Oxy-fuel combustion system and method suitable for heating furnace

Abstract

The invention belongs to the technical field of heating furnaces, and particularly relates to an oxygen-fuel combustion system and method suitable for a heating furnace. Air is separated into oxygen and nitrogen through an air separator, the oxygen passes through a control valve and a flow meter, fuel gas passes through the control valve and the flow meter and is conveyed to a heating furnace through a special pipeline, the fuel gas and the oxygen are subjected to non-premixed combustion, the heating furnace is divided into a preheating section, a heating section and a soaking section, and the temperature of each section is accurately controlled by adjusting a burner. Flue gas firstly passes through the residual oxygen detector to detect the oxygen concentration, then enters the waste heat boiler to recover heat, then is cooled by the cooler, and finally enters the carbon dioxide trapping device under the pushing of the fan. Flameless combustion in the furnace is achieved through oxygen-fuel combustion, the radiation heat exchange intensity in the furnace is improved, combustion is more uniform, waste heat is recycled through the waste heat boiler, the energy utilization rate is increased, and carbon emission is reduced through the carbon dioxide capturing and storing device.

Description

Technical Field

[0001] The invention belongs to the technical field of heating furnaces, and in particular relates to a full oxygen combustion system and method suitable for heating furnaces. Background Art

[0002] As an important national basic industry, China's steel industry, while supporting national development, also faces the dual challenges of environmental pollution and energy consumption. The steel industry has always been a major energy consumer in my country, accounting for 15% of the country's total energy consumption. The importance of its energy conservation and emission reduction work is self-evident. The steel rolling process is a process with a relatively large proportion of energy consumption in the steel production process. The energy consumption of the heating furnace accounts for 60% to 70% of the entire rolling process. Therefore, improving the thermal efficiency of the heating furnace has become the key to energy conservation and consumption reduction. At present, the heating of steel billets in modern steel production enterprises is almost entirely completed by using heating furnaces. Existing heating furnaces have the problems of high unit consumption and high energy consumption. my country has room for improvement in this area.

[0003] Oxygen combustion technology is an efficient and energy-saving combustion method. It uses pure oxygen instead of air as a combustion aid to mix with fuel to achieve more complete and precise combustion. Oxygen technology is a new energy-saving technology. Compared with ordinary combustion and oxygen-enriched combustion technology, it has the characteristics of improving combustion efficiency, reducing pollutant emissions, improving product quality and reducing energy consumption. With the increasing global requirements for energy conservation, emission reduction and environmental protection, oxyfuel combustion technology has broad development prospects as a clean and efficient way of energy utilization. At present, there are few publicly available oxyfuel combustion processes and system layouts for heating furnaces.

[0004] The Chinese patent with the announcement number CN116026159A discloses a heating furnace oxygen-matching combustion process system, which relates to the field of industrial heating technology, and includes: a mixer for mixing oxygen and a gas to be mixed as a combustion-supporting gas, a first online analyzer for monitoring the oxygen content in the combustion-supporting gas, an air preheater, an industrial furnace, a fuel device, a second online analyzer for monitoring the oxygen content in the flue gas flowing out of the industrial furnace, a cooler, and a recovery device; the mixer, the first online analyzer, the air preheater, and the air inlet of the industrial furnace are connected in sequence so that the air flow passes in sequence; the fuel device is connected to the air inlet; the air outlet of the industrial furnace, the air preheater, the second online analyzer, the cooler, and the recovery device are connected in sequence so that the air flow passes in sequence. The above invention uses a mixer for mixing oxygen and air, but this method will increase the emission of pollutants nitrogen oxides (NOx), and has the characteristics of poor combustion efficiency. Therefore, it is urgent for those skilled in the art to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the above-mentioned prior art will increase the emission of pollutant nitrogen oxides (NOx) and has the characteristics of poor combustion efficiency.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A full oxygen combustion system suitable for a heating furnace comprises an air separator, a fuel gas source, a heating furnace, an instrumentation and control device, a patrol-type residual oxygen detector, a waste heat boiler, a temperature detector, a cooler, a fan, a carbon dioxide capture device, a carbon dioxide storage device and a chimney; the air separator and the fuel gas source are connected to the heating furnace through a pipeline, the instrumentation and control device is arranged between the patrol-type residual oxygen detector and the air separator, the patrol-type residual oxygen detector is connected to the waste heat boiler through a pipeline, the waste heat furnace is connected to the cooler, the cooler is connected to the fan through a pipeline, the fan is connected to the carbon dioxide capture device through a pipeline, and the carbon dioxide capture device is also connected to the carbon dioxide storage device and the chimney.

