Backflush device for heating furnace, heating furnace system, heating furnace control method

Abstract

The present disclosure provides a heating furnace back-blowing device, a heating furnace system and a heating furnace control method. The heating furnace back-blowing device comprises: a back-blowing pipeline for connecting gas valve ports of a plurality of burners; wherein the plurality of burners are corresponding burners of the heating furnace; a back-blowing valve arranged on the back-blowing pipeline for controlling opening and closing of the back-blowing pipeline; and a back-blowing fan unit arranged on a main pipeline of the back-blowing pipeline for realizing back-blowing of flue gas of one or more burners. The present disclosure can solve the problems of a related art system, such as complexity, high cost and poor stability.

Description

Technical Field

[0001] This disclosure relates to the field of energy conservation and emission reduction technology, and in particular to a backflushing device for a heating furnace, a heating furnace system, and a heating furnace control method. Background Technology

[0002] Blast furnace gas has a much lower calorific value than natural gas. To improve combustion efficiency, gas-fired furnaces in the steel industry typically employ a dual regenerative combustion method using both air and gas. However, furnaces using this regenerative combustion method require frequent reversing (once every 60 seconds), and during this process, gas is often directly drawn into the exhaust pipe and directly discharged. Unburned gas is released directly into the atmosphere, causing environmental pollution and energy waste. To address this issue, a flue gas backflushing device was developed to backflush gas into the furnace. This device requires a high-power induced draft fan, a laser CO analyzer, a laser O2 analyzer, a two-way relief valve, flow, pressure, and temperature detectors, and numerous pneumatic and electric valves, resulting in a complex system, high cost, and poor stability. Summary of the Invention

[0003] This disclosure provides a backflushing device for a heating furnace, a heating furnace system, and a heating furnace control method to solve the problems of complex systems, high costs, and poor stability in related flue gas backflushing devices.

[0004] In a first aspect, embodiments of this disclosure provide a backflushing device for a heating furnace, comprising: A backflush pipe is used to connect the gas valve ports of multiple burners; wherein, the multiple burners are burners corresponding to the heating furnace; A backflush valve is provided on the backflush pipe and is used to control the opening and closing of the backflush pipe; A backflushing fan unit is installed on the main pipe of the backflushing duct and is used to achieve backflushing of flue gas from one or more burners.

[0005] In one exemplary embodiment of this disclosure, the backflush pipe, the backflush valve, and the backflush blower unit each include multiple units, and the backflush pipe, the backflush valve, and the backflush blower unit are arranged in a one-to-one correspondence; Each of the backflush pipes is used to connect the gas valve ports of the first burner and the second burner; the first burner and the second burner are any two burners in the heating furnace.

[0006] In one exemplary embodiment of this disclosure, the first burner and the second burner are disposed on different sides of the heating furnace, and the first burner and the second burner are used in conjunction.

[0007] In one exemplary embodiment of this disclosure, the anti-blowing unit includes two sets of fan blades coaxially mounted with opposite airflow directions, and a motor for driving the fan blades.

[0008] In one exemplary embodiment of this disclosure, the backflush valve is opened when the gas valve ports of the burners on either side of the main backflush pipeline are closed; The backflush valve closes after a preset opening time.

[0009] In an exemplary embodiment of this disclosure, the preset time is: T = t1 + t2 + t3 + t4, where T represents the preset time, t1 represents the time for the gas valve to close, t2 represents the time for the backflush valve to open, t3 represents the time for the flue gas to backflush into the furnace, and t4 represents the reserved safety time. t3=π (1 / 2) D2) 2 L2 / Q1, where D2 represents the diameter of the gas pipeline, L2 represents the distance between the backflush valve and the furnace chamber, and Q1 represents the backflush flue gas flow rate.

[0010] Secondly, embodiments of this disclosure provide a heating furnace system, including the heating furnace backflushing device described in the first aspect.

[0011] Thirdly, embodiments of this disclosure provide a furnace control method applied to the furnace system provided in the second aspect, comprising: When all gas valve ports of the first burner are closed, the backflush valve is opened; the first burner is a burner connected to one side of the main backflush pipeline. After a preset time has elapsed since the backflush valve was opened, the backflush valve is controlled to close. The air valve port of the first burner is closed, and the exhaust pipe of the second burner is closed; the second burner is a burner connected to the other side of the main pipe of the backflush pipe. The air valve and gas valve of the second burner are opened, and the exhaust pipe of the first burner is opened.

