Dry quenching furnace supplementary air preheating device and method

Abstract

The invention relates to the technical field of dry quenching, in particular to a dry quenching furnace supplementary air preheating device and method. Comprising an air dehumidification unit, an air leading-in unit, an air heat exchange unit and an air output unit. The air dehumidification unit is provided with an air humidity detector, a dehumidifier and a dehumidification pipe, the air lead-in unit is provided with an air lead-in pipe, the air heat exchange unit is provided with a heat exchange pipe, and the air output unit is provided with an air output pipe; the air humidity detector and the dehumidification pipe are sequentially installed at the air inlet end of the air guide-in pipe, and the dehumidifier is installed on the dehumidification pipe. The heat exchange pipe is arranged in an area between a furnace body of the dry quenching furnace and the primary dust remover, one end of the heat exchange pipe is connected with the air ingress pipe, and the other end of the heat exchange pipe is connected with the air output pipe; and the air output pipe is connected with the dry quenching annular air duct. The waste heat of the dry quenching furnace is used for preheating air needing to be supplemented in the running process of the dry quenching furnace, the running stability of the dry quenching furnace is improved, and the service life of the dry quenching furnace is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of coke dry quenching, and particularly to a device and method for preheating supplementary air in a coke dry quenching furnace. Background Art

[0002] The coke dry quenching technology is one of the key promoted technologies for realizing circular economy and green development in the new generation of iron and steel manufacturing processes. Coke dry quenching is superior to wet coke quenching in terms of energy conservation, environmental protection and improvement of coke quality. In recent years, China's coke production has continued to maintain above 460 million tons, accounting for more than 68% of the world's coke production. Coupled with the intensive adoption of the full coke dry quenching technology, it is conservatively estimated that more than 450 coke dry quenching devices need to be supported. The efficient operation of coke dry quenching has become a common understanding and effort direction in the coking industry.

[0003] Coke dry quenching, relative to wet coke quenching, refers to a coke quenching method that uses an inert gas to cool down the red-hot coke. In the process of coke dry quenching, the red-hot coke is charged from the top of the coke dry quenching furnace, and the low-temperature inert gas is blown into the red-hot coke layer in the cooling section of the coke dry quenching furnace by a circulation fan to absorb the sensible heat of the red-hot coke. The cooled coke is discharged from the bottom of the coke dry quenching furnace. The high-temperature inert gas (up to 900 - 960 °C) coming out of the annular flue of the coke dry quenching furnace flows through the coke dry quenching boiler for heat exchange, and the boiler generates steam. The cooled inert gas (about 130 °C) is re-blown into the coke dry quenching furnace by the circulation fan, and the inert gas is recycled in a closed system.

[0004] During the operation of the coke dry quenching furnace, 100% sealing operation cannot be achieved. The inert gas is consumed during the recycling process, and inert gas needs to be supplemented. At the same time, the coke dry quenching circulating gas contains components such as CO, H2, CO2, and CH4. To prevent the concentration of combustible components from being too high and causing an explosion, an inert gas needs to be introduced to dilute the combustible components in the circulating gas. As an industrial furnace kiln, the coke dry quenching furnace normally uses the method of supplementing and introducing air to meet the above technical requirements. The main components in the coke dry quenching furnace are refractory structures, coke, and the circulating gas are all operating at high temperatures, while the supplemented and introduced air is at room temperature, which is bound to cause an impact on the refractories in the coke dry quenching furnace and increase the fluctuation of the temperature field of the coke dry quenching operating gas, which is not conducive to the efficient and stable operation of coke dry quenching. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a device and method for preheating supplementary air in a coke dry quenching furnace, which uses the waste heat of the coke dry quenching furnace to preheat the supplementary air required during the operation of the coke dry quenching furnace, improves the operation stability of coke dry quenching, and is conducive to the long life of coke dry quenching.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A supplementary air preheating device for a coke dry quenching furnace, comprising an air dehumidification unit, an air inlet unit, an air heat exchange unit and an air outlet unit; the air dehumidification unit is provided with an air humidity detector, a dehumidifier and a dehumidification pipe, the air inlet unit is provided with an air inlet pipe, the air heat exchange unit is provided with a heat exchange pipe, and the air outlet unit is provided with an air outlet pipe; the air humidity detector and the dehumidification pipe are sequentially installed at the air inlet end of the air inlet pipe, and the dehumidifier is installed on the dehumidification pipe; the heat exchange pipe is arranged in the area between the furnace body of the coke dry quenching furnace and the primary dust collector, one end of the heat exchange pipe is connected to the air inlet pipe, and the other end is connected to the air outlet pipe; the air outlet pipe is connected to the coke dry quenching annular air duct.

