Dry quenching system

Abstract

The embodiment of the utility model provides a dry quenching system. The dry quenching system comprises a gas channel, a stop valve, a dry quenching furnace, a primary dust remover, a boiler and a circulating fan, wherein the dry quenching furnace, the primary dust remover, the boiler and the circulating fan are sequentially communicated through the gas channel; the cut-off valve is arranged between the primary dust remover and the boiler, and when power failure occurs or the boiler breaks down, the cut-off valve can cut off circulation of circulating gas between the primary dust remover and the boiler. When the dry quenching system is powered off or the boiler breaks down, gas circulation between the primary dust remover and the boiler is cut off through the cut-off valve, and the boiler is protected.

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. When a power outage or a boiler tube explosion occurs in the coke dry quenching system, the boiler stops working. If the hot gas discharged from the coke dry quenching furnace enters the boiler, the temperature of the boiler furnace tube wall will be relatively high. When restarting the boiler water supply, due to the large temperature difference between the inside and outside of the furnace tube, it will cause damage to the furnace tube and even lead to another tube explosion, damaging the boiler and affecting the operation of the coke dry quenching system. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide a coke dry quenching system to reduce the probability of boiler damage. The specific technical solutions are as follows:

[0004] The embodiments of this application provide a coke dry quenching system, which includes: a gas passage; a coke dry quenching furnace, a primary dust collector, a boiler, and a circulation fan that are sequentially connected through the gas passage; a cut-off valve; the cut-off valve is arranged between the primary dust collector and the boiler, and when a power outage or the boiler fails, the cut-off valve can cut off the circulation of the circulating gas between the primary dust collector and the boiler.

[0005] In some embodiments, the coke dry quenching system further includes a heat exchanger, a first relief valve, a second relief valve, and a third relief valve; the heat exchanger is arranged between the first air inlet of the coke dry quenching furnace and the air outlet of the circulation fan; the gas passage includes: a first relief passage communicating with the pre-storage chamber in the coke dry quenching furnace, and a second relief passage communicating with the heat exchanger, the first relief valve is arranged on the first relief passage, the second relief valve is arranged on the primary dust collector, and the third relief valve is arranged on the second relief passage.

[0006] In some embodiments, the second relief passage includes a main passage and a bypass passage, and the main passage and the bypass passage are arranged in parallel; the third relief valve is arranged on the main passage, the third relief valve is a pneumatic valve, and a first manual valve is arranged on the bypass passage.

[0007] In some embodiments, the first relief valve and the second relief valve are respectively a first water seal valve and a second water seal valve, and a second manual valve is further arranged on the first relief passage.

[0008] In some embodiments, the coke dry quenching system further includes a secondary dust collector, and the secondary dust collector is arranged between the air inlet of the circulation fan and the air outlet of the boiler.

[0009] 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 first gas outlet is communicated with a first gas inlet of the coke dry quenching furnace through the first gas outlet channel. The third gas outlet channel is arranged between the gas outlet of the coke 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 for controlling the on-off of the gas in the second gas outlet channel.

[0010] In some embodiments, an adjusting flap is arranged on the first gas outlet channel for adjusting the gas distribution amount entering the coke dry quenching furnace from the first gas outlet.

[0011] In some embodiments, the coke dry quenching system further includes an air input channel communicated with the coke dry quenching furnace for introducing air into the coke dry quenching furnace.

[0012] In some embodiments, the cut-off valve is a slide valve.

[0013] In some embodiments, the valve plate material of the slide valve is a refractory material.

[0014] In the coke dry quenching system provided by the embodiments of the present application, along the flowing direction of the circulating gas, the coke dry quenching furnace, the primary dust collector, and the boiler are sequentially communicated through the gas channel. The circulating gas comes out of the coke dry quenching furnace and then enters the primary dust collector for dust removal. The circulating gas coming out of the primary dust collector enters the boiler for heat exchange. When the coke dry quenching system is powered off or the boiler fails, the boiler stops working, and the gas flow between the primary dust collector and the boiler is cut off through the cut-off valve, that is, the hot gas entering the boiler is cut off through the cut-off valve, preventing the high-temperature circulating gas from entering the boiler and increasing the temperature of the boiler furnace tube wall, resulting in damage to the boiler furnace tube when the boiler is refilled with water due to too large a temperature difference between the inside and outside of the boiler furnace tube, thus realizing the protection of the boiler. In addition, through the above settings, the boiler can be quickly cooled down, facilitating personnel to enter the inside of the boiler for maintenance, and greatly shortening the shutdown maintenance time.

