Dry quenching system

Abstract

The embodiment of the utility model provides a dry quenching system which comprises a gas channel, and a dry quenching furnace, a primary dust remover, a boiler, a secondary dust remover, a circulating fan, a heat exchanger and a flue gas hygrograph which are sequentially communicated through the gas channel, and the flue gas hygrograph is arranged between a gas outlet of the boiler and a first gas inlet of the dry quenching furnace. And the flue gas hygrometer is used for detecting the humidity of circulating gas in the gas channel. According to the embodiment of the invention, an operator can timely judge whether the boiler bursts or not according to the numerical value of the flue gas hygrometer, so that the dry quenching system is shut down, and the boiler is timely maintained.

Description

Technical Field

[0001] This application relates to the technical field of coke dry quenching, and particularly to a coke dry quenching system. Background Art

[0002] Coke dry quenching technology has been widely applied by enterprises because it is superior to wet coke quenching in terms of energy conservation, environmental protection, and improving coke quality. The circulating gas in coke dry quenching contains a certain amount of coke powder, which will cause wear on the boiler tubes; the circulating gas also contains a small amount of acidic gas, which will cause corrosion to the boiler tubes; and improper operation by operators, etc. All these reasons may lead to damage to the boiler tubes and may cause boiler tube explosion. If the boiler tube explosion cannot be detected in time, it will affect the normal operation of the coke dry quenching system and may even cause serious accidents. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide a coke dry quenching system that can monitor the humidity of the circulating gas in real time, enabling operators to timely judge whether the boiler has exploded based on the humidity value, and then stop the furnace of the coke dry quenching system and repair the boiler in time. The specific technical solutions are as follows:

[0004] The embodiments of this application provide a coke dry quenching system, which includes: a gas passage, and a coke dry quenching furnace, a primary dust collector, a boiler, a secondary dust collector, a circulating fan, a heat exchanger, and a flue gas humidity meter that are sequentially connected through the gas passage. The flue gas humidity meter is arranged between the outlet of the boiler and the first inlet of the coke dry quenching furnace, and the flue gas humidity meter is used to detect the humidity of the circulating gas in the gas passage.

[0005] In some embodiments, the flue gas humidity meter is arranged between the outlet of the boiler and the inlet of the secondary dust collector.

[0006] In some embodiments, the flue gas humidity meter is arranged between the outlet of the secondary dust collector and the inlet of the circulating fan.

[0007] In some embodiments, the flue gas humidity meter is arranged between the outlet of the heat exchanger and the first inlet of the coke dry quenching furnace.

[0008] In some embodiments, the flue gas humidity meter is an on-line resistance-capacitance type flue gas humidity meter.

[0009] In some embodiments, the coke dry quenching system further includes a first relief valve, a second relief valve, and a third relief valve. The coke dry quenching furnace includes a pre-storage chamber. The first relief valve is connected to the pre-storage chamber; the second relief valve is connected to the primary dust collector; the third relief valve is connected to the heat exchanger.

[0010] In some embodiments, the gas channel further includes a first gas outlet channel, a second gas outlet channel, and a third gas outlet channel. The heat exchanger includes a first gas outlet and a second gas outlet. The dry quenching furnace includes a first gas inlet. The first gas outlet of the heat exchanger is communicated with the first gas inlet of the dry quenching furnace through the first gas outlet channel. The third gas outlet channel is arranged between the gas outlet of the dry quenching furnace and the gas inlet of the primary dust collector. The second gas outlet is communicated with the gas inlet of the third gas outlet channel through the second gas outlet channel. A bypass valve is arranged on the second gas outlet channel to control the on-off of the gas in the second gas outlet channel.

[0011] In some embodiments, an adjusting flap is arranged on the first gas outlet channel to adjust the gas distribution amount entering the dry quenching furnace from the first gas outlet of the heat exchanger.

[0012] In some embodiments, a air distribution device is arranged at the lower part of the dry quenching furnace.

[0013] In some embodiments, the dry coke quenching system further includes an air input channel. The dry quenching furnace further includes a second gas inlet. The air input channel is communicated with the second gas inlet of the dry quenching furnace to introduce air into the dry quenching furnace.

