Heating furnace system

Abstract

The utility model discloses a heating furnace system which comprises a heating furnace, a flue gas heat exchanger, a flue gas cooler, an oxygen supply system and a first fan. A first heat exchange medium inlet of the flue gas heat exchanger is communicated with a flue gas outlet of the heating furnace, a first heat exchange medium outlet of the flue gas heat exchanger is communicated with a flue gas inlet of the flue gas cooler, and a second heat exchange medium inlet of the flue gas heat exchanger is communicated with a flue gas outlet of the flue gas cooler; a second heat exchange medium outlet of the flue gas heat exchanger is communicated with an inlet of the first fan; an outlet of the first fan is communicated with a combustion-supporting gas inlet of the heating furnace; and the oxygen supply system is communicated with an outlet of the first fan and is used for supplying rich oxygen. According to the heating furnace system, NOx emission of the heating furnace can be effectively reduced, and the heat efficiency of the heating furnace is improved.

Description

Technical Field

[0001] The present application relates to the field of petrochemical technology, and in particular to a heating furnace system. Background Art

[0002] Heating furnaces are key energy supply equipment in petrochemical production processes. Their nitrogen oxide emissions are directly related to the plant's total nitrogen oxide emissions. Nitrogen oxides are one of the primary air pollutants produced during the combustion of fuel gas within heating furnaces. To meet increasingly stringent environmental regulations, it is imperative to reduce nitrogen oxide generation during the combustion process in heating furnaces.

[0003] Nitrogen oxides produced during the combustion process are mainly divided into thermal NOx and rapid NOx. Regardless of the process in which NOx is produced, the participation of nitrogen in the combustion environment is required.

[0004] Existing heating furnaces generally use air to assist combustion, and the air contains up to 79% nitrogen. On the one hand, the combustion process will produce a large amount of nitrogen oxides. On the other hand, the nitrogen that does not participate in the combustion reaction will carry away a large amount of flue gas waste heat and discharge it into the air, affecting the improvement of thermal efficiency. Utility Model Content

[0005] The Summary of the Utility Model introduces a series of simplified concepts that will be further described in the Detailed Description of the Utility Model. The Summary of the Utility Model of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, according to a first aspect of the present invention, a heating furnace system is provided, which includes a heating furnace, a flue gas heat exchanger, a flue gas cooler, an oxygen supply system and a first fan.

[0007] The first heat exchange medium inlet of the flue gas heat exchanger is connected to the flue gas outlet of the heating furnace, the first heat exchange medium outlet of the flue gas heat exchanger is connected to the flue gas inlet of the flue gas cooler, the second heat exchange medium inlet of the flue gas heat exchanger is connected to the flue gas outlet of the flue gas cooler, and the second heat exchange medium outlet of the flue gas heat exchanger is connected to the inlet of the first fan;

[0008] The outlet of the first fan is connected to the combustion-supporting gas inlet of the heating furnace;

[0009] The oxygen supply system is communicated with the outlet of the first blower for supplying enriched oxygen.

[0010] Exemplarily, the heating furnace system further includes a first flow regulating device, a second flow regulating device and a chimney;

[0011] The inlet of the first flow regulating device is communicated with the flue gas outlet of the heating furnace, and the outlet of the first flow regulating device is communicated with the gas inlet of the chimney;

[0012] The inlet of the second flow regulating device is communicated with the flue gas outlet of the heating furnace, and the outlet of the second flow regulating device is communicated with the inlet of the first heat exchange medium.

[0013] Exemplarily, the oxygen supply system comprises an oxygen supply unit and an air supply unit;

[0014] The oxygen supply unit and the air supply unit are both communicated with the combustion-supporting gas inlet.

[0015] Exemplarily, the oxygen supply unit is an oxygen production system, an oxygen storage tank or an oxygen pipe network;

[0016] The air supply unit includes a second fan and an air suction port.

[0017] Exemplarily, the heating furnace system further includes a third flow regulating device and a fourth flow regulating device.