[0008] Further, the air inlet unit further includes a second intake valve, a booster fan, a flowmeter and a first flow control valve; the second intake valve, the booster fan, the flowmeter and the first flow control valve are sequentially installed on the air inlet pipe.

[0009] Further, the air dehumidification unit further includes a first intake valve and a first outlet valve, the dehumidification pipe is in a U shape and consists of a first vertical pipe, a horizontal pipe and a second vertical pipe, the first vertical pipe and the second vertical pipe are fixedly connected to both sides of the second intake valve, the first intake valve is installed on the first vertical pipe, the first outlet valve is installed on the second vertical pipe, and the dehumidifier is installed on the horizontal pipe; the first intake valve and the first outlet valve adopt an interlocking control mode and open and close simultaneously.

[0010] Further, it further includes a filter screen, and the filter screen is installed at the air inlet of the air inlet pipe.

[0011] Further, the dehumidifier uses silica gel desiccant.

[0012] Further, the air heat exchange unit further includes an intake switch and an outlet switch; the intake switch is installed at the connection between the air inlet pipe and the heat exchange pipe, and the outlet switch is installed at the connection between the air outlet pipe and the heat exchange pipe.

[0013] Further, the air outlet unit further includes a temperature detection device, a second flow control valve, an air relief valve and a stop gate; the temperature detection device, the second flow control valve, the air relief valve and the stop gate are sequentially installed on the air outlet pipe.

[0014] Further, the heat exchange pipe is of a pipe structure and adopts a multi-pipe parallel structure, and is installed between the iron sheet layer of the coke dry quenching furnace and the refractory material layer of the coke dry quenching furnace.

[0015] Further, the diameter of the heat exchange pipe is less than or equal to 150 mm.

[0016] A method for preheating supplementary air in a coke dry quenching furnace is realized by using the above-mentioned supplementary air preheating device for a coke dry quenching furnace, and specifically includes the following steps:

[0017] 1) The air humidity detector detects the air humidity. If the absolute humidity ≤ 25 g / m under the condition of 20 °C 3 , close the air release valve, close the first intake valve, open the second intake valve, and open the stop gate;

[0018] 2) Under the operating state of the coke dry quenching, start the pressurizing fan to suck air into the air inlet pipe. After passing through the air humidity detector, it passes through the second intake valve, and then is transported through the air inlet pipe to the intake switch, reaching multiple parallel heat exchange tubes. The introduced air indirectly exchanges heat with the high-temperature circulating gas of the coke dry quenching through the heat exchange tubes; the preheated air after heat exchange enters the annular air duct of the coke dry quenching furnace through the air outlet pipe, the outlet switch, the temperature detection device, the second flow control valve, and the stop gate to supplement the circulating gas;

[0019] 3) The air humidity detector detects the air humidity. If the absolute humidity > 25 g / m under the condition of 20 °C 3 , close the air release valve, close the second intake valve, open the first intake valve, open the first outlet valve, and open the stop gate;

[0020] 4) Under the operating state of the coke dry quenching, start the pressurizing fan to suck air into the air inlet pipe. After passing through the air humidity detector, it passes through the first intake valve, passes through the dryer, passes through the first outlet valve, and then is transported through the air inlet pipe to the intake switch, and reaches multiple parallel heat exchange tubes through the air inlet pipe. The introduced air indirectly exchanges heat with the high-temperature circulating gas of the coke dry quenching through the heat exchange tubes; the preheated air after heat exchange enters the annular air duct of the coke dry quenching furnace through the air outlet pipe, the outlet switch, the temperature detection device, the second flow control valve, and the stop gate to supplement the circulating gas;

[0021] 5) Detect the temperature of the preheated air through the temperature detection device. If the temperature of the preheated air is higher than 150 °C, then reduce the first flow control valve, the intake switch, the outlet switch, and the second flow control valve;

[0022] 6) When the coke dry quenching furnace supplementary air preheating device is under maintenance or abnormal operation, open the air release valve and close the stop gate.