[0014] The dry coke quenching system provided by the embodiments of the present application, the dry quenching furnace, the primary dust collector, the boiler, the secondary dust collector, the circulating fan, and the heat exchanger are communicated through the gas channel. Under the action of the circulating fan, the high-temperature gas with coke particles and coke powder discharged from the dry quenching furnace sequentially passes through dust removal by the primary dust collector, heat exchange by the boiler, re-dust removal by the secondary dust collector, and cooling by the heat exchanger, and then enters the dry quenching furnace again to cool the red-hot coke. The flue gas humidity meter is arranged between the gas outlet of the boiler and the first gas inlet of the dry quenching furnace, and can detect the humidity of the circulating gas discharged from the gas outlet of the boiler. When the boiler bursts a pipe, the water in the furnace pipe enters the dry coke quenching system, and the humidity of the circulating gas increases significantly. At this time, the flue gas humidity meter can timely detect the humidity of the circulating gas in the gas channel, making the gas humidity visual. The operator can timely judge whether the boiler bursts a pipe according to the value of the flue gas humidity meter, and then stop the dry coke quenching system, and then timely repair the boiler.

[0015] Of course, it is not necessary for any product implementing the present application to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0017] Figure 1 Schematic diagram of the coke dry quenching system provided by the embodiment of the present application.

[0018] Reference numerals:

[0019] Coke dry quenching furnace 10; First air inlet 11; Air distribution device 12; Coke discharging device 13; Coke transferring device 14; Charging device 15; Primary dust collector 20; Boiler 30; Outlet of the boiler 31; Circulation fan 40; Heat exchanger 50; First outlet 501; Second outlet 502; First relief valve 61; Second relief valve 62; Third relief valve 63; First relief channel 71; Second relief channel 72; Main channel 721; Bypass channel 722; First manual valve 7221; First air outlet channel 73; Adjusting flap 731; Second air outlet channel 74; Bypass valve 741; Third air outlet channel 75; Air input channel 76; First pipeline 77; Second pipeline 78; Air inlet valve 761; Secondary dust collector 80; Inlet of the secondary dust collector 81; Flue gas humidity meter 90. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0021] Coke dry quenching (CDQ) is a process of using inert gas as the circulating gas to directly contact and exchange heat with the hot red coke in the coke dry quenching furnace, thereby extinguishing the red coke. The 950°C - 1050°C red coke pushed out from the coke oven carbonization chamber is transported and lifted, and finally loaded into the coke dry quenching furnace. The red-hot coke exchanges heat countercurrently with the inert gas in the coke dry quenching furnace, and the temperature drops below 200°C and is discharged from the bottom of the coke dry quenching furnace. The hot circulating gas discharged from the coke dry quenching furnace enters the coke dry quenching boiler for heat exchange after being dust-removed by the primary dust collector, and the temperature drops to 160°C - 180°C. The cold circulating gas coming out of the boiler enters the coke dry quenching furnace for recycling after being dust-removed by the secondary dust collector, pressurized by the circulation fan, and cooled to about 130°C by the heat exchanger.

[0022] To ensure the safety of the operation of the gas circulation system of the coke dry quenching device, it is necessary to effectively control the content of combustible components in the circulating gas. To monitor the change of the content of combustible components in the coke dry quenching circulation system, an on-line gas analyzer is generally installed on the pipeline between the outlet of the heat exchanger and the inlet of the coke dry quenching furnace to detect the content of CO2, CO, H2, and O2 in the circulating gas entering the coke dry quenching furnace in real time.

[0023] Sources of H2 in the circulating gas: First, the release of residual volatile components in the red coke, with H2 accounting for 90% and CO accounting for 10% in the residual volatile components; second, the water-gas reaction between water vapor and red-hot coke in the circulation system to generate H2.

[0024] After a boiler tube burst, a large amount of water vapor enters the coke dry quenching system. The water vapor and red-hot coke undergo a water-gas reaction to generate CO and H2, which will cause an increase in the contents of CO and H2 in the circulating gas, especially a sharp increase in the H2 content, resulting in a significant increase in the combustible components in the coke dry quenching system. When the combustible components are too high, an explosion may occur in the coke dry quenching system, specifically manifested as an explosion at the coke dry quenching furnace mouth, annular air duct, etc. However, the prior art has at least the following problems: Although the sharp increase in the H2 content due to the intense water-gas reaction in the coke dry quenching furnace after a boiler tube burst can be detected by an on-line gas analyzer, this method is an indirect detection. The analysis of the gas components by the gas analyzer is relatively lagging, and when the gas analysis fails and the gas components cannot be accurately analyzed, it is impossible to timely and accurately judge whether the boiler has a tube burst, and it is easy to miss the best opportunity to handle unexpected situations.

