Waste gas collecting device with heat tracing mechanism and liquid sulfur storage tank thereof

Abstract

The utility model relates to the technical field of sulfur-containing natural gas purification, in particular to a waste gas collecting device with a heat tracing mechanism and a liquid sulfur storage tank of the waste gas collecting device. According to the waste gas collecting device with the heat tracing mechanism, a heat tracing jacket is sleeved outside a shell, and steam is input for heat tracing of the shell, so that a steam full heat tracing structure is formed; the temperature in the shell is increased, sulfur steam in the waste gas is not prone to condensing and blocking in the vent hole and the shell, the unfavorable conditions such as sulfur loss and equipment corrosion caused by the sulfur steam are avoided, the using effect of the waste gas collecting device is improved, the service life of the waste gas collecting device is prolonged, meanwhile, the structure is simple, the waste gas collecting device can be easily additionally arranged on an existing waste gas collecting device, and the cost is low. According to the liquid sulfur storage tank provided by the utility model, by adopting the waste gas collecting device with the heat tracing mechanism, the vent holes are not easy to block and corrode, the dissipated sulfur steam can be better collected, the environmental pollution is not easy to cause, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sulfur-containing natural gas purification, in particular to a waste gas collection device with a heating mechanism and a liquid sulfur storage tank thereof. Background Art

[0002] During the purification process of sour natural gas, liquid sulfur is usually stored in liquid sulfur storage tanks. Liquid sulfur storage tanks are generally vertical cylindrical atmospheric pressure equipment with several short circular vents on the top. The vents act as a breathing hole when the liquid level in the tank changes to ensure the safe storage of liquid sulfur in the tank. However, the vents are generally directly connected to the atmosphere. Waste gases such as hydrogen sulfide, sulfur dioxide, and sulfur vapor in the liquid sulfur can easily escape into the atmosphere through the vents. Without any other treatment, they can pollute the environment around the tank.

[0003] like Figure 1 As shown, Chinese utility model patent CN212830538U discloses a liquid sulfur waste gas collection auxiliary device and a liquid sulfur storage tank. The device comprises a housing having an air inlet and an air outlet. The air inlet is sealedly connected to the vent of the liquid sulfur storage tank, and the air outlet is sealedly connected to the exhaust pipe. During exhaust, air is supplied to the housing through the air supply port on the housing. This prevents exhaust gas from leaking out of the liquid sulfur waste gas collection auxiliary device during exhaust, thus preventing environmental pollution. However, during use, it was discovered that the liquid sulfur storage tank is generally equipped with a heating coil to ensure good fluidity of the liquid sulfur. This further exacerbates the generation of sulfur vapor. The sulfur vapor enters the exhaust gas collection auxiliary device through the vent, where its temperature decreases. Furthermore, the flow area between the vent and the exhaust gas collection auxiliary device changes. As a result, sulfur vapor easily condenses at the connection between the vent and the liquid sulfur waste gas collection device during use. Furthermore, the housing is difficult to clean, which can easily cause blockage above the vent and even corrode the exhaust gas collection auxiliary device, resulting in a reaction to form ferrous sulfide, which can cause a tank fire. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art that the vent holes of liquid sulfur storage tanks are prone to clogging and corrosion after adopting waste gas collection devices, and to provide a waste gas collection device with a heating mechanism and a liquid sulfur storage tank thereof.

[0005] In a first aspect, the utility model provides an exhaust gas collection device with a heating mechanism, comprising:

[0006] The shell is provided with an air outlet pipe on the top and at least one air inlet pipe on the bottom, and the air inlet pipe is used to connect to the vent hole of the storage tank;

[0007] The heating jacket is mounted on the shell to form a cavity between the shell and the heating jacket. The heating jacket is provided with a steam inlet and a condensation outlet communicating with the cavity. The steam inlet is connected to the steam supply pipe, the condensation outlet is connected to the steam recovery pipe, and the condensation outlet is provided with a valve.

