A total oxygen heating furnace system

Abstract

The application discloses a full-oxygen heating furnace system, and relates to the technical field of heating furnace equipment, which comprises a furnace body, a full-oxygen burner arranged in the furnace body, a rotary regenerative flue gas cooling and dehydrating device, an air supporting gas distribution system and the like.

Description

Technical Field

[0001] This invention relates to the field of heating furnace equipment technology, and specifically to an all-oxygen heating furnace system. Background Technology

[0002] Tubular heaters are indispensable core heating equipment in process industries such as oil refining and chemical manufacturing. They are also major energy consumers within the plant, and their thermal efficiency and pollutant emission levels directly affect the plant's operating costs and environmental compliance. Faced with global pressure to achieve "dual carbon" targets, promoting the transformation of heater technology towards high efficiency and low carbon emissions is now imperative.

[0003] Currently, most industrial heating furnaces utilize conventional air-assisted combustion technology. This technology uses air as the combustion medium. Because a large amount of nitrogen in the air, which does not participate in the reaction, is heated during combustion and discharged as waste gas, it carries away a significant amount of sensible heat, resulting in substantial heat loss in the flue gas and limiting further improvements in thermal efficiency. Furthermore, the massive volume of flue gas emissions severely dilutes the concentration of carbon dioxide (CO2) (typically only about 10%-15%), making its capture and separation extremely costly and economically unfeasible. In addition, nitrogen in the air reacts with oxygen at high temperatures to produce large amounts of nitrogen oxides (NOx), creating significant environmental pollution control challenges.

[0004] To partially improve efficiency, oxygen-enriched combustion technology using "air + pure oxygen" has emerged as an improvement. This technology increases the oxygen concentration in the combustion air by mixing pure oxygen into the air, thereby increasing the combustion temperature and accelerating the combustion speed, and improving heat transfer efficiency to some extent. However, this technology does not fundamentally change the combustion basis that uses nitrogen as a diluent and heat carrier. Although the total amount of flue gas is reduced, nitrogen still accounts for a considerable proportion, resulting in significant smoke losses. Moreover, the increase in CO2 concentration in the flue gas is limited, and it cannot be economically used for carbon capture. At the same time, the higher flame temperature may actually exacerbate the formation of thermal NOx. Therefore, existing technologies, whether conventional air-assisted combustion or simple "air + pure oxygen" oxygen-enriched combustion, share a common, unresolved core problem: they cannot significantly reduce or even eliminate the nitrogen content in the flue gas, thus failing to achieve a leap in energy efficiency and a sharp reduction in flue gas emissions at the root cause.

[0005] Against this backdrop, all-oxygen (NOx-free) combustion technology is considered a key path to achieving a disruptive upgrade of heating furnaces. This technology uses pure oxygen and mixes it with recirculated flue gas to form a combustion-supporting medium, which can theoretically reduce flue gas emissions by about two-thirds, thereby greatly reducing exhaust losses. At the same time, since it fundamentally eliminates the participation of nitrogen in combustion, it can not only achieve near-zero NOx emissions, but also produce flue gas with a CO2 concentration of over 90%, which significantly reduces the cost of carbon capture and storage (CCS) and makes it possible for industrial heating furnaces to move towards "carbon neutrality".

[0006] However, this advanced technology faces severe challenges in transitioning from the laboratory to industrial application. Existing industrial heating furnaces, from their design concepts and system integration to their control strategies, are tailored for air-assisted combustion, lacking an integrated industrial solution capable of stably constructing and precisely controlling the unique combustion environment of "recirculated flue gas + pure oxygen".

[0007] Therefore, there is an urgent need in this field for a fully oxygen-fired furnace system that can be directly applied to industrial production, is highly integrated, operates stably, and boasts excellent energy efficiency. This system must not only achieve nitrogen-free, fully oxygen combustion, but also solve a series of engineering challenges, from media preparation and efficient energy recovery to intelligent control, thereby transforming the technological potential of fully oxygen combustion into tangible industrial benefits. Summary of the Invention