[0025] The embodiment of the present application provides a coke dry quenching system, as Figure 1 shown, the coke dry quenching system includes: a gas passage, and a coke dry quenching furnace 10, a primary dust collector 20, a boiler 30, a secondary dust collector 80, a circulation fan 40, a heat exchanger 50, and a flue gas humidity meter 90 that are sequentially connected through the gas passage. The flue gas humidity meter 90 is arranged between the outlet 31 of the boiler and the first inlet 11 of the coke dry quenching furnace 10, and the flue gas humidity meter 90 is used to detect the humidity of the circulating gas in the gas passage.

[0026] In the embodiment of the present application, along the flow direction of the circulating gas, the coke dry quenching furnace 10, the primary dust collector 20, the boiler 30, the secondary dust collector 80, the circulating fan 40, and the heat exchanger 50 are sequentially connected through a gas passage. Under the action of the circulating fan 40, the high-temperature circulating gas with coke particles and coke powder discharged from the coke dry quenching furnace 10 sequentially passes through dust removal by the primary dust collector 20, heat exchange by the boiler 30, re-dust removal by the secondary dust collector 80, and cooling by the heat exchanger 50, and enters the coke dry quenching furnace 10 through the first air inlet 11 of the coke dry quenching furnace 10 to cool the red-hot coke. The flue gas humidity meter 90 is arranged between the outlet 31 of the boiler and the first air inlet 11 of the coke dry quenching furnace 10, and can timely and real-time detect the humidity of the circulating gas discharged from the outlet of the boiler 30. When the boiler 30 bursts a pipe, the water in the furnace pipe enters the coke dry quenching system, and the humidity of the circulating gas significantly increases. At this time, the flue gas humidity meter 90 can timely detect the humidity of the circulating gas in the gas passage, making the gas humidity visual. The operator can timely judge whether the boiler 30 bursts a pipe according to the value of the flue gas humidity meter 90, and then timely repair the boiler 30. The setting of the flue gas humidity meter 90 can monitor the humidity of the circulating gas in the coke dry quenching system in real time, timely detect the boiler pipe burst, and then stop the furnace of the coke dry quenching system, reduce the occurrence of secondary risks, and improve the reliability of the operation of the coke dry quenching system.

[0027] Specifically, the heat exchanger 50 is a heat pipe heat exchanger or can also be a feed water preheater, which exchanges heat between the boiler feed water and the circulating gas to reduce the temperature of the circulating gas entering the coke dry quenching furnace, thereby strengthening the heat exchange effect of the coke dry quenching furnace.

[0028] More specifically, the coke dry quenching system further includes a red coke transportation device (not shown in the figure), a coke discharging device 13, a coke transferring device 14, and a charging device 15. The red coke at 950 - 1050 °C pushed out from the coke oven carbonization chamber is transported and lifted by the red coke transportation device, and is loaded into the coke dry quenching furnace 10 through the charging device 15 for cooling. The red-hot coke exchanges heat with the inert gas in the coke dry quenching furnace 10 in a countercurrent manner, and the temperature drops below 200 °C, and is discharged from the coke discharging port at the bottom of the coke dry quenching furnace. The coke discharging device 13 is connected to the coke discharging port of the coke dry quenching furnace 10. After the cooled coke is discharged through the coke discharging device 13, the coke is transferred by the coke transferring device 14.

[0029] In some embodiments of the present application, the flue gas humidity meter 90 is arranged between the outlet 31 of the boiler and the inlet 81 of the secondary dust collector. In the embodiment of the present application, the flue gas humidity meter 90 can directly measure the humidity in the circulating gas discharged from the outlet of the boiler 30, and the measurement result is more accurate. However, because the dust concentration in the circulating gas discharged from the outlet of the boiler 30 is relatively large (dust concentration 10 - 20 g / m 3 )), the selection of the flue gas humidity meter 90 must consider high wear resistance.