[0018] The inlet of the third flow regulating device is communicated with the oxygen supply unit, and the outlet of the third flow regulating device is communicated with the outlet of the first blower;

[0019] The inlet of the fourth flow regulating device is communicated with the air supply unit, and the outlet of the fourth flow regulating device is communicated with the outlet of the first fan.

[0020] Exemplarily, the heating furnace system further includes a first oxygen content detection device and a second oxygen content detection device.

[0021] The first oxygen content detection device is provided at the combustion-supporting gas inlet, and is used to detect the oxygen content in the combustion-supporting gas entering the combustion-supporting gas inlet;

[0022] The second oxygen content detection device is arranged in the furnace of the heating furnace and is used to detect the oxygen content in the furnace.

[0023] Exemplarily, the first fan is a variable frequency fan;

[0024] The heating furnace system also includes a control device, which is connected to the first oxygen content detection device, the second oxygen content detection device, the first fan, the first flow regulating device, the second flow regulating device, the third flow regulating device and the fourth flow regulating device. The control device is used to adjust at least one of the frequency of the first fan, the opening of the first flow regulating device, the opening of the second flow regulating device, the opening of the third flow regulating device and the opening of the fourth flow regulating device according to the detection results of the first oxygen content detection device and / or the second oxygen content detection device.

[0025] Exemplarily, the heating furnace system further includes a quick-opening damper;

[0026] The quick-opening damper is communicated with the combustion-supporting gas inlet.

[0027] Exemplarily, the flue gas cooler is a heat exchanger, and the flue gas cooler includes a flue gas flow path and a cooling medium flow path;

[0028] The flue gas inlet of the flue gas cooler and the flue gas outlet of the flue gas cooler are respectively the inlet of the flue gas flow path and the outlet of the flue gas flow path;

[0029] The heat exchanger further includes a condensed water outlet, which is communicated with the flue gas flow path.

[0030] According to the heating furnace system of the present invention, the circulating flue gas from the heating furnace is evenly mixed with the oxygen-rich gas from the oxygen supply system by arranging a flue gas heat exchanger and a flue gas cooler, and then used as the combustion-supporting gas. On the one hand, the nitrogen concentration in the combustion-supporting gas can be made much lower than the nitrogen concentration in the air, so that the combustion-supporting gas is a nitrogen-lean gas, and the combustion environment is changed to a nitrogen-lean environment, thereby achieving the purpose of reducing nitrogen oxide emissions; on the other hand, by circulating the high-temperature flue gas, the amount of flue gas emitted by the heating furnace can be reduced, the heat loss of the flue gas can be reduced, the thermal efficiency of the heating furnace can be improved, and the purpose of energy saving and consumption reduction can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following drawings of this application are hereby incorporated as part of this application for understanding this application. The drawings show the embodiments of this application and their descriptions, and are used to explain the device and principle of this application. In the drawings,

[0032] Figure 1 This is a structural diagram of a heating furnace system according to an embodiment of the present application;

[0033] Description of reference numerals:

[0034] 1-Air supply unit, 2-Oxygen supply unit, 3-Condensate treatment system, 4-Cooling medium supply unit, 5-Cooling medium recovery unit, 6-Fuel gas supply system, 7-Heating furnace, 8-Flue gas heat exchanger, 9-Flue gas cooler, 10-First fan, 11-Burner, 12-Quick opening damper, 13-First flow control device, 14-Second flow control device, 15-Third flow control device, 16-Fourth flow control device. DETAILED DESCRIPTION

[0035] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, some technical features well known in the art are not described in order to avoid confusion with the present application.

[0036] It should be understood that the present application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present application to those skilled in the art. In the drawings, the dimensions and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals throughout represent like elements.

[0037] It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the teachings of this application, the first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part.

[0038] Spatially relative terms, such as "below," "beneath," "beneath," "above," "upper," etc., may be used herein for convenience to describe the relationship of one element or feature to other elements or features illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientations depicted in the figures.