[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 drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

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

[0018] Reference numerals:

[0019] Coke dry quenching furnace 10; pre-storage chamber 101; first air inlet 11; air distribution device 12; coke discharging device 13; coke transfer-out device 14; charging device 15; primary dust collector 20; boiler 30; circulating fan 40; heat exchanger 50; first air outlet 501; second air outlet 502; first relief valve 61; second relief valve 62; third relief valve 63; first relief passage 71; second manual valve 711; second relief passage 72; main passage 721; bypass passage 722; first manual valve 7221; first air outlet passage 73; regulating flap 731; second air outlet passage 74; bypass valve 741; third air outlet passage 75; air input passage 76; air inlet valve 761; first dust collection passage 77; second dust collection passage 78; dust hood 79; secondary dust collector 80; cut-off valve 90. Specific embodiments

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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] 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, a cut-off valve 90, a coke dry quenching furnace 10, a primary dust collector 20, a boiler 30, and a circulating fan 40 that are sequentially connected through the gas passage along the circulating gas flow direction; the cut-off valve 90 is provided between the primary dust collector 20 and the boiler 30, and when a power outage occurs or the boiler 30 fails, the cut-off valve 90 can cut off the circulation of the circulating gas between the primary dust collector 20 and the boiler 30.

[0022] In the embodiments of the present application, along the direction of the circulating gas flow, the coke dry quenching furnace 10, the primary dust collector 20, and the boiler 30 are sequentially connected through a gas passage. After the circulating gas comes out of the coke dry quenching furnace 10, it enters the primary dust collector 20 for dust removal, and the circulating gas coming out of the primary dust collector 20 enters the boiler 30 for heat exchange. When the coke dry quenching system loses power, the boiler 30 stops working, and the gas flow between the primary dust collector 20 and the boiler 30 is cut off by the cut-off valve 90, that is, the hot gas entering the boiler 30 is cut off by the cut-off valve 90, preventing the high-temperature circulating gas from entering the boiler 30 and causing the temperature of the boiler tube wall of the boiler 30 to rise, resulting in damage to the boiler tube of the boiler 30 when the boiler 30 is refilled with water due to too large a temperature difference between the inside and outside of the boiler tube, thereby realizing the protection of the boiler 30; in addition, through the above settings, the boiler can be quickly cooled down, facilitating personnel to enter the interior of the boiler 30 for maintenance, and greatly shortening the shutdown maintenance time.

[0023] Specifically, the cut-off valve 90 is arranged on the side of the circulating passage close to the boiler 30.

[0024] 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 charged into the coke dry quenching furnace 10 through the charging device for cooling. The red-hot coke exchanges heat countercurrently with the inert gas in the coke dry quenching furnace 10, 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 communicated with the coke discharging port of the coke dry quenching furnace 10. After the cooled coke is discharged through the coke discharging device 13, it is transferred by the coke transferring device 14.

[0025] The hot circulating gas discharged from the coke dry quenching furnace 10 enters the boiler 30 for heat exchange after being dust-removed by the primary dust collector 20, and the temperature drops to 160 - 180 °C. The cold circulating gas coming out of the boiler 30 is dust-removed by the secondary dust collector 80, pressurized by the circulating fan 40, and then cooled to about 130 °C by the heat exchanger 50 and enters the coke dry quenching furnace 10 for recycling.

[0026] In some embodiments of the present application, as Figure 1 shown, the coke dry quenching system further includes a heat exchanger 50, a first relief valve 61, a second relief valve 62, and a third relief valve 63; the coke dry quenching furnace 10 has a first air inlet 11, and the heat exchanger 50 is arranged between the first air inlet 11 of the coke dry quenching furnace 10 and the outlet of the circulating fan 40; the coke dry quenching furnace 10 includes a pre-storage chamber 101, and the gas passage includes: a first relief passage 71 communicated with the pre-storage chamber 101 in the coke dry quenching furnace 10, and a second relief passage 72 communicated with the heat exchanger 50. The first relief valve 61 is arranged on the first relief passage 71, the second relief valve 62 is arranged on the primary dust collector 20, and the third relief valve 63 is arranged on the second relief passage 72.

