Power plant carbon emission monitoring system

Abstract

The utility model relates to the technical field of carbon emission monitoring, discloses a power plant carbon emission monitoring system, and solves the problems that smoke needs to be introduced into a standby smoke pipeline in advance and reserved air in the pipeline needs to be treated in cooperation of flowing of smoke in the smoke pipeline and a back flushing system, so that the smoke treatment complexity is increased. Through the second smoke through hole and the butt joint cover, one smoke through pipeline is communicated, two openings of the U-shaped smoke through hole are respectively communicated with the other two smoke through pipelines, and when the vertical pump works, the correspondingly connected smoke through pipelines extract smoke in the chimney from the sampling box and transmit the smoke into an analysis instrument, so that detection is implemented; the ventilation assembly extracts clean gas and leads the clean gas to one end of the U-shaped smoke through hole through the L-shaped pipe, the other end of the U-shaped smoke through hole can generate suction force, smoke in the chimney is extracted and discharged back into the chimney along with the clean gas, circulation is formed, smoke detection is not affected by rotating the angle of the rotating cylinder, and meanwhile the problem of discharging reserved air in the standby smoke through pipeline is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon emission monitoring, in particular to a carbon emission monitoring system for a power plant. Background Art

[0002] Emission source monitoring for thermal power plants mainly refers to the act of monitoring greenhouse gas emissions from typical sources such as energy activities and industrial processes through monitoring means.

[0003] The detection system usually includes a sampling probe installed on the smoke exhaust chimney and an analytical instrument for online carbon emission monitoring installed in the machine room. The sampling probe and the analytical instrument are usually connected by a heating pipe. The heating pipe is used to ensure that the flue gas sample remains in its original state during the transmission from the sampling point to the analytical instrument, especially to prevent the condensation of moisture and acidic gases in the flue gas. As the flue gas circulates, in order to consider cleaning the sampling probe and the inner wall of the heating pipe, a backflush system is usually set up. That is, two heating pipes are usually set up, or at least two smoke ducts are set in the heating pipe. Inert gas or clean air is introduced into one of the pipes at high speed in the reverse direction to blow out the particulate dust. Then, by alternating operations, the dust in the pipe is effectively cleaned without interrupting the flue gas detection of the analytical instrument.

[0004] When two smoke ducts are operated alternately, flue gas must be introduced into the analytical instrument at the same time before alternating to ensure that the smoke layer can be connected when the analytical instrument is connected to the other smoke duct, thereby ensuring the continuity of CO2 detection. However, during the advance ventilation of the other smoke duct, the emission treatment of the reserved air in the duct must be considered. Therefore, the advance ventilation time needs to be calculated, and then coordinated with the alternating switching, and additional flue gas treatment equipment is required, which further increases the complexity of flue gas treatment. Utility Model Content

[0005] The purpose of the utility model is to provide a carbon emission monitoring system for a power plant, which solves the problem in the existing carbon emission monitoring system that, in the coordination of the flow of flue gas in the flue gas duct and the backflush system, the spare flue gas duct needs to be ventilated in advance and the reserved air in the duct needs to be processed, which increases the complexity of flue gas processing.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a power plant carbon emission monitoring system, comprising a sampling box fixedly mounted on the outer wall of a chimney, an analytical instrument disposed in a machine room, a heat tracing pipe B connected between the sampling box and the analytical instrument, a backflush mechanism connected to one end of the heat tracing pipe B near the analytical instrument, and the backflush mechanism connected to an air supply mechanism;

[0007] The heating pipe B includes three smoke ducts, wherein a heating wire for heating is provided in the middle of the three smoke ducts, and a wrapping outer layer is provided on the periphery of the smoke ducts. The interior of the wrapping outer layer and the space between the smoke ducts and the heating wires are filled with a heat-insulating filler for heat preservation;

[0008] The back-blowing mechanism includes a docking component A docked with the three smoke ventilation pipes, and a direction-adjusting component for adjusting the direction of smoke ventilation is rotatably provided on one side of the docking component A. The direction-adjusting component includes a rotating cylinder rotatably provided on one side of the docking component A, and a second smoke ventilation hole and a U-shaped smoke ventilation hole are provided on one side of the rotating cylinder. A vertical pump is installed in the second smoke ventilation hole, and a docking cover is rotatably connected to one side of the direction-adjusting component, and the docking cover is connected to the analytical instrument. A ventilation component is provided on the outer surface of the direction-adjusting component, and an L-shaped tube is provided in the U-shaped smoke ventilation hole to be connected to the ventilation component, and the ventilation component is connected to the air supply mechanism.