[0008] The utility model discloses an exhaust gas collecting device with a heating mechanism. A heating jacket is installed on the outside of a shell, steam is input to heat the shell, and a steam full heating structure is formed. The temperature inside the shell is increased, and sulfur vapor in the exhaust gas is not easily condensed and blocked in the vent holes and the shell, thereby avoiding adverse conditions such as sulfur loss and equipment corrosion caused by condensation, and improving the use effect and service life of the exhaust gas collecting device. At the same time, the structure is simple and can be easily installed on the existing exhaust gas collecting device, thereby reducing the modification cost.

[0009] Preferably, the housing is provided with a first air supply port, the heating jacket is provided with a second air supply port, the first air supply port and the second air supply port are connected by a pipeline, and the second air supply port is provided with an adjustable pull plate. This ensures that the installation of the heating jacket does not affect the normal air supply during the exhaust gas extraction process, and by adding an appropriate amount of air, the hydrogen sulfide concentration in the exhaust gas collection device is prevented from exceeding the upper explosion limit. The size of the second air supply port can be conveniently adjusted by the adjustable pull plate to achieve air supply volume regulation.

[0010] Preferably, the shell is provided with a first pressure relief port, the heating jacket is provided with a second pressure relief port, the first and second pressure relief ports are connected by a pipe, the second pressure relief port is provided with a first pressure relief plate, and the first pressure relief plate is hingedly connected to the heating jacket. This ensures that the heating jacket does not affect the normal pressure relief of the shell when the internal pressure is excessive, and can be quickly opened in the event of excessive pressure inside the shell or an accident in the liquid sulfur storage tank.

[0011] Preferably, an adhesive member is provided between the first pressure relief plate and the heating jacket, so that the pressure in the shell needs to reach a certain limit before the first pressure relief plate is opened for pressure relief, thereby preventing harmful gases from escaping.

[0012] Preferably, the heating jacket is provided with a third pressure relief port, and the third pressure relief port is provided with a second pressure relief plate to achieve pressure relief, avoid damage to the shell and the heating jacket caused by excessive steam pressure in the cavity, and ensure the safety of the device.

[0013] Preferably, the heating jacket includes a jacket body, with a first pipe section disposed at the top and a second pipe section disposed at the bottom. The top of the first pipe section is provided with a first sealing plate abutting against the outer wall of the outlet pipe, and the bottom of the second pipe section is provided with a second sealing plate abutting against the outer wall of the inlet pipe. The steam inlet is provided in the first pipe section, and the condensate outlet is provided in the second pipe section. A cavity is formed between the first sealing plate and the second sealing plate, facilitating the arrangement of the steam inlet and the condensate outlet.

[0014] Preferably, at least two air inlet pipes are passed through the second pipe section, so that heating of multiple air inlet pipe positions can be achieved through a single heating jacket.

[0015] Preferably, the heating jacket is in the same shape as the shell, so as to form cavities with similar thickness at various positions, thereby ensuring uniform heating effect of the steam on the shell.

[0016] Preferably, the jacket body comprises an aluminum structural member and is provided with thermal insulation cotton, thereby further improving the heat tracing and heat preservation effect of the jacket body.

[0017] In a second aspect, the utility model provides a liquid sulfur storage tank, comprising a tank body, wherein the tank body is provided with a vent hole, and the vent hole is detachably connected to an exhaust gas collection device with a heating mechanism as described above.

[0018] The utility model provides a liquid sulfur storage tank. By adopting the above-mentioned exhaust gas collection device with a heating mechanism, the vent hole is not easily clogged or corroded, the escaped sulfur vapor can be well collected, and it is not easy to cause environmental pollution, and the service life is extended.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The utility model provides an exhaust gas collection device with a heating mechanism. By installing a heating jacket on the outside of the shell, steam is input to heat the shell, thereby increasing the temperature inside the shell. The sulfur vapor in the exhaust gas is less likely to condense and clog, reducing corrosion to the shell and improving the performance and service life of the exhaust gas collection device.

