Straight-through type cold trap assembly for greenhouse gas sampling

Abstract

The utility model discloses a straight-through type cold trap assembly for greenhouse gas sampling, which relates to the technical field of experimental equipment and specifically comprises heat exchange sections, two adjacent heat exchange sections are connected through a connecting sleeve, each heat exchange section comprises an inner tube, the outer surface of each inner tube is wrapped with a heat preservation pad, semiconductor coolers are uniformly fixed in an inner cavity of each heat exchange section, and the semiconductor coolers are connected with the heat exchange sections through connecting sleeves. The cold end of the semiconductor cooler is located in an inner cavity of the heat exchange section, the hot end of the semiconductor cooler is located outside the heat exchange section, a blowpipe is fixed to the outer surface of the heat exchange section, and spray holes are formed in the side, close to the hot end of the semiconductor cooler, of the blowpipe. A temperature detector is arranged in an inner cavity of the air inlet end of the heat exchange section, and a liquid drop intercepting film is fixed in an inner cavity of the air outlet end of the heat exchange section. According to the straight-through type cold trap assembly for greenhouse gas sampling, the mode that sampled greenhouse gas directly exchanges heat with the cold end of the semiconductor cooler is adopted, the cooling speed of the greenhouse gas is increased, and then the water removal efficiency of the greenhouse gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental equipment, in particular to a straight-through cold trap component for greenhouse gas sampling. Background Art

[0002] Gas analyzers designed based on the principles of infrared spectroscopy are very sensitive to the concentration of water vapor in the sample. The concentration of water vapor will absorb infrared light, thus affecting the accuracy of the results of the gas analyzer. Therefore, according to the technical requirements for greenhouse gas sampling in meteorological observation specifications and environmental monitoring specifications, in order to avoid the impact of water vapor on greenhouse gas monitoring results, it is necessary to select dehydration equipment based on local climate conditions, analyzer principles and data quality target requirements. The cold trap is an important part of the condensation dehumidification device. The design of this part will directly affect the dryness of the gas to be tested, and thus directly affect the accuracy of the monitoring data of the gas analyzer.

[0003] The principle of cooling the cold trap tube in the prior art is mainly: the heat in the greenhouse gas is transferred to the cold fluid through indirect heat exchange, and the water in the greenhouse gas is liquefied or frozen during the heat exchange process to achieve the purpose of water removal. However, due to the indirect heat exchange between the greenhouse gas and the cold fluid, there is a loss in heat transfer, and the temperature of the cold fluid gradually increases during the flow process. The heat exchange rate between the heated cold fluid and the greenhouse gas is reduced, and the water removal effect is affected. Based on this, the present application proposes a straight-through cold trap assembly for greenhouse gas sampling. Utility Model Content

[0004] The utility model provides a straight-through cold trap assembly for greenhouse gas sampling, which solves the problem of low water removal efficiency in the indirect heat exchange method proposed in the above background technology.

[0005] The utility model provides the following technical solutions: a straight-through cold trap assembly for greenhouse gas sampling, comprising a heat exchange section, two adjacent heat exchange sections are connected by a connecting sleeve, the heat exchange section comprises an inner tube, the outer surface of the inner tube is wrapped with a thermal insulation pad, the inner cavity of the heat exchange section is evenly fixed with semiconductor refrigerators, the cold end of the semiconductor refrigerator is located in the inner cavity of the heat exchange section, the hot end of the semiconductor refrigerator is located outside the heat exchange section, a blow pipe is fixed on the outer surface of the heat exchange section, and a spray hole is provided on the side of the blow pipe close to the hot end of the semiconductor refrigerator; a temperature detector is provided in the inner cavity of the air inlet end of the heat exchange section, and a droplet interception membrane is fixed in the inner cavity of the air outlet end of the heat exchange section.

[0006] Preferably, the outer rings at both ends of the heat exchange section are fixed with connecting rings, and the connecting rings are connected to the connecting sleeves through screws and nuts.

[0007] Preferably, the distance between the end of the connecting ring and the end of the heat exchange section is half of the width of the connecting sleeve.

[0008] Preferably, sealing gaskets are fixed to the inner wall and the end of the connecting sleeve.

[0009] Preferably, the cold ends of two adjacent semiconductor refrigerators are in a staggered state, and the wind sprayed from the spray hole blows onto the hot end of the adjacent semiconductor refrigerator.

[0010] Preferably, the heat exchange section is a straight-through structure, and the inner wall of the heat exchange section and the outer surface of the droplet intercepting membrane are both coated with a hydrophobic coating.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The straight-through cold trap assembly for greenhouse gas sampling adopts a method of direct heat exchange between the sampled greenhouse gas and the cold end of the semiconductor refrigerator to increase the cooling rate of the greenhouse gas, thereby improving the water removal efficiency of the greenhouse gas; through the setting of the semiconductor refrigerator and the temperature detector, the cold trap assembly can control the output voltage of the semiconductor refrigerator power supply according to the temperature of the greenhouse gas, adjust the cooling capacity of the semiconductor refrigerator, so that the water in the greenhouse gas can be liquefied but not frozen, which can avoid clogging of the cold trap assembly and reduce the energy loss of the cold trap assembly.

