Self-adaptive intelligent heat pipe heat exchange flue gas waste heat recovery method and device

Abstract

The invention discloses a self-adaptive intelligent heat pipe heat exchange flue gas waste heat recovery method and device, belongs to the technical field of thermal power generation and industrial waste heat recovery, and aims to solve the problems that an existing heat pipe type low-temperature economizer is fixed in heat exchange capacity, cannot respond to exhaust gas temperature fluctuation and is difficult to give consideration to waste heat efficient recovery and equipment corrosion prevention. According to the device, a heat pipe heat exchanger module, a vacuum degree adjusting module, a temperature monitoring module and an intelligent control module are integrated, and from a heat pipe heat transfer source, the vacuum degree of a heat pipe is dynamically adjusted to change the heat exchange efficiency; according to the corresponding method, through closed-loop control logic, the change of the exhaust gas temperature is responded in real time, and the outlet exhaust gas temperature is accurately stabilized in a preset optimal interval. The system is fast in adjustment response and fine in control, has a self-maintenance function, can be widely applied to a coal-fired boiler tail flue gas waste heat recovery system, and achieves the dual purposes of energy conservation and equipment safety.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation and industrial waste heat recovery technology, specifically to an adaptive intelligent heat pipe heat exchanger waste heat recovery method and device for flue gas at the tail end of a coal-fired boiler, which is particularly suitable for low-temperature economizer systems that achieve precise control of exhaust gas temperature by dynamically adjusting the vacuum degree of the heat pipe. Background Technology

[0002] In thermal power generation and industrial boiler operation, low-temperature economizers are typically installed in the flue gas duct between the air preheater outlet and the electrostatic precipitator to recover waste heat from flue gas and reduce coal consumption. Flue gas temperature fluctuates significantly due to various factors such as boiler load and ambient temperature: excessively high flue gas temperatures result in substantial sensible heat waste and reduced energy efficiency; excessively low flue gas temperatures can lead to condensation of sulfuric acid vapor in the flue gas, causing low-temperature acid dew corrosion of downstream equipment such as the electrostatic precipitator and fans, thus affecting equipment lifespan. Therefore, an ideal low-temperature economizer needs to have active adjustment capabilities, enhancing heat exchange when the flue gas temperature is high and reducing heat exchange when the flue gas temperature is low, stabilizing the outlet flue gas temperature within a safe and economical set range.

[0003] Heat pipe heat exchangers, as highly efficient phase-change heat exchange devices, are widely used in low-temperature economizers. The heat transfer capacity of a single heat pipe is directly related to the saturation temperature of the internal working fluid (usually water), which is determined by the vacuum level inside the heat pipe: the higher the vacuum level, the lower the boiling point of the working fluid, the faster the evaporation and condensation rates, and the stronger the axial heat transfer capacity; conversely, a lower vacuum level weakens the heat transfer capacity. However, once a traditional heat pipe economizer is manufactured, the vacuum level of the heat pipe is fixed, the heat exchange capacity is not adjustable, it cannot respond to fluctuations in flue gas temperature, and it is difficult to balance the needs of waste heat recovery and equipment corrosion prevention.