[0012] The beneficial effects of the furnace backflushing device, furnace system, and furnace control method provided in this disclosure are as follows: This embodiment of the invention achieves the backflushing function of the heating furnace flue gas by setting up a backflushing pipe connecting the gas valve ports of multiple burners, a backflushing valve on the backflushing pipe, and a backflushing blower unit on the main pipe of the backflushing pipe. When the backflushing valve is opened, the backflushing blower unit starts working, realizing the backflushing of flue gas from one or more burners through the backflushing pipe. The flue gas is used to blow the gas between the gas valve ports and the burners into the heating furnace, which not only solves the environmental pollution problem caused by the direct emission of gas into the atmosphere, but also saves energy.

[0013] Compared with related technologies, the advantages of the embodiments disclosed herein are as follows: 1. The embodiments disclosed herein only require the addition of a low-power back-blowing air blower unit, which requires less and simpler equipment, and the device is simple and has good stability.

[0014] 2. The present invention only requires laying a thinner backflush pipe between the gas valve ports of multiple burners, which reduces the difficulty of pipe laying, greatly shortens the pipe laying distance, and reduces the required cost.

[0015] 3. In this embodiment of the present disclosure, the backflush pipe is directly connected to the gas valve port of multiple burners, so that the backflush flue gas is directly taken from the furnace chamber of the heating furnace, avoiding the safety hazards caused by excessive oxygen content, and at the same time having no impact on the atmosphere inside the heating furnace. Attached Figure Description

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

[0017] Figure 1 This is a schematic diagram of the flue gas backflushing device in the relevant technical solution; Figure 2 This is a schematic diagram of the structure of the backflushing device for the heating furnace provided in the embodiments of this disclosure; Figure 3 This is a schematic diagram of the structure of the back-blowing air blower unit provided in the embodiments of this disclosure; Figure 4 This is a schematic diagram of the main pipe of the backflush pipe provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of the main pipe of the backflush pipe provided in another embodiment of this disclosure; Figure 6 This is a schematic diagram of the main pipe of the backflush pipe provided in another embodiment of this disclosure.

[0018] In the diagram: 11 Burner, 12 Burner, 13 Burner, 14 Flue gas return location, 21 Backflush pipe, 22 Backflush valve, 23 Backflush blower unit, 24 Gas valve port, 25 Air valve port, 26 Exhaust valve port, 27 Gas, 28 Air, 29 Flue gas, 210 Burner, 211 Burner, 31 Main pipe, 41 Motor, 42 Fan blade, 43 Fan blade, 44 Power transmission shaft, 45 Motor sealing bracket, 46 Fan housing, 47 Bracket. Detailed Implementation

[0019] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0020] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0021] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings: Figure 1 This is a structural schematic diagram of a flue gas backflushing device according to a relevant technical solution. (Refer to...) Figure 1 The basic process of the relevant technical solution is to use an induced draft fan to extract the flue gas generated during combustion and send it back to the reversing valves of each combustion section. The backflushing of each three-way valve is controlled by a two-way valve (with a manual butterfly valve). When the combustion of the burner on this side ends, at the same time as the gas side valve plate closes, the two-way valve plate opens, and the flue gas drawn back from the flue gas return position 14 is used to purge the gas in the common pipeline between the original three-way valve and the burner. This part of the gas is then blown into the heating furnace for combustion. At the same time, during the purging process, the air reversing valve on the same side ( Figure 1 (Not shown in the image) The reversal is delayed to ensure the air required for gas combustion, while the burner on the opposite side continues to exhaust smoke normally. After purging, the two-way valve is closed, and the three-way valve exhaust valve plate on this side is opened to enter the exhaust state. At the same time, the burner on the opposite side starts to burn. In this way, the flame of the heating furnace can be continuously and stably maintained during the flue gas backflushing process, ensuring stable production of the heating furnace. Among them, the aforementioned "this side, same side, opposite side" refers to the heating furnace. For example, burner 11 is located on the same side as burner 12, and burner 13 is located on the opposite side of burner 13.

[0022] However, the flue gas backflushing device of the relevant technical solution has the following disadvantages: 1. This flue gas backflushing device requires the addition of a high-power induced draft fan, a laser CO analyzer, a laser O2 analyzer, a two-way relief valve, flow, pressure and temperature detectors, and numerous pneumatic and electric valves to the heating furnace. Therefore, the flue gas backflushing device system is complex, costly, and has poor stability.