[0008] To address the aforementioned problems, this invention proposes an all-oxygen heating furnace system, comprising a furnace body and an all-oxygen burner disposed within the furnace body; And a rotary regenerative flue gas cooling and dehydration device. The flue gas side inlet of the flue gas cooling and dehydration device is connected to the hot flue gas duct of the furnace body, which deeply cools and condenses the high-temperature flue gas sent from the duct to remove some water vapor, and efficiently recovers the sensible heat and latent heat in the flue gas. The system includes a combustion air distribution system, which includes a mixer. An air duct, a cold flue gas circulation duct, and an oxygen supply duct are connected to the input end of the mixer to form combustion gas. The output end of the mixer is connected to the combustion gas side inlet of the flue gas cooling and dehydration device. The combustion gas side outlet of the flue gas cooling and dehydration device is connected to the combustion gas main pipeline. After absorbing heat from the high-temperature flue gas, the combustion gas is sent to the oxygen burner through the combustion gas main pipeline.

[0009] Furthermore, the flue gas cooling and dehydrating device is equipped with a third channel. The flue gas side outlet of the flue gas cooling and dehydrating device is connected to an induced draft fan, which is connected to a branch pipe. The branch pipe is connected to the cold flue gas circulation pipe, the cold flue gas emission pipe, and the third channel of the flue gas cooling and dehydrating device, respectively. The side outlet of the third channel is connected to a cold flue gas whitening bypass. The third channel preheats the cold flue gas that is directly discharged into the atmosphere to achieve whitening and demisting. The cold flue gas emission pipe sends the gas to the subsequent CO2 product line for capture and utilization or direct emission into the atmosphere.

[0010] Furthermore, a fuel gas distribution system is provided, which includes one or more of the following: hydrogen buffer tank, methane buffer tank, propane buffer tank, butane buffer tank, and nitrogen buffer tank. A mixer buffer tank is connected in parallel to the fuel gas distribution system, and the mixer buffer tank is connected to the oxygen burner through the main fuel gas pipeline.

[0011] Furthermore, a fuel gas heater is provided, and a hot flue gas bypass is connected to a branch of the hot flue gas duct. The hot flue gas bypass is connected to the flue gas side inlet of the fuel gas heater, and the flue gas side outlet of the fuel gas heater is connected to the downstream section of the hot flue gas duct. A fuel gas preheating pipe is connected to a branch of the main fuel gas pipeline, and the fuel gas preheating pipe is connected to the fuel gas side inlet of the fuel gas heater. The fuel gas side outlet of the fuel gas heater is connected to the downstream section of the main fuel gas pipeline, so as to divert a portion of the hot flue gas to preheat the fuel gas.

[0012] Furthermore, a branch of the main fuel gas pipeline is connected to a continuous lamp line, which is connected to the oxygen burner.

[0013] Furthermore, the buffer tank of the fuel gas blending system is configured to reduce the pressure of each type of fuel gas to 0.2~0.3 MPa, and deliver it to the mixer buffer tank in proportion according to the target fuel gas calorific value to mix the fuel gas.

[0014] Furthermore, the air duct, cold flue gas circulation duct, and oxygen supply duct are all equipped with electric regulating valves, and the oxygen content formed in the mixer is in the range of 21% to 40%.

[0015] Furthermore, the oxygen supply pipeline is connected to an oxygen station, and a dehydrator is installed on the cold flue gas circulation duct. The air duct and the cold flue gas circulation duct are fed into the mixing system by a blower.

[0016] Furthermore, the furnace body is equipped with a radiation chamber and a convection chamber, and furnace tubes are arranged to absorb the heat of the process medium. Flue gas analysis sampling ports one, two, and three are respectively installed at the top of the convection chamber and at the inlet and outlet of the flue gas cooling and dehydration device to monitor the oxygen content and pollutant emissions in the flue gas in real time. An oxygen concentration analyzer is installed at the inlet of the oxy-fuel burner in the main combustion air duct to monitor the oxygen concentration of the combustion air in real time. Thermocouples and pressure transmitters are also installed inside the furnace body to provide real-time feedback on the furnace temperature and pressure changes in each layer of the furnace.

[0017] Furthermore, an intelligent control system is provided, which includes a basic layer and an upper layer; the basic layer consists of a DCS or PLC, which is responsible for sequential control and safety interlocking; the upper layer includes a multivariable predictive controller and an artificial intelligence optimizer.

