Device for monitoring state of gas heat exchanger in real time and novel steel rolling heating furnace system

Abstract

The utility model discloses a device for monitoring the state of a gas heat exchanger in real time, and belongs to the related technical field of safe operation detection of metal material heat treatment equipment. The gas flow measuring device is used for measuring the gas flow; and the monitoring equipment is in signal connection with the carbon monoxide concentration monitoring device and the coal gas flow measuring device. The utility model further provides a novel steel rolling heating furnace system provided with the device. Required parameters can be acquired in real time through the carbon monoxide concentration monitoring device and the gas flow measuring device so as to monitor the running state of the gas heat exchanger in real time, the device is convenient to install and high in use universality, and after the device is put into practical application, the real-time monitoring of the running state of the gas heat exchanger is realized. Abnormity of the gas heat exchanger can be found in time so as to be quickly handled, gas abnormal consumption caused by abnormality is saved, and potential safety hazards are eradicated.

Description

Technical Field

[0001] The utility model relates to the technical field related to safe operation detection of metal material heat treatment equipment, and more specifically, to a device for real-time monitoring of the state of a gas heat exchanger and a novel steel rolling heating furnace system. Background Art

[0002] The gas consumption of steel rolling heating furnace accounts for 60%-70% of the total energy consumption of the steel rolling process. Therefore, reducing the gas consumption of heating furnace is the focus of energy conservation and environmental protection in the steel rolling process of enterprises. As the key equipment for preheating gas, the operation status of gas heat exchanger involves regional safety and environmental protection issues.

[0003] Since the gas heat exchanger is in a high-temperature area and is installed underground, it is impossible to check whether the equipment is in normal operation at any time. The current practice for the maintenance of gas heat exchangers is to conduct regular inspections, that is, to inspect the gas heat exchanger during the annual shutdown and maintenance period. As a result, there is a serious lag in obtaining the status of the gas heat exchanger. Once the gas heat exchanger is operating abnormally or the equipment is damaged, not only will a large amount of gas be wasted, but the concentration of CO in the flue gas will also be greater than 12.5%, posing a safety hazard of flue explosion, causing immeasurable property losses and environmental pollution. Utility Model Content

[0004] 1. Technical issues:

[0005] In summary, how to obtain the real-time operating status of the gas heat exchanger to ensure the safe operation of the gas heat exchanger has become an urgent problem to be solved by those skilled in the art.

[0006] (II) Technical solution:

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The utility model provides a device for real-time monitoring of the state of a gas heat exchanger. In the utility model, the device for real-time monitoring of the state of a gas heat exchanger comprises:

[0009] A carbon monoxide concentration monitoring device (1) for being installed on a flue of a heating furnace, wherein the carbon monoxide concentration monitoring device is used to monitor the carbon monoxide concentration in the flue of the heating furnace;

[0010] A gas flow measurement device (2) for measuring the gas flow, wherein two gas flow measurement devices are provided, and are respectively provided on the gas inlet pipe and the gas outlet pipe of the gas heat exchanger, and are used to measure the gas inlet volume and the gas outlet volume of the gas heat exchanger;

[0011] A monitoring device (3), which is signal-connected to the carbon monoxide concentration monitoring device and the gas flow measurement device, and is used to display carbon monoxide monitoring data and gas volume measurement data.

[0012] Preferably, the device for real-time monitoring of the status of a gas heat exchanger provided by the utility model further includes an alarm, and the monitoring device is control-connected to the alarm and is used to send an alarm signal through the alarm when the operating status of the gas heat exchanger is abnormal.

[0013] Preferably, the device for real-time monitoring of the status of the gas heat exchanger provided by the utility model also includes a detection tube, which passes through the flue of the heating furnace and is arranged horizontally, the tail end of the detection tube is located outside the flue of the heating furnace, and the front end of the detection tube is located inside the flue of the heating furnace.

