Flue gas circulation oxygen-enriched combustion system with gas mixing function

Abstract

The utility model relates to a flue gas circulation oxygen-enriched combustion system with a gas mixing function, which comprises a heating furnace with a combustor, an oxygen main pipe, a fuel gas main pipe, an intelligent combustion control system, a gas preheater and a combustion-supporting gas mixer, the combustion-supporting gas mixer comprises a mixing box, a partition plate is fixed to the middle of the bottom of the inner side of the mixing box, a channel is reserved between the upper end of the partition plate and the top wall of the inner side of the mixing box, the partition plate divides the interior of the mixing box into a first space and a second space with the upper ends communicated, and stirring shafts are rotationally connected into the first space and the second space through fixed shafts; a gas outlet port of the oxygen main pipe is communicated with the bottom of the first space, a gas outlet port of the second smoke pipeline is communicated with the bottom of the first space, a gas inlet port of the mixed gas pipe is communicated with the bottom of the second space, and the mixed gas pipe penetrates through the gas preheater and is connected with an oxygen inlet of the heating furnace with the combustor. And the gas main pipe penetrates through the gas preheater and is connected with a gas inlet of the heating furnace with the burner.

Description

Technical Field

[0001] This utility model patent relates to a flue gas circulation oxygen-enriched combustion system with a mixed gas function, which is a new combustion system used in the petrochemical, metallurgical, building materials and other industries, and particularly relates to a flue gas circulation oxygen-enriched combustion system with a mixed gas function. Background Art

[0002] In the petrochemical and metallurgical industries, carbon dioxide emissions are mainly produced by combustion. If the carbon dioxide produced by combustion can be enriched and collected through a method, carbon dioxide emissions can be greatly reduced, thereby reducing the greenhouse effect. In the flue gas circulation oxygen-enriched combustion system, the flue gas is recycled and transported to the burner again together with the combustion-supporting gas to participate in combustion, but the flue gas needs to be quickly mixed with the combustion-supporting gas. Therefore, we propose a flue gas circulation oxygen-enriched combustion system with a mixing gas function to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a flue gas circulation oxygen-enriched combustion system with a mixed gas function to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical solutions: a flue gas circulation oxygen-enriched combustion system with a mixed gas function, including a heating furnace with a burner, an oxygen main pipe, a gas main pipe and an intelligent combustion control system, and also includes:

[0004] Flue gas heater, gas preheater, high-sealed variable frequency fan, flue gas cooler, flue gas dehydrator and combustion-supporting gas mixer;

[0005] The combustion-supporting gas mixer comprises a mixing box, a partition is fixed at the middle position of the inner bottom of the mixing box, and a channel is left between the upper end of the partition and the inner top wall of the mixing box, the partition divides the interior of the mixing box into a first space and a second space connected at the upper end, and a stirring shaft is rotatably connected in the first space and the second space;

[0006] The gas outlet port of the oxygen main pipe is connected to the bottom of the first space, the gas outlet port of the second flue gas pipe is connected to the bottom of the first space, the gas inlet port of the mixed gas pipe is connected to the bottom of the second space, and the mixed gas pipe passes through the gas preheater and is connected to the oxygen inlet of the heating furnace with a burner, and the gas main pipe passes through the gas preheater and is connected to the gas inlet of the heating furnace with a burner.

[0007] Preferably, pump impeller 1 and pump impeller 2 are fixed on the top upper surface of the mixing box, the upper end of the stirring shaft in the first space is drivingly connected to the impeller shaft of pump impeller 1, the upper end of the stirring shaft in the second space is drivingly connected to the impeller shaft of pump impeller 2, the flue gas duct 2 is fixed and connected to the outer peripheral wall of pump impeller 1, the oxygen main pipe is fixed and connected to the outer peripheral wall of pump impeller 2, the flue gas duct 2 is connected to a regulating valve 1, and the valve stem of the regulating valve 1 is coaxially fixedly connected to gear 1, the oxygen main pipe is connected to a regulating valve 2, and the valve stem of the regulating valve 2 is coaxially fixedly connected to gear 2.

