is introduced into the condenser tube 2, the heat it carries will be transferred sequentially: firstly, it will be conducted from the high-temperature flue gas to the tube wall of the condenser tube 2, and then through the heat transfer medium in the gap in the first chamber 1A, the heat will be transferred to the inner wall of the outer tube 1. Finally, the heat will be exchanged between the outer tube 1 and the low-temperature environment in the cold cavity 201 of the cold trap 200, thereby achieving rapid cooling of the high-temperature flue gas and providing a heat exchange environment for the subsequent condensation of gaseous water into liquid water.

[0028] Within the first chamber 1A of the condenser 100, a gaseous, liquid, or solid medium can be filled into the gap between the inner wall of the outer tube 1 and the outer walls of the condenser tube 2 and the outlet tube 3. Through the thermal conduction of the medium, heat transfer is achieved between the flue gas in the condenser tube 2 and the cold chamber 201. Considering that the thermal conductivity of a liquid medium is significantly better than that of a gas, and that it can more evenly coat the outer walls of the condenser tube 2 and the outlet tube 3, reducing local thermal resistance and further accelerating the heat transfer rate, in this embodiment, the heat transfer medium within the gap of the first chamber 1A is a liquid medium.

[0029] In this embodiment, the electronic cooling chip used in the cold trap 200 has a surface cooling temperature range of -2℃ to -6℃, which can stably maintain the ambient temperature inside the cold cavity 201 at around 0℃. If the first chamber 1A is filled with pure water, the low temperature inside the cold cavity 201 may cause the water to freeze. Since water increases in volume after freezing, it will cause the condenser 100 to be subjected to additional pressure, which may lead to the risk of cracking of the tube wall of the condenser 100. To avoid the risk of freezing, in this embodiment, it is preferable to fill the first chamber 1A with a coolant with antifreeze properties. This type of coolant can remain liquid in a low-temperature environment, ensuring stable heat transfer, while accurately maintaining the internal operating temperature of the condenser 100 within the range of 4±2℃, which not only meets the temperature difference conditions required for flue gas condensation, but also ensures long-term stable operation of the equipment.

[0030] refer to Figure 1 The outer tube 1 has an air inlet 11 and an air outlet 12 at its end, and also has a coolant inlet 14, through which coolant is injected into the first chamber 1A.

[0031] The condenser 100 is used to condense high-temperature flue gas, which contains a certain proportion of sulfur dioxide, nitrogen oxides, or other types of acidic or alkaline gases. Therefore, the condenser 100 has high requirements for corrosion resistance to acids, alkalis, and salts. Simultaneously, the condenser 100 needs to be able to withstand both high and low temperature operating environments and possess strong heat exchange efficiency. In this embodiment, to ensure that the condenser 100 simultaneously meets the above performance requirements, glass is selected as the material for manufacturing the condenser 100.

[0032] In this embodiment, the surface of the coolant inlet 14 is threaded, and a matching plastic threaded cap (not shown in the figure) is designed to fit it. After the coolant is filled, simply tightening the plastic threaded cap achieves a reliable seal at the inlet, preventing coolant leakage and isolating external impurities. Furthermore, after the condenser 100 has been running for a period of time, if coolant needs to be added or replaced, the operator can easily operate by simply unscrewing the plastic threaded cap. This design not only ensures that the condenser 100 maintains a stable cooling effect but also significantly extends the overall service life of the condenser 100.

[0033] To further enhance the cooling effect and heat exchange efficiency of the condenser tube 2 for high-temperature flue gas within a limited equipment volume, in this embodiment, the condenser tube 2 is a spiral tube. Within the same length of the outer tube 1, compared to a straight tube, the spiral tube allows for a longer pipe extension, thereby extending the residence time of the flue gas within the condenser tube 2. Simultaneously, the larger contact area between the spiral tube and the coolant allows for more thorough heat exchange between the gaseous water in the flue gas and the coolant, condensing it into liquid water, laying the foundation for subsequent efficient water removal. To make the overall structure of the condenser 100 more compact, reduce the equipment space occupied, and lower the installation difficulty, reference is made to… Figure 1 The exhaust pipe 3 in the first chamber 1A is a straight pipe, and the condenser pipe 2 is coiled around the outer periphery of the exhaust pipe 3.