[0030] In some embodiments of the present application, such as Figure 1As shown in the figure, the flue gas humidity meter 90 is arranged between the outlet of the secondary dust collector 80 and the inlet of the circulation fan 40. In the embodiment of the present application, the flue gas humidity meter 90 detects the humidity of the circulating gas discharged from the outlet of the secondary dust collector 80. When the detected value is higher than the normal humidity value in the circulating gas, it indicates that the boiler 30 has burst a pipe and the boiler 30 needs to be repaired in time. According to the process layout, the pipe between the outlet of the secondary dust collector 80 and the inlet of the circulation fan 40 is a circular pipe with a certain straight pipe section, which is more conducive to instrument testing, and further enables the test result of the flue gas humidity meter to be more accurate.

[0031] In some embodiments of the present application, the flue gas humidity meter 90 is arranged between the outlet of the heat exchanger 50 and the first inlet 11 of the coke dry quenching furnace 10. In the embodiment of the present application, the flue gas humidity meter 90 detects the humidity of the circulating gas discharged from the heat exchanger 50. When the detected value is higher than the normal humidity value in the circulating gas, it indicates that the boiler 30 has burst a pipe and the boiler 30 needs to be repaired in time.

[0032] Specifically, as Figure 1 shown, the gas passage includes a first pipe 77 and a second pipe 78. The two ends of the first pipe 77 are respectively communicated with the outlet of the secondary dust collector 80 and the inlet of the circulation fan 40; the two ends of the second pipe 78 are respectively communicated with the outlet 31 of the boiler and the inlet 81 of the secondary dust collector. The flue gas humidity meter 90 is arranged on the first outlet pipe 73, the first pipe 77 or the second pipe 78. The circulating gas exchanges heat with the boiler 30, and the gas entering the first outlet pipe 73, the first pipe 77 or the second pipe 78 is low-temperature gas, and the pipe temperature is 160°C to 180°C.

[0033] In some embodiments of the present application, the flue gas humidity meter 90 is an online capacitive flue gas humidity meter. The humidity meter has a probe, and the probe can pass through the inner wall of the pipe and enter the central area of the pipe, so as to detect the circulating gas in the pipe.

[0034] In the embodiment of the present application, the online capacitive flue gas humidity meter is an anti-wear and anti-corrosion device that can overcome the problems of dust, high temperature and acid corrosion of the circulating gas, and can measure the humidity in the circulating gas stably online for a long time, and can work reliably for a long time without affecting the measurement accuracy.

[0035] There are generally dust and acidic substances such as SO2 in the circulating gas. How to overcome high temperature, high dust and acidic substances to ensure the on-line measurement of the humidity of the circulating gas is a very difficult problem. Common humidity measurement methods include: condensation method, dry and wet bulb method, weighing method, dew point method and electronic sensor method. In the embodiment of the present application, a MODEL535 flue gas humidity meter is selected, and an anti-wear and anti-corrosion device that can overcome the problems of dust, high temperature and acidic corrosion of the flue gas and can measure the humidity in the flue gas stably for a long time on-line is used to effectively protect the on-line capacitive flue gas humidity meter and achieve long-term reliable operation without affecting the measurement accuracy.

[0036] In some embodiments of the present application, the coke dry quenching system further includes a first relief valve 61, a second relief valve 62 and a third relief valve 63. The coke dry quenching furnace 10 includes a pre-storage chamber. The first relief valve 61 is communicated with the pre-storage chamber; the second relief valve 62 is communicated with the primary dust collector 20; the third relief valve 63 is communicated with the heat exchanger 50.

[0037] In the embodiment of the present application, the circulating gas discharged from the circulating fan 40 enters the heat exchanger 50 for heat exchange so that the circulating gas can be better cooled. The circulating gas cooled by the heat exchanger 50 enters the coke dry quenching furnace 10 to cool the red-hot coke. When the coke dry quenching system is in normal production, the first relief valve 61 and the second relief valve 62 are closed, and the third relief valve 63 is opened. The gas flow rate can be adjusted by adjusting the third relief valve 63, and then the pressure in the pre-storage chamber can be adjusted; when a power failure or a boiler 30 burst pipe accident occurs, the circulating fan 40 stops. Since combustible components such as CO and H2 are continuously released from the red coke in the coke dry quenching furnace 10, a large amount of nitrogen needs to be filled into the coke dry quenching circulation system to keep the pressure in the system positive, prevent air from entering the coke dry quenching system, and protect the safety of the coke dry quenching system. Since nitrogen is continuously filled into the coke dry quenching system, the gas in the system continuously increases. To prevent the hot gas from entering the boiler 30, the first relief valve 61 and the second relief valve 62 are opened so that the excess gas is discharged through the first relief valve 61 and the second relief valve 62. By providing the first relief valve 61 communicated with the pre-storage chamber of the coke dry quenching furnace 10 and the second relief valve 62 communicated with the primary dust collector 20, after the boiler 30 stops working, most of the hot gas can be quickly discharged through the first relief valve 61 and the second relief valve 62, so that the hot gas cannot enter the boiler 30, which can better protect the boiler 30 from damage and further improve the safe operation of the coke dry quenching system.

