Biogas cooler

Abstract

The utility model discloses a marsh gas cooler, which relates to the field of marsh gas treatment, and solves the problems that in the prior art, air cooling is used for cooling marsh gas, but is limited by heat conductivity and heat transfer efficiency of air, and compared with liquid cooling and air cooling, the heat dissipation efficiency is generally lower, the marsh gas cooler comprises a shell, and the upper end and the lower end of the shell are respectively provided with an upper plug and a lower plug; a heat exchange structure is arranged in the shell, an air inlet is formed in the top of the upper plug, an air outlet is formed in the lower portion of the lower plug, a cooling water outlet is formed in the upper portion of the shell, and a cooling water inlet is formed in the lower portion of the shell. According to the utility model, cooling water enters from the lower gas outlet and is discharged from the upper gas inlet, and methane enters from the upper cooling water outlet and is discharged from the lower cooling water inlet, so that the methane and the cooling water are in countercurrent contact; and the biogas to be cooled continuously meets the exchanged cooling water, so that a relatively large concentration gradient is favorably maintained, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of biogas treatment, in particular to a biogas cooler. Background Art

[0002] Biogas is mainly composed of methane and carbon dioxide. Its actual production process is mainly through anaerobic digestion. Since this process is carried out in a liquid environment, water vapor will dissolve in the biogas due to physical absorption. Therefore, as the biogas is generated and rises, part of the water vapor will be carried out with the biogas, so the generated biogas will carry a certain amount of water vapor.

[0003] During the production process, biogas contains a large amount of water vapor and some harmful impurities, such as hydrogen sulfide, carbon dioxide, etc. Through cooling, the water vapor can be effectively condensed and removed, and it also helps to reduce the content of some impurities, thereby improving the purity and calorific value of biogas.

[0004] In the patent application with publication number CN206127234U, an air cooler for biogas pretreatment is disclosed, which includes: a heat exchange tube group, which is composed of a plurality of heat exchange tubes, and the plurality of heat exchange tubes are arranged in parallel at intervals; one end of the heat exchange tube is connected to a first merging device, and the other end of the heat exchange tube is connected to a second merging device; an air inlet pipe, which is connected to the first merging device and is used to introduce biogas with a higher temperature; an air outlet pipe, which is connected to the second merging device and is used to export biogas with a lower temperature; a cooling fan, which blows air toward the heat exchange tube group to dissipate heat from the heat exchange tube group.

[0005] In the above patent, the biogas with a higher temperature is introduced into the heat exchange tube through the air inlet pipe, and the temperature is reduced by the cold air blown by the cooling fan at the heat exchange tube. Then, the biogas with a lower temperature is discharged from the air outlet pipe. The water vapor in the biogas is condensed by cooling the biogas, and then separated from the biogas. However, due to the limitations of the thermal conductivity and heat transfer efficiency of air, the heat dissipation efficiency of air cooling is usually lower than that of liquid cooling. Utility Model Content

[0006] The utility model aims to provide a biogas cooler to solve the problem that in the prior art, biogas is cooled by air cooling, but the heat dissipation efficiency of air cooling is usually lower than that of liquid cooling due to the limitations of the thermal conductivity and heat transfer efficiency of air.

[0007] The technical solution adopted by the utility model is as follows: a biogas cooler comprises a shell, an upper plug and a lower plug are respectively arranged at the upper and lower ends of the shell, a heat exchange structure is arranged in the shell, an air inlet is arranged at the top of the upper plug, an air outlet is arranged at the bottom of the lower plug, a cooling water outlet is arranged at the upper part of the shell, and a cooling water inlet is arranged at the lower part of the shell;

[0008] The heat exchange structure includes a tube sheet, a heat exchange tube and a partition. The tube sheets are arranged at both ends of the shell. A plurality of heat exchange tubes are arranged in parallel along the vertical direction between the tube sheets. The upper and lower ends of the heat exchange tubes pass through the tube sheets and are respectively connected to the inner cavities of the upper plug and the lower plug. A support rod is also arranged in the vertical direction above the tube sheet located below. The partition is fixed in the horizontal direction on the support rod and the heat exchange tube, and the other end of the partition is connected to the heat exchange tube.

[0009] Furthermore, a cleaning water inlet pipe is arranged above the shell, and a cleaning water outlet pipe is arranged below the shell.

[0010] Furthermore, the upper plug and the lower plug are both detachably connected to the shell.

[0011] Furthermore, a sewage pipe is provided at the bottom of the shell.

[0012] Furthermore, adjacent partitions are arranged in a staggered manner.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] 1. In the utility model, since the cooling water enters from the lower air outlet and is discharged from the upper air inlet, the biogas enters from the upper cooling water outlet and is discharged from the lower cooling water inlet, so that the biogas and the cooling water are in countercurrent contact. Since the biogas to be cooled continuously meets the already exchanged cooling water in the entire contact area, it helps to maintain a larger concentration gradient and improve the heat exchange efficiency;

[0015] 2. In order to facilitate cleaning and discharge condensed water, the utility model is provided with a cleaning water inlet pipe above the shell and a cleaning water outlet pipe below the shell. Cleaning water is discharged into the shell through the cleaning water inlet pipe to clean the shell and the heat exchange tube, and the cleaning water and condensed water are discharged through the cleaning water outlet pipe;

[0016] 3. In order to facilitate the cleaning of the heat exchange tube, the upper plug and the lower plug are detachably connected to the shell, which is convenient for cleaning the heat exchange tube after disassembly. At the same time, in order to discharge the dirt precipitated in the lower plug, a sewage pipe is provided at the bottom;

[0017] 4. In the utility model, adjacent partitions are staggered to divide the shell into several spaces, guiding the biogas to flow between the ends of the partitions and the inner wall of the shell, increasing the contact area and turbulence between the biogas and the wall of the heat exchange tube, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Description of reference numerals:

[0020] 1. Shell; 2. Upper plug; 3. Air inlet; 4. Tube sheet; 5. Heat exchange tube; 6. Partition; 7. Cleaning water outlet pipe; 8. Cleaning water inlet pipe; 9. Air outlet; 10. Lower plug; 11. Drain pipe; 12. Cooling water inlet; 13. Cooling water outlet; 14. Support rod. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] Figure 1 As shown: a biogas cooler comprises a shell 1, an upper plug 2 and a lower plug 10 are respectively provided at the upper and lower ends of the shell 1, a heat exchange structure is provided in the shell 1, an air inlet 3 is provided at the top of the upper plug 2, an air outlet 9 is provided at the lower part of the lower plug 10, a cooling water outlet 13 is provided at the upper part of the shell 1, and a cooling water inlet 12 is provided at the lower part of the shell 1.

[0025] The heat exchange structure includes a tube sheet 4, a heat exchange tube 5 and a partition 6. The tube sheet 4 is arranged at both ends of the shell 1. A plurality of heat exchange tubes 5 are arranged in parallel along the vertical direction between the tube sheets 4. The upper and lower ends of the heat exchange tube 5 pass through the tube sheet 4 and are respectively connected to the inner cavities of the upper plug 2 and the lower plug 10. A support rod 14 is also arranged in the vertical direction above the tube sheet 4 located below. A partition 6 is fixed in the horizontal direction on the support rod 14 and the heat exchange tube 5. The other end of the partition 6 is connected to the heat exchange tube 5.

[0026] The cooling water first enters the lower plug 10 from the air outlet 9, then moves upward through the heat exchange tubes 5 into the lower plug 10, and is discharged through the air inlet 3. The biogas to be cooled enters the shell 1 from the cooling water outlet 13, and heat is exchanged between the tube wall of the heat exchange tube 5 and the cooling water therein, thereby cooling the biogas. The cooled biogas is discharged from the cooling water inlet 12 below.

[0027] Since the cooling water enters from the lower air outlet 9 and is discharged from the upper air inlet 3, the biogas enters from the upper cooling water outlet 13 and is discharged from the lower cooling water inlet 12, thereby making the biogas and cooling water in countercurrent contact. Since in the entire contact area, the biogas to be cooled continuously meets the cooling water that has been exchanged, it helps to maintain a larger concentration gradient and improve the heat exchange efficiency.

[0028] Example 2

[0029] The difference between this embodiment and embodiment 1 is that: during the generation process of biogas, some solid particles may be carried by biogas, such as incompletely decomposed organic residues, etc., resulting in poor cleanliness, thus causing the inside of the shell 1 and the surface of the heat exchange tube 5 to be dirty. Therefore, in order to facilitate cleaning thereof and to discharge condensed water, a cleaning water inlet pipe 8 is provided above the shell 1, and a cleaning water outlet pipe 7 is provided below the shell 1. Cleaning water is discharged into the shell 1 through the cleaning water inlet pipe 8 to clean the shell 1 and the heat exchange tube 5, and the cleaning water and condensed water are discharged through the cleaning water outlet pipe 7.

[0030] Example 3

[0031] The difference between this embodiment and embodiment 1 is that the heat exchange tube 5 will be blocked after being used for a period of time. In order to facilitate the cleaning of the heat exchange tube 5, the upper plug 2 and the lower plug 10 are both detachably connected to the shell 1, which facilitates the cleaning of the heat exchange tube 5 after disassembly. At the same time, in order to discharge the dirt deposited in the lower plug 10, a drain pipe 11 is provided at the bottom thereof.

[0032] Example 4

[0033] The difference between this embodiment and embodiment 1 is that adjacent partitions 6 are staggered to divide the shell 1 into several spaces, guiding the biogas to flow between the ends of the partitions 6 and the inner wall of the shell 1, increasing the contact area and turbulence between the biogas and the wall of the heat exchange tube 5, thereby improving the heat exchange efficiency.

[0034] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A biogas cooler, characterized in that: It comprises a shell (1), wherein the upper and lower ends of the shell (1) are respectively provided with an upper plug (2) and a lower plug (10), a heat exchange structure is provided inside the shell (1), an air inlet (3) is provided at the top of the upper plug (2), an air outlet (9) is provided at the bottom of the lower plug (10), a cooling water outlet (13) is provided at the top of the shell (1), and a cooling water inlet (12) is provided at the bottom of the shell (1); The heat exchange structure comprises a tube sheet (4), a heat exchange tube (5) and a partition (6); the tube sheet (4) is arranged at both ends of the shell (1); a plurality of heat exchange tubes (5) are arranged in parallel along the vertical direction between the tube sheets (4); the upper and lower ends of the heat exchange tube (5) pass through the tube sheet (4) and are respectively connected to the inner cavities of the upper plug (2) and the lower plug (10); a support rod (14) is also arranged above the tube sheet (4) at the bottom in the vertical direction; the partition (6) is fixed to the support rod (14) and the heat exchange tube (5) in the horizontal direction; the other end of the partition (6) is connected to the heat exchange tube (5).

2. A biogas cooler according to claim 1, characterized in that: A cleaning water inlet pipe (8) is arranged above the shell (1), and a cleaning water outlet pipe (7) is arranged below the shell (1).

3. A biogas cooler according to claim 1, characterized in that: The upper plug (2) and the lower plug (10) are both detachably connected to the shell (1).

4. A biogas cooler according to claim 1, characterized in that: A sewage discharge pipe (11) is provided at the bottom of the shell (1).

5. A biogas cooler according to claim 1, characterized in that: The adjacent partitions (6) are arranged in a staggered manner.

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