[0034] Currently, condensers 100 designed for flue gas dehydration are generally small in size due to installation space and application scenarios. If the condensate outlet 51 at the lower end of the condenser tube 2 is too close to the flue gas inlet 31 at the lower end of the exhaust pipe 3, the liquid water formed by the cooling of the condenser tube 2 can easily be drawn directly into or enter the flue gas inlet 31 along the inner wall under the suction force generated by the suction pump 300 after being discharged from the outlet, causing the moisture to re-mix into the dry flue gas, thus affecting the gas-liquid separation effect of the condenser 100. Therefore, in this embodiment, an extension pipe 5 communicating with the condenser tube 2 is provided in the second chamber 1B, and the condensate outlet 51 at one end of the extension pipe 5 faces the drain port 13 of the outer pipe 1. Based on the above design, referring to Figure 2 and Figure 3On the one hand, the condensate can be directed to the drain outlet 13 via the extension pipe 5, preventing it from splashing or adhering to the inner wall of the second chamber 1B due to flue gas flow after entering the second chamber 1B, thus preventing it from flowing quickly to the drain outlet 13. On the other hand, the condenser 100 provided in this embodiment is installed perpendicular to the ground along the length of the outer pipe 1 during operation. Using the extension pipe 5, a height difference ∆H can be formed between the condensate outlet 51 in the second chamber 1B and the flue gas inlet 31. This allows the liquid water to flow towards the lower drain outlet 13 under gravity, while the flue gas inlet 31 is located at a relatively high position. Even under the suction force of the suction pump, the condensate is difficult to be drawn to the flue gas inlet 31, thus better completing the water removal process of the flue gas in the form of gas-liquid separation. More preferably, the height difference ∆H between the condensate outlet 51 of the extension pipe 5 and the flue gas inlet 31 of the exhaust pipe 3 is not less than 2 cm.

[0035] To further intercept any tiny water droplets that may remain in the flue gas and prevent them from entering the exhaust pipe 3 and affecting subsequent detection, in this embodiment, a gas-liquid separation ball 32 is provided at the connection position between the exhaust pipe 3 and the separator 4. (Refer to...) Figure 3 The inner diameter of the gas-liquid separation ball 32 is larger than the inner diameter of the outlet pipe 3. With the above design, even if some tiny water droplets pass through the flue gas outlet on the separator 4 and enter the first chamber 1A from the second chamber 1B, they will settle after entering the gas-liquid separation ball 32 with a larger inner diameter because the gas flow rate decreases and their own weight is greater than the buoyancy. This further improves the gas-liquid separation effect of flue gas and water.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A condenser, characterized in that, include: The outer tube has an air inlet and an air outlet at one end along its length, and a liquid outlet at the other end. A separator, located inside the outer tube, divides the outer tube into a first chamber and a second chamber. The first chamber is located on the side of the separator closer to the air inlet, and the second chamber is located on the side of the separator closer to the drain outlet. An air outlet pipe is disposed in the first chamber, with one end of the air outlet pipe communicating with the air outlet and the other end passing through the partition and communicating with the second chamber. A condenser tube is disposed in the first chamber, with one end of the condenser tube connected to the air inlet and the other end passing through the first chamber and connected to the second chamber. An extension tube is disposed in the second chamber, with one end of the extension tube connected to the condenser tube and the other end extending toward the drain port.

2. The condenser as described in claim 1, characterized in that, Also includes: Coolant is filled between the inner wall of the outer tube and the condenser tube and the outlet tube in the first chamber.

3. The condenser as described in claim 1, characterized in that, The condenser is a spiral tube, and the outlet pipe is a straight pipe. The condenser is coiled around the outer circumference of the outlet pipe.

4. The condenser as described in claim 1, characterized in that, The height difference between the condensate outlet at the lower end of the extension pipe and the flue gas inlet at the lower end of the exhaust pipe shall not be less than 2 cm.

5. The condenser as described in claim 2, characterized in that, A coolant injection port is also provided at the end of the outer pipe near the air inlet and the air outlet; The coolant is injected into the first chamber through the coolant inlet.

6. The condenser as described in claim 5, characterized in that, The surface of the coolant inlet is threaded to match the plastic threaded cap.

7. The condenser as claimed in claim 1, characterized in that, A gas-liquid separation ball is provided at the connection position between the air outlet pipe and the separator, and the inner diameter of the gas-liquid separation ball is larger than the inner diameter of the air outlet pipe.

8. The condenser as described in claim 2, characterized in that, The ambient temperature range outside the condenser is 0°C. + The condenser operates at a temperature of 1℃, and its internal operating temperature range is 4℃. + 2℃.

9. The condenser as claimed in claim 1, characterized in that, The condenser is made of glass.

10. A pretreatment device for a flue gas monitoring system, characterized in that, It includes a condenser as described in any one of claims 1 to 9.

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