[0008] Preferably, a vertical pole is fixed on the top upper surface of the mixing box, and the upper end of the vertical pole is rotatably connected to the midpoint of the lever, one end of the cylinder is hinged on the vertical pole, and the other end is hinged to the lever at a position away from the midpoint, and strip through holes are provided at both ends of the lever, and two cantilevers corresponding to the first space and the second space are fixed on the outer wall of the mixing box, and rack 1 and rack 2 are slidably connected to the two cantilevers respectively, rack 1 is meshed with gear 1, and rack 2 is meshed with gear 2, and pins are hinged at the upper ends of rack 1 and rack 2, and the two pins are respectively inserted in the two strip through holes, and the pins can slide in the corresponding strip through holes.

[0009] Preferably, the smoke outlet of the heating furnace with a burner is connected to a smoke duct one, and the smoke duct one passes through the smoke heat exchanger and the gas preheater in sequence and is connected to the inlet of the high-seal variable frequency fan, and the smoke duct one is connected to the smoke heat exchanger, the outlet of the high-seal variable frequency fan is connected to the inlet of the smoke dehydrator, and the outlet of the smoke dehydrator is connected to the combustion-supporting gas mixer through the smoke duct two, and the middle part of the smoke duct two is connected to the smoke exhaust pipe.

[0010] Preferably, flame arresters are connected to the ends of the mixed gas pipe and the gas main pipe close to the heating furnace with the burner, and a pressure gauge is connected to the mixed gas pipe.

[0011] Preferably, the outlet end of the high-seal variable frequency fan is connected to an emergency shut-off valve, and an electric flow control valve and a gas flow meter are connected in sequence on the second smoke duct along the direction of smoke flow, and the smoke exhaust pipe is located between the electric flow control valve and the smoke dehydrator, and an electric flow control valve and an emergency shut-off valve are connected in sequence on the smoke exhaust pipe along the direction of smoke flow.

[0012] Preferably, the intelligent combustion control system includes:

[0013] Adaptive adjustment control terminal and system server;

[0014] The oxygen main pipe and the gas main pipe are connected with a filter, an emergency shut-off valve, a pressure regulating valve, a micro-regulating valve, a relief valve, a gas flow meter and a pressure transmitter in sequence near the air inlet end and along the air flow direction;

[0015] An online analyzer for O content is installed on the mixed gas pipe;

[0016] A COe, O detection analyzer and a flue gas sampling detection point are arranged on a flue gas duct and located between a flue gas heat collector and a heating furnace with a burner;

[0017] A CO online analyzer installed on the exhaust pipe and close to the inlet end;

[0018] A furnace temperature sensor and a furnace pressure sensor are arranged on the furnace wall of a heating furnace with a burner.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1) After the flue gas and oxygen enter the mixing box, the airflow power of the flue gas and oxygen is used to drive the stirring shaft to mix the flue gas and oxygen, so as to achieve full and efficient mixing of the flue gas and oxygen in the flow process, and the flue gas concentration in the combustion-supporting gas can be adjusted, which is convenient to operate.

[0021] 2) The concentration of CO2 components in the emitted flue gas reaches more than 95%. CO2 can be recycled as one of the products to achieve true zero emissions. No pollutants such as NOx and SOx will be generated during the combustion process.

[0022] 3) The heat in the reflux flue gas is fully utilized to preheat the combustion-supporting gas and fuel gas or other uses, thereby improving the combustion efficiency.

[0023] 4) The combustion system adopts pure oxygen combustion technology and flue gas reflow technology, which solves the problem of nitrogen oxides produced by traditional air-assisted combustion gas, and also solves the problem of uneven temperature field distribution and excessive local temperature in the pure oxygen combustion furnace.

[0024] 5) Through the intelligent combustion control system, it can monitor the combustion status of the heating furnace with burner in real time, detect the flue gas components, control the amount of reflux flue gas, and can dynamically adjust and report to the environmental protection department in time according to the preset values. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the general assembly structure of the utility model;

[0026] Figure 2 for Figure 1 Schematic diagram of the oxygen main pipe and gas main pipe structure;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the mixing box in the present utility model.