[0013] 2. The straight-through cold trap assembly for greenhouse gas sampling is equipped with a droplet interception membrane, which can intercept liquefied water droplets to achieve gas-liquid separation, prevent liquefied water droplets from affecting the subsequent heat exchange of greenhouse gases, improve the efficiency of greenhouse gas cooling, and further improve the water removal efficiency of the sampled greenhouse gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the structure of the utility model;

[0015] Figure 2 The utility model structure Figure 1 Back diagram;

[0016] Figure 3 This is a schematic diagram of the location of the heat exchange section and the connecting sleeve of the utility model structure;

[0017] Figure 4 This is a schematic diagram of the heat exchange section of the utility model structure;

[0018] Figure 5 The utility model structure Figure 4 Front view schematic diagram.

[0019] In the figure: 1. heat exchange section; 2. inner tube; 3. insulation pad; 4. blow pipe; 5. spray hole; 6. semiconductor refrigerator; 7. connecting ring; 8. connecting sleeve; 9. droplet intercepting membrane; 10. screw; 11. temperature detector. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model provides a straight-through cold trap assembly for greenhouse gas sampling, including a heat exchange section 1, which is a straight-through structure. When the cold trap assembly is in use, the sampled gas can be prevented from remaining in the heat exchange section 1. Connecting rings 7 are fixed to the outer surfaces of both ends of the heat exchange section 1, and two adjacent heat exchange sections 1 are connected by a connecting sleeve 8, and the connecting ring 7 and the connecting sleeve 8 are connected by a screw 10 and a nut. In this way, the heat exchange section 1 can be quickly disassembled and assembled through the setting of the connecting ring 7 and the connecting sleeve 8, so that when the cold trap assembly is in use, the user can adjust the length of the cold trap assembly according to the needs, improve the adaptability of the cold trap assembly, and facilitate the cleaning and replacement of the cold trap assembly.

[0022] The distance between the end of the connecting ring 7 and the end of the heat exchange section 1 is half the width of the connecting sleeve 8. When two adjacent heat exchange sections 1 are connected by the connecting sleeve 8, the joints of the two heat exchange sections 1 are sealed by the connecting sleeve 8, thereby improving the sealing performance when the two heat exchange sections 1 are connected. The inner wall and the end of the connecting sleeve 8 are fixed with sealing gaskets, which can be made of rubber. By setting the sealing gaskets, the sealing performance when the two heat exchange sections 1 are connected can be increased, which is convenient for the use of the cold trap assembly.

[0023] The heat exchange section 1 includes an inner tube 2, the outer surface of the inner tube 2 is wrapped with an insulation pad 3. Through the setting of the insulation pad 3, the insulation pad 3 can separate the inner cavity of the heat exchange section 1 from the external environment, reduce the impact of the external environment on the inner cavity environment of the heat exchange section 1, reduce the cold air loss in the heat exchange section 1, and facilitate the cold trap assembly to cool the sampled greenhouse gas.

[0024] The inner cavity of the heat exchange section 1 is evenly fixed with semiconductor refrigerators 6, the cold end of the semiconductor refrigerator 6 is located in the inner cavity of the heat exchange section 1, the hot end of the semiconductor refrigerator 6 is located outside the heat exchange section 1, and the cold ends of two adjacent semiconductor refrigerators 6 are in a staggered state. Through the setting of the semiconductor refrigerator 6, when the semiconductor refrigerator 6 is working, the cold end of the semiconductor refrigerator 6 can be cooled. When the cold trap assembly is in use, the sampled greenhouse gas flowing in the heat exchange section 1 can directly contact the cold end of the semiconductor refrigerator, thereby realizing direct heat exchange and improving heat exchange efficiency.

[0025] A blowing pipe 4 is fixed to the outer surface of the heat exchange section 1. A spray hole 5 is provided on the side of the blowing pipe 4 close to the hot end of the semiconductor refrigerator 6. The wind sprayed from the spray hole 5 is blown to the hot end of the semiconductor refrigerator 6 adjacent thereto. Through the arrangement of the spray hole 5 and the blowing pipe 4, the air flowing in the blowing pipe 4 can be sprayed to the hot end of the semiconductor refrigerator 6 through the spray hole 5, thereby cooling the hot end of the semiconductor refrigerator 6 and facilitating the use of the semiconductor refrigerator 6.

[0026] A temperature detector 11 is provided in the inner cavity of the air inlet end of the heat exchange section 1. Through the setting of the temperature detector 11, the temperature detector 11 can detect the temperature of the gas flowing in the heat exchange section 1. By adjusting the output voltage of the power supply of the semiconductor refrigerator 6, the cooling capacity of the semiconductor refrigerator 6 is adjusted, so that the water in the greenhouse gas can be liquefied but not frozen, thereby avoiding blockage of the cold trap assembly.