[0014] Preferably, in the device for real-time monitoring of the status of the gas heat exchanger provided by the utility model, a detection cover is arranged at the front end of the detection tube, the detection cover has a detection channel, the axis of the detection channel coincides with the axis of the flue of the heating furnace; the carbon monoxide concentration monitoring device is arranged in the detection cover and in the flue of the heating furnace through the detection tube.

[0015] Preferably, in the device for real-time monitoring of the status of a gas heat exchanger provided by the utility model, the carbon monoxide concentration monitoring device is wiredly connected to the monitoring equipment via a signal line, and the signal line is arranged through the detection tube.

[0016] Preferably, in the device for real-time monitoring of the status of the gas heat exchanger provided by the utility model, the detection cover is a funnel-shaped structure, and the detection cover has a large mouth end and a small mouth end. Along the flue gas flow direction in the heating furnace flue, the small mouth end is arranged forward and the large mouth end is arranged backward.

[0017] Preferably, in the device for real-time monitoring of the status of a gas heat exchanger provided by the utility model, the detection tube includes a plurality of detection tube units, and the head and tail ends of the detection tube units are detachably connected to adjust the setting length of the detection tube.

[0018] The utility model also provides a novel steel rolling heating furnace system, including a heating furnace and a gas heat exchanger, wherein the heating furnace is provided with a flue, and the gas heat exchanger is provided with an air inlet pipe and an air outlet pipe. The novel steel rolling heating furnace system is also provided with a device for real-time monitoring of the status of the gas heat exchanger as described above.

[0019] Preferably, in the new steel rolling heating furnace system provided by the utility model, the device for real-time monitoring of the status of the gas heat exchanger includes a carbon monoxide concentration monitoring device and a gas flow measuring device, the carbon monoxide concentration monitoring device is arranged in the exhaust port of the flue, and the gas flow measuring device is arranged at the pipe ends of the air inlet pipe and the air outlet pipe close to the gas heat exchanger.

[0020] Preferably, in the new steel rolling heating furnace system provided by the utility model, a mounting hole is provided on the flue, and the mounting hole is arranged horizontally and is used for the installation of the detection tube.

[0021] (III) Beneficial effects:

[0022] As can be seen from the above, the utility model provides a device for real-time monitoring of the state of a gas heat exchanger, and the device for real-time monitoring of the state of a gas heat exchanger includes: a carbon monoxide concentration monitoring device for being set on the flue of a heating furnace, the carbon monoxide concentration monitoring device is used to monitor the carbon monoxide concentration in the flue of the heating furnace; a gas flow measurement device for measuring the gas flow, the gas flow measurement device is provided with two, respectively set on the inlet pipe and the outlet pipe of the gas heat exchanger, for measuring the gas inlet volume and the gas outlet volume of the gas heat exchanger; a monitoring device, the monitoring device is connected to the carbon monoxide concentration monitoring device and the gas flow measurement device by signal, and is used to display the carbon monoxide monitoring data and the gas volume measurement data. At the same time, the utility model also provides a new steel rolling heating furnace system, including a heating furnace and a gas heat exchanger, the heating furnace is provided with a flue, the gas heat exchanger is provided with an inlet pipe and an outlet pipe, and the new steel rolling heating furnace system is also provided with the device for real-time monitoring of the state of the gas heat exchanger as described above.

[0023] Through the above-mentioned structural design, the utility model can obtain the required parameters in real time through the carbon monoxide concentration monitoring device and the gas flow measurement device, and use the state parameters of the energy medium such as CO concentration and gas flow to realize real-time monitoring of the operating state of the gas heat exchanger. The utility model is easy to install and has strong versatility. After being put into practical application, the abnormality of the gas heat exchanger can be discovered in time and quickly dealt with, thereby saving the abnormal gas consumption caused by this and eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0025] Figure 1This is a schematic structural diagram of a device for real-time monitoring of the status of a gas heat exchanger in an embodiment of the utility model installed in a new steel rolling heating furnace system;

[0026] Figure 2 This is a schematic structural diagram of a device for real-time monitoring of the status of a gas heat exchanger in an embodiment of the utility model installed on a flue.