[0018] The beneficial effects of this invention are as follows: 1. Unlike traditional heat exchangers that can only recover sensible heat, this equipment utilizes the principle of rotary heat storage to significantly reduce the flue gas temperature below the dew point, condensing water vapor. This process not only recovers a large amount of sensible heat but also captures the latent heat of vaporization that is wasted in traditional processes and directly transfers it to the combustion gas entering the furnace. This deep heat recovery mechanism enables a breakthrough in the thermal efficiency of the heating furnace, significantly reducing fuel consumption.

[0019] 2. The "white smoke" problem of high-humidity flue gas from oxy-fuel combustion is solved by utilizing internal waste heat. The cold flue gas is reheated before emission, eliminating the need for additional steam or electricity, thus achieving low-cost and environmentally friendly emissions. Simultaneously, because oxy-fuel combustion eliminates nitrogen interference and, combined with deep dehydration, the final emitted flue gas has an extremely high CO2 concentration, providing a high-quality gas source for subsequent low-cost carbon capture.

[0020] 3. For complex fuel sources, the fuel gas blending system utilizes multi-component buffer tanks and pressure stabilization control to achieve online reconfiguration of fuel calorific value. Regardless of fluctuations in upstream components, the properties of the fuel entering the furnace remain stable. Combined with the continuous lamp pipeline and fuel gas preheating structure, this ensures a continuous, safe, and efficient combustion process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structural process of the present invention.

[0022] The following are explanations of the reference numerals in the attached drawings: 1. Furnace body; 2. Oxygen burner; 3. Radiant chamber; 4. Convection chamber; 5. Combustion air distribution system; 51. Mixer; 52. Oxygen supply pipeline; 53. Air pipeline; 54. Cold flue gas circulation pipeline; 55. Oxygen station; 56. Dehydrator; 57. Blower; 6. Flue gas cooling and dehydrating device; 7. Fuel gas distribution system; 71. Hydrogen buffer tank; 72. Methane buffer tank; 73. Propane buffer tank; 74. Butane. Buffer tank; 75. Nitrogen buffer tank; 8. Fuel gas heater; 9. Intelligent control system; 91. Flue gas analysis sampling port one; 92. Flue gas analysis sampling port two; 93. Flue gas analysis sampling port three; 10. Exhaust fan; 11. Cold flue gas emission pipeline; 12. Cold flue gas whitening bypass; 13. Mixer buffer tank; 14. Combustion-supporting main pipeline; 15. Hot flue gas flue; 16. Hot flue gas bypass; 17. Fuel gas preheating pipeline; 18. Continuous light pipeline. Detailed Implementation

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0026] An all-oxygen heating furnace system, such as Figure 1 As shown, its main structure includes a furnace body 1. The internal space of the furnace body 1 is divided into a radiation chamber 3 and a convection chamber 4 according to process requirements. Furnace tubes are arranged in the radiation chamber 3 and convection chamber 4 to absorb heat and heat the process medium flowing inside the tubes. An oxygen-fired burner 2 is installed at the bottom or side wall of the radiation chamber 3 of the furnace body 1. To monitor the operating status inside the furnace in real time, thermocouples and pressure transmitters are installed inside the furnace body 1. Thermocouples are used to provide real-time temperature feedback for each temperature zone of the furnace, and pressure transmitters are used to provide real-time pressure feedback for each layer of the furnace, ensuring that the furnace remains within a safe operating range.

[0027] Example 2

[0028] Based on Embodiment 1 above, this embodiment optimizes the heat recovery component, such as... Figure 1 As shown, the core heat recovery component of the system is a rotary regenerative flue gas cooling and dehydrating device 6. The flue gas inlet of this rotary regenerative flue gas cooling and dehydrating device 6 is connected to the hot flue gas duct 15 of the furnace body 1 via a pipe. When high-temperature flue gas passes through, the flue gas cooling and dehydrating device 6 absorbs heat, deeply cooling the flue gas to below the dew point, causing water vapor in the flue gas to condense and precipitate, thereby removing some water vapor and recovering sensible and latent heat.