[0009] Preferably, the docking assembly A includes a docking tube, and three first smoke holes are evenly and evenly opened in a ring shape on the side surface of the docking tube. The three first smoke holes are correspondingly connected to the second smoke holes and the two ends of the U-shaped smoke holes. The other end of the first smoke holes is connected to the smoke pipe through the docking joint A. A progressive motor is fixedly installed on the upper surface of the docking tube, and a gear ring is fixedly sleeved on the outer surface of the rotating tube. The output end of the progressive motor is provided with a gear meshing with the gear ring.

[0010] Preferably, a penetrating trumpet hole is provided on the side surface of the docking cover, the larger side of the trumpet hole is connected to the rotating second smoke hole, and the other side of the trumpet hole is connected to the analysis instrument through the docking joint B.

[0011] Preferably, the cross-sectional diameter of the L-shaped tube is smaller than that of the U-shaped smoke hole, one side of the L-shaped tube is coaxially arranged with the other side of the U-shaped smoke hole, and the other end of the L-shaped tube passes through the outer surface of the rotating cylinder.

[0012] Preferably, the U-shaped smoke vent is provided with an inner wall of one side of the L-shaped tube fixedly connected to a Venturi tube, and the narrow position of the inner wall of the Venturi tube is close to the outlet of the L-shaped tube.

[0013] Preferably, a spherical electronic valve is installed on the inner wall of the pipe on the side of the U-shaped smoke hole away from the L-shaped pipe.

[0014] Preferably, the ventilation assembly includes an annular cover rotatably mounted on the surface of the rotating cylinder, a semi-open cavity in the shape of an annular shape is provided on the inner side of the annular cover, a sealing ring is fixedly provided on the surface of the rotating cylinder, the sealing ring is rotatably sealed and connected to the semi-open cavity inside the annular cover, one end of the L-shaped tube passes through the sealing ring and is connected to the semi-open cavity inside the annular cover, an air pump is fixedly mounted on one side of the sealing ring, and the air pump is connected to the air supply mechanism.

[0015] Preferably, a filter is provided at one end of the heating pipe B close to the sampling box, and three groups of filter units are provided in the filter, which are respectively connected to the three smoke ducts.

[0016] Preferably, there are multiple sampling boxes, and the multiple sampling boxes are horizontally and evenly distributed in a ring around the periphery of the chimney. The sampling boxes are connected to the filter through the heating pipe A. The multiple heating pipes A are equidistantly arranged, and the heating pipes A and the heating pipes B have the same structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The utility model provides a carbon emission monitoring system for a power plant, wherein a docking cover is connected to a smoke duct through a docking component A via a second smoke vent, and two openings of the U-shaped smoke vent are respectively connected to the other two smoke ducts via the docking component A. When the vertical pump is working, it can extract the flue gas in the chimney from the sampling box through the corresponding connected smoke duct and transmit it to the analysis instrument to implement CO2 concentration detection. When the ventilation component extracts clean gas through the L-shaped tube to one end of the U-shaped smoke vent, suction is generated at the other end, so that the clean gas is discharged from one end of the U-shaped smoke vent, which will cause the smoke duct connected to it to be cleaned. The U-shaped smoke hole can also be used to clean the smoke, and the other end that generates suction acts on the corresponding smoke pipe, which will also extract the smoke in the chimney and discharge it back into the chimney with the clean gas, thus forming a cycle. When the angle of the rotating cylinder is rotated to make the second smoke hole connect with the smoke pipe originally connected to the air extraction end of the U-shaped smoke hole, the smoke laminar flow can be connected without affecting the continuity of CO2 content detection, and the two ends of the U-shaped smoke hole will act on the two newly connected smoke pipes to achieve the corresponding effect, thereby achieving the goal of not affecting the continuity of the CO2 content detection of the flue gas, and also solving the discharge problem of the reserved air in the spare smoke pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the carbon emission monitoring system of the present utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the heat tracing pipe B of the present invention;