[0004] While existing technologies include methods to control the heat exchange capacity of economizers by bypassing flues or adjusting water flow, these methods suffer from drawbacks such as slow response speed, limited adjustment precision, and complex equipment structure. Currently, there is a lack of a system and method that, based on the core heat transfer mechanism of heat pipes, achieves stepless and rapid adaptive adjustment of heat exchange capacity through online and precise adjustment of the heat pipe's own operating state (vacuum degree), thus failing to meet the practical needs for precise control of exhaust gas temperature. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing heat pipe type low-temperature economizers, which have fixed heat exchange capacity and cannot adapt to fluctuations in inlet flue gas temperature. It provides an adaptive intelligent heat pipe heat exchange flue gas waste heat recovery method and device, which monitors the exhaust gas temperature in real time, dynamically adjusts the vacuum degree of the heat pipe bundle through closed-loop control, changes the overall heat exchange efficiency, and automatically and accurately maintains the exhaust gas temperature within the preset optimal range, thus achieving the dual effects of efficient waste heat recovery and prevention of low-temperature corrosion.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: I. Adaptive Intelligent Heat Pipe Heat Exchanger Flue Gas Waste Heat Recovery Device The device consists of four core components: a heat pipe heat exchanger module, a vacuum regulation module, a temperature monitoring module, and an intelligent control module. These modules work together to achieve adaptive regulation. The specific structure is as follows: 1. Heat pipe heat exchanger module As the core carrier for heat transfer, it undertakes the function of absorbing and transferring waste heat from flue gas, and includes a water tank and multiple heat pipes: - Water tank: It consists of a cylindrical body, an upper cover and a lower bottom, forming a closed water-side flow space to contain the heat exchange medium (boiler feedwater or condensate) and provide a heat exchange environment for the heat pipe condensing section; - Heat pipes: Made of carbon steel, the tubes vertically penetrate the upper cover and lower bottom of the water tank, with sealed welding at the penetration point to ensure no leakage; the heat pipes have clearly defined functional zones: the part inside the water tank is the condensation section (heat release end), which releases heat in contact with the heat exchange medium; the part outside the water tank, below the bottom of the lower cylinder, is the evaporation section (heat absorption end), which is inserted into the flue and directly contacts the high-temperature flue gas to absorb waste heat; each heat pipe is encapsulated with an evaporation medium mainly composed of water, and a certain initial vacuum is pre-set to ensure initial heat exchange capacity.

[0007] 2. Vacuum degree adjustment module Providing an adjustable vacuum environment for the heat pipe bundle is the core structure for achieving heat exchange capacity regulation. It includes the evacuation branch, evacuation main pipe, high vacuum pump, main pipe isolation valve, and main vacuum gauge. - Adjustment group division: The multiple heat pipes are divided into several adjustment groups (each group consists of multiple parallel heat pipes), and each group corresponds to an independent exhaust branch, so as to achieve fine adjustment by group and avoid energy waste caused by overall adjustment; - Evacuation Branch: Each branch is equipped with a vacuum pressure sensor and a vacuum regulating valve (preferably a solenoid valve or a pneumatic regulating valve). The vacuum pressure sensor monitors the vacuum level of the corresponding heat pipe group in real time and feeds it back to the intelligent control module; the vacuum regulating valve controls the on / off of the branch to achieve precise control of the evacuation. - Pumping main pipe and vacuum pump: All pumping branches are connected to a common pumping main pipe, which is connected in sequence to the main pipe isolation valve, high-precision main vacuum gauge and high vacuum pump (preferably rotary vane vacuum pump); the main pipe isolation valve is used to isolate the vacuum pump from the pumping branches, the main vacuum gauge monitors the overall vacuum level of the main pipe, and the high vacuum pump provides power for pumping, which can quickly improve the vacuum level of the heat pipe assembly.

[0008] 3. Temperature monitoring module Used to sense the system's operating status in real time and provide data support for control decisions, including flue gas temperature sensors and water temperature sensors: - Flue gas temperature sensors: installed in the inlet and outlet flue of the heat exchanger respectively, to collect the inlet flue gas temperature T_in and outlet flue gas temperature T_out in real time, directly reflecting the flue gas temperature fluctuation; - Water temperature sensors: Installed on the inlet and outlet water pipes of the heat exchanger respectively, to collect inlet and outlet water temperature data, assist in judging the heat exchange efficiency of the heat pipe, and ensure that the system operation status is traceable.

[0009] 4. Intelligent Control Module As the core decision-making unit of the system, it adopts a PLC or DCS controller and is electrically connected to all temperature sensors, vacuum pressure sensors, vacuum regulating valves, and high vacuum pumps to realize signal acquisition, logic analysis, and command output. - Preset parameters: The target control range of flue gas temperature [T_low, T_high] is preset in the controller. This range is determined according to the boiler operating characteristics, fuel composition and equipment corrosion protection requirements (e.g., 85℃-95℃). - Control function: Receives real-time data from various sensors, analyzes and judges it through built-in control logic, and sends start / stop and adjustment commands to the vacuum regulating valve and high vacuum pump to achieve closed-loop control.