[0029] The flue gas cooling and dehydrating device 6 is equipped with a third channel structure. An induced draft fan 10 is connected to the flue gas side outlet of the flue gas cooling and dehydrating device 6, and the outlet of the induced draft fan 10 is connected to a branch pipeline. The branch pipeline is divided into three paths: the first path connects to the cold flue gas circulation pipeline 54 for flue gas recirculation; the second path connects to the cold flue gas emission pipeline 11 for sending the flue gas to the subsequent CO2 product line for capture and utilization or direct emission; the third path connects to the inlet of the third channel of the flue gas cooling and dehydrating device 6. The side outlet of the third channel is connected to a cold flue gas de-whitening bypass 12. This portion of the cold flue gas to be emitted absorbs the heat stored in the flue gas cooling and dehydrating device 6 again in the third channel, and after the temperature rises, it is discharged through the cold flue gas de-whitening bypass 12, achieving de-whitening and demisting.

[0030] In addition, flue gas analysis sampling ports 91, 92 and 93 are respectively installed at the top of the convection chamber 4 and at the inlet and outlet of the flue gas cooling and dehydration device 6, for real-time monitoring of flue gas oxygen content and pollutant emissions.

[0031] Example 3

[0032] Based on Embodiment 2 above, this embodiment optimizes the combustion air component, such as... Figure 1 As shown, the system includes a combustion air distribution system 5 and a fuel gas distribution system 7. The combustion air distribution system 5 includes a mixer 51. An air duct 53, a cold flue gas recirculation duct 54, and an oxygen supply duct 52 are all connected to the input end of the mixer 51. The oxygen supply duct 52 is connected to an external oxygen station 55. A dehydrator 56 is installed on the cold flue gas recirculation duct to further remove moisture from the recirculated gas. The gas in the air duct 53 and the cold flue gas recirculation duct is fed into the mixer 51 by a blower 57. Electric regulating valves are installed on these three ducts to control the proportion of each component. In this embodiment, the oxygen content of the combustion air formed in the mixer 51 is maintained within the range of 21% to 40%.

[0033] The output of mixer 51 is connected to the combustion-supporting inlet of flue gas cooling and dehydration device 6. The combustion-supporting gas absorbs the heat left by the high-temperature flue gas when passing through flue gas cooling and dehydration device 6, and after being heated, it is sent to the oxygen-fired burner 2 through the main combustion-supporting gas pipeline 14. An oxygen concentration analyzer is installed at the inlet of the oxygen-fired burner 2 in the main combustion-supporting gas pipeline 14 to monitor the oxygen concentration of the combustion air in real time.

[0034] The fuel gas blending system 7 is designed to address fuel fluctuation issues. This system includes one or more of the following arranged in parallel: hydrogen buffer tank 71, methane buffer tank 72, propane buffer tank 73, butane buffer tank 74, and nitrogen buffer tank 75.

[0035] In this embodiment, these buffer tanks are configured to reduce the pressure of each type of fuel gas entering the system to 0.2~0.3 MPa, and deliver it downstream in proportion to the target fuel gas calorific value. A mixer buffer tank 13 is connected in parallel to the outlet of the buffer tank, and the mixer buffer tank 13 is connected to the oxygen burner 2 through the main fuel gas pipeline.

[0036] In addition, a continuous light line 18 is branched off from the main fuel gas pipeline. The continuous light line 18 is directly connected to the oxygen burner 2 to maintain a continuous flame.

[0037] Example 4

[0038] Based on Embodiment 3 above, this embodiment optimizes the fuel gas component, such as... Figure 1 As shown, to further improve energy efficiency, a fuel gas heater 8 is installed in the system. A hot flue gas bypass 16 is branched onto the hot flue gas duct 15, and the hot flue gas bypass 16 is connected to the flue gas side inlet of the fuel gas heater 8. The flue gas side outlet of the fuel gas heater 8 is connected back to the downstream section of the hot flue gas duct 15. At the same time, a fuel gas preheating pipe 17 is branched onto the main fuel gas pipeline, and this pipe is connected to the fuel gas side inlet of the fuel gas heater 8. The heated fuel gas flows out from the fuel gas side outlet and connects to the downstream section of the main fuel gas pipeline.

[0039] This structure allows a portion of the hot flue gas to be separated to preheat the fuel gas, thereby increasing the sensible heat of the fuel entering the furnace.

[0040] Example 5

[0041] Based on any of the above embodiments, this embodiment optimizes the control components. The system is equipped with an intelligent control system 9, which is divided into a basic layer and an upper layer. The basic layer consists of a DCS (Distributed Control System) or a PLC (Programmable Logic Controller), mainly responsible for the sequential control and safety interlock logic of field valves and fans. The upper-layer control architecture includes a multivariable predictive controller and an artificial intelligence optimizer, which perform real-time optimization calculations on system operating parameters based on detected data such as temperature, pressure, and oxygen content. This is a common control method in the prior art and will not be elaborated upon here.