[0039] The purpose of using terms herein is only to describe specific embodiments and is not intended to limit the present application. When used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0040] The embodiments of the utility model are described herein with reference to cross-sectional views which are schematic diagrams of ideal embodiments (and intermediate structures) of the present application. Thus, variations in the shapes shown due to, for example, manufacturing techniques and / or tolerances can be expected. Therefore, the embodiments of the present application should not be limited to the specific shapes shown herein, but include shape deviations due to, for example, manufacturing. Therefore, what is shown in the figures is schematic in nature, and their shapes are not intended to show the actual shape of the device and are not intended to limit the scope of the present application.

[0041] Refer to the attached Figure 1 A heating furnace system according to an embodiment of the present application is exemplarily described, which includes a heating furnace 7 , a flue gas heat exchanger 8 , a flue gas cooler 9 , an oxygen supply system, and a first fan 10 .

[0042] The first heat exchange medium inlet of the flue gas heat exchanger 8 is connected to the flue gas outlet of the heating furnace 7. The first heat exchange medium outlet of the flue gas heat exchanger 8 is connected to the flue gas inlet of the flue gas cooler 9. The second heat exchange medium inlet of the flue gas heat exchanger 8 is connected to the flue gas outlet of the flue gas cooler 9. The second heat exchange medium outlet of the flue gas heat exchanger 8 is connected to the inlet of the first fan 10. The outlet of the first fan 10 is connected to the combustion-supporting gas inlet of the heating furnace 7. An oxygen supply system is connected to the combustion-supporting gas inlet for supplying enriched oxygen to the combustion-supporting gas inlet.

[0043] The flue gas cooler 9 is used to cool the flue gas from the flue gas heat exchanger 8, so that part of the water vapor in the flue gas condenses, which is beneficial to reducing the total amount of flue gas, reducing the adverse effects of water vapor in the flue gas on the operation of the heating furnace, and increasing the proportion of carbon dioxide in the flue gas, which facilitates the subsequent carbon capture of carbon dioxide in the flue gas.

[0044] The flue gas heat exchanger 8 is used to exchange heat between the high-temperature flue gas from the flue gas outlet of the heating furnace 7 and the cooled low-temperature flue gas from the flue gas cooler 9. On the one hand, the flue gas heat exchanger 8 and the flue gas cooler 9 can perform a two-stage cooling of the high-temperature flue gas from the flue gas outlet of the heating furnace 7, reducing it to below the dew point. On the other hand, the flue gas heat exchanger 8 can increase the temperature of the flue gas that subsequently enters the first fan 10 and the combustion-supporting gas inlet as combustion-supporting gas, thereby improving the thermal efficiency of the heating furnace.

[0045] The oxygen-rich gas provided by the oxygen supply system is mixed with the flue gas from the second heat exchange medium outlet of the flue gas heat exchanger 8 at the outlet of the first fan 10. The gas formed after uniform mixing serves as the combustion-supporting gas, and the mixed gas enters the combustion-supporting gas inlet to participate in combustion.

[0046] According to the heating furnace system of this embodiment, on the one hand, the nitrogen concentration in the combustion-supporting gas can be made much lower than the nitrogen concentration in the air, so that the combustion-supporting gas is a nitrogen-lean gas, and the combustion environment is changed to a nitrogen-lean environment, thereby achieving the purpose of reducing nitrogen oxide emissions; on the other hand, by circulating the high-temperature flue gas, the amount of flue gas emitted by the heating furnace can be reduced, the heat loss of the flue gas can be reduced, the thermal efficiency of the heating furnace can be improved, and the purpose of energy saving and consumption reduction can be achieved.

[0047] In the present embodiment, the heating furnace 7 can be a tubular heating furnace, which can include a burner 11, a radiation chamber, a convection chamber and a furnace pipe. The furnace pipe can be located in the radiation chamber and the convection chamber at the same time, or only in the radiation chamber. There can be one or more burners 11, and the burner 11 can be arranged at the bottom of the radiation chamber and / or on the side wall of the radiation chamber. The burner 11 includes a fuel gas inlet and a combustion-supporting gas inlet. The fuel gas inlet can be connected to the fuel gas supply device 6, and the fuel gas supply device 6 can be a fuel gas supply pipeline, a fuel gas storage tank or other suitable fuel gas source. The top of the convection chamber is provided with a smoke outlet.