[0023] Compared with the existing method, the beneficial effects of the present invention are:

[0024] Starting from ensuring the efficient operation of coke dry quenching, in view of the actual problem that air needs to be supplemented during the operation of coke dry quenching, and the temperature of the supplemented air is significantly lower than the operating environment temperature of the coke dry quenching furnace, which is likely to affect the refractories of the coke dry quenching furnace and the temperature stability of the circulating gas. In the primary deduster section of the furnace body of the coke dry quenching furnace, the present invention realizes the preheating of the air to be supplemented during the operation of the coke dry quenching furnace by adding an air heat exchange unit to utilize the high-temperature circulating gas flowing through this area. By adding an air dehumidification unit, the humidity of the supplemented air is detected in real time, and the humidity of the supplemented air is adjusted according to the detection results to reduce the disturbance of the gas water content to the flow of the circulating gas in the coke dry quenching furnace.

[0025] The application of the device and method of the present invention can stabilize the humidity of the supplemented air, increase the temperature of the supplemented air in the coke dry quenching furnace, reduce the disturbance of the airflow caused by the change of environmental humidity of the supplemented air, reduce the impact of the temperature of the supplemented air on the refractories of the coke dry quenching furnace, improve the operation stability of coke dry quenching, enhance the operation control efficiency of coke dry quenching, and contribute to the long life of coke dry quenching. Brief Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the installation position of the present invention.

[0028] Figure 3 It is a schematic structural diagram of the heat exchange tube of the present invention.

[0029] In the figure: 1, air inlet pipe; 2, pressure blower; 3, flowmeter; 4, first flow control valve; 5, intake switch; 6, heat exchange tube; 7, outlet switch; 8, temperature detection device; 9, second flow control valve; 10, air relief valve; 11, stop gate; 12, air output pipe; 13, annular air duct of coke dry quenching furnace; 14, pre-storage section; 15, cooling section; 16, coke discharging port; 17, primary deduster; 18, iron sheet layer of coke dry quenching furnace; 19, refractory layer of coke dry quenching furnace; 20, air humidity detector; 21, first intake valve, 22, second intake valve, 23, dehumidifier, 24, first outlet valve. Detailed Description of the Invention

[0030] Embodiments of the present invention will be described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the description of the present invention, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings and thus should not be construed as limiting the scope of protection of the present invention.

[0036] Taking the 140t / h coke dry quenching furnace of a 6-meter top-loading coke oven serving an annual coke production of 1.1 million tons as an example:

[0037] As Figures 1 - 3 shown, a supplementary air preheating device for a coke dry quenching furnace includes an air dehumidifying unit, an air introducing unit, an air heat exchange unit, and an air output unit that are connected in sequence by pipes from left to right.

[0038] The air introducing unit includes a second intake valve 22, an air introducing pipe 1, a pressurizing fan 2, a flowmeter 3, and a first flow control valve 4. In this embodiment, the second intake valve 22, the pressurizing fan 2, the flowmeter 3, and the first flow control valve 4 are installed on the air introducing pipe 1 in sequence from left to right. A metal filter screen is provided at the intake port at the left end of the air introducing pipe 1, and the intake port at the left end of the air introducing pipe 1 is connected to the supplementary air pipeline.

[0039] The air supply capacity of the pressurizing fan of the air introducing unit, the diameter of the air introducing pipe, the flow measurement range, etc. can all reach 15% - 45% of the total amount of the circulating gas per unit of the supported coke dry quenching furnace.

[0040] The air dehumidification unit includes a dehumidification pipe, an air humidity detector 20, a first intake valve 21, a dehumidifier 23, and a first outlet valve 24. The dehumidification pipe is U-shaped and consists of a first vertical pipe, a horizontal pipe, and a second vertical pipe. The first vertical pipe and the second vertical pipe are fixedly connected to the left and right sides of the second intake valve 22. The first intake valve 21 is installed on the left first vertical pipe, the first outlet valve 24 is installed on the right second vertical pipe, and the dehumidifier 23 is installed on the horizontal pipe. The dehumidifier 23 uses a silica gel-based dehumidifying agent. The first intake valve 21 and the first outlet valve 24 adopt an interlocking control mode and open and close simultaneously.

[0041] The air heat exchange unit includes an intake switch 5, a heat exchange pipe 6, and an outlet switch 7. The intake switch 5 and the outlet switch 7 are installed at the left and right ends of the heat exchange pipe 6. The intake switch 5 is installed at the connection between the left end of the heat exchange pipe 6 and the right end of the air inlet pipe 1. The introduced air passes through the air inlet pipe 1, passes through the flange structure, and then reaches the heat exchange pipe 6 through the intake switch 5. The outlet switch 7 is installed at the connection between the right end of the heat exchange pipe 6 and the left end of the air outlet pipe 12. The preheated air after heat exchange passes through the outlet switch 7 and then reaches the air output unit through the air outlet pipe 12 with a flange structure.