[0008] By adopting the above technical solution, oxygen and fuel gas are transported separately and mixed and burned instantly, which ensures the uniformity and stability of combustion and improves combustion efficiency. Since there is no nitrogen involved in the combustion process, the generation of nitrogen oxides is greatly reduced, which is beneficial to reducing air pollution. The carbon dioxide generated in the combustion process can be effectively captured by the carbon dioxide capture device, which can be stored or reused, reducing greenhouse gas emissions and helping to address climate change. The heat in the flue gas is recovered by the waste heat boiler. This part of the recovered heat can be used to preheat the materials entering the furnace or generate steam, thereby improving the overall energy utilization efficiency. Higher combustion efficiency means that less fuel is needed to achieve the same heating effect, thereby reducing energy consumption and saving costs.

[0009] Furthermore, the pipeline includes an oxygen pipeline and a gas pipeline; the oxygen pipeline is used to connect the air separator and the heating furnace, and a control valve 1 and an oxygen flow meter are also provided on the oxygen pipeline, and the oxygen flow meter is electrically connected to the instrumentation and control device; the gas pipeline is used to connect the gas source and the heating furnace, and a control valve 2 and a gas flow meter are also provided on the gas pipeline.

[0010] By adopting the above technical solution, the control valve 1 on the oxygen pipeline and the control valve 2 on the gas pipeline can accurately adjust the flow of oxygen and gas to ensure that the two are mixed and burned in the best proportion. This precise control helps to achieve the most efficient combustion process. The oxygen flow meter and the gas flow meter can monitor the flow of oxygen and gas in real time and feed the data back to the instrumentation and control device. The instrumentation and control device automatically adjusts the opening of the control valve according to these data to ensure that the combustion process is always in the best state. Oxygen and gas are transported through their respective pipelines to ensure instant mixed combustion in the combustion chamber. This method can avoid the uneven mixing that may occur during the premixing process, thereby improving the combustion efficiency. By accurately controlling the ratio of oxygen and gas, more uniform combustion can be achieved, local overheating or inadequate combustion can be reduced, and the overall combustion efficiency can be improved. Accurate flow control can ensure that the amount of oxygen and gas used for each combustion is just right, avoiding excessive or insufficient fuel supply, thereby reducing fuel waste and improving energy utilization efficiency. By accurately controlling the combustion process, incompletely burned substances in the flue gas can be reduced, the temperature of the flue gas can be increased, and waste heat can be recovered more effectively, further improving energy utilization efficiency.

[0011] Furthermore, the heating furnace is connected to the waste heat boiler through a flue gas pipeline, and a patrol-type residual oxygen detector is also provided between the heating furnace and the waste heat boiler, and the patrol-type residual oxygen detector is electrically connected to the instrumentation and control device.