[0048] Exemplarily, the heating furnace 7 can be a continuous reforming four-in-one furnace. The continuous reforming four-in-one furnace mainly includes a radiation chamber and a convection chamber, and a burner is provided in the radiation chamber. In order to improve the combustion uniformity of the furnace and obtain a better furnace temperature field, side wall burners are generally provided to provide all the loads required by the four-in-one furnace medium. Under the operating conditions of the four-in-one furnace, the furnace temperature of the radiation chamber is about 700℃~900℃, and the radiation chamber is provided with a reforming feed furnace tube. The reforming raw materials flow in the radiation furnace tube and complete the heat absorption process. The convection chamber is generally provided with a steam production section to recover the heat of the high-temperature flue gas, which can reduce the flue gas temperature to about 120℃~180℃. A flue gas outlet is provided at the top of the convection chamber, and the flue gas temperature from the flue gas outlet is about 120℃~180℃.

[0049] For example, the flue gas heat exchanger 8 may be a gas-to-gas heat exchanger such as a shell and tube heat exchanger or a plate heat exchanger.

[0050] Exemplarily, the flue gas cooler 9 is a heat exchanger, such as an air-to-air heat exchanger or an air-to-liquid heat exchanger. The flue gas cooler 9 includes a flue gas flow path and a cooling medium flow path. The flue gas inlet and the flue gas outlet of the flue gas cooler 9 are the inlet and outlet of the flue gas flow path, respectively. The inlet and outlet of the cooling medium flow path are connected to the cooling medium supply unit 4 and the cooling medium recovery unit 5, respectively. Exemplarily, the cooling medium supplied by the cooling medium recovery unit 4 can be cooling water or other suitable gaseous or liquid cooling medium. The flue gas entering the flue gas flow path and the cooling medium entering the cooling medium flow path exchange heat in the flue gas cooler 9 to reduce the flue gas temperature to below the dew point temperature. The flue gas cooler 9 also includes a condensate outlet, which is connected to the flue gas flow path. Condensed water condensed in the flue gas flow path can be discharged from the flue gas cooler 9 through the condensate outlet. Furthermore, the condensate outlet is connected to the condensate treatment system 3, which is used to further process the condensate, such as for waste heat recovery. Condensed water carries a certain amount of heat, which can be further transferred to the combustion-supporting gas through a heat exchanger, thereby further reducing fuel gas consumption and achieving the goal of energy saving and consumption reduction.

[0051] In this embodiment, the oxygen supply system includes an oxygen supply unit 1 and an air supply unit 2. The oxygen supply unit 1 can be an oxygen storage tank, an oxygen generator or an oxygen generator, which is used to supply oxygen. It should be noted that the oxygen mentioned here may refer to pure oxygen or enriched oxygen (the volume content of oxygen in the gas is higher than 21%). The air supply unit 2 may include a second fan and an air suction port, the air inlet of the second fan is connected to the air suction port, and the outlet of the second fan is connected to the outlet of the first fan 10. The air supply unit 2 is used to supply air. It should be noted that the air mentioned here refers to a gas with an oxygen volume content of approximately 21% and a nitrogen volume content of approximately 78%.

[0052] See attached Figure 1 In the embodiment of the present application, the heating furnace system further includes a first flow regulating device 13 and a second flow regulating device 14 .

[0053] The inlet of the first flow regulating device 13 is connected to the flue gas outlet of the heating furnace 7, and the outlet of the first flow regulating device 13 is connected to the gas inlet of the chimney. The inlet of the second flow regulating device 14 is connected to the flue gas outlet of the heating furnace 7, and the outlet of the second flow regulating device 14 is connected to the first heat exchange medium inlet of the flue gas heat exchanger 8.

[0054] The first flow regulating device 13 and the second flow regulating device 14 can be used to adjust the amount of flue gas flowing to the chimney and the flue gas heat exchanger 8, that is, they can be used to adjust the proportion of circulating flue gas in the combustion-supporting gas.

[0055] For example, the first flow regulating device 13 and the second flow regulating device 14 may be regulating baffles (eg, flue baffles).