[0042] The air output unit includes a temperature detection device 8, a second flow control valve 9, an air release valve 10, a stop gate 11, and an air outlet pipe 12. The temperature detection device 8, the second flow control valve 9, the air release valve 10, and the stop gate 11 are installed on the air outlet pipe 12 from left to right in sequence. The right end of the air outlet pipe 12 is connected to the annular air duct 13 of the coke dry quenching furnace through a flange structure. A stop gate 11 is provided before the preheated air enters the coke dry quenching furnace through the air outlet pipe 12.

[0043] The maximum measured temperature value of the temperature detection device is not lower than 500 °C, the temperature measurement accuracy is ±3 °C, and the error does not exceed this range.

[0044] As Figure 2 、 Figure 3 shown, the upper part of the coke dry quenching furnace is a pre-storage section 14, the middle part is provided with an annular air duct 13, the lower part is a cooling section 15, the bottom is provided with a coke discharging port 16, and the right side is a primary dust collector 17. The heat exchange pipe 6 is arranged in the area between the furnace body of the coke dry quenching furnace and the primary dust collector 17. The heat exchange pipe 6 is of a pipe type structure, adopts a multi-pipe parallel structure, and is installed between the iron sheet layer 18 and the refractory material layer 19 of the coke dry quenching furnace. The diameter of the heat exchange pipe is less than or equal to 150 mm.

[0045] A method for preheating supplementary air in a coke dry quenching furnace is realized by using the above-mentioned coke dry quenching furnace supplementary air preheating device, and specifically includes the following steps:

[0046] 1) Before installing the supplementary air preheating device for the coke dry quenching furnace, calculate the equipment structure parameters of the pressurized blower 2, the air inlet pipe 1, and the air outlet pipe 12 according to the parameters such as the air volume of the coke dry quenching supported, and the designed maximum value is not less than 110% of the normal calculated use value.

[0047] 2) According to the measurement results of the air humidity detector, if the measured humidity result ≤ 25 g / m 3 (absolute humidity under the condition of 20 °C), close the air discharge valve 10, close the first intake valve 21, open the second intake valve 22, and open the stop gate 11.

[0048] According to the measurement results of the air humidity detector, if the measured humidity result > 25 g / m 3 (absolute humidity under the condition of 20 °C), close the air discharge valve 10, close the second intake valve 21, open the first intake valve 22, open the first outlet valve 24, and open the stop gate 11.

[0049] 3) Under the operating state of the coke dry quenching, start the pressurized blower 2, suck air into the air inlet pipe 1, transport it through the air inlet pipe 1 to the intake switch 5, reach the multiple parallel heat exchange tubes 6, and introduce the air to indirectly exchange heat with the high-temperature circulating gas of the coke dry quenching through the heat exchange tubes 6.

[0050] 4) The preheated air after heat exchange enters the annular air duct 13 of the coke dry quenching furnace through the air outlet pipe 12, the outlet switch 7, the temperature detection device 9, the second flow control valve 9, and the stop gate 11 to supplement the circulating gas.

[0051] 5) Detect the temperature of the preheated air through the temperature detection device 8. If the temperature of the preheated air is higher than 150 °C, then reduce the first flow control valve 4, the intake switch 5, the outlet switch 7, and the second flow control valve 9.

[0052] 6) When the inspection, repair or operation of the supplementary air preheating device for the coke dry quenching furnace is abnormal, open the air discharge valve 10 and close the stop gate 11.

[0053] The application of the device and method of the present invention can increase the temperature of the supplementary air for the coke dry quenching furnace, reduce the impact of the supplementary air on the refractories of the coke dry quenching furnace, improve the operation control efficiency of the coke dry quenching, enhance the operation stability of the coke dry quenching, and contribute to the long life of the coke dry quenching.

[0054] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A supplementary air preheating device for a dry quenching coke oven, characterized in that: It includes an air dehumidification unit, an air introduction unit, an air heat exchange unit and an air output unit; The air dehumidification unit is provided with an air humidity detector, a dehumidifier and a dehumidification pipe, the air introduction unit is provided with an air introduction pipe, the air heat exchange unit is provided with a heat exchange pipe, and the air output unit is provided with an air output pipe; The air humidity detector and the dehumidification pipe are sequentially installed at the air inlet end of the air introduction pipe, and the dehumidifier is installed on the dehumidification pipe; The heat exchange tube is arranged in the area between the dry coke quenching furnace body and the primary dust collector, one end of the heat exchange tube is connected to the air inlet pipe, and the other end is connected to the air outlet pipe; the air outlet pipe is connected to the dry coke quenching annular air duct.