[0012] By adopting the above technical solution, the patrol-type residual oxygen detector can detect the oxygen concentration in the flue gas in real time and provide key data in the combustion process. The instrument control device automatically adjusts the supply ratio of oxygen and fuel gas according to the detected oxygen concentration data to ensure that the combustion process is always in the best state and improve the combustion efficiency. By real-time monitoring of the oxygen concentration in the flue gas, the combustion conditions can be adjusted in time to ensure that the mixing ratio of oxygen and fuel gas reaches the optimal level, avoid incomplete combustion or excessive combustion, and improve the combustion efficiency. Accurate combustion control can reduce unnecessary fuel consumption and reduce operating costs. Full oxygen combustion itself has reduced the generation of nitrogen oxides, and through real-time monitoring and adjustment of the patrol-type residual oxygen detector, the combustion conditions can be further optimized and the emission of nitrogen oxides can be reduced. By accurately controlling the combustion process, unnecessary fuel consumption can be reduced, thereby reducing carbon dioxide emissions. Combined with a carbon dioxide capture device, carbon emissions can be managed more effectively.

[0013] Furthermore, the waste heat boiler is connected to the cooler through a cooling pipeline, and a first temperature detector is also provided on the cooling pipeline. The heater is connected to the fan through an exhaust pipeline, and a second temperature detector is also provided on the exhaust pipeline.

[0014] By adopting the above technical solution, the flue gas passes through the waste heat boiler, which can recover a large amount of heat in the flue gas and improve energy utilization efficiency. The flue gas temperature is further reduced through the cooler to ensure full utilization of waste heat and reduce heat loss. The first temperature detector arranged on the cooling pipeline can monitor the temperature of the flue gas before it enters the cooler in real time and provide key data. The second temperature detector arranged on the exhaust pipeline can monitor the temperature of the flue gas after it comes out of the cooler in real time and provide another key data point. Through these two temperature detectors, the instrumentation and control device can adjust the working status of the cooler and the waste heat boiler in real time to ensure the efficiency of the waste heat recovery and cooling process. The temperature detector can promptly detect abnormal conditions in the system, such as excessively high or low temperature, which helps to quickly diagnose and handle faults and improve the reliability and safety of the system. Through real-time monitoring data, the operating status of the equipment can be predicted, maintenance and maintenance can be carried out in advance, and the occurrence of sudden failures can be reduced.

[0015] Furthermore, the first temperature detector and the second temperature detector are electrically connected to the instrumentation and control device.

[0016] By adopting the above technical solution, the first temperature detector and the second temperature detector can monitor the temperature changes of the flue gas in the cooling pipeline and the exhaust pipeline in real time, and transmit the data to the instrumentation and control device. The instrumentation and control device can quickly adjust the working state of the system based on these real-time data to ensure that the temperature is controlled within the optimal range. By real-time monitoring the temperature of the flue gas before entering the cooler (the first temperature detector) and the temperature after leaving the cooler (the second temperature detector), it can ensure that the working state of the waste heat boiler and the cooler is always in the best state, maximize the waste heat recovery efficiency, and accurate temperature control can reduce unnecessary energy loss and improve the overall energy utilization efficiency. The temperature detector can promptly detect abnormal conditions in the system, such as excessively high or low temperature, which helps to quickly diagnose and handle faults and improve the reliability and safety of the system. Through real-time monitoring data, the operating state of the equipment can be predicted, maintenance and maintenance can be carried out in advance, and the occurrence of sudden failures can be reduced.

[0017] The present invention also includes a full oxygen combustion method suitable for a heating furnace. The full oxygen combustion of the heating furnace is achieved through the above-mentioned full oxygen combustion system suitable for the heating furnace. After the air is separated by the air separator, oxygen and nitrogen are generated. Oxygen is used as a combustion-supporting gas. It passes through the control valve one and then the oxygen flowmeter and is sent into the heating furnace through the oxygen pipeline to participate in the combustion process. The fuel gas is connected from the fuel gas source, passes through the control valve two and the fuel gas flowmeter in turn, and is finally transported into the heating furnace through the fuel gas pipeline.