[0027] exist Figure 1 and Figure 2 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0028] Carbon monoxide concentration monitoring device 1, gas flow measuring device 2, monitoring equipment 3, heating furnace 4, gas heat exchanger 5, flue 6, air inlet pipe 7, air outlet pipe 8, detection tube 9, detection cover 10, carbon monoxide analyzer 11. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0030] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a schematic structural diagram of a device for real-time monitoring of the status of a gas heat exchanger in an embodiment of the utility model installed in a new steel rolling heating furnace system; Figure 2 This is a schematic structural diagram of a device for real-time monitoring of the status of a gas heat exchanger in an embodiment of the utility model installed on a flue.

[0032] The utility model provides a device for real-time monitoring of the state of a gas heat exchanger, which belongs to energy, environmental protection and safe operation related technologies in steel production, and is specifically a device capable of real-time monitoring of the operating state of a gas heat exchanger 5 .

[0033] In view of the problems existing in the prior art in monitoring the operating status of the gas heat exchanger 5, the utility model provides a device capable of monitoring the status of the gas heat exchanger in real time. The utility model determines the operating status of the gas heat exchanger 5 by the gas flow rate and CO concentration.

[0034] The device for real-time monitoring the state of the coal gas heat exchanger of a steel rolling heating furnace provided by the utility model comprises a carbon monoxide concentration monitoring device 1, a coal gas flow measurement device 2 and an alarm. In the utility model, the state parameters of energy media such as CO concentration and coal gas flow are used to realize real-time acquisition of the operating state of the coal gas heat exchanger 5. The utility model has a reasonable structural design and can accurately obtain the required parameters, providing a guarantee for accurately obtaining the operating state of the coal gas heat exchanger 5. The utility model is easy to use, low cost and high immediacy.

[0035] Specifically, the utility model provides a device for real-time monitoring of the state of a coal gas heat exchanger of a steel rolling heating furnace. In the utility model, the device includes: a carbon monoxide concentration monitoring device 1 for being arranged on a flue 6 of a heating furnace 4, the carbon monoxide concentration monitoring device 1 being used to monitor the carbon monoxide concentration in the flue 6; a coal gas flow measuring device 2 for measuring the coal gas flow, the coal gas flow measuring device 2 being provided with two, which are respectively arranged on an air inlet pipe 7 and an air outlet pipe 8 of a coal gas heat exchanger 5, and are used to measure the coal gas intake and coal gas outlet of the coal gas heat exchanger 5; a monitoring device 3, the monitoring device 3 is signal-connected to the carbon monoxide concentration monitoring device 1 and the coal gas flow measuring device 2, and is used to display carbon monoxide monitoring data and coal gas quantity measurement data; and an alarm, the monitoring device 3 is control-connected to the alarm, and is used to send an alarm signal through the alarm when the operating state of the coal gas heat exchanger 5 is abnormal.

[0036] Based on the device for real-time monitoring the state of the coal gas heat exchanger of the steel rolling heating furnace, the utility model also provides a novel steel rolling heating furnace system, which includes a heating furnace 4 and a coal gas heat exchanger 5. The heating furnace 4 is provided with a flue 6, and the coal gas heat exchanger 5 is provided with an air inlet pipe 7 and an air outlet pipe 8. Specifically, the device for real-time monitoring the state of the coal gas heat exchanger of the steel rolling heating furnace includes a carbon monoxide concentration monitoring device 1 and a coal gas flow measurement device 2. The carbon monoxide concentration monitoring device 1 is arranged in the exhaust port of the flue 6, and the coal gas flow measurement device 2 is arranged at the pipe ends of the air inlet pipe 7 and the air outlet pipe 8 near the coal gas heat exchanger 5.