[0023] 2. Due to the large diameter of the gas pipeline (500mm~1500mm) and the large number of burners in the heating furnace, the limited space makes pipeline laying very difficult.

[0024] 3. The flue gas backflush device draws back the flue gas from the chimney, making it difficult to control the oxygen content of the backflush flue gas, which can easily cause furnace explosions.

[0025] 4. The flue gas treatment process of the heating furnace (such as desulfurization and denitrification) will make the composition of the backflushing flue gas complex, resulting in an unstable furnace atmosphere and affecting the quality of heat-treated products.

[0026] Firstly, in order to solve the above problems, embodiments of this disclosure provide a backflushing device for a heating furnace. Figure 2 This is a schematic diagram of a backflushing device for a heating furnace provided in an embodiment of this disclosure. (Refer to...) Figure 2 The backflushing device for the heating furnace includes: Backflush pipe 21 is used to connect the gas valve port 24 outlet of multiple burners; wherein, multiple burners are burners corresponding to the heating furnace; wherein, the gas valve port 24 outlet refers to the pipe port connecting the gas valve port and the heating furnace.

[0027] Backflush valve 22 is installed on backflush pipe 21 and is used to control the opening and closing of backflush pipe 21.

[0028] Back-blowing unit 23 is installed on the main pipe 31 of back-blowing pipe 21 and is used to realize flue gas back-blowing of one or more burners.

[0029] The backflushing device for the heating furnace can include one backflushing pipe 21 or multiple backflushing pipes 21. When the backflushing device for the heating furnace includes only one backflushing pipe 21, the gas valve ports of all burners in the heating furnace are connected to this backflushing pipe and are interconnected through this backflushing pipe (some burners are connected to one side of the main backflushing pipe, and other burners are connected to the other side of the main backflushing pipe); when the backflushing device for the heating furnace includes multiple backflushing pipes 21, each backflushing pipe connects to the gas valve ports of two burners in the heating furnace, and the number of backflushing pipes is half the number of burners in the heating furnace.

[0030] In this embodiment of the present disclosure, the main pipe 31 of the backflush pipe 21 is as follows: Figures 4-6As shown, placing the backflush valve and backflush blower unit on the main pipeline ensures the flue gas backflush function of all burners. On this basis, compared with setting backflush valves and backflush blower units on all branch pipelines of the backflush pipeline, the cost and overall size of the equipment are reduced.

[0031] Typically, heating furnaces are equipped with multiple burners. However, the dual regenerative combustion method requires air and gas to be heated separately by the regenerator before entering the furnace chamber for mixed combustion. Therefore, in this embodiment, each burner is provided with two pipes that are connected to the air valve port 25 and the gas valve port 24 respectively. At the same time, in order to ensure the exhaust function of the burner, each pipe is also connected to an exhaust valve port 26. That is, one pipe corresponding to each burner is connected to the gas valve port 24 and the exhaust valve port 26, and the other pipe is connected to the air valve port 25 and the exhaust valve port 26.

[0032] Based on this, this embodiment of the disclosure achieves the backflushing function of the heating furnace flue gas by setting up a backflushing pipe 21 that connects to the gas valve ports 24 outlets of multiple burners, a backflushing valve 22 on the backflushing pipe 21, and a backflushing fan unit 23 on the main pipe of the backflushing pipe 21. When the backflushing valve 22 is opened, the backflushing fan unit 23 starts to work, realizing the backflushing of flue gas from one or more burners through the backflushing pipe 21. At the same time, the backflushing pipe 21 in this embodiment is directly connected to the gas valve ports 24 outlets of multiple burners, so that the backflushing flue gas is directly taken from the furnace chamber of the heating furnace, avoiding the safety hazards caused by excessive oxygen content, and having no impact on the atmosphere inside the heating furnace.

[0033] As can be seen from the above analysis, the embodiments of this disclosure require less equipment, avoid safety hazards caused by excessive oxygen content, and only require laying a thin backflush pipe 21 between the gas valve ports 24 of multiple burners. The pipe laying is easy and the distance is short. Therefore, the embodiments of this disclosure have the advantages of simple structure, good stability, high safety and low cost.