[0028] In the figure: 1. Heating furnace with burner; 2. Flue gas heat collector; 3. Gas preheater; 4. High-sealed variable frequency fan; 5. Flue gas cooler; 6. Flue gas dehydrator; 7. Combustion-supporting gas mixer; 8. COe, O2 detection analyzer; 9. O2 content online analyzer; 10. CO2 online analyzer; 11. Filter; 12. Emergency shut-off valve; 13. Pressure regulating valve; 14. Micro regulating valve; 15. Overflow valve; 16. Gas flow meter; 17. Pressure transmitter; 18. Pressure gauge; 19. Electric flow control valve; 20. Flame arrester; 21. Self-adaptive regulation control terminal; 22. System server; 23. Flue gas sampling detection point; 24. Furnace temperature sensor; 25. Furnace pressure sensor; 26. Flue gas duct one; 27. Flue gas duct two; 28. Exhaust pipe; 29. ​​Mixing gas pipe; 30. Mixing box; 31. Partition; 32. First space; 33. Second space; 34. Stirring shaft; 35. Pump wheel one; 36. Pump wheel two; 37. Control valve one; 38. Gear one; 39. Cantilever; 40. Rack one; 41. Control valve two; 42. Gear two; 43. Rack two; 44. Vertical pole; 45. Push rod; 46. Strip through hole; 47. Pin rod; 48. Cylinder. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figures 1 to 3 The utility model provides a technical solution: a flue gas circulation oxygen-enriched combustion system with a mixed gas function, including a heating furnace 1 with a burner, an oxygen main pipe, a gas main pipe and an intelligent combustion control system, and also includes:

[0031] Flue gas heat collector 2, gas preheater 3, high-sealing variable frequency fan 4, flue gas cooler 5, flue gas dehydrator 6 and combustion-supporting gas mixer 7;

[0032] The combustion-supporting gas mixer 7 includes a mixing box 30, a partition 31 is fixed at the middle position of the inner bottom of the mixing box 30, and a channel is left between the upper end of the partition 31 and the inner top wall of the mixing box 30, the partition 31 divides the interior of the mixing box 30 into a first space 32 and a second space 33 connected at the upper end, and a stirring shaft 34 is rotatably connected in the first space 32 and the second space 33;

[0033] The gas outlet port of the oxygen main pipe is connected to the bottom of the first space 32, the gas outlet port of the second flue gas duct 27 is connected to the bottom of the first space 32, the gas inlet port of the mixed gas pipe 29 is connected to the bottom of the second space 33, and the mixed gas pipe 29 passes through the gas preheater 3 and is connected to the oxygen inlet of the heating furnace 1 with a burner, and the gas main pipe passes through the gas preheater 3 and is connected to the gas inlet of the heating furnace 1 with a burner.

[0034] In this embodiment, a pump impeller 35 and a pump impeller 36 are fixed to the top upper surface of the mixing box 30, the upper end of the stirring shaft 34 in the first space 32 is drivingly connected to the impeller shaft of the pump impeller 35, the upper end of the stirring shaft 34 in the second space 33 is drivingly connected to the impeller shaft of the pump impeller 36, the flue gas duct 27 is fixed and connected to the outer peripheral wall of the pump impeller 35, the oxygen main pipe is fixed and connected to the outer peripheral wall of the pump impeller 36, the flue gas duct 27 is connected to a regulating valve 37, and the valve stem of the regulating valve 37 is coaxially fixedly connected to a gear 38, and the oxygen main pipe is connected to a regulating valve 41, and the valve stem of the regulating valve 41 is coaxially fixedly connected to a gear 2 42.