[0037] The installation and use methods of the utility model are as follows: a carbon monoxide concentration monitoring device 1 is installed at the flue outlet of the heating furnace 4 to monitor the carbon monoxide concentration in the flue 6 of the heating furnace 4 in real time, and two gas flow measuring devices 2 are installed in the front and rear pipes of the gas heat exchanger 5 (the air inlet pipe 7 and the air outlet pipe 8) to measure the gas flow before and after the gas heat exchanger 5 in real time to obtain gas flow data. At the same time, the utility model also provides a monitoring device 3, and the monitoring device 3 has a monitoring screen that can display the data obtained by the carbon monoxide concentration monitoring device 1 and the gas flow measuring device 2. At the same time, the carbon monoxide concentration monitoring device 1 and the gas flow measuring device 2 are also linked to the alarms in the operation room and the dispatching room of the heating furnace 4. Once the carbon monoxide concentration deviates greatly from the normal value range, and the flow difference before and after the gas heat exchanger 5 exceeds the normal range, it can be determined that the gas heat exchanger 5 is damaged, and the alarms in the operation room and the dispatching room of the heating furnace 4 will immediately alarm. The utility model is easy to install and has strong versatility in use. After being put into practical use, the abnormality of the gas heat exchanger 5 can be discovered in time and quickly processed, thereby saving the abnormal gas consumption caused by it and eliminating safety hazards.

[0038] In the present invention, the carbon monoxide data and flow difference data are as follows:

[0039] Judging Criteria normal Low risk High risk CO concentration (ppm) ≤500 500～2000 ＞2000 <![CDATA[Gas flow difference (m 3 / h)]]> ≤300 300～1000 ＞1000

[0040] Based on the above table, both low risk and high risk can trigger alarms, and an alarm can be issued when one of the two parameters reaches the trigger alarm condition. For example, when the carbon monoxide concentration is within the concentration range corresponding to low risk, an alarm can be issued regardless of whether the gas flow difference is normal.

[0041] The utility model provides a device that can monitor the operating status of a gas heat exchanger in real time. Based on the device, the utility model also provides a new steel rolling heating furnace system. The innovative concept of the utility model is: a detection port (i.e., a mounting hole) is set on the flue 6 of the heating furnace 4, and a carbon monoxide concentration monitoring device 1 is set in the flue 6 through the detection port. The carbon monoxide concentration monitoring device 1 obtains the carbon monoxide parameters in the flue gas, and then uploads them to the monitoring device 3 (the monitoring device 3 includes a carbon monoxide analyzer 11). Through a flue gas detection and analysis mode similar to CEMS, the instantaneous flue gas flow rate and CO concentration are calculated, and then the data is exported to the computer display screen in the operating room using optical fiber, so that the flue gas related component indicators can be observed in real time, and the operating status of the gas heat exchanger can be judged according to the flue gas related component indicators.

[0042] The monitoring equipment 3 specifically includes two sets of equipment, one set is a carbon monoxide analyzer 11, which is connected to the carbon monoxide concentration monitoring device 1 and is used to analyze the carbon monoxide content in the flue gas in the flue, and the other set is a flow analyzer, which is connected to the gas flow measuring device 2 and is used to analyze the gas flow at the inlet and outlet of the gas heat exchanger.

[0043] Specifically, the working principle of the carbon monoxide gas analyzer is to use the technology that the measured gas can selectively absorb infrared light to realize the process monitoring of the gas. Among them, the technical principle of the non-spectral instrument is that the continuous spectrum emitted by the non-spectral (NDIR) light source is projected onto the sample to be measured, and the component to be measured absorbs the infrared light of its characteristic absorption band, thereby realizing the detection of gas concentration. Its advantages are high sensitivity and good stability. The infrared light emitted by the infrared light source has a specific wavelength and can selectively absorb a certain concentration of the gas to be measured. The gas concentration after absorption will change with the intensity of the light. This change law obeys the Beer-Lambert absorption law, thereby determining the concentration of the measured gas.