[0034] In one exemplary embodiment of this disclosure, there are multiple backflush pipes 21, backflush valves 22, and backflush blower units 23, and each backflush pipe 21, backflush valve 22, and backflush blower unit 23 is arranged in a one-to-one correspondence; each backflush pipe 21 is used to connect to the gas valve port 24 outlet of the first burner and the second burner; the first burner and the second burner are any two burners in the heating furnace.

[0035] In this embodiment, the backflush pipes 21, backflush valves 22, and backflush blower units 23 are configured in a one-to-one correspondence, meaning that each backflush pipe 21 has a corresponding backflush valve 22 and a backflush blower unit 23 installed on its main pipe 31. When the heating furnace reverses direction, the backflush valve 22 and the backflush blower unit 23 of the corresponding backflush pipe 21 open, ensuring that the corresponding backflush pipes 21 all achieve flue gas backflush function. In this embodiment, each burner corresponds to only one backflush pipe 21, which facilitates the laying of the backflush pipes 21 and simplifies the opening and closing control of all valves in the device. The reason for adopting the solution in this embodiment is that when one burner corresponds to multiple backflush pipes 21, it not only increases the difficulty of laying the backflush pipes 21, but also makes the control of valves in the device more complicated. For example, if the gas valve port 24 of one burner is closed, and the remaining gas in the pipe between the burner and the gas valve port 24 is to be blown into the heating furnace, opening all the corresponding backflush valves 22 may cause gas mixing between the corresponding multiple backflush pipes 21; when only one backflush valve 22 is opened, further analysis and calculation are needed to determine which backflush valve 22 is more effective.

[0036] Meanwhile, since the backflush pipe 21 is directly connected between the gas valve ports 24 of the two burners, the backflush flue gas comes directly from the furnace chamber of the heating furnace, avoiding safety hazards caused by excessive oxygen content, and has no impact on the atmosphere inside the heating furnace.

[0037] In one exemplary embodiment of this disclosure, a first burner and a second burner are disposed on different sides of the heating furnace, and the first burner and the second burner are used in conjunction.

[0038] The combined use of the first and second burners means that when air 28 and gas 27 enter the furnace through the first burner for combustion, the resulting flue gas 29 is discharged through the second burner; conversely, when air 28 and gas 27 enter the furnace through the second burner for combustion, the resulting flue gas 29 is discharged through the first burner. Positioning the first and second burners on opposite sides of the furnace facilitates gas flow. When the first and second burners are on opposite sides, air and gas enter from one burner, while flue gas exits from the other, resulting in a consistent gas flow direction. However, when the first and second burners are on the same side, the entry of air and gas and the exit of flue gas occur on the same side, leading to chaotic gas flow and hindering combustion and exhaust.

[0039] For example, burners 210 and 211 are located on different sides of the heating furnace. Burner 210 is used as the first burner and burner 211 is used as the second burner. The two are used together. That is, when air 28 and gas 27 enter the heating furnace through the first burner for combustion, the flue gas 29 produced by combustion is discharged through the second burner. When air 28 and gas 27 enter the heating furnace through the second burner for combustion, the flue gas 29 produced by combustion is discharged through the first burner.

[0040] Figure 3 This is a schematic diagram of a backflow blower unit provided as an exemplary embodiment of the present disclosure. (Refer to...) Figure 3 The blower unit 23 includes two sets of fan blades mounted coaxially with opposite airflow directions, and a motor 41 for driving the fan blades.

[0041] like Figure 3 As shown, in the back-blowing blower unit, fan blades 42 and 43 are coaxially mounted and have opposite airflow directions. Motor 41 drives the two sets of fan blades to rotate through power transmission shaft 44. Bracket 47 fixes power transmission shaft 44 inside the blower housing 46. Fan blades 42, 43, power transmission shaft 44 and bracket 47 are all installed inside the blower housing 46. Motor sealing bracket 45 fixes motor 41 on the blower housing 46.

[0042] Analysis of this exemplary embodiment shows that the coaxial installation of the two sets of fan blades with opposite airflow directions enables bidirectional switching between forced draft and induced draft, ensuring that the flue gas 29 in both directions is back-blown. This ensures that the flue gas 29 discharged from the second burner can be used to blow the remaining gas 27 in the pipe between the first burner and the corresponding gas valve port 24 into the furnace chamber, and also ensures that the flue gas 29 discharged from the first burner can be used to blow the remaining gas 27 in the pipe between the second burner and the corresponding gas valve port 24 into the furnace chamber.