[0056] See attached Figure 1 In the embodiment of the present application, the heating furnace system further includes a third flow regulating device 15 and a fourth flow regulating device 16 .

[0057] The inlet of the third flow regulating device 15 is connected to the oxygen supply unit 1, and the outlet of the third flow regulating device 15 is connected to the outlet of the first fan 10. The third flow regulating device 15 is used to regulate the amount of oxygen provided by the oxygen supply unit 1. The inlet of the fourth flow regulating device 16 is connected to the air supply unit 2, and the outlet of the fourth flow regulating device 16 is connected to the outlet of the first fan 10. The fourth flow regulating device 16 is used to regulate the amount of air provided by the air supply unit.

[0058] By properly controlling the amount of oxygen and air provided by the third flow regulating device 15 and the fourth flow regulating device 16, the amount of oxygen involved in combustion can be adjusted to ensure the combustion state of the burner 11. Preferably, the volume content of the oxygen-enriched mixture of oxygen and air can be 21% to 100%.

[0059] For example, the third flow regulating device 15 may be a regulating valve (eg, an electric regulating valve), and the fourth flow regulating device 16 may be a regulating baffle (eg, an air duct baffle).

[0060] In an embodiment of the present application, the heating furnace system further includes a first oxygen content detection device and a second oxygen content detection device.

[0061] The first oxygen content detection device is disposed at the combustion-supporting gas inlet (e.g., at the combustion-supporting gas inlet or in a pipeline adjacent to the combustion-supporting gas inlet) to detect the oxygen content (i.e., oxygen concentration) in the combustion-supporting gas entering the combustion-supporting gas inlet. The second oxygen content detection device is disposed in the hearth of the heating furnace 7 (i.e., in the radiation chamber) to detect the oxygen content in the hearth. Exemplarily, the first oxygen content detection device and the second oxygen content detection device can be zirconia analyzers.

[0062] Therefore, the ratio of flue gas and oxygen in the combustion-supporting gas can be adjusted according to the detection results of the first oxygen content detection device and / or the second oxygen content detection device, so that the oxygen content in the combustion-supporting gas and / or the oxygen content in the furnace is maintained within a specific range to achieve the best combustion effect.

[0063] Furthermore, in the embodiment of the present application, the first fan 10 is a variable frequency fan, and the rotation speed of the first fan 10 can be changed by adjusting the frequency of the first fan 10, thereby adjusting the medium flow through the first fan 10.

[0064] The heating furnace system also includes a control device connected to the first oxygen content detection device, the second oxygen content detection device, the first fan 10, the first flow regulating device 13, the second flow regulating device 14, the third flow regulating device 15, and the fourth flow regulating device 16. The control device is used to adjust at least one of the frequency of the first fan 10, the opening of the first flow regulating device 13, the opening of the second flow regulating device 14, the opening of the third flow regulating device 15, and the opening of the fourth flow regulating device 16 based on the detection results of the first oxygen content detection device and / or the second oxygen content detection device, so as to maintain the oxygen content in the combustion-supporting gas and / or the oxygen content in the furnace within a specific range to achieve the best combustion effect. For example, the control device may include a single-chip microcomputer or other suitable control device.

[0065] Illustratively, through the above-mentioned control device, the oxygen content in the combustion-supporting gas (the detection result detected by the first oxygen content detection device) can be maintained at 10%-40%, and / or the oxygen content in the furnace (the detection result detected by the second oxygen content detection device) can be maintained at 1%-5% to achieve the best combustion effect.

[0066] See attached Figure 1 In the embodiment of the present application, the heating furnace system further includes a quick-opening damper 12, which is connected to the combustion-supporting gas inlet. During the start-up phase of the heating furnace 7, the second flow regulating device 14, the third flow regulating device 15, and the fourth flow regulating device 16 can be closed, and the first flow regulating device 13 and the quick-opening damper 12 can be opened. Air is supplied through the quick-opening damper 12, and the burner 11 is in a natural ventilation state, using air as the combustion-supporting gas. When the heating furnace 7 is operating normally, the quick-opening damper 12 is gradually closed, the second flow regulating device 14, the third flow regulating device 15, and the fourth flow regulating device 16 are opened, and the first fan 10 is started, gradually transitioning to a combustion mode in which the gas mixed with recycled flue gas and oxygen-enriched gas is used as the combustion-supporting gas.