[0044] The utility model mainly needs to obtain two parameters, one is the carbon monoxide concentration in the flue gas, and the other is the gas flow rate at the inlet and outlet of the gas heat exchanger. For the acquisition of the gas flow rate parameters, the utility model sets a gas flow rate measuring device 2, which can be directly installed on the inlet and outlet of the gas heat exchanger. For the acquisition of the carbon monoxide concentration parameter, the utility model sets a carbon monoxide concentration monitoring device, which needs to be set in the flue. In one case, the flue is a vertically arranged gas (smoke) channel. In order to install the carbon monoxide concentration monitoring device inside the flue, the utility model sets an installation hole on the flue (it can also be called a detection port, which is a small hole channel running through the flue for installing the detection tube 9). The utility model sets the detection tube 9 through the installation hole. The detection tube 9 passes through the flue of the heating furnace and is arranged horizontally. The tail end of the detection tube 9 is located outside the flue of the heating furnace, and the front end of the detection tube 9 is located inside the flue of the heating furnace. The carbon monoxide concentration monitoring device is arranged at the front end of the detection tube 9.

[0045] Furthermore, the utility model is provided with a detection cover 10 at the front end of the detection tube 9, and the detection cover 10 has a detection channel (the detection cover 10 is a cover similar to a funnel shape, which is used to gather smoke inside the flue and increase the amount of smoke passing through the detection channel), and the axis of the detection channel coincides with the axis of the flue of the heating furnace, that is, the detection cover 10 is located at the center of the flue, and the carbon monoxide concentration monitoring device is arranged in the detection cover 10 and is arranged in the flue of the heating furnace through the detection tube 9. In the utility model, the carbon monoxide concentration monitoring device is connected to the monitoring equipment by a signal line (optical fiber), and the signal line passes through the detection tube 9 (the detection tube 9 is hollow and is used to set the optical fiber). Further, the detection cover 10 is a funnel-shaped structure, and the detection cover 10 has a large mouth end and a small mouth end. Along the direction of smoke flow in the flue of the heating furnace, the small mouth end is arranged forward and the large mouth end is arranged backward, so that the smoke flow inside the detection cover 10 can be increased, and the monitoring accuracy of the carbon monoxide concentration monitoring device on the carbon monoxide concentration can be improved. The detection tube 9 and the detection cover 10 are both made of high temperature resistant materials, such as stainless steel.

[0046] In order to meet the adjustment of the position of the carbon monoxide concentration monitoring device inside the flue and meet the installation requirements of flues of different diameters, the utility model needs to design a length-adjustable structure for the detection tube 9. Specifically, the detection tube 9 includes a plurality of detection tube 9 units, and the head and tail ends of the detection tube 9 units are detachably connected (one end of the detection tube 9 unit is provided with an external thread, and the other end is provided with an internal thread, and the detection tube 9 units are connected by a threaded connection method), which is used to adjust the setting length of the detection tube 9.

[0047] As can be seen from the above, the utility model provides a device for real-time monitoring of the state of a gas heat exchanger, and the device for real-time monitoring of the state of a gas heat exchanger includes: a carbon monoxide concentration monitoring device 1 for being arranged on the flue 6 of a heating furnace 4, the carbon monoxide concentration monitoring device 1 is used to monitor the carbon monoxide concentration in the flue 6 of the heating furnace 4; a gas flow measuring device 2 for measuring the gas flow, the gas flow measuring device 2 is provided with two, which are respectively arranged on the air inlet pipe 7 and the air outlet pipe 8 of the gas heat exchanger 5, and are used to measure the gas intake and gas outlet of the gas heat exchanger 5; a monitoring device 3, the monitoring device 3 is signal-connected to the carbon monoxide concentration monitoring device 1 and the gas flow measuring device 2, and is used to display the carbon monoxide monitoring data and the gas volume measurement data. At the same time, the utility model also provides a new steel rolling heating furnace system, including a heating furnace 4 and a gas heat exchanger 5. The heating furnace 4 is provided with a flue 6, and the gas heat exchanger 5 is provided with an air inlet pipe 7 and an air outlet pipe 8. The new steel rolling heating furnace system is also provided with a device for real-time monitoring of the status of the gas heat exchanger as mentioned above.