[0027] In the embodiments 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 cooled better. The circulating gas cooled by the heat exchanger 50 enters the dry quenching furnace 10 to cool the red-hot coke. When the dry quenching coke 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 can be adjusted by adjusting the third relief valve 63, thereby adjusting the pressure in the pre-storage chamber 101. When a power failure or a boiler 30 tube burst accident occurs, the circulating fan 40 stops running. Since a large amount of combustible components such as CO and H2 are continuously released from the red coke in the dry quenching furnace 10, a large amount of nitrogen needs to be filled into the dry quenching coke circulation system to keep the pressure in the system positive, preventing air from entering the dry quenching coke system and protecting the safety of the dry quenching coke system. Since nitrogen is continuously filled into the dry quenching coke 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 from the first relief valve 61 and the second relief valve 62. By providing the first relief valve 61 communicating with the pre-storage chamber 101 of the dry quenching furnace and the second relief valve 62 communicating with the primary dust collector 20, after the boiler stops working, most of the hot gas can be quickly discharged through the first relief valve 61 and the second relief valve 62, and a small amount of hot gas discharged in time is blocked by the cut-off valve 90, preventing the hot gas from entering the boiler 30, better protecting the boiler 30 from damage, and thereby improving the operating efficiency of the dry quenching coke system.

[0028] Specifically, the heat exchanger 50 is a heat pipe heat exchanger or can also be a feed water preheater. The third relief valve 63 can be a butterfly valve.

[0029] More specifically, the dry quenching coke system further includes a first dust collection channel 77, a second dust collection channel 78, and a dust collection hood 79. The dust collection hood 79 communicates with the first relief channel 71 and the second relief channel 72. The dust collection hood 79 can collect the relief gas from the pre-storage chamber 101 and the relief gas after the fan through the first relief channel 71 and the second relief channel 72. The first dust collection channel 77 communicates with the charging device 15 and the dust collection hood 79, so that the first dust collection channel 77 can collect the dust generated during the process of charging coke into the dry quenching furnace 10, as well as the relief gas from the pre-storage chamber 101 and the relief gas after the fan. The second dust collection channel 78 is connected to the coke discharging device 13 and is used to collect the dust generated during the coke discharging process of the coke discharging device 13, reducing the dispersion of dust, making the dry quenching coke system provided by the embodiments of the present application more environmentally friendly.

[0030] In some embodiments of the present application, the second relief channel 72 includes a main channel 721 and a bypass channel 722. The main channel 721 and the bypass channel 722 are arranged in parallel; the third relief valve 63 is provided on the main channel. The third relief valve 63 is a pneumatic valve, and a first manual valve 7221 is provided on the bypass channel 722.

[0031] In the embodiments of the present application, as Figure 1 shown, the main channel 721 and the bypass channel 722 are arranged in parallel. When the third relief 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 through 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.

[0032] Specifically, the first manual valve 7221 can be a butterfly valve.

[0033] In some embodiments of the present application, the first relief valve 61 and the second relief valve 62 are a first water seal valve and a second water seal valve respectively, and a second manual valve 711 is further provided on the first relief channel 71. In the embodiments of the present application, the water seal valve has reliable sealing. When the first water seal valve fails, the first relief channel 71 can also be closed by the second manual valve 711 so that gas cannot be discharged through the first relief channel 71.

[0034] In some embodiments of the present application, the coke dry quenching system further includes a secondary dust collector 80, and the secondary dust collector 80 is arranged between the air inlet of the circulating fan 40 and the air outlet of the boiler 30.

[0035] In the embodiments of the present application, the secondary dust collector 80 is arranged between the air inlet of the circulating fan 40 and the air outlet of the boiler 30. The circulating gas after heat exchange with the boiler 30 enters the secondary dust collector 80 for further dust removal, further reducing the content of coke powder in the circulating gas and reducing the amount of coke powder entering the circulating fan 40 to protect the circulating fan 40.

[0036] In some embodiments of the present application, as Figure 1 shown, the gas channel further includes a first air outlet channel 73, a second air outlet channel 74 and a third air outlet channel 75. The heat exchanger 50 includes a first air outlet 501 and a second air outlet 502. The first air outlet 501 is communicated with the first air inlet 11 of the coke dry quenching furnace 10 through the first air outlet channel 73, and the second air outlet 502 is communicated with the air inlet of the third air outlet channel 75 through the second air outlet channel 74; the third air outlet channel 75 is arranged between the air outlet of the coke dry quenching furnace 10 and the air inlet of the primary dust collector 20, and a bypass valve 741 is provided on the second air outlet channel 74 for controlling the on-off of the gas in the second air outlet channel 74.