[0027] A droplet interception membrane 9 is fixed in the inner cavity of the air outlet end of the heat exchange section 1. Through the setting of the droplet interception membrane 9, the droplet interception membrane 9 can intercept the condensed water in the gas, realize the separation of water and gas, reduce the influence of condensed water on the subsequent heat exchange of the gas, and improve the gas heat exchange efficiency. In some embodiments of the present application, the material of the droplet interception membrane 9 is a hydrophobic membrane that is permeable to gas but not permeable to liquid.

[0028] The inner wall of the heat exchange section 1 and the outer surface of the droplet intercepting membrane 9 are coated with a hydrophobic coating. Through the setting of the hydrophobic coating, the liquefied water on the surface adheres to the inner wall of the heat exchange section 1 and the droplet intercepting membrane 9, which facilitates the discharge of the liquefied water.

[0029] In summary: when the straight-through cold trap assembly for greenhouse gas sampling is used, the cold trap assembly is externally connected to an air blowing device, which can be a blower of model GD30K2-12, and the air outlet of the blower is connected to the air inlet of the blowing pipe 4. The collected greenhouse gas to be cooled enters the cold trap assembly through the air inlet of the heat exchange section 1. During the flow of the greenhouse gas in the cold trap assembly, the temperature detector 11 first detects the temperature of the greenhouse gas, and adjusts the output voltage of the power supply of the semiconductor refrigerator 6 according to the detection result, so that the cooling capacity of the cold end of the semiconductor refrigerator 6 makes the water in the gas liquefied without freezing, and the greenhouse gas in the cold trap assembly is cooled. During the flow in the trap assembly, the greenhouse gas and the cold end of the semiconductor refrigerator 6 directly exchange heat, the water vapor in the greenhouse gas cools down and liquefies, the droplet interception membrane 9 can intercept the liquefied water droplets, separate the water droplets from the gas, reduce the influence of the water droplets on the heat exchange of the gas, and improve the efficiency of the subsequent heat exchange of the gas. The dehumidified sampling gas is discharged through the air outlet end of the heat exchange section 1. During the use of the cold trap assembly, the blower works and blows the outside air into the blowing pipe 4. The air in the blowing pipe 4 is sprayed to the hot end of the semiconductor refrigerator 6 through the spray hole 5, and the hot end of the semiconductor refrigerator 6 is dissipated. This facilitates the use of the semiconductor refrigerator 6.

[0030] The standard parts used in the utility model can be purchased from the market, and the special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art and will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A straight-through cold trap assembly for greenhouse gas sampling, comprising a heat exchange section (1), characterized in that: Two adjacent heat exchange sections (1) are connected via a connecting sleeve (8), the heat exchange section (1) comprising an inner tube (2), the outer surface of the inner tube (2) being wrapped with a heat preservation pad (3), the inner cavity of the heat exchange section (1) being evenly fixed with a semiconductor refrigerator (6), the cold end of the semiconductor refrigerator (6) being located in the inner cavity of the heat exchange section (1), the hot end of the semiconductor refrigerator (6) being located outside the heat exchange section (1), the outer surface of the heat exchange section (1) being fixed with a blow pipe (4), the blow pipe (4) being provided with a spray hole (5) on one side close to the hot end of the semiconductor refrigerator (6); the inner cavity of the air inlet end of the heat exchange section (1) being provided with a temperature detector (11), and the inner cavity of the air outlet end of the heat exchange section (1) being fixed with a droplet interception membrane (9).

2. A straight-through cold trap assembly for greenhouse gas sampling according to claim 1, characterized in that: The outer rings at both ends of the heat exchange section (1) are fixed with connecting rings (7), and the connecting rings (7) are connected to the connecting sleeve (8) via a screw (10) and a nut.

3. A straight-through cold trap assembly for greenhouse gas sampling according to claim 2, characterized in that: The distance between the end of the connecting ring (7) and the end of the heat exchange section (1) is half the width of the connecting sleeve (8).

4. A straight-through cold trap assembly for greenhouse gas sampling according to claim 1, characterized in that: The inner wall and the end of the connecting sleeve (8) are both fixed with sealing gaskets.

5. A straight-through cold trap assembly for greenhouse gas sampling according to claim 1, characterized in that: The cold ends of two adjacent semiconductor refrigerators (6) are in a staggered state, and the wind sprayed from the spray hole (5) blows onto the hot end of the adjacent semiconductor refrigerator (6).

6. A straight-through cold trap assembly for greenhouse gas sampling according to claim 1, characterized in that: The heat exchange section (1) is a straight-through structure, and the inner wall of the heat exchange section (1) and the outer surface of the droplet interception membrane (9) are both coated with a hydrophobic coating.

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