[0048] Through the above-mentioned structural design, the utility model can obtain the required parameters in real time through the carbon monoxide concentration monitoring device 1 and the gas flow measurement device 2, and use the state parameters of the energy medium such as CO concentration and gas flow to realize real-time monitoring of the operating state of the gas heat exchanger 5. The utility model device is easy to install and has strong versatility. After being put into practical application, it can timely discover the abnormality of the gas heat exchanger 5 and quickly deal with it, saving the abnormal gas consumption caused by it and eliminating safety hazards.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for real-time monitoring of the status of a gas heat exchanger, characterized in that: include: A carbon monoxide concentration monitoring device (1) for being installed on a flue of a heating furnace, wherein the carbon monoxide concentration monitoring device is used to monitor the carbon monoxide concentration in the flue of the heating furnace; A gas flow measurement device (2) for measuring the gas flow, wherein two gas flow measurement devices are provided, and are respectively provided on the gas inlet pipe and the gas outlet pipe of the gas heat exchanger, and are used to measure the gas inlet volume and the gas outlet volume of the gas heat exchanger; A monitoring device (3), which is signal-connected to the carbon monoxide concentration monitoring device and the gas flow measurement device, and is used to display carbon monoxide monitoring data and gas volume measurement data.

2. The device for real-time monitoring of the status of a gas heat exchanger according to claim 1, characterized in that: An alarm is also included. The monitoring device is control-connected to the alarm and is used to send an alarm signal through the alarm when the gas heat exchanger is in an abnormal operating state.

3. The device for real-time monitoring of the status of a gas heat exchanger according to claim 1, characterized in that: It also includes a detection tube (9), which passes through the flue of the heating furnace and is arranged horizontally, the tail end of the detection tube is located outside the flue of the heating furnace, and the front end of the detection tube is located inside the flue of the heating furnace.

4. The device for real-time monitoring of the state of a gas heat exchanger according to claim 3, characterized in that: A detection cover (10) is arranged at the front end of the detection tube, the detection cover has a detection channel, and the axis of the detection channel coincides with the axis of the heating furnace flue; The carbon monoxide concentration monitoring device is arranged in the detection cover and is arranged in the flue of the heating furnace through the detection tube.

5. The device for real-time monitoring of the state of a gas heat exchanger according to claim 4, characterized in that: The carbon monoxide concentration monitoring device is wiredly connected to the monitoring equipment via a signal line, and the signal line is arranged through the detection tube.

6. The device for real-time monitoring of the state of a gas heat exchanger according to claim 4, characterized in that: The detection cover is a funnel-shaped structure, and has a large-mouth end and a small-mouth end. Along the flue gas flow direction in the flue of the heating furnace, the small-mouth end is arranged forward and the large-mouth end is arranged backward.

7. The device for real-time monitoring of the state of a gas heat exchanger according to claim 4, characterized in that: The detection tube includes a plurality of detection tube units, and the head and tail ends of the detection tube units are detachably connected to adjust the setting length of the detection tube.

8. A novel steel rolling heating furnace system, comprising a heating furnace (4) and a gas heat exchanger (5), wherein the heating furnace is provided with a flue (6), and the gas heat exchanger is provided with an air inlet pipe (7) and an air outlet pipe (8), characterized in that: The novel steel rolling heating furnace system is also provided with a device for real-time monitoring of the status of the gas heat exchanger as described in any one of claims 1 to 7.

9. The new steel rolling heating furnace system according to claim 8 is characterized in that: The device for real-time monitoring of the status of the gas heat exchanger includes a carbon monoxide concentration monitoring device and a gas flow measurement device. The carbon monoxide concentration monitoring device is arranged in the exhaust port of the flue, and the gas flow measurement device is arranged at the pipe ends of the air inlet pipe and the air outlet pipe close to the gas heat exchanger.

10. The new steel rolling heating furnace system according to claim 8, characterized in that: A mounting hole is arranged on the flue, and the mounting hole is arranged horizontally and is used for installing the detection tube.

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