[0042] The working principle of this invention is as follows: The first step is the fuel gas blending and preheating process. The intelligent control system 9 instructs the fuel gas blending system 7 to operate based on the heat load required by the process. Hydrogen, methane, and other fuel gas components enter their respective buffer tanks and are pressure-regulated to 0.2~0.3 MPa by the pressure regulating device. Subsequently, according to the proportions calculated based on the target calorific value, the gas flows of each component converge into the mixer buffer tank 13 for homogenization. Before entering the furnace, a portion of the mixed fuel gas flows through the fuel gas heater 8. At this time, the high-temperature flue gas in the hot flue gas duct 15 enters the heater through the hot flue gas bypass 16, transferring heat to the fuel gas. The preheated fuel gas temperature rises, and it is then sent to the oxygen-fired burner 2 through the main fuel gas pipeline. The continuous ignition source is ensured by the continuous gas supply to the lamp line 18.

[0043] The second step involves the construction of the combustion atmosphere and the deep reheating process. Pure oxygen provided by oxygen station 55, circulating cold flue gas treated by dehydrator 56, and spare air are driven by blower 57 and controlled by an electric regulating valve into mixer 51. Based on feedback from the oxygen concentration analyzer, the control system adjusts the valve opening to stabilize the oxygen content in the combustion gas at 21%~40%. This low-temperature combustion gas then enters the combustion gas side of the rotary regenerative flue gas cooling and dehydrating device 6. At this point, the rotary flue gas cooling and dehydrating device 6 has just absorbed heat from the flue gas and rotated to this position. The combustion gas passes through the flue gas cooling and dehydrating device 6 and is heated to a high temperature, recovering the heat from the flue gas. It is then injected into the oxygen burner 2 through the main combustion gas pipeline 14.

[0044] Next is the oxy-fuel combustion and furnace heat exchange process. The preheated fuel and high-temperature combustion-supporting gas mix and burn violently at the oxy-fuel burner 2. Due to the removal or significant reduction of nitrogen, combustion efficiency is extremely high. The resulting high-temperature flue gas undergoes radiant and convective heat exchange with the process medium inside the furnace tubes in the radiant chamber 3 and convection chamber 4. Thermocouples and pressure transmitters monitor the furnace conditions in real time to ensure stable combustion.

[0045] Finally, there is the deep treatment and whitening process for the flue gas. After heat exchange, the flue gas enters the flue gas side of the rotary regenerative flue gas cooling and dehydrating device 6. The high-temperature flue gas washes over the device, causing the temperature to drop sharply below the dew point. Water vapor condenses, releasing latent heat, which is captured by the device. The condensate is discharged, and the dried flue gas is extracted by the induced draft fan 10. The airflow from the outlet of the induced draft fan 10 is distributed: part goes into circulation; part enters the cold flue gas emission pipe 11 for collection or emission; and the remaining part enters the third channel of the rotary regenerative device. In the third channel, the cold flue gas absorbs the residual heat from the flue gas cooling and dehydrating device 6 again, raising its temperature to the level required to eliminate white smoke. It is then discharged into the atmosphere via the cold flue gas whitening bypass 12, achieving zero-energy whitening.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A full-oxygen heating furnace system, characterized in that: Includes a furnace body (1), in which an oxygen burner (2) is installed; And a rotary regenerative flue gas cooling and dehydration device (6), the flue gas cooling and dehydration device (6) is connected to the hot flue gas duct (15) of the furnace body (1) to deeply cool and condense the high-temperature flue gas sent from the duct to remove some water vapor, and efficiently recover the sensible heat and latent heat in the flue gas. The combustion air distribution system (5) includes a mixer (51), which is equipped with an air duct (53), a cold flue gas circulation duct (54) and an oxygen supply duct (52) connected to the input end of the mixer (51) to form combustion gas. The output end of the mixer (51) is connected to the combustion gas side inlet of the flue gas cooling and dehydrating device (6). The combustion gas side outlet of the flue gas cooling and dehydrating device (6) is connected to the combustion gas main pipe (14). After absorbing the heat in the high-temperature flue gas, the combustion gas is sent to the oxygen burner (2) through the combustion gas main pipe (14).