[0018] Furthermore, the flue gas after combustion is tested for oxygen concentration through the patrol-type residual oxygen detector, and the patrol-type residual oxygen detector detects the oxygen concentration of the flue gas, and the detection data is fed back to the instrumentation and control device. The flue gas enters the waste heat boiler for heat recovery. After the waste heat boiler, the flue gas is further cooled by the cooler. The first temperature detector and the second temperature detector are installed before and after the cooler to monitor the temperature change of the flue gas. The cooled flue gas enters the carbon dioxide capture device under the action of the fan, and the remaining gas after the carbon dioxide is collected is discharged through the chimney.

[0019] Furthermore, when the instrumentation and control device monitors that the temperature of the heating furnace exceeds the preset target temperature, the instrumentation and control device reduces the gas supply by reducing the opening of the gas control valve, thereby effectively reducing the temperature inside the furnace. On the contrary, when the temperature of the heating furnace is lower than the set target temperature, the instrumentation and control device increases the opening of the gas control valve and increases the gas supply to raise the temperature of the heating furnace to the required level.

[0020] Furthermore, atmosphere detection ports are opened at different temperature sections inside the heating furnace, and the atmosphere detection ports are equipped with exhaust sampling probes. Sampling samples are sent to the patrol-type residual oxygen detector to monitor the oxygen content in the atmosphere inside the furnace. When an increase in gas flow is detected, the instrumentation and control device increases the opening of the oxygen regulating valve on the oxygen pipeline by adjusting the oxygen regulating valve, thereby increasing the oxygen supply and ensuring that the fuel can be completely burned. When the gas flow decreases, the instrumentation and control device will also make adjustments to reduce the opening of the oxygen regulating valve to reduce the oxygen flow and maintain combustion efficiency.

[0021] The present invention has the following beneficial effects:

[0022] 1. The present invention uses pure oxygen instead of air as a combustion aid, thus avoiding the participation of nitrogen, achieving more complete and efficient combustion, improving the combustion temperature and combustion efficiency, and recovering waste heat in the flue gas through the waste heat boiler and cooler, further improving the energy utilization efficiency. The first temperature detector and the second temperature detector are electrically connected to the instrumentation and control device to monitor the flue gas temperature in real time to ensure the efficiency and stability of the waste heat recovery process. The oxygen flow meter and the gas flow meter, as well as the electrical connection of the patrol-type residual oxygen detector to the instrumentation and control device, achieve precise control of the ratio of oxygen and gas, ensure that the combustion process is always in the best state, and further improve the combustion efficiency;

[0023] 2. The full oxygen combustion of the present invention avoids the participation of nitrogen and significantly reduces the generation of nitrogen oxides. The patrol-type residual oxygen detector monitors the oxygen concentration in the flue gas in real time, adjusts the combustion conditions through the instrumentation and control device, further optimizes the combustion process, reduces the emission of nitrogen oxides, and reduces unnecessary fuel consumption by precisely controlling the combustion process, thereby reducing carbon dioxide emissions. Combined with the carbon dioxide capture device, carbon emissions can be managed more effectively and meet strict environmental protection standards. The first temperature detector and the second temperature detector are electrically connected to the instrumentation and control device to monitor the flue gas temperature in real time to ensure that the system is always in the best working state and further reduce pollutant emissions;