[0010] II. Adaptive Intelligent Heat Pipe Heat Exchange Flue Gas Waste Heat Recovery Method Based on the above device, this method dynamically adjusts the vacuum level of the heat pipe assembly through closed-loop control logic to achieve precise control of the exhaust gas temperature. The specific steps are as follows: S1: System startup initialization After the system starts up, it completes equipment self-test and parameter initialization, and sets the target control range of flue gas temperature [T_low, T_high] (e.g., T_low=85℃, T_high=95℃). At this time, all vacuum regulating valves are closed, the high vacuum pump is on standby, and the heat pipe heat exchanger module performs heat exchange according to the initial vacuum level.

[0011] S2: Real-time data acquisition The intelligent control module continuously collects data from various sensors, including inlet flue gas temperature T_in, outlet flue gas temperature T_out, inlet water temperature, outlet water temperature, and vacuum data of each heat pipe group, to ensure a comprehensive understanding of the system's operating status.

[0012] S3: Control Decision The intelligent control module compares the inlet flue gas temperature T_in with the preset target control range [T_low, T_high] and makes the following decision: - If T_in>T_high: It is determined that the flue gas temperature is too high, and the heat exchange efficiency needs to be enhanced to recover waste heat, and the "exhaust efficiency improvement" mode is entered. - If T_in < T_low: It is determined that the exhaust gas temperature is too low, there is a risk of equipment corrosion. It is necessary to weaken the heat exchange or maintain the current vacuum degree, and enter the "maintain or weaken heat exchange" mode (the air extraction operation can be paused, or the vacuum degree can be slightly reduced through controllable leakage to avoid excessive heat exchange); - If T_low ≤ T_in ≤ T_high: It is determined that the exhaust gas temperature is in the optimal range, maintain the current operating state without adjustment.

[0013] S4: Execution process of the "air extraction efficiency improvement" mode When entering the "air extraction efficiency improvement" mode, adjust the vacuum degree and enhance the heat exchange according to the following steps: - S4.1: The intelligent control module issues an instruction to start the high vacuum pump and open the main pipe isolation valve to establish an air extraction path; - S4.2: According to the magnitude of the flue gas temperature deviation (T_in - T_high), open the vacuum regulating valves one by one or in groups according to a predetermined strategy (such as sequential opening, grouped opening) to extract air from the corresponding heat pipe groups; the greater the flue gas temperature deviation, the more vacuum regulating valves are opened simultaneously, and the greater the air extraction intensity, rapidly enhancing the heat exchange capacity; - S4.3: The vacuum pressure sensors of each heat pipe group continuously feedback the vacuum degree data. When the vacuum degree of a certain heat pipe group reaches the preset higher target value, the intelligent control module issues an instruction to close the vacuum regulating valve of this group to avoid excessive air extraction; - S4.4: Continuously monitor the inlet flue gas temperature T_in during the air extraction process. If T_in starts to decline and enters the target control range, stop opening new vacuum regulating valves; if T_in is stable within the target range, gradually close the opened vacuum regulating valves, stop the high vacuum pump, and restore the stable operating state; - During this process, the air extraction operation can synchronously discharge the non-condensable hydrogen gas accumulated due to electrochemical corrosion in the heat pipes, realizing self-maintenance of the heat pipe performance and extending the service life of the equipment.