2. A dry quenching coke oven supplementary air preheating device according to claim 1, characterized in that: The air introduction unit also includes a second air intake valve, a pressure fan, a flow meter and a first flow control valve; the second air intake valve, the pressure fan, the flow meter and the first flow control valve are installed in the air introduction pipe in sequence.

3. A dry quenching coke oven supplementary air preheating device according to claim 2, characterized in that: The air dehumidification unit also includes a first air inlet valve and a first air outlet valve. The dehumidification pipe is in a U-shape and consists of a first vertical pipe, a horizontal pipe and a second vertical pipe. The first vertical pipe and the second vertical pipe are fixedly connected to both sides of the second air inlet valve. The first air inlet valve is installed on the first vertical pipe, the first air outlet valve is installed on the second vertical pipe, and the dehumidifier is installed on the horizontal pipe; the first air inlet valve and the first air outlet valve adopt an interlocking control mode and are opened and closed at the same time.

4. A dry quenching coke oven supplementary air preheating device according to claim 2, characterized in that: The utility model also comprises a filter screen, which is installed at the air inlet of the air introduction pipe.

5. A dry quenching coke oven supplementary air preheating device according to claim 2, characterized in that: The dehumidifier adopts silica gel dehumidifier.

6. A dry quenching coke oven supplementary air preheating device according to claim 1, characterized in that: The air heat exchange unit also includes an air inlet switch and an air outlet switch; the air inlet switch is installed at the connection between the air inlet pipe and the heat exchange pipe, and the air outlet switch is installed at the connection between the air output pipe and the heat exchange pipe.

7. The dry quenching coke oven supplementary air preheating device according to claim 1, characterized in that: The air output unit further comprises a temperature detection device, a second flow control valve, an air release valve and a stop gate; the temperature detection device, the second flow control valve, the air release valve and the stop gate are sequentially installed on the air output pipe.

8. The dry quenching coke oven supplementary air preheating device according to claim 1, characterized in that: The heat exchange tube is a tube-type structure, adopts a multi-tube parallel structure, and is installed between the dry quenching coke oven iron sheet layer and the dry quenching coke oven refractory material layer.

9. The device for preheating supplementary air for dry quenching coke oven according to claim 1, characterized in that: The diameter of the heat exchange tube is less than or equal to 150 mm.

10. A method for preheating supplementary air for a dry quenching coke oven, implemented by using a device for preheating supplementary air for a dry quenching coke oven as claimed in any one of claims 1 to 9, characterized in that: The specific steps include: 1) The air humidity detector detects the air humidity. If the absolute humidity is ≤25g / m at 20℃ 3 , close the air release valve, close the first air inlet valve, open the second air inlet valve, and open the stop gate; 2) When the CDQ is in operation, the pressurized fan is started to draw air into the air inlet pipe, pass through the air humidity detector and then pass through the second air inlet valve, and then be transported to the air inlet switch through the air inlet pipe to reach multiple heat exchange pipes connected in parallel. The introduced air is indirectly heat exchanged with the CDQ high-temperature circulating gas through the heat exchange pipe; the preheated air after heat exchange passes through the air output pipe, the outlet switch, the temperature detection device, the second flow control valve, and the stop gate to enter the CDQ oven annular air duct to supplement the circulating gas; 3) Air humidity detector detects air humidity. If the absolute humidity is greater than 25g / m at 20°C, 3 , close the air release valve, close the second air inlet valve, open the first air inlet valve, open the first air outlet valve, and open the stop gate; 4) When the CDQ is in operation, start the booster fan to suck air into the air inlet pipe, pass through the air humidity detector, pass through the first air inlet valve, pass through the dryer, pass through the first air outlet valve, and then be transported to the air inlet switch through the air inlet pipe, and then to the multiple heat exchange pipes connected in parallel. The introduced air is indirectly heat exchanged with the CDQ high-temperature circulating gas through the heat exchange pipe; the preheated air after heat exchange enters the CDQ annular air duct through the air outlet pipe, passes through the air outlet switch, the temperature detection device, the second flow control valve, and the stop gate to supplement the circulating gas; 5) Detect the temperature of the preheated air by the temperature detection device. If the preheated air temperature is higher than 150°C, reduce the first flow control valve, the air inlet switch, the air outlet switch and the second flow control valve; 6) When the air preheating device of several coke quenching ovens is under inspection and maintenance or when abnormalities occur during operation, open the air release valve and close the stop gate.

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