[0021] 2. The utility model provides an exhaust gas collection device with a heating mechanism. By installing a heating jacket on the outside of the shell, the structure is simple and can be easily installed on the existing exhaust gas collection device, reducing the modification cost.

[0022] 3. The utility model provides a liquid sulfur storage tank. By adopting the above-mentioned exhaust gas collection device with a heating mechanism, the vent hole is not easily blocked or corroded, the escaped sulfur vapor can be better collected, it is not easy to cause environmental pollution, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a liquid sulfur waste gas collection auxiliary device in the prior art;

[0024] Figure 2 This is a schematic cross-sectional view of an exhaust gas collection device with a heating mechanism according to the present invention;

[0025] Figure 3 for Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0026] Figure 4 A schematic diagram of the structure of an exhaust gas collection device with a heating mechanism according to Example 1 Figure 1 ;

[0027] Figure 5 A schematic diagram of the structure of an exhaust gas collection device with a heating mechanism according to Example 1 Figure 2 ;

[0028] Figure 6 This is a schematic structural diagram of a liquid sulfur storage tank according to Example 2;

[0029] Markings in the figure:

[0030] 1-shell, 11-air outlet pipe, 12-air inlet pipe, 13-first air supply port, 14-first pressure relief port, 2-heating jacket, 21-jacket body, 22-first pipe section, 221-steam inlet, 222-first sealing plate, 23-second pipe section, 231-condensation outlet, 232-second sealing plate, 24-second air supply port, 25-adjustable pull plate, 26-second pressure relief port, 261-first pressure relief plate, 27-third pressure relief port, 271-second pressure relief plate, 3-cavity, 4-steam supply pipe, 5-steam recovery pipe, 51-valve, 6-adhesive, 7-insulation cotton, 8-storage tank, 81-vent. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0032] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating orientation or positional relationships such as "upper," "lower," "left," "right," "center," "inside," and "outside" are based on the orientation or positional relationships shown in the accompanying drawings, or are the orientation or positional relationships in which the product / device / apparatus of the present invention is placed when it is conventionally used. These terms of orientation or positional relationships are merely for the purpose of facilitating the description of the present invention or simplifying the description of the specific embodiments to facilitate a quick understanding of the solutions by technicians, and do not indicate or imply that a particular device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, they should not be understood as limitations on the present invention.

[0033] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simply understood that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", and "parallel", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present utility model.

[0034] In addition, the expressions “first”, “second”, “third”, etc. in the terms are merely used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0035] In addition, in the description of the embodiments of the present invention, "several", "a plurality", and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0036] Furthermore, in the description of the technical solutions of this utility model, unless otherwise expressly specified / defined / restricted, the terms "disposed," "installed," "connected," "connected," "provided with," "laid," and "arranged" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be welding, riveting, bolting, threading, or other commonly used connection methods in the art. Such connections may be mechanical, electrical, or communication connections; they may be direct connections, indirect connections through an intermediate medium, or internal connections between two components.

[0037] Example 1

[0038] like Figures 1-6 As shown, an exhaust gas collection device with a heating mechanism includes a shell 1 and a heating jacket 2. The shell 1 is provided with an outlet pipe 11 on the top and an inlet pipe 12 at the bottom. The inlet pipe 12 is used to connect to the vent 81 of the storage tank 8; the heating jacket 2 is mounted on the shell 1 to form a cavity 3 between the shell 1 and the heating jacket 2. The heating jacket 2 is provided with a steam inlet 221 and a condensation outlet 231 connected to the cavity 3. The steam inlet 221 is connected to the steam supply pipe 4, and the condensation outlet 231 is connected to the steam recovery pipe 5. The condensation outlet 231 is provided with a valve 51.