[0021] Figure 3 This is a schematic structural diagram of the backflush mechanism of the present utility model;

[0022] Figure 4 This is a schematic diagram of the exploded structure of the back-blowing mechanism of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the steering assembly of the present utility model;

[0024] Figure 6 This is a schematic diagram of the horizontal section and exploded structure of the rotating drum of the present invention;

[0025] Figure 7 This is a schematic diagram of the cross-sectional structure of the docking cover of the present invention.

[0026] In the figure: 1. Sampling box; 2. Heating pipe A; 3. Heating pipe B; 31. Smoke duct; 32. Heating wire; 33. Insulation filler; 34. Outer wrapping layer; 4. Analytical instrument; 5. Filter; 6. Backflush mechanism; 61. Docking assembly A; 611. Docking cylinder; 612. Docking joint A; 613. First smoke vent; 62. Direction adjustment assembly; 621. Rotating cylinder; 622. Gear ring; 623. Second smoke vent; 624. U-shaped smoke vent; 625. Spherical electronic valve; 626. L-shaped pipe; 627. Venturi pipe; 63. Docking cover; 631. Horn hole; 632. Docking joint B; 64. Ventilation assembly; 641. Air pump; 642. Ring cover; 643. Sealing ring; 65. Progressive motor; 7. Vertical pump. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0029] Example 1

[0030] See also Figure 1-Figure 7 A power plant carbon emission monitoring system includes a sampling box 1 fixedly mounted on the outer wall of a chimney, an analysis instrument 4 arranged in a machine room, a heat tracing pipe B3 connected between the sampling box 1 and the analysis instrument 4, and a backflush mechanism 6 connected to an air supply mechanism at one end of the heat tracing pipe B3 close to the analysis instrument 4.

[0031] The heat tracing pipe B3 includes three smoke ducts 31. A heating wire 32 is provided between the three smoke ducts 31 for heating. An outer wrapping layer 34 is provided around the smoke ducts 31. An insulating filler 33 is filled between the outer wrapping layer 34 and the smoke ducts 31 and the heating wire 32 for heat preservation.

[0032] The back-blowing mechanism 6 includes a docking component A61 docked with three smoke ducts 31. A direction-adjusting component 62 for adjusting the direction of smoke ventilation is rotatably provided on one side of the docking component A61. The direction-adjusting component 62 includes a rotating cylinder 621 rotatably provided on one side of the docking component A61. A second smoke hole 623 and a U-shaped smoke hole 624 are provided on one side of the rotating cylinder 621. A vertical pump 7 is installed in the second smoke hole 623. A docking cover 63 is rotatably connected to one side of the direction-adjusting component 62. The docking cover 63 is connected to the analytical instrument 4. A ventilation component 64 is provided on the outer surface of the direction-adjusting component 62. An L-shaped tube 626 is provided in the U-shaped smoke hole 624 and is connected to the ventilation component 64. The ventilation component 64 is connected to the air supply mechanism.