[0024] 3. The temperature detector and patrol-type residual oxygen detector of the present invention can monitor the key parameters in the system in real time, discover abnormal conditions in time, help to quickly diagnose and handle faults, improve the reliability and safety of the system, and realize automatic control of the combustion process and the waste heat recovery process through the instrumentation and control device, thereby reducing the need for manual intervention, simplifying the operating process, and improving the simplicity and efficiency of operation. The temperature detector and patrol-type residual oxygen detector can record key data, provide support for subsequent data analysis and optimization, help to continuously improve system performance, extend equipment life, and reduce the frequency of maintenance and replacement of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0026] Among them, 1-air separator; 2-control valve 1; 3-oxygen flowmeter; 4-oxygen pipeline; 5-gas source; 6-control valve 7-gas flowmeter; 8-gas pipeline; 9-heating furnace; 10-instrumentation and control device; 11-patrol type residual oxygen detector; 12-waste heat boiler; 13-first temperature detector; 14-cooler; 15-second temperature detector; 16-fan; 17-carbon dioxide capture device; 18-carbon dioxide storage device; 19-chimney. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0028] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0029] like Figure 1 As shown, a full oxygen combustion system suitable for a heating furnace mainly includes an air separator 1, a fuel gas source 5, a heating furnace 9, an instrumentation and control device 10, a patrol-type residual oxygen detector 11, a waste heat boiler 12, a first temperature detector 13 and a second temperature detector 15, a cooler 14, a fan 16, a carbon dioxide capture device 17, a carbon dioxide storage device 18 and a chimney 19; the air separator 1 is responsible for separating air into oxygen and nitrogen, wherein oxygen is connected to the heating furnace 9 through an oxygen pipeline 4, on which a control valve 2 and an oxygen flowmeter 3 are provided, the latter being electrically connected to the instrumentation and control device 10; nitrogen is connected to the fuel gas source 5 through a fuel gas pipeline 8, on which a control valve 6 and a fuel gas flowmeter 7 are provided; fuel gas provided by the fuel gas source 5 enters the heating furnace 9 through the fuel gas pipeline 8, and the heating furnace 9 is divided into a preheating section, a heating section and a soaking section, The temperature in the furnace is controlled by adjusting the number and type of burners. The flue gas generated by the heating furnace 9 is connected to the waste heat boiler 12 through a flue gas pipeline. A patrol-type residual oxygen detector 11 is provided on the pipeline, which is electrically connected to the instrumentation and control device 10 and is used to detect the oxygen content in the flue gas. After the waste heat boiler 12 recovers the heat in the flue gas, it is connected to the cooler 14 through a cooling pipeline. A first temperature detector 13 is provided on the pipeline to monitor the temperature change of the flue gas. The cooled flue gas is connected to the fan 16 through an exhaust pipeline. A second temperature detector 15 is provided on the pipeline, which is also electrically connected to the instrumentation and control device 10 and is used to monitor the temperature change of the flue gas in real time. The fan 16 pushes the flue gas into the carbon dioxide capture device 17 to capture the carbon dioxide in the flue gas. The captured carbon dioxide is stored in the carbon dioxide storage device 18. The treated flue gas is finally discharged through the chimney 19.

[0030] The whole system realizes real-time monitoring and automatic control of the temperature and oxygen content in the combustion process through the instrumentation and control device 10, ensuring the efficient combustion, energy recovery, environmental protection and emission reduction and intelligent control of the system. After the air is separated by the air separator 1, oxygen and nitrogen are generated. Oxygen, as a combustion-supporting gas, first passes through the control valve 1 2 to ensure the stable supply and safe operation of the gas, and then passes through the oxygen flow meter 3 and is sent to the heating furnace 9 through the oxygen pipeline 4 to participate in the combustion process. Nitrogen is supplied to other users of the steel plant to meet their specific needs. At the same time, the gas is connected from the gas source 5, passes through the control valve 2 6, the gas flow meter 7, and then is transported to the inside of the heating furnace 9 through the dedicated gas pipeline 8. Here, the gas and oxygen are non-premixed and burned to achieve efficient energy conversion. The heating furnace 9 is generally divided into preheating section, heating section, and soaking section. By adjusting the number and type of burners, the temperature in the furnace can be accurately controlled to adapt to the temperature requirements of different heating stages and meet the process requirements. The flue gas after combustion is first tested for oxygen concentration by a patrol-type residual oxygen detector 11. After the information is fed back, the gas and oxygen dosage is adjusted in real time through the instrumentation and control device 10 to adjust the residual oxygen content to ensure combustion efficiency and safety. Then, the flue gas enters the waste heat boiler 12 for heat recovery to improve energy utilization efficiency. After the waste heat boiler 12, the flue gas is further cooled by the cooler 14. The first temperature detector 13 and the second temperature detector 15 are installed before and after the cooler 14 to monitor the temperature change of the flue gas. Finally, the cooled flue gas enters the carbon dioxide capture device 17 under the action of the fan 16. Here, carbon dioxide is effectively captured and stored in the carbon dioxide storage device 18, and the remaining gas is discharged through the chimney 19. Through the full oxygen combustion system of the heating furnace 9, the heating furnace 9 can not only achieve efficient combustion and energy conversion, but also maximize heat recovery and reduce environmental pollution.