[0014] S5: Cyclic adaptive adjustment Continuously and cyclically execute steps S2 - S4, respond to the fluctuations of the exhaust gas temperature in real time, and dynamically adjust the vacuum degree of the heat pipe groups to ensure that the exhaust gas temperature is always stable within the preset optimal range, achieving a dynamic balance between efficient waste heat recovery and equipment safety protection.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: Precise and stable control of the exhaust gas temperature: Starting from the heat transfer origin of the heat pipe (vacuum degree / working medium saturation temperature) for adjustment, the principle is direct. The exhaust gas temperature is automatically locked within the preset optimal range, completely solving the contradiction between "preventing waste" and "preventing corrosion" of the economizer with fixed heat exchange capacity, and taking into account both the waste heat recovery efficiency and equipment safety; The adjustment response is fast and precise: It adopts a grouped vacuum degree adjustment mode, which can flexibly control the adjustment range and intensity according to the size of the flue gas temperature deviation, avoiding energy waste caused by overall "over-adjustment". The adjustment response speed is better than the traditional bypass flue or water flow adjustment method, and can quickly suppress flue gas temperature fluctuations. It also has a self-maintenance function: during the gas extraction and adjustment process, it can simultaneously discharge the non-condensable hydrogen gas accumulated in the heat pipe, effectively avoid the "gas lock" phenomenon, maintain the heat transfer performance of the heat pipe, extend the service life of the equipment, and reduce maintenance costs. High degree of automation: It integrates monitoring, analysis, control and execution, requiring no human intervention throughout the process, realizing intelligent unattended operation and reducing maintenance intensity; High structural integration and easy implementation: Each module has a reasonable structural design and can be retrofitted on the basis of the existing heat pipe economizer. The retrofit work is small and the cost is controllable, which can meet the upgrade needs of the existing coal-fired boiler tail flue gas waste heat recovery system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram illustrating the overall structure and control principle of the device of the present invention. In the above figures, 1-heat pipe, 1a-evaporation section (heat absorption end), 1b-condensation section (heat release end), 2-water tank, 3-inlet flue and flue gas temperature sensor, 4-outlet flue and flue gas temperature sensor, 5-inlet water pipe and water temperature sensor, 6-outlet water pipe and water temperature sensor, 7-vacuum pressure sensor, 8-vacuum regulating valve, 10-high vacuum pump, 11-intelligent controller, 13-main vacuum gauge, 14-flue. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example: Application of Adaptive Intelligent Heat Pipe Heat Exchanger Flue Gas Waste Heat Recovery Device and Method 1. Specifications and design of core components of the device - Heat pipe heat exchanger module: Water tank 2 is a rectangular structure, welded from Q345R steel plate, with an inner diameter of 1500mm × 1500mm and a height of 2000mm; it contains 256 carbon steel-water heat pipes 1, with an outer diameter of 89mm, a wall thickness of 5mm, and a single pipe length of 3500mm, of which the condensing section 1b is 1200mm long (located inside the water tank), and the evaporating section 1a is 2300mm long (inserted into flue 14); the heat pipes are encapsulated with deionized water as the evaporation medium, and the initial vacuum degree is set to 5Pa; the 256 heat pipes are evenly divided into 4 regulating groups (64 pipes in parallel in each group), and each group corresponds to one exhaust branch; - Vacuum regulation module: Each pumping branch is equipped with an electrochemical vacuum pressure sensor 7 (measuring range 1-1000Pa, accuracy ±1Pa) and a DN15 solenoid vacuum regulating valve 8; the main pumping pipe 9 is made of stainless steel with a diameter of 50mm; the high vacuum pump 10 is a rotary vane vacuum pump (pumping speed 2L / s, ultimate vacuum 1Pa); the main pipe isolation valve 12 is an electric ball valve, and the main vacuum gauge 13 is a high-precision capacitive vacuum gauge (measuring range 0.1-1000Pa). - Temperature monitoring module: PT100 platinum resistance flue gas temperature sensors (measurement range 0-300℃, accuracy ±1℃) are installed in inlet flue 3 and outlet flue 4; PT100 platinum resistance water temperature sensors (measurement range 0-100℃, accuracy ±0.5℃) are installed in inlet water pipe 5 and outlet water pipe 6. - Intelligent Control Module 11: Selects an S7-1500 series PLC controller, with a preset target control range for exhaust temperature [T_low=85℃, T_high=95℃], and features data acquisition, logic operation, instruction output, and data visualization functions.