[0043] Meanwhile, compared with the parallel arrangement of blower and induced draft fan in related technologies, the structure of the back-blowing fan unit 23 in this exemplary embodiment is simpler and the size of the device is reduced.

[0044] In one exemplary embodiment of this disclosure, the backflush valve 22 is opened when the gas valve ports 24 of the burners on either side of the backflush pipeline 21 main pipeline 31 are closed; the backflush valve 22 is closed after a preset opening time.

[0045] In the exemplary embodiments of this disclosure, either side of the main pipe 31 of the backflush pipe 21 refers to either side of the main pipe 31 of the backflush pipe 21 connecting to the gas valve port 24, for example, in Figures 4-6In this context, "any side" of the main backflushing pipe 31 refers to either the upper or lower side of the main backflushing pipe 31 connecting to the gas valve port. The preset time refers to the sum of the gas valve port closing time, the backflushing valve opening time, the flue gas backflushing into the furnace time, and the reserved safety time during the reversing process of the heating furnace. Therefore, the backflushing valve 22 closes after the preset opening time, ensuring that the backflushing valve 22 closes after all remaining gas has been backflushed into the heating furnace, demonstrating the energy-saving and emission-reduction performance of the backflushing device.

[0046] In one exemplary embodiment of this disclosure, the preset time is: T = t1 + t2 + t3 + t4, where T represents the preset time, t1 represents the time for the gas valve port 24 to close, t2 represents the time for the backflush valve 22 to open, t3 represents the time for the flue gas to backflush into the furnace chamber, and t4 represents the reserved safety time.

[0047] t1 and t2 depend on the type of gas valve port 24. Different types of valves have different closing times. For example, electromagnetic pulse valves take about 0.5s, cylinder valve plate quick-cut valves take about 1s, and pneumatic butterfly valves take about 0.5-1s.

[0048] t3 = (1 / 2) D2) 2 L2 / Q1, where D2 represents the diameter of the gas pipeline corresponding to the gas valve port 24, L2 represents the distance between the backflush valve 22 and the furnace chamber of the heating furnace, and Q1 represents the backflush flue gas flow rate.

[0049] t4 represents the reserved safety time, which is generally selected as 1-2 seconds.

[0050] Among them, valve closing action time represents the time required for the valve to change from the open state to the closed state, and valve opening action time represents the time required for the valve to change from the closed state to the open state.

[0051] Analysis of this exemplary embodiment shows that the preset time includes not only the necessary time (the time for the gas valve to close, the time for the backflushing valve to open, and the time for flue gas backflushing), but also a reserved safety time, which further ensures the safety of the heating furnace backflushing device.

[0052] Secondly, embodiments of this disclosure provide a heating furnace system, including the heating furnace backflushing device described in the first aspect.

[0053] In one exemplary embodiment of this disclosure, the heating furnace system further includes a heating furnace.

[0054] Typically, heating furnaces are equipped with multiple burners. However, the dual regenerative combustion method requires air and gas to be heated separately by a regenerator before entering the furnace for mixing and combustion. Therefore, in this embodiment, each burner is equipped with two pipes connecting to an air valve 25 and a gas valve 24 respectively. Simultaneously, to ensure the burner's flue gas exhaust function, each pipe is also connected to an exhaust valve 26. That is, one pipe corresponding to each burner connects to both the gas valve 24 and the exhaust valve 26, while the other pipe connects to both the air valve 25 and the exhaust valve 26. Furthermore, the other ends of the two exhaust valves 26 are connected to a flue gas purification device to ensure the environmental friendliness of the heating furnace system.

[0055] Thirdly, embodiments of this disclosure provide a furnace control method applied to a heating furnace system, including: When all gas valve ports 24 of the first burner are closed, the backflush valve 22 is opened; the first burner is a burner connected to one side of the main pipeline 31 of the backflush pipeline 21. After a preset time has elapsed since the backflush valve 22 was opened, the backflush valve 22 is controlled to close. The air valve port 25 of the first burner is closed, and the flue gas valve port 26 of the second burner is closed; the second burner is a burner connected to the other side of the main pipe 31 of the backflush pipe 21. The air valve port 25 and gas valve port 24 of the second burner are opened, and the flue gas valve port 26 of the first burner is opened.