[0039] The present embodiment provides an exhaust gas collection device with a heating mechanism. The shell 1 is an exhaust gas collection device used on an existing liquid sulfur storage tank 8, and includes a cubic body composed of an internal skeleton and a metal skin. Pyramidal sections are provided above and below the cubic body, respectively, for exhaust gas diversion. A metal hose is connected to the side of the pyramidal section away from the cubic body. The metal hose located below the shell 1 is flange-sealed to the vent 81 of the liquid sulfur storage tank 8. The metal hose located above the shell 1 is connected to an exhaust device for extracting sulfur-containing exhaust gas from the storage tank 8. The heating jacket 2 is an external structure mounted on the shell 1. The inner cavity is larger than the shell 1. A cavity 3 is formed between the shell 1 and the heating jacket 2 for introducing steam to heat the shell 1, thereby forming an exhaust gas collection device with a full steam heating structure. This increases the temperature inside the shell 1, and the sulfur vapor in the exhaust gas is not easily condensed and clogged in the vent 81 and the shell 1, thereby avoiding adverse conditions such as sulfur loss and equipment corrosion caused by the condensation, thereby improving the use effect and service life of the exhaust gas collection device. At the same time, the structure is simple and can be easily installed on the existing exhaust gas collection device, thereby reducing the modification cost.

[0040] In one or more embodiments, the shape of the heating jacket 2 can be cylindrical, cubic, or other shapes that can completely wrap the shell 1 .

[0041] In an optional embodiment, if Figure 2 As shown, the shape of the heating jacket 2 is consistent with that of the shell 1, and it has a jacket body 21 with a larger inner cavity than the shell 1. A pyramid-shaped guide section is provided above and below the jacket body 21, and a cylindrical first pipe section 22 and a second pipe section 23 are also provided for adapting to the air inlet pipe 12 and the air outlet pipe 11. After the heating jacket 2 is combined with the shell 1, a cavity 3 with a substantially similar thickness at each position is formed, ensuring a uniform heating effect of the steam on the shell 1 and facilitating the collection and output of the condensed steam near the air inlet pipe 12.

[0042] In an optional embodiment, the inclination angle of the pyramidal guide section is greater than the sulfur repose angle, which can ensure that when the insulation of the heating jacket 2 fails, the condensed sulfur element can slide into the liquid sulfur storage tank 8 under the action of gravity within a certain period of time to avoid blockage.

[0043] In an optional embodiment, the jacket body 21 includes an aluminum structure, and the jacket body 21 is provided with thermal insulation cotton 7, so as to further improve the heat tracing and heat preservation effect of the jacket body 21.

[0044] In an optional embodiment, if Figure 2As shown, a first sealing plate 222 is provided on the top of the first pipe section 22 to abut against the outer wall of the air outlet pipe 11, and a second sealing plate 232 is provided on the bottom of the second pipe section 23 to abut against the outer wall of the air inlet pipe 12. A sealing strip is provided on the side of the first sealing plate 222 that abuts against the outer wall of the air outlet pipe 11, and a sealing strip is provided on the side of the second sealing plate 232 that abuts against the outer wall of the air inlet pipe 12, so as to achieve the integrity and sealing of the cavity 3 and limit the range of the cavity 3 between the first sealing plate 222 and the second sealing plate 232.

[0045] In an optional embodiment, if Figure 4 、 Figure 5 As shown, the top of the first pipe section 22 and the bottom of the second pipe section 23 can continue to be connected to the metal hose for length extension, wherein the metal hose has good mobility and is not easy to generate stress, can better wrap the air outlet pipe 11 and the air inlet pipe 12 of the shell 1, can further expand the heating range of the heating jacket 2 to the shell 1, and is convenient for connection.

[0046] In one or more embodiments, the steam inlet 221 is arranged at the first pipe section 22, and the condensation outlet 231 is arranged at the second pipe section 23, which facilitates the arrangement of the steam inlet 221 and the condensation outlet 231, and the steam flows from top to bottom, and the exhaust gas in the liquid sulfur storage tank 8 is output from bottom to top, forming a heating with opposite flow directions, so that the steam has a better heating effect on the position farther away from the liquid sulfur storage tank 8, and accumulates at a position close to the vent 81, so that the exhaust gas output from the liquid sulfur storage tank 8 always has a certain temperature, and it is not easy to produce condensation blockage in the shell 1.