[0035] In this embodiment, a vertical rod 44 is fixed to the top upper surface of the mixing box 30, and the upper end of the vertical rod 44 is rotatably connected to the midpoint of the lever 45. One end of the cylinder 48 is hinged on the vertical rod 44, and the other end is hinged on the lever 45 away from the midpoint. Strip through holes 46 are provided at both ends of the lever 45. Two cantilevers 39 corresponding to the first space 32 and the second space 33 are fixed on the outer wall of the mixing box 30, and a rack 40 and a rack 2 43 are slidably connected to the two cantilevers 39, respectively. The rack 1 40 is meshed with the gear 1 38, and the rack 2 43 is meshed with the gear 2 42. The upper ends of the rack 1 40 and the rack 2 43 are hinged with pin rods 47, and the two pin rods 47 are respectively inserted into the two strip through holes 46, and the pin rods 47 can slide in the corresponding strip through holes 46.

[0036] In the present embodiment, the smoke outlet of the heating furnace 1 with a burner is connected to a smoke duct 26, and the smoke duct 26 passes through the smoke heat exchanger 2 and the gas preheater 3 in sequence and is connected to the inlet of the high-seal variable frequency fan 4, and the smoke duct 26 is connected to the smoke heat exchanger 2, the outlet of the high-seal variable frequency fan 4 is connected to the inlet of the smoke dehydrator 6, and the outlet of the smoke dehydrator 6 is connected to the combustion-supporting gas mixer 7 through the smoke duct 27, and the middle part of the smoke duct 27 is connected to the smoke exhaust pipe 28.

[0037] In this embodiment, the flame arrester 20 is connected to the mixed gas pipe 20 and the end of the gas main pipe close to the heating furnace 1 with the burner, and the mixed gas pipe 20 is connected to the pressure gauge 18.

[0038] In this embodiment, the outlet end of the high-seal variable frequency fan 4 is connected to an emergency shut-off valve 12, and the smoke duct 27 is sequentially connected with an electric flow control valve 19 and a gas flow meter 16 along the direction of smoke flow, and the smoke exhaust pipe 28 is located between the electric flow control valve 19 and the smoke dehydrator 6, and the smoke exhaust pipe 28 is sequentially connected with an electric flow control valve 19 and an emergency shut-off valve 12 along the direction of smoke flow.

[0039] In this embodiment, the intelligent combustion control system includes:

[0040] Adaptive adjustment control terminal 21 and system server 22;

[0041] The oxygen main pipe and the gas main pipe are connected in sequence near the air inlet end and along the air flow direction with a filter 11, an emergency shut-off valve 12, a pressure regulating valve 13, a micro-regulating valve 14, a relief valve 15, a gas flow meter 16 and a pressure transmitter 17;

[0042] An O2 content online analyzer 9 provided on the mixed gas pipe 29;

[0043] A COe and O2 detection analyzer 8 and a flue gas sampling detection point 23 are arranged on a flue gas duct 26 and located between a flue gas heat collector 2 and a heating furnace 1 with a burner;

[0044] A CO2 online analyzer 10 disposed on the exhaust pipe 28 and close to the inlet end;

[0045] A furnace temperature sensor 24 and a furnace pressure sensor 25 are arranged on the furnace wall of the heating furnace 1 with a burner.

[0046] In the above embodiment, the heating furnace 1 with a burner is the actuator of the system, in which the fuel gas and the combustion-supporting gas are burned, and the heat generated is used for heating the materials and taking the heat from the flue gas. 2 is a heat exchanger, which can use the heat of the flue gas for purposes such as boiling water, so that the temperature of the high-temperature flue gas is initially reduced to about 300°C. The gas preheater 3 adopts a spiral tube double preheating heat exchanger, which uses the heat of the flue gas to preheat the fuel gas and the combustion-supporting gas. The flue gas cooler 5 uses a condensing agent to absorb the waste heat of the flue gas, so that the flue gas temperature is reduced to below 100°C, and the water vapor in the flue gas is converted into liquid water, so as to maximize the recovery of the latent heat of vaporization in the flue gas. At the same time, the flue gas The condensed water produced after the air is cooled is discharged promptly and effectively. The flue gas dehydrator 6 uses gravity or centripetal force to settle the sewage and separate the sewage from the flue gas. The combustion-supporting gas mixer 7 is used to fully mix the flue gas and oxygen and provide combustion-supporting gas for the heating furnace 1 with a burner. The high-sealing performance fan 4 leads the flue gas from the heating furnace to the flue gas duct to provide kinetic energy for the flue gas. The high-sealing performance fan 4 adopts a fan with high sealing and variable frequency performance to prevent smoke leakage and control the smoke flow rate. The flame arrester 20 is installed on the combustion-supporting gas pipeline and the gas pipeline before entering the burner to prevent backfire.