[0021] 2. Equipment Assembly and Installation - Component assembly: First, complete the sealing welding between water tank 2 and heat pipe 1. After water pressure test (test pressure 1.6MPa, pressure held for 30 minutes without leakage), weld the exhaust branch to the top of each heat pipe group, and install vacuum pressure sensor 7 and vacuum regulating valve 8; combine all exhaust branches to exhaust main pipe 9, and connect main pipe isolation valve 12, main vacuum gauge 13 and high vacuum pump 10 in sequence; - System wiring: Connect the signal lines of all temperature sensors and vacuum pressure sensors 7 to the analog input module of PLC controller 11, and connect the control lines of vacuum regulating valve 8, high vacuum pump 10, and main pipe isolation valve 12 to the digital output module of the controller to complete the control loop connection. Power on and debug to ensure normal signal transmission and reliable equipment operation. - On-site installation: Install the entire device in the flue 14 between the boiler air preheater outlet and the electrostatic precipitator, ensuring that the heat pipe evaporation section 1a is completely submerged in the flue gas passage; connect the water tank 2 to the boiler feedwater circulation pipeline, connect the inlet water pipe 5 to the boiler feedwater main pipe, and connect the outlet water pipe 6 to the boiler economizer inlet to complete the overall installation.

[0022] 3. Method Flow and Results - Initialization phase: After the system starts up, set the target exhaust temperature range [85℃, 95℃], close all vacuum regulating valves 8, put the high vacuum pump 10 on standby, and the heat pipes perform heat exchange according to the initial vacuum level; - Normal operation adjustment: When the unit load increases, the inlet flue gas temperature T_in rises to 100℃ (exceeding T_high=95℃). The PLC controller 11 determines that heat exchange needs to be enhanced, starts the high vacuum pump 10, opens the main pipe isolation valve 12, and opens the first group of vacuum regulating valves 8 in sequence to evacuate the heat pipes in this group. When the vacuum pressure sensor 7 reports that the vacuum level drops from 5Pa to 2Pa, the first group of regulating valves is closed. At this time, T_in drops to 98℃. The second group of regulating valves is opened to evacuate until the vacuum level reaches 2Pa and T_in drops to 94℃ (entering the target range). The opening of new valves is stopped. After maintaining this for 10 minutes, the two groups of regulating valves are gradually closed, and the high vacuum pump 10 is shut down. - Low flue gas temperature protection: When the unit load decreases, T_in drops to 80℃ (below T_low=85℃). The controller determines that heat exchange needs to be weakened, stops the gas extraction operation, maintains the current vacuum level, and T_in gradually rises back to 86℃, restoring stable operation. - Self-maintenance effect: During operation, the gas extraction operation simultaneously discharges the hydrogen gas accumulated in the heat pipe. After 12 months of continuous operation, the heat exchange efficiency of the heat pipe has not decreased significantly. Compared with the traditional heat pipe economizer, it reduces the number of downtime maintenance by 2, saves about 75 tons of standard coal per year, and the flue gas temperature is stably controlled between 85℃ and 95℃. No low-temperature corrosion of the equipment has been observed.

[0023] This invention breaks through the technical bottleneck of fixed heat exchange capacity in traditional heat pipe economizers by innovatively designing a vacuum degree dynamic adjustment system and closed-loop control method. It achieves precise adaptive control of flue gas temperature, and combines high efficiency in waste heat recovery, safe operation and convenient maintenance. It can be widely used in the tail flue gas waste heat recovery system of various coal-fired boilers and industrial boilers, and has extremely high practical value and promotion prospects.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A self-adaptive intelligent heat pipe heat exchange flue gas waste heat recovery device, characterized in that, The heat pipe heat exchanger module, the vacuum degree adjusting module, the temperature monitoring module and the intelligent control module are comprised. The heat pipe heat exchanger module comprises a water tank and a plurality of heat pipes, the water tank is composed of a cylinder, an upper cylinder cover and a lower cylinder bottom to form a closed space, the heat pipes vertically penetrate the upper cylinder cover and the lower cylinder bottom, the outer wall is sealed and welded with the cylinder cover and the cylinder bottom at the perforated part, the part of the heat pipe inside the water tank is the condensing section (heat releasing end), the part of the heat pipe outside the water tank and inserted into the flue is the evaporation section (heat absorbing end), the heat pipe is encapsulated with water-based evaporation medium and is preset with initial vacuum degree. The vacuum degree adjusting module comprises an air extraction branch, an air extraction main pipe, a high vacuum pump, a main pipe isolation valve and a main vacuum gauge, the plurality of heat pipes are divided into a plurality of adjusting groups, the top of the condensing section of each group of heat pipes is connected with an air extraction branch, the air extraction branch is provided with a vacuum pressure sensor and a vacuum adjusting valve, all the air extraction branches are merged into the air extraction main pipe, the air extraction main pipe is sequentially connected with the main pipe isolation valve, the main vacuum gauge and the high vacuum pump. The temperature monitoring module comprises flue gas temperature sensors and water temperature sensors, the inlet flue and the outlet flue are respectively provided with flue gas temperature sensors, the inlet water pipe and the outlet water pipe of the heat exchanger are respectively provided with water temperature sensors. The intelligent control module is a PLC or DCS controller, which is electrically connected with all the temperature sensors, the vacuum pressure sensors, the vacuum adjusting valves and the high vacuum pump, and the controller is preset with a flue gas temperature target control range [T_low, T_high].