[0033] The above working principle and technical effect are as follows: the second smoke hole 623 connects the docking cover 63 with a smoke duct 31 through the docking component A61, and the two openings of the U-shaped smoke hole 624 are respectively connected with the other two smoke ducts 31 through the docking component A61. When the vertical pump 7 is working, it can extract the flue gas in the chimney from the sampling box 1 through the corresponding connected smoke duct 31 and transmit it to the analyzer 4 to implement CO2 concentration detection. The gas supply mechanism is used to provide inert gas or clean air as cleaning gas. When the ventilation component 64 extracts the clean gas through the L-shaped tube 626 to one end of the U-shaped smoke hole 624, the other end will generate suction, so that the clean gas is discharged from one end of the U-shaped smoke hole 624, and it will The smoke duct 31 corresponding to it is cleaned, and the other end that generates suction acts on the smoke duct 31 corresponding to it, which will also extract the smoke in the chimney and discharge it back into the chimney with the clean gas, thereby forming a cycle. When the angle of the rotating cylinder 621 is rotated so that the second smoke hole 623 is connected to the smoke duct 31 originally connected to the air extraction end of the U-shaped smoke hole 624, the smoke laminar flow can be connected without affecting the continuity of the CO2 content detection. The two ends of the U-shaped smoke hole 624 will act on the two newly connected smoke ducts 31 to achieve the corresponding effect, thereby achieving the goal of not affecting the continuity detection of the CO2 content of the flue gas while solving the problem of discharging the reserved air in the spare smoke duct 31.

[0034] In the previous embodiment: the docking assembly A61 includes a docking tube 611, and three first smoke holes 613 are evenly arranged in a ring shape on the side surface of the docking tube 611. The three first smoke holes 613 are correspondingly connected to the second smoke holes 623 and the U-shaped smoke holes 624 at both ends. The other end of the first smoke holes 613 is connected to the smoke pipe 31 through the docking joint A612. A progressive motor 65 is fixedly installed on the upper surface of the docking tube 611, and a gear ring 622 is fixedly provided on the outer surface of the rotating tube 621. The output end of the progressive motor 65 is provided with a gear that first meshes with the gear ring 622.

[0035] Specifically, the gear ring 622 is driven by the stepping motor 65 to drive the rotating cylinder 621 to rotate, and the rotating cylinder 621 rotates one hundred and twenty degrees each time.

[0036] In the previous embodiment, a penetrating trumpet hole 631 is provided on the side surface of the docking cover 63. The larger opening of the trumpet hole 631 is connected to the rotating second smoke hole 623, and the other opening of the trumpet hole 631 is connected to the analysis instrument 4 through the docking joint B632.

[0037] Specifically, by opening the trumpet hole 631, when the second smoke hole 623 is rotated to be connected to another smoke duct 31, one side thereof remains connected to the trumpet hole 631, so that the smoke duct 31 that is reconnected with the second smoke hole 623 that has changed its position can have the smoke flowing inside it smoothly input into the analyzer 4 through the trumpet hole 631 for detection.

[0038] In the previous embodiment: the cross-sectional diameter of the L-shaped tube 626 is smaller than the cross-sectional diameter of the U-shaped smoke hole 624, one side of the L-shaped tube 626 is coaxially arranged with the one side of the U-shaped smoke hole 624, and the other end of the L-shaped tube 626 passes through the outer surface of the rotating cylinder 621.

[0039] In the previous embodiment, the U-shaped smoke hole 624 is provided with a venturi pipe 627 fixedly connected to the inner wall of one side of the L-shaped pipe 626 , and the narrow position of the inner wall of the venturi pipe 627 is close to the outlet of the L-shaped pipe 626 .

[0040] Specifically, through the setting of the Venturi pipe 627, when the clean gas is injected into the pipe on one side of the U-shaped smoke hole 624 from the L-shaped pipe 626, it is convenient to accelerate the flow of gas, thereby facilitating the improvement of the suction force on the other side of the U-shaped smoke hole 624, thereby improving the effect of extracting smoke at this end.

[0041] In the previous embodiment, a spherical electronic valve 625 is installed on the inner wall of the U-shaped smoke hole 624 away from the L-shaped tube 626 .

[0042] Specifically, by controlling the spherical electronic valve 625, it can be made to close the channel on the corresponding side of the U-shaped smoke vent 624 and open it only within the corresponding time before rotating the rotating cylinder 621. The corresponding time is based on the suction force at one end of the U-shaped smoke vent 624, which prompts the flue gas in the chimney to pass through the smoke duct 31 to reach the position of the spherical electronic valve 625. Before this, the spherical electronic valve 625 can be closed, so that the clean gas introduced by the L-shaped tube 626 only acts efficiently on the smoke duct 31 and the corresponding connected sampling box 1 for dust collection and cleaning.