2. The all-oxygen heating furnace system according to claim 1, characterized in that: The flue gas cooling and dehydrating device (6) is equipped with a third channel. The flue gas side outlet of the flue gas cooling and dehydrating device (6) is connected to an induced draft fan (10). The induced draft fan (10) is connected to a branch pipe. The branch pipe is connected to the cold flue gas circulation pipe (54), the cold flue gas emission pipe (11), and the third channel of the flue gas cooling and dehydrating device (6). The side outlet of the third channel is connected to a cold flue gas whitening bypass (12). The third channel preheats the cold flue gas that is directly discharged into the atmosphere to achieve whitening and demisting. The cold flue gas emission pipe (11) is sent to the subsequent CO2 product line for capture and utilization or direct discharge into the atmosphere.

3. The all-oxygen heating furnace system according to claim 1, characterized in that: A fuel gas distribution system (7) is provided, which includes one or more of the following: hydrogen buffer tank (71), methane buffer tank (72), propane buffer tank (73), butane buffer tank (74) and nitrogen buffer tank (75). A mixer buffer tank (13) is connected in parallel to the fuel gas distribution system (7). The mixer buffer tank (13) is connected to the oxygen burner (2) through the fuel gas main pipeline.

4. The all-oxygen heating furnace system according to claim 3, characterized in that: A fuel gas heater (8) is provided. A branch of the hot flue gas duct (15) is connected to a hot flue gas bypass (16). The hot flue gas bypass (16) is connected to the flue gas side inlet of the fuel gas heater (8). The flue gas side outlet of the fuel gas heater (8) is connected to the rear section of the hot flue gas duct (15). A branch of the fuel gas main pipeline is connected to a fuel gas preheating pipeline (17). The fuel gas preheating pipeline (17) is connected to the fuel gas side inlet of the fuel gas heater (8). The fuel gas side outlet of the fuel gas heater (8) is connected to the rear section of the fuel gas main pipeline, so as to separate a portion of the hot flue gas to preheat the fuel gas.

5. The all-oxygen heating furnace system according to claim 3, characterized in that: The main fuel gas pipeline is branched and connected to a continuous lamp line (18), which is connected to the oxygen burner (2).

6. The all-oxygen heating furnace system according to claim 3, characterized in that: The buffer tank of the fuel gas distribution system (7) is configured to reduce the pressure of each type of fuel gas to 0.2~0.3 MPa and deliver it to the mixer buffer tank (13) in proportion to the target fuel gas calorific value to mix the fuel gas.

7. The all-oxygen heating furnace system according to claim 1, characterized in that: The air duct (53), the cold flue gas circulation duct (54) and the oxygen supply duct (52) are all equipped with electric regulating valves, and the oxygen content formed in the mixer (51) is in the range of 21% to 40%.

8. The all-oxygen heating furnace system according to claim 1, characterized in that: The oxygen supply pipeline (52) is connected to the oxygen station (55), and a dehydrator (56) is installed on the cold flue gas circulation duct. The air pipeline (53) and the cold flue gas circulation duct are fed into the mixing via a blower (57).

9. The all-oxygen heating furnace system according to claim 1, characterized in that: The furnace body (1) is equipped with a radiation chamber (3) and a convection chamber (4), and is equipped with furnace tubes that absorb heat from the process medium. The top of the convection chamber (4) and the inlet and outlet of the flue gas cooling and dehydrating device (6) are equipped with flue gas analysis sampling port one (91), flue gas analysis sampling port two (92) and flue gas analysis sampling port three (93) respectively, to monitor the oxygen content of the flue gas and pollutant emissions in real time. An oxygen concentration analyzer is installed at the inlet of the combustion air main pipeline of the all-oxygen burner (2) to monitor the oxygen concentration of the combustion air in real time. The furnace body (1) is also equipped with thermocouples and pressure transmitters to provide real-time feedback on furnace temperature and pressure changes in each layer of the furnace.

10. The all-oxygen heating furnace system according to claim 9, characterized in that: An intelligent control system (9) is provided, which includes a base layer and an upper layer; the base layer is composed of a DCS or PLC and is responsible for sequential control and safety interlocking; the upper layer includes a multivariable predictive controller and an artificial intelligence optimizer.

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