2. The self-adapting intelligent heat-pipe heat-exchange flue gas waste heat recovery device according to claim 1, characterized in that, The vacuum adjusting valve is an electromagnetic valve or a pneumatic adjusting valve, the high vacuum pump is a rotary vane vacuum pump, and the main vacuum gauge is a high-precision vacuum gauge.

3. The self-adapting intelligent heat-pipe heat-exchange flue gas waste heat recovery device according to claim 1, characterized in that, The adjusting group is a plurality of parallel heat pipes, each group corresponds to an independent air extraction branch, and the grouped vacuum degree adjustment is realized.

4. An adaptive intelligent heat pipe heat exchanger flue gas waste heat recovery method based on the device of any one of claims 1-3, characterized in that, The following closed-loop control steps are comprised: S1: system startup initialization, set the flue gas temperature target control range [T_low, T_high], all the vacuum adjusting valves are closed, and the high vacuum pump is in standby; S2: the intelligent control module collects the inlet flue gas temperature T_in, the outlet flue gas temperature T_out, the inlet water temperature and the outlet water temperature data in real time, and the vacuum pressure sensor feeds back the vacuum degree data of each adjusting group in real time; S3: control decision, the intelligent control module compares T_in with the target control range: If T_in > T_high, enter the "air extraction efficiency improvement" mode; If T_in < T_low, enter the "heat exchange maintenance or weakening" mode; If T_low ≤ T_in ≤ T_high, maintain the current operating state; S4: the "air extraction efficiency improvement" mode executes the following process: S4.1: start the high vacuum pump and open the main pipe isolation valve; S4.2: according to the flue gas temperature deviation, open the vacuum adjusting valves one by one or in groups according to the predetermined strategy, and extract air for the corresponding heat pipe group; S4.3: when the vacuum degree of a heat pipe group reaches the preset target value, the vacuum adjusting valve of the group is closed; S4.4: continuously monitor T_in, if T_in drops to the target control range, stop opening new vacuum adjusting valves; if T_in is stable in the target range, gradually close the opened vacuum adjusting valves, and the high vacuum pump is stopped; S5: cyclically execute steps S2-S4 to realize self-adaptive adjustment.

5. The self adaptive intelligent heat pipe heat exchanging flue gas waste heat recovery method according to claim 4, characterized in that, The "maintaining or weakening heat exchange" mode includes pausing the pumping operation or reducing the vacuum degree of the heat pipe group through controllable leakage.

6. The self adaptive intelligent heat pipe heat exchanging flue gas waste heat recovery method as claimed in claim 4, wherein, The predetermined strategy in step S4.2 is a sequential opening or grouping opening strategy, and the number of simultaneously opened vacuum regulating valves is determined according to the size of the smoke temperature deviation value.

7. The self adaptive intelligent heat pipe heat exchanging flue gas waste heat recovery method as claimed in claim 4, wherein, The accumulated non-condensable hydrogen in the heat pipe is synchronously discharged during the pumping process.

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