[0031] Working principle: Thermocouples are installed in multiple key temperature sections inside the heating furnace 9, which are connected to the instrumentation and control device 10 through temperature sensors, so that the temperature changes in the furnace can be monitored in real time. When the temperature in the furnace is detected to exceed the preset target temperature, the instrumentation and control device 10 will automatically respond by reducing the opening of the gas control valve 6 to reduce the gas supply, thereby effectively reducing the temperature in the furnace. On the contrary, if the temperature in the furnace is lower than the set target temperature, the instrumentation and control device 10 will increase the opening of the gas control valve 6 and increase the gas supply to raise the temperature in the furnace to the required level. This feedback-based control mechanism ensures accurate control of the temperature in the furnace, optimizes combustion efficiency, and helps to improve energy efficiency and the stability of the production process; atmosphere detection ports are opened in different temperature sections inside the heating furnace 9, and the detection ports are equipped with extraction sampling probes for extracting gas samples in the furnace. Subsequently, these samples are sent to the patrol-type residual oxygen detector 11 to monitor the oxygen content in the furnace atmosphere; the goal is to maintain a constant residual oxygen content in the furnace, which is closely related to the content of the gas, and there is a positive correlation between the two. When the gas flow rate increases, the instrumentation and control device 10 will automatically respond by adjusting the oxygen regulating valve 2 on the oxygen pipeline to increase its opening, thereby increasing the oxygen supply and ensuring that the fuel can be completely burned; on the contrary, when the gas flow rate decreases, the instrumentation and control device will also make adjustments to reduce the opening of the oxygen regulating valve 2 to reduce the oxygen flow rate and maintain combustion efficiency. Through intelligent control strategies, the stability and efficiency of the combustion process in the furnace can be ensured.

[0032] The preferred embodiments of the present invention are described in detail above; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A full oxygen combustion system suitable for a heating furnace, characterized in that: The invention comprises an air separator (1), a fuel gas source (5), a heating furnace (9), an instrument control device (10), a patrol type residual oxygen detector (11), a waste heat boiler (12), a temperature detector, a cooler (14), a fan (16), a carbon dioxide capture device (17), a carbon dioxide storage device (18) and a chimney (19); the air separator (1) is connected to the fuel gas source (5) through a pipeline to the heating furnace (9); the patrol type residual oxygen detector (11) is connected to the waste heat boiler (12), a temperature detector, a cooler (14), a fan (16), a carbon dioxide capture device (17), a carbon dioxide storage device (18) and a chimney (19); The instrument control device (10) is arranged between the air separators (1), the patrol type residual oxygen detector (11) is connected to the waste heat boiler (12) through a pipeline, the waste heat boiler is connected to the cooler (14), the cooler (14) is connected to the fan (16) through a pipeline, the fan (16) is connected to the carbon dioxide capture device (17) through a pipeline, and the carbon dioxide capture device (17) is also connected to the carbon dioxide storage device (18) and the chimney (19).

2. The oxyfuel combustion system suitable for a heating furnace according to claim 1, characterized in that: The pipeline comprises an oxygen pipeline (4) and a gas pipeline (8); the oxygen pipeline (4) is used to connect the air separator (1) and the heating furnace (9); a control valve 1 (2) and an oxygen flow meter (3) are also provided on the oxygen pipeline (4); the oxygen flow meter (3) is electrically connected to the instrumentation and control device (10); the gas pipeline (8) is used to connect the gas source (5) and the heating furnace (9); a control valve 2 (6) and a gas flow meter (7) are also provided on the gas pipeline (8).