[0047] Working principle and advantages of this utility model: When this flue gas circulation oxygen-enriched combustion system with mixed gas function is used, the working process is as follows:

[0048] When the burner is just started, no smoke is generated, so the burner burns pure oxygen for a short period of time. The fuel gas and oxygen are burned in proportion to the chemical equivalence. After working for a period of time, smoke is generated stably.

[0049] The flue gas generated by the heating furnace 1 with a burner is introduced into the flue gas duct 1 by the high-sealed variable frequency fan 4. The flue gas passes through the gas preheater 3 and the flue gas heat exchanger 2, and then passes through the flue gas cooler 5 and the flue gas dehydrator 6 for dehydration and is divided into two paths. One path is directly discharged through the exhaust pipe 28, and the other path flows into the mixing box 30 to mix with oxygen. The oxygen concentration of the combustion-supporting agent after the flue gas and oxygen are mixed can be adjusted in any proportion in the range of 30% to 35%. The combustion-supporting gas and the fuel gas are preheated by the gas preheater 3 and then enter the burner for combustion. The generated flue gas is burned through a cyclic heat exchange again until the CO2 concentration reaches more than 95%. The flue gas is cooled and sent to the process area for processing and used as a raw material for making dry ice and other products.

[0050] During the use of the utility model, the control of combustion, the control of the amount of refluxed smoke and the discharge of carbon dioxide are all controlled by the intelligent combustion control system:

[0051] 1) For the combustion control of the heating furnace 1 with a burner, the furnace temperature sensor 24 and the furnace pressure sensor 25 detect the furnace temperature and pressure, and the COe and O2 detection analyzer 8 is used to detect oxygen and unburned combustibles in the flue gas, such as CO, CH4, H2, etc. The sensor and the analyzer transmit the signal to the adaptive adjustment control terminal 21, the adaptive adjustment control terminal 21 analyzes the data, uploads the data to the system server 22, makes an adjustment judgment according to the control parameters expected by the system server 22, and outputs a signal to the primary actuator such as the micro-regulating valve 14, the pressure regulating valve 13, etc., to dynamically adjust the pressure and flow of the combustion-supporting gas and the fuel gas, so that the combustion system as a whole can work smoothly in a safe and energy-saving state.

[0052] 2) As for the control of the amount of refluxed flue gas, the amount of refluxed flue gas directly affects the oxygen content of the combustion-supporting gas. The oxygen content of the combustion-supporting gas should be maintained at 30%~35% to achieve oxygen-enriched combustion. Therefore, the flue gas flow meter 16 monitors the flue gas flow, and the O2 content online analyzer 9 detects the oxygen content in the combustion-supporting gas. The two sensors input signals to the adaptive adjustment control terminal 21, and the system server 22 makes a judgment and outputs signals to the high-seal variable frequency fan 4 and the electric flow control valve 19 to adjust the suction volume and the flue gas flow so that the oxygen content of the combustion-supporting gas is in an oxygen-enriched state.

[0053] 3) For the control of carbon dioxide emission, the CO2 online analyzer 10 detects the carbon dioxide concentration on the smoke exhaust branch of the flue gas pipeline and inputs the signal to the adaptive adjustment control terminal 21. The system server 22 makes a judgment and outputs a signal to the electric flow control valve 19. If the test result shows that the CO2 concentration is greater than 95%, the electric flow control valve 19 is fully opened, and a part of the CO2 is discharged and collected and sent to the process area for processing.