[0043] In the previous embodiment: the ventilation component 64 includes an annular cover 642 rotatably mounted on the surface of the rotating cylinder 621, and an annular semi-open cavity is provided on the inner side of the annular cover 642. A sealing ring 643 is fixedly provided on the surface of the rotating cylinder 621. The sealing ring 643 is rotatably sealed and connected to the semi-open cavity inside the annular cover 642. One end of the L-shaped tube 626 passes through the sealing ring 643 and is connected to the semi-open cavity inside the annular cover 642. An air pump 641 is fixedly mounted on one side of the sealing ring 643, and the air pump 641 is connected to the air supply mechanism.

[0044] Specifically, the air pump 641 injects the clean gas connected to the air supply mechanism into the cavity inside the annular cover 642. Due to the sealing of the sealing ring 643, the clean air enters from the inlet of the L-shaped tube 626 and is output to the inner side of the U-shaped smoke vent 624. The sealing ring 643 is connected to the sealed rotation of the annular cover 642, so that when the rotating cylinder 621 rotates inside the annular cover 642, it does not affect the injection of the clean gas into the L-shaped tube 626.

[0045] Example 2

[0046] Reference Figure 1 、 2 A filter 5 is provided at one end of the heat tracing pipe B3 close to the sampling box 1. The filter 5 has three groups of filter units, which are respectively connected to the three smoke pipes 31.

[0047] Multiple sampling boxes 1 are provided, evenly distributed horizontally and in a circular pattern around the chimney. Each sampling box 1 is connected to the filter 5 via equidistantly spaced heat tracing pipes A2, which share the same structure as heat tracing pipes B3. The connection between the vent pipe inside heat tracing pipe A2, which is equivalent to the smoke duct 31 inside heat tracing pipe B3, and the filter 5 is the same as described above.

[0048] The above working principle and technical effect are: in view of the uneven flue gas concentration in the same plane in the chimney pipe, which may easily lead to errors in sample extraction, multiple sampling boxes 1 are arranged in a circular and even manner on the periphery of the chimney, so that the flue gas in the chimney pipe can be evenly extracted. By setting the heating pipe A2 of equal length, the flue gas in the same laminar flow can reach the filter 5 at the same time. The filter 5 is used to filter the dust particles in the flue gas. In the filtration unit filtration, the flue gas transmitted by multiple heating pipes A2 can be mixed, and then input into the back-blowing mechanism 6 through the smoke pipe 31. Through the setting of the filter 5, the dust will be trapped in the area where the sampling box 1, the heating pipe A2, and the filter 5 are located. When the back-blowing effect is achieved by the filter 5, it is easier to blow the dust in the area where the sampling box 1, the heating pipe A2, and the filter 5 are located back into the chimney, thereby improving the cleaning effect.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power plant carbon emission monitoring system, characterized by: The invention comprises a sampling box (1) fixedly mounted on the outer wall of a chimney, an analysis instrument (4) arranged in a machine room, a heat tracing pipe B (3) connected between the sampling box (1) and the analysis instrument (4), a back-flushing mechanism (6) connected to one end of the heat tracing pipe B (3) close to the analysis instrument (4), and the back-flushing mechanism (6) connected to an air supply mechanism; The heating pipe B (3) comprises three smoke ducts (31), wherein electric heating wires (32) for heating are arranged in the middle of the three smoke ducts (31), an outer wrapping layer (34) is arranged on the periphery of the smoke ducts (31), and an insulating filler (33) for heat preservation is filled between the inner portion of the outer wrapping layer (34) and the smoke ducts (31) and the electric heating wires (32); The back-blowing mechanism (6) includes a docking assembly A (61) docked with the three smoke ducts (31), a direction adjustment assembly (62) for adjusting the smoke direction is rotatably provided on one side of the docking assembly A (61), the direction adjustment assembly (62) includes a rotating cylinder (621) rotatably provided on one side of the docking assembly A (61), a second smoke hole (623) and a U-shaped smoke hole (624) are provided on one side of the rotating cylinder (621), a vertical pump (7) is installed in the second smoke hole (623), a docking cover (63) is rotatably connected to one side of the direction adjustment assembly (62), the docking cover (63) is connected to the analytical instrument (4), a ventilation assembly (64) is provided on the outer surface of the direction adjustment assembly (62), an L-shaped tube (626) is provided in the U-shaped smoke hole (624) and is connected to the ventilation assembly (64), and the ventilation assembly (64) is connected to the air supply mechanism.