[0056] When the heating furnace reverses direction, the gas valve port 24 controlling the second burner is closed, and the backflush valve 22 is opened; After a preset time has elapsed since the backflush valve 22 was opened, the backflush valve 22 is controlled to close. The air valve port 25 of the second burner is closed, and the flue gas valve port 26 of the first burner is closed; The air valve port 25 and gas valve port 24 of the first burner are opened, and the flue gas valve port 26 of the second burner is opened.

[0057] In this embodiment, when all gas valve ports 24 of the first burner are closed, the backflush valve 22 is opened, and simultaneously, the motor in the backflush blower unit 23 starts driving the two sets of fan blades to rotate, using the flue gas 29 discharged from the second burner to blow the remaining gas in the pipe between the first burner and its gas valve ports 24 into the furnace chamber; when all gas valve ports 24 of the second burner are closed, the backflush valve 22 is opened, and simultaneously, the motor in the backflush blower unit 23 starts driving the two sets of fan blades to rotate, using the flue gas 29 discharged from the first burner to blow the remaining gas in the pipe between the second burner and its gas valve ports 24 into the furnace chamber. Here, "first side" and "second side" refer to one of the two sides of the furnace where the burners are located, for example, Figure 2 The burner 210 and burner 211 are located on both sides of the burner.

[0058] Analysis of the embodiments of this disclosure shows that when all gas valve ports 24 of the first burner are closed, the backflush valve 22 is activated. The flue gas 29 discharged from the second burner is used to backflush the remaining gas 27 in the pipe between the first burner and the gas valve ports 24 into the furnace chamber. This solves the environmental pollution problem caused by directly discharging the remaining gas 27 into the atmosphere and also enables the reuse of the flue gas 29 discharged from the furnace, saving energy. Furthermore, the backflush flue gas 29 in this embodiment originates directly from the furnace chamber, avoiding safety hazards caused by excessive oxygen content and having no impact on the furnace atmosphere.

[0059] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A backflushing device for a heating furnace, characterized in that, include: A backflush pipe is used to connect the gas valve ports of multiple burners; wherein, the multiple burners are burners corresponding to the heating furnace, and each burner is provided with two pipes, one pipe connecting the gas valve port and the flue gas valve port, and the other pipe connecting the air valve port and the flue gas valve port; A backflush valve is installed on the main pipe of the backflush pipe and is used to control the opening and closing of the backflush pipe; A back-blowing fan unit is installed on the main pipe of the back-blowing duct and is used to achieve back-blowing of flue gas from one or more burners; The backflush pipe, the backflush valve, and the backflush blower unit each include multiple units, and the backflush pipe, the backflush valve, and the backflush blower unit are arranged in a one-to-one correspondence; Each of the backflush pipes is used to connect the gas valve ports of the first burner and the second burner; the first burner and the second burner are any two burners in the heating furnace; The anti-air blower unit includes two sets of fan blades mounted coaxially with opposite airflow directions, and a motor for driving the fan blades; The backflush valve opens when the gas valve ports of the burners on either side of the main backflush pipeline are closed. The backflush valve closes after being opened for a preset time. The preset time is: T = t1 + t2 + t3 + t4, where T represents the preset time, t1 represents the time for the gas valve to close, t2 represents the time for the backflush valve to open, t3 represents the time for the flue gas to backflush into the furnace, and t4 represents the reserved safety time. Where D2 represents the diameter of the gas pipeline corresponding to the gas valve port, L2 represents the distance between the backflush valve and the furnace chamber, and Q1 represents the backflush flue gas flow rate.

2. The furnace backflushing device as described in claim 1, characterized in that, The first burner and the second burner are located on different sides of the heating furnace, and the first burner and the second burner are used in conjunction.

3. A heating furnace system, characterized in that, include: The backflushing apparatus for a heating furnace as described in any one of claims 1 to 2.

4. A furnace control method applied to the furnace system as described in claim 3, characterized in that, include: When all gas valve ports of the first burner are closed, the backflush valve is opened; the first burner is a burner connected to one side of the main backflush pipeline. After a preset time has elapsed since the backflush valve was opened, the backflush valve is controlled to close. The air valve port of the first burner is closed, and the exhaust valve port of the second burner is closed; the second burner is a burner connected to the other side of the main backflush pipe. The air valve and gas valve of the second burner are opened, and the exhaust valve of the first burner is opened.

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