[0038] The gas passage includes: a first relief passage 71 communicated with the pre-storage chamber in the coke dry quenching furnace 10, a second relief passage 72 communicated with the heat exchanger 50. The first relief valve 61 is arranged in the first relief passage 71, the second relief valve 62 is arranged in the primary dust collector 20, and the third relief valve 63 is arranged in the second relief passage 72.

[0039] Specifically, such asFigure 1 As shown, the second discharge channel 72 includes a main channel 721 and a bypass channel 722, and the main channel 721 and the bypass channel 722 are arranged in parallel; a third discharge valve 63 is provided on the main channel, the third discharge valve 63 is a pneumatic valve, and a first manual valve 7221 is provided on the bypass channel 722. The main channel 721 and the bypass channel 722 are arranged in parallel. When the third discharge valve 63 fails and gas cannot flow through the main channel 721, an operator can manually open the first manual valve 7221 so that the circulating gas can be discharged from the bypass channel 722. By providing the main channel 721 and the bypass channel 722, the reliability and safety of the coke dry quenching system operation are improved.

[0040] In some embodiments of the present application, the gas channel further includes a first outlet channel 73, a second outlet channel 74, and a third outlet channel 75. The heat exchanger 50 includes a first outlet 501 and a second outlet 502. The first outlet 501 of the heat exchanger 50 is communicated with the first inlet 11 of the coke dry quenching furnace 10 through the first outlet channel 73. The third outlet channel 75 is arranged between the outlet of the coke dry quenching furnace 10 and the inlet of the primary dust collector 20; the second outlet 502 is communicated with the inlet of the third outlet channel 75 through the second outlet channel 74; a bypass valve 741 is provided on the second outlet channel 74 for controlling the on / off of the gas in the second outlet channel 74.

[0041] In the embodiments of the present application, the circulating gas cooled by the heat exchanger 50 is discharged from the first outlet 501, enters the inlet of the coke dry quenching furnace 10 through the first outlet channel 73, and then enters the interior of the coke dry quenching furnace 10 to exchange heat with the red-hot coke; when the temperature of the circulating gas at the inlet of the boiler 30 is too high, the cooled circulating gas is discharged from the second outlet 502, passes through the second outlet channel 74 to enter the primary dust collector 20, and then enters the boiler 30, thereby reducing the temperature of the circulating gas at the inlet of the boiler 30 and ensuring the normal operation of the coke dry quenching system. When the temperature of the circulating gas at the inlet of the boiler 30 is normal, the bypass valve 741 is in a closed state. Through the above settings, the stable operation of the coke dry quenching system can be better controlled by the circulating gas after heat exchange.

[0042] Specifically, as Figure 1 shown, the outlet of the second outlet channel 74 is arranged at the outlet of the coke dry quenching furnace 10, so that the low-temperature circulating gas after heat exchange can enter from the inlet of the third outlet channel 75. The inlet of the third outlet channel 75 is opposite to and communicated with the outlet of the coke dry quenching furnace 10, so that the low-temperature gas discharged from the second outlet channel 74 can enter the boiler 30 through the primary dust collector 20, reducing the temperature of the circulating gas entering the boiler 30.

[0043] In some embodiments of the present application, an adjusting flap 731 is provided on the first air outlet passage 73 for adjusting the gas distribution amount entering the dry quenching furnace 10 from the first air outlet 501 of the heat exchanger 50.

[0044] In an embodiment of the present application, the adjusting flap 731 provided on the first air outlet passage 73 can adjust the circulating gas distribution amount entering the dry quenching furnace 10 from the heat exchanger 50, that is, adjust the gas volume entering the central air cap and the peripheral air ring of the air distribution device 12.

[0045] In some embodiments of the present application, an air distribution device 12 is provided at the lower part of the dry quenching furnace 10.