2. A power plant carbon emission monitoring system according to claim 1, characterized in that: The docking assembly A (61) includes a docking tube (611), and three first smoke holes (613) are evenly and annularly formed on the side surface of the docking tube (611). The three first smoke holes (613) are correspondingly connected to the second smoke holes (623) and the U-shaped smoke hole (624) at both ends. The other end of the first smoke holes (613) is connected to the smoke pipe (31) through a docking joint A (612). A progressive motor (65) is fixedly mounted on the upper surface of the docking tube (611), and a gear ring (622) is fixedly sleeved on the outer surface of the rotating tube (621). The output end of the progressive motor (65) is provided with a gear that meshes with the gear ring (622).

3. A power plant carbon emission monitoring system according to claim 2, characterized in that: A penetrating trumpet hole (631) is provided on the side surface of the docking cover (63); the larger side of the trumpet hole (631) is connected to the rotating second smoke hole (623); the other side of the trumpet hole (631) is connected to the analytical instrument (4) via a docking joint B (632).

4. The power plant carbon emission monitoring system according to claim 1, characterized in that: The cross-sectional diameter of the L-shaped tube (626) is smaller than the cross-sectional diameter of the U-shaped smoke hole (624); one side of the L-shaped tube (626) is coaxially arranged with the other side of the U-shaped smoke hole (624); and the other end of the L-shaped tube (626) penetrates the outer surface of the rotating cylinder (621).

5. A power plant carbon emission monitoring system according to claim 4, characterized in that: The U-shaped smoke hole (624) is provided with an inner wall of a pipe on one side of an L-shaped pipe (626) fixedly connected to a venturi pipe (627), and the narrow position of the inner wall of the venturi pipe (627) is close to the outlet of the L-shaped pipe (626).

6. A power plant carbon emission monitoring system according to claim 5, characterized in that: A spherical electronic valve (625) is installed on the inner wall of the pipe on the side of the U-shaped smoke hole (624) away from the L-shaped pipe (626).

7. The power plant carbon emission monitoring system according to claim 1, characterized in that: The ventilation assembly (64) includes an annular cover (642) rotatably mounted on the surface of the rotating cylinder (621), an annular semi-open cavity is provided on the inner side of the annular cover (642), a sealing ring (643) is fixedly provided on the surface of the rotating cylinder (621), the sealing ring (643) is rotatably sealed and connected to the semi-open cavity inside the annular cover (642), one end of the L-shaped tube (626) passes through the sealing ring (643) and is connected to the semi-open cavity inside the annular cover (642), an air pump (641) is fixedly mounted on one side of the sealing ring (643), and the air pump (641) is connected to the air supply mechanism.

8. The power plant carbon emission monitoring system according to claim 1, characterized in that: A filter (5) is provided at one end of the heating pipe B (3) close to the sampling box (1), and three groups of filter units are provided in the filter (5), which are respectively connected to the three smoke ducts (31).

9. The power plant carbon emission monitoring system according to claim 8, characterized in that: There are multiple sampling boxes (1), and the multiple sampling boxes (1) are horizontally and evenly distributed in a circular shape on the periphery of the chimney. The sampling boxes (1) are connected to the filter (5) through a heating pipe A (2). The multiple heating pipes A (2) are equidistantly arranged, and the heating pipes A (2) have the same structure as the heating pipe B (3).

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