[0047] In an optional embodiment, the valve 51 may be a steam trap.

[0048] In one or several embodiments, more than two air inlet pipes 12 may be provided at the bottom of the shell 1, and the second pipe section 23 provided below the heating jacket 2 can enclose multiple air inlet pipes 12, so that steam heating of multiple air inlet pipes 12 can be achieved simultaneously through a single heating jacket 2.

[0049] In an optional embodiment, multiple second pipe sections 23 can be set under the heating jacket 2 according to the number of air inlet pipes 12, so that the air inlet pipes 12 pass through the second pipe sections 23 one by one, so as to achieve separate steam heating of the positions of multiple air inlet pipes 12.

[0050] In one or more embodiments, the shell 1 is provided with a first air supply port 13, the heating jacket 2 is provided with a second air supply port 24, the first air supply port 13 and the second air supply port 24 are connected by pipelines, and the second air supply port 24 is provided with an adjustable pull plate 25.

[0051] In an optional embodiment, the second air supply port 24 can be a long strip through hole arranged on the heating jacket 2, and the adjustable pull plate 25 can slide through a slide rail arranged on the side of the second air supply port 24. Sliding the adjustable pull plate 25 can change the size of the second air supply port 24, thereby realizing the adjustment of the air supply amount, so as to facilitate the addition of an appropriate amount of air and avoid the hydrogen sulfide concentration in the exhaust gas collection device exceeding the upper explosion limit.

[0052] In an optional embodiment, the first air supply port 13 is arranged at a higher position on the shell 1 than the second air supply port 24 is arranged on the heating jacket 2, so that an inclined air supply channel is formed, that is, the inlet of the air supply flow is lower than the outlet, so that when the exhaust gas is extracted by the exhaust device, a negative pressure is generated near the first air supply port 13, and the external air can smoothly enter the shell 1 without the exhaust gas escaping from the first air supply port 13, thereby forming a safe air supply process.

[0053] In one or more embodiments, the shell 1 is provided with a first pressure relief port 14, and the heating jacket 2 is provided with a second pressure relief port 26. The first pressure relief port 14 and the second pressure relief port 26 are connected by a pipe. The second pressure relief port 26 is provided with a first pressure relief plate 261, and the first pressure relief plate 261 is hingedly connected to the heating jacket 2. The provision of the heating jacket 2 does not affect the normal pressure relief of the shell 1 when the internal pressure is excessive.

[0054] In an optional embodiment, the first pressure relief port 14 can be a square through hole arranged on the cubic body of the shell 1, the second pressure relief port 26 is connected to the first pressure relief port 14 through a pipe, a rotating shaft is provided above the second pressure relief port 26, and the first pressure relief plate 261 is hinged to the rotating shaft. The second pressure relief port 26 is closed under the action of gravity and can be quickly opened when the internal pressure of the shell 1 is too high or the liquid sulfur storage tank 8 is in an accident state.

[0055] In an optional embodiment, an adhesive member 6 is provided between the first pressure relief plate 261 and the heating jacket 2. The first pressure relief plate 261 can be opened for pressure relief only after the pressure in the shell 1 reaches a certain limit, thereby preventing harmful gas from escaping when the pressure in the shell 1 is normal.

[0056] In an optional embodiment, the number of the second pressure relief ports 26 is consistent with the number of the first pressure relief ports 14 , and the number of the first pressure relief ports 14 may be one or more.

[0057] In one or more embodiments, the heating jacket 2 is provided with a third pressure relief port 27, which is provided with a second pressure relief plate 271. This serves to relieve pressure in the cavity 3, prevent damage to the shell 1 and the heating jacket 2 caused by excessive steam pressure within the cavity 3, and ensure the safety of the device. The second pressure relief plate 271 is installed in the same manner as the first pressure relief plate 261.