3. The oxyfuel combustion system suitable for a heating furnace according to claim 1, characterized in that: The heating furnace (9) is connected to the waste heat boiler (12) via a flue gas pipeline, and a patrol-type residual oxygen detector (11) is also provided between the heating furnaces (9), and the patrol-type residual oxygen detector (11) is electrically connected to the instrumentation and control device (10).

4. The oxyfuel combustion system suitable for a heating furnace according to claim 1, characterized in that: The waste heat boiler (12) is connected to the cooler (14) via a cooling pipeline, and a first temperature detector (13) is also provided on the cooling pipeline. The cooler is connected to the fan (16) via an exhaust pipeline, and a second temperature detector (15) is also provided on the exhaust pipeline.

5. The oxyfuel combustion system suitable for a heating furnace according to claim 1, characterized in that: The first temperature detector (13) and the second temperature detector (15) are electrically connected to the instrumentation and control device (10).

6. A full oxygen combustion method suitable for a heating furnace, comprising the full oxygen combustion system suitable for a heating furnace (9) according to any one of claims 1 to 5, characterized in that: After the air is separated by the air separator (1), oxygen and nitrogen are generated. The oxygen, as a combustion-supporting gas, passes through the control valve one (2), then passes through the oxygen flow meter (3), and is sent to the heating furnace (9) through the oxygen pipeline (4) to participate in the combustion process. The fuel gas is connected from the fuel gas source (5), passes through the control valve two (6), the fuel gas flow meter (7), and is finally sent to the heating furnace (9) through the fuel gas pipeline.

7. The oxyfuel combustion method suitable for a heating furnace according to claim 6, characterized in that: The flue gas after combustion is tested for oxygen concentration by the patrol-type residual oxygen detector (11). The patrol-type residual oxygen detector (11) tests the oxygen concentration of the flue gas, and the test data is fed back to the instrumentation and control device (10). The flue gas enters the waste heat boiler (12) for heat recovery. After the waste heat boiler (12), the flue gas is further cooled by the cooler (14). The first temperature detector (13) and the second temperature detector (15) are installed before and after the cooler (14) to monitor the temperature change of the flue gas. The cooled flue gas enters the carbon dioxide capture device (17) under the action of the fan (16), and the remaining gas after the carbon dioxide is collected is discharged through the chimney (19).

8. The full oxygen combustion method suitable for a heating furnace according to claim 6, characterized in that: When the instrumentation and control device (10) detects that the temperature of the heating furnace (9) exceeds a preset target temperature, the instrumentation and control device (10) reduces the opening of the gas control valve to reduce the gas supply, thereby effectively reducing the temperature inside the furnace. On the contrary, when the temperature of the heating furnace (9) is lower than the set target temperature, the instrumentation and control device (10) increases the opening of the gas control valve and increases the gas supply to raise the temperature of the heating furnace (9) to a desired level.

9. The full oxygen combustion method applicable to a heating furnace according to claim 6, characterized in that: The heating furnace (9) is provided with atmosphere detection ports at different temperature sections. The atmosphere detection ports are equipped with suction sampling probes. The sampled samples are sent to the patrol-type residual oxygen detector (11) to monitor the oxygen content in the atmosphere in the furnace. When an increase in the gas flow rate is detected, the instrumentation and control device (10) increases the opening of the oxygen regulating valve on the oxygen pipeline by adjusting the oxygen regulating valve, thereby increasing the oxygen supply and ensuring that the fuel can be completely burned. When the gas flow rate decreases, the instrumentation and control device (10) will also make adjustments to reduce the opening of the oxygen regulating valve to reduce the oxygen flow rate and maintain the combustion efficiency.

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