[0067] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0068] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0069] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various utility model aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach of the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features that are less than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0070] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0071] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

[0072] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A heating furnace system, characterized in that: It includes heating furnace, flue gas heat exchanger, flue gas cooler, oxygen supply system and first fan; The first heat exchange medium inlet of the flue gas heat exchanger is connected to the flue gas outlet of the heating furnace, the first heat exchange medium outlet of the flue gas heat exchanger is connected to the flue gas inlet of the flue gas cooler, the second heat exchange medium inlet of the flue gas heat exchanger is connected to the flue gas outlet of the flue gas cooler, and the second heat exchange medium outlet of the flue gas heat exchanger is connected to the inlet of the first fan; The outlet of the first fan is connected to the combustion-supporting gas inlet of the heating furnace; The oxygen supply system is communicated with the outlet of the first blower for supplying enriched oxygen.

2. The heating furnace system according to claim 1, characterized in that: The heating furnace system further includes a first flow regulating device, a second flow regulating device and a chimney; The inlet of the first flow regulating device is communicated with the flue gas outlet of the heating furnace, and the outlet of the first flow regulating device is communicated with the gas inlet of the chimney; The inlet of the second flow regulating device is communicated with the flue gas outlet of the heating furnace, and the outlet of the second flow regulating device is communicated with the inlet of the first heat exchange medium.

3. The heating furnace system according to claim 2, characterized in that: The oxygen supply system comprises an oxygen supply unit and an air supply unit; The oxygen supply unit and the air supply unit are both communicated with the combustion-supporting gas inlet.

4. The heating furnace system according to claim 3, characterized in that: The oxygen supply unit is an oxygen production system, an oxygen storage tank or an oxygen pipe network; The air supply unit includes a second fan and an air suction port.

5. The heating furnace system according to claim 3, characterized in that: The heating furnace system further includes a third flow regulating device and a fourth flow regulating device; The inlet of the third flow regulating device is communicated with the oxygen supply unit, and the outlet of the third flow regulating device is communicated with the outlet of the first blower; The inlet of the fourth flow regulating device is communicated with the air supply unit, and the outlet of the fourth flow regulating device is communicated with the outlet of the first fan.

6. The heating furnace system according to claim 5, characterized in that: The heating furnace system further includes a first oxygen content detection device and a second oxygen content detection device; The first oxygen content detection device is provided at the combustion-supporting gas inlet, and is used to detect the oxygen content in the combustion-supporting gas entering the combustion-supporting gas inlet; The second oxygen content detection device is arranged in the furnace of the heating furnace and is used to detect the oxygen content in the furnace.

7. The heating furnace system according to claim 6, characterized in that: The first fan is a variable frequency fan; The heating furnace system also includes a control device, which is connected to the first oxygen content detection device, the second oxygen content detection device, the first fan, the first flow regulating device, the second flow regulating device, the third flow regulating device and the fourth flow regulating device. The control device is used to adjust at least one of the frequency of the first fan, the opening of the first flow regulating device, the opening of the second flow regulating device, the opening of the third flow regulating device and the opening of the fourth flow regulating device according to the detection results of the first oxygen content detection device and / or the second oxygen content detection device.

8. The heating furnace system according to claim 1, characterized in that The heating furnace system also includes a quick-opening damper; The quick-opening damper is communicated with the combustion-supporting gas inlet.

9. The heating furnace system according to any one of claims 1 to 8, characterized in that: The flue gas cooler is a heat exchanger, and the flue gas cooler includes a flue gas flow path and a cooling medium flow path; The flue gas inlet of the flue gas cooler and the flue gas outlet of the flue gas cooler are respectively the inlet of the flue gas flow path and the outlet of the flue gas flow path; The heat exchanger further includes a condensed water outlet, which is communicated with the flue gas flow path.

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