[0054] 4) During the operation of the combustion system, various parameters will be collected, stored and analyzed in the system server 22. After the analysis, the combustion parameters will be displayed on the smart display terminal. After analyzing the data, the factory administrator can issue adjustment instructions through the system control terminal. The instructions are sent to the adaptive adjustment control terminal. The adaptive adjustment control terminal 21 further adjusts each valve after analysis. The emission reporting terminal can contact the local environmental protection department to upload the specific system working conditions and emission conditions in real time. Various data can be viewed on the web page as an administrator.

[0055] like Figure 3 As shown, the flue gas and oxygen enter the bottom of the first space 32 together and flow upward, enter the second space 33 from the upper end and flow downward, and then are output from the mixed gas pipe 29. While the flue gas flows in the flue gas duct 27, it drives the impeller shaft in the pump wheel 1 35 to rotate, so that the impeller shaft drives the stirring shaft 34 in the first space 32 to rotate, and the flue gas and oxygen in the first space 32 are stirred and mixed. While the oxygen passes through the oxygen main pipe, it drives the impeller shaft in the pump wheel 2 36 to rotate, so that the impeller shaft drives the stirring shaft 34 in the second space 33 to rotate, and the flue gas and oxygen in the second space 33 are stirred and mixed, thereby achieving full and efficient mixing of the flue gas and oxygen in the flow process.

[0056] In the present embodiment, the cylinder 48 is extended and retracted to control the swing of the lever 45, so that the two ends of the lever 45 drive the rack 1 40 and the rack 2 43 to move up and down alternately through the strip-shaped through hole 46 and the pin 47, so that the rack 1 40 drives the regulating valve 1 37 to open wider through the gear 1 37, while the rack 2 43 drives the regulating valve 2 41 to open narrower through the gear 2 42, thereby increasing the smoke concentration, and the rack 1 40 drives the regulating valve 1 37 to open narrower through the gear 1 37, while the rack 2 43 drives the regulating valve 2 41 to open wider through the gear 2 42, thereby decreasing the smoke concentration, thereby realizing the adjustment of the smoke concentration in the mixed gas, and the operation is simple and convenient.

[0057] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0058] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A flue gas circulation oxygen-enriched combustion system with a mixed gas function, comprising a heating furnace (1) with a burner, an oxygen main pipe, a gas main pipe and an intelligent combustion control system, characterized in that: Also includes: A flue gas heat extractor (2), a gas preheater (3), a high-sealing variable frequency fan (4), a flue gas cooler (5), a flue gas dehydrator (6) and a combustion-supporting gas mixer (7); The combustion-supporting gas mixer (7) comprises a mixing box (30), a partition (31) is fixed at a middle position of the inner bottom of the mixing box (30), and a channel is left between the upper end of the partition (31) and the inner top wall of the mixing box (30), the partition (31) divides the interior of the mixing box (30) into a first space (32) and a second space (33) which are connected at the upper ends, and a stirring shaft (34) is rotatably connected to the first space (32) and the second space (33); The gas outlet port of the oxygen main pipe is connected to the bottom of the first space (32), the gas outlet port of the second flue gas pipe (27) is connected to the bottom of the first space (32), the gas inlet port of the mixed gas pipe (29) is connected to the bottom of the second space (33), and the mixed gas pipe (29) passes through the gas preheater (3) and is connected to the oxygen inlet of the heating furnace (1) with a burner, and the gas main pipe passes through the gas preheater (3) and is connected to the gas inlet of the heating furnace (1) with a burner.

2. A flue gas circulation oxygen-enriched combustion system with a mixed gas function according to claim 1, characterized in that: A pump wheel 1 (35) and a pump wheel 2 (36) are fixed on the top upper surface of the mixing box (30); the upper end of the stirring shaft (34) in the first space (32) is drivingly connected to the impeller shaft of the pump wheel 1 (35); the upper end of the stirring shaft (34) in the second space (33) is drivingly connected to the impeller shaft of the pump wheel 2 (36); the flue gas duct 2 (27) is fixed to and communicated with the outer peripheral wall of the pump wheel 1 (35); the oxygen main pipe is fixed to and communicated with the outer peripheral wall of the pump wheel 2 (36); the flue gas duct 2 (27) is connected to a regulating valve 1 (37), and the valve stem of the regulating valve 1 (37) is coaxially fixedly connected to a gear 1 (38); the oxygen main pipe is connected to a regulating valve 2 (41), and the valve stem of the regulating valve 2 (41) is coaxially fixedly connected to a gear 2 (42).