[0046] In an embodiment of the present application, the air distribution device 12 is arranged at the lower part of the dry quenching furnace 10. When the coke falls in the dry quenching furnace 10, the air distribution device 12 can play a buffering role to prevent the coke from accumulating and blocking at the coke discharging port of the dry quenching furnace 10. In addition, the circulating gas after heat exchange in the heat exchanger 50 is discharged through the air distribution device 12, making the gas flow in the dry quenching furnace 10 more uniform, and thus improving the cooling efficiency of the coke in the dry quenching furnace 10.

[0047] In some embodiments of the present application, the dry coke quenching system further includes an air input passage 76, and the dry quenching furnace 10 further includes a second air inlet (not shown in the figure). The air input passage 76 is communicated with the second air inlet of the dry quenching furnace 10 for introducing air into the dry quenching furnace 10.

[0048] In an embodiment of the present application, since the red-hot coke in the dry quenching furnace 10 continuously releases combustible components, the air enters the dry quenching furnace 10 through the air introduction passage and burns with the combustible components, reducing the risk of explosion of the dry quenching furnace 10 caused by excessive combustible components in the dry quenching furnace 10.

[0049] Specifically, an air inlet valve 761 is provided on the air introduction passage.

[0050] The above are only the preferred embodiments of the present application and are not intended to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A coke dry quenching system, characterized in that, Comprising: A gas passage, and a coke dry quenching furnace (10), a primary dust collector (20), a boiler (30), a secondary dust collector (80), a circulation fan (40), and a heat exchanger (50) that are sequentially connected through the gas passage; A flue gas humidity meter (90), which is arranged between the outlet of the boiler (30) and the first inlet (11) of the coke dry quenching furnace (10), and is used to detect the humidity of the circulating gas in the gas passage.

2. The coke dry quenching system according to claim 1, wherein, The flue gas humidity meter (90) is arranged between the outlet of the boiler (30) and the inlet of the secondary dust collector (80).

3. The coke dry quenching system according to claim 1, characterized in that, The flue gas humidity meter (90) is arranged between the outlet of the secondary dust collector (80) and the inlet of the circulation fan (40).

4. The coke dry quenching system according to claim 1, characterized in that, The flue gas humidity meter (90) is arranged between the outlet of the heat exchanger (50) and the first inlet (11) of the coke dry quenching furnace (10).

5. The coke dry quenching system according to claim 1, characterized in that, The flue gas humidity meter (90) is an on-line resistance capacitance type flue gas humidity meter.

6. The coke dry quenching system according to any one of claims 1-5, characterized in that, The coke dry quenching system further includes a first relief valve (61), a second relief valve (62), and a third relief valve (63). The coke dry quenching furnace (10) includes a pre-storage chamber. The first relief valve (61) is communicated with the pre-storage chamber; the second relief valve (62) is communicated with the primary dust collector (20); the third relief valve (63) is communicated with the heat exchanger (50).

7. The coke dry quenching system according to any one of claims 1-5, characterized in that, The gas passage further includes a first outlet passage (73), a second outlet passage (74), and a third outlet passage (75). The heat exchanger (50) includes a first outlet (501) and a second outlet (502). The first outlet (501) of the heat exchanger (50) is communicated with the first inlet (11) of the coke dry quenching furnace (10) through the first outlet passage (73). The third outlet passage (75) is arranged between the outlet of the coke dry quenching furnace (10) and the inlet of the primary dust collector (20); the second outlet (502) is communicated with the inlet of the third outlet passage (75) through the second outlet passage (74); A bypass valve (741) is provided on the second outlet passage (74) for controlling the on-off of the gas in the second outlet passage (74).

8. The coke dry quenching system according to claim 7, characterized in that, An adjusting flap (731) is provided on the first outlet passage (73) for adjusting the gas distribution amount entering the coke dry quenching furnace (10) from the first outlet (501) of the heat exchanger (50).

9. The coke dry quenching system according to any one of claims 1-5, characterized in that, A air distribution device (12) is provided at the lower part of the coke dry quenching furnace (10).

10. The coke dry quenching system according to any one of claims 1-5, characterized in that, The coke dry quenching system further includes an air input passage (76). The coke dry quenching furnace (10) further includes a second inlet. The air input passage (76) is communicated with the second inlet of the coke dry quenching furnace (10) for introducing air into the coke dry quenching furnace (10).

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