[0058] In an optional implementation manner, the position and number of each pressure relief port and air supply port can be adjusted according to actual conditions.

[0059] Example 2

[0060] like Figure 6 As shown, a liquid sulfur storage tank includes a storage tank body 8, and the storage tank body 8 is provided with a vent hole 81. The vent hole 81 can be detachably connected to an exhaust gas collection device with a heating mechanism as described above.

[0061] A liquid sulfur storage tank 8 of this embodiment adopts an exhaust gas collection device with a heating mechanism according to Example 1. The heating jacket 2 performs steam heating on the shell 1, so that the vent 81 is not easily clogged or corroded, the escaped sulfur vapor can be better collected, and it is not easy to cause environmental pollution. The service life can be extended.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An exhaust gas collection device with a heating mechanism, characterized in that: include: The housing (1) is provided with an air outlet pipe (11) at the top and at least one air inlet pipe (12) at the bottom, and the air inlet pipe (12) is used to connect to the air vent (81) of the storage tank (8); A heating jacket (2) is mounted on the shell (1), forming a cavity (3) between the shell (1) and the heating jacket (2). The heating jacket (2) is provided with a steam inlet (221) and a condensation outlet (231) communicating with the cavity (3). The steam inlet (221) is connected to a steam supply pipe (4), and the condensation outlet (231) is connected to a steam recovery pipe (5). The condensation outlet (231) is provided with a valve (51).

2. The exhaust gas collection device with a heating mechanism according to claim 1, characterized in that: The shell (1) is provided with a first air supply port (13), the heating jacket (2) is provided with a second air supply port (24), the first air supply port (13) and the second air supply port (24) are connected by a pipeline, and the second air supply port (24) is provided with an adjustable pull plate (25).

3. The exhaust gas collection device with a heating mechanism according to claim 1, characterized in that: The shell (1) is provided with a first pressure relief port (14), the heating jacket (2) is provided with a second pressure relief port (26), the first pressure relief port (14) and the second pressure relief port (26) are connected by a pipeline, the second pressure relief port (26) is provided with a first pressure relief plate (261), and the first pressure relief plate (261) is hinged to the heating jacket (2).

4. The exhaust gas collection device with a heating mechanism according to claim 3, characterized in that: An adhesive member (6) is provided between the first pressure relief plate (261) and the heating jacket (2).

5. The exhaust gas collection device with a heating mechanism according to claim 4, characterized in that: The heating jacket (2) is provided with a third pressure relief port (27), and the third pressure relief port (27) is provided with a second pressure relief plate (271).

6. An exhaust gas collection device with a heating mechanism according to any one of claims 1 to 5, characterized in that: The heating jacket (2) comprises a jacket body (21), wherein a first pipe section (22) is provided at the top of the jacket body (21) and a second pipe section (23) is provided at the bottom. A first sealing plate (222) is provided at the top of the first pipe section (22) and abuts against the outer wall of the outlet pipe (11). A second sealing plate (232) is provided at the bottom of the second pipe section (23) and abuts against the outer wall of the inlet pipe (12). A steam inlet (221) is provided at the first pipe section (22), and a condensation outlet (231) is provided at the second pipe section (23).

7. The exhaust gas collection device with a heating mechanism according to claim 6, characterized in that: At least two air inlet pipes (12) are arranged through the second pipe section (23).

8. The exhaust gas collection device with a heating mechanism according to claim 6, characterized in that: The heating jacket (2) is consistent in shape with the shell (1).

9. The exhaust gas collection device with a heating mechanism according to claim 6, characterized in that: The jacket body (21) comprises an aluminum structural member, and a heat-insulating cotton (7) is provided on the jacket body (21).

10. A liquid sulfur storage tank, comprising a tank (8) body, wherein the tank (8) body is provided with a vent hole (81), characterized in that: The vent hole (81) is detachably connected to the exhaust gas collecting device with a heating mechanism as described in claim 1.

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