3. A flue gas circulation oxygen-enriched combustion system with mixed gas function according to claim 2, characterized in that: A vertical rod (44) is fixed on the upper surface of the top of the mixing box (30). The upper end of the vertical rod (44) is rotatably connected to the midpoint of the lever (45). One end of the cylinder (48) is hinged on the vertical rod (44), and the other end is hinged on a position of the lever (45) away from the midpoint. Both ends of the lever (45) are provided with strip-shaped through holes (46). Two cantilevers (39) corresponding to the first space (32) and the second space (33) are fixed on the outer wall of the mixing box (30). ), and the two cantilevers (39) are respectively slidably connected with a rack 1 (40) and a rack 2 (43), the rack 1 (40) is meshingly connected with the gear 1 (38), the rack 2 (43) is meshingly connected with the gear 2 (42), the upper ends of the rack 1 (40) and the rack 2 (43) are both hinged with a pin rod (47), the two pin rods (47) are respectively inserted into the two strip-shaped through holes (46), and the pin rods (47) can slide in the corresponding strip-shaped through holes (46).

4. The flue gas circulation oxygen-enriched combustion system with mixed gas function according to claim 1, characterized in that: The smoke outlet of the heating furnace (1) with a burner is connected to a smoke duct 1 (26), and the smoke duct 1 (26) passes through the smoke heat exchanger (2) and the gas preheater (3) in sequence and is connected to the inlet of the high-sealed variable frequency fan (4), and the smoke duct 1 (26) is connected to the smoke heat exchanger (2), the outlet of the high-sealed variable frequency fan (4) is connected to the inlet of the smoke dehydrator (6), and the outlet of the smoke dehydrator (6) is connected to the combustion-supporting gas mixer (7) through the smoke duct 2 (27), and the middle part of the smoke duct 2 (27) is connected to the smoke exhaust pipe (28).

5. The flue gas circulation oxygen-enriched combustion system with mixed gas function according to claim 4, characterized in that: The mixed gas pipe (29) and the gas main pipe are both connected to a flame arrester (20) at one end close to the heating furnace (1) with a burner, and the mixed gas pipe (29) is connected to a pressure gauge (18).

6. The flue gas circulation oxygen-enriched combustion system with mixed gas function according to claim 5, characterized in that: The outlet end of the high-seal variable frequency fan (4) is connected to an emergency shut-off valve (12); the second smoke duct (27) is connected to an electric flow control valve (19) and a gas flow meter (16) in sequence along the direction of smoke flow; the smoke exhaust pipe (28) is located between the electric flow control valve (19) and the smoke dehydrator (6); the smoke exhaust pipe (28) is connected to an electric flow control valve (19) and an emergency shut-off valve (12) in sequence along the direction of smoke flow.

7. The flue gas circulation oxygen-enriched combustion system with mixed gas function according to claim 6, characterized in that: The intelligent combustion control system comprises: Adaptive adjustment control terminal (21) and system server (22); A filter (11), an emergency shut-off valve (12), a pressure regulating valve (13), a micro-regulating valve (14), a relief valve (15), a gas flow meter (16) and a pressure transmitter (17) are sequentially connected to the oxygen main pipe and the gas main pipe near the air inlet end and along the air flow direction; An O2 content online analyzer (9) disposed on the mixed gas pipe (29); A COe and O2 detection analyzer (8) and a flue gas sampling detection point (23) arranged on a flue gas duct (26) and located between a flue gas heat collector (2) and a heating furnace (1) with a burner; A CO2 online analyzer (10) disposed on the smoke exhaust pipe (28) and close to the inlet end; A furnace temperature sensor (24) and a furnace pressure sensor (25) are arranged on the furnace wall of a heating furnace (1) with a burner.

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