[0037] In the embodiments of the present application, the circulating gas cooled by the heat exchanger 50 is discharged from the first air outlet 501, enters the inlet of the coke dry quenching furnace 10 through the first air outlet passage 73, and then enters the interior of the coke dry quenching furnace 10 to exchange heat with the red-hot coke; when the temperature in the boiler 30 is too high, the cooled circulating gas passes through the second air outlet 502, enters the primary dust collector 20 through the second air outlet passage 74, and then enters the boiler 30 to cool the boiler 30. When the coke dry quenching system operates normally and the temperature of the boiler 30 is normal, the bypass valve 741 is in a closed state. Through the above settings, the boiler 30 can be better protected by the circulating gas after heat exchange, preventing the boiler 30 from being damaged due to overheating.

[0038] Specifically, the air outlet of the second air outlet passage 74 is arranged at the air 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 air outlet passage 75. The inlet of the third air outlet passage 75 is opposite to and communicated with the air outlet of the coke dry quenching furnace 10, so that the low-temperature gas discharged from the second air outlet passage 74 can enter the boiler 30 through the primary dust collector 20, reducing the temperature of the circulating gas entering the boiler 30.

[0039] 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 coke dry quenching furnace 10 from the first air outlet 501.

[0040] In the embodiments 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 coke dry quenching furnace 10 from the heat exchanger 50, that is, adjust the gas amounts entering the central air cap and the peripheral air ring of the air distribution device 12.

[0041] In some embodiments of the present application, the coke dry quenching system further includes an air input passage 76. The air input passage 76 is communicated with the coke dry quenching furnace 10 for introducing air into the coke dry quenching furnace 10.

[0042] In the embodiments of the present application, since the red-hot coke in the coke dry quenching furnace 10 continuously releases combustible components, the air enters the coke dry quenching furnace 10 through the air introduction passage and burns with the combustible components, reducing the risk of explosion of the coke dry quenching furnace 10 caused by excessive combustible components in the coke dry quenching furnace 10.

[0043] Specifically, an air introduction valve 761 is provided on the air introduction passage.

[0044] In some embodiments of the present application, the cut-off valve 90 is a slide valve, and the valve plate material of the slide valve is a refractory material.

[0045] In the embodiments of the present application, the cut-off valve 90 is a slide gate valve, which is more suitable for channels with a larger diameter. The slide gate valve has a valve plate, and the material of the valve plate is a refractory material, which can reduce the risk of high-temperature deformation. Specifically, the valve plate of the slide gate valve can be made of heat-resistant cast iron plate or a valve plate cast with refractory material. It should be noted that the rise and fall of the valve plate of the slide gate valve are realized by a screw motor, a hoist or a winch. During the normal production of the coke dry quenching system, the valve plate of the slide gate valve is fully opened, and the circulating gas normally enters the boiler 30 for waste heat utilization. When a power outage or a boiler tube explosion accident occurs, the valve plate of the slide gate valve fully drops, separating the primary dust collector 20 from the boiler 30 to prevent hot gas from entering the boiler 30. By cutting off the hot gas entering the boiler 30, it can prevent damage to the boiler tubes and even another tube explosion due to a large temperature difference between the inside and outside of the boiler tubes when restarting the boiler 30 to fill water. It can also quickly cool down the boiler 30, facilitating personnel to enter the inside of the boiler 30 for maintenance, and greatly shortening the shutdown maintenance time.

[0046] In some embodiments of the present application, a air distribution device 12 is provided in the coke dry quenching furnace.

[0047] In the embodiments of the present application, the air distribution device 12 is arranged at the lower part of the coke dry quenching furnace 10. When the coke falls in the coke dry quenching furnace 10, the air distribution device 12 can play a buffering role to prevent the coke from piling up and blocking at the coke discharging port of the coke 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 coke dry quenching furnace 10 more uniform, thereby improving the cooling efficiency of the coke in the coke dry quenching furnace 10.

[0048] 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; A coke dry quenching furnace (10), a primary dust collector (20), a boiler (30), and a circulation fan (40) that are sequentially connected through the gas passage; A cut-off valve (90); the cut-off valve (90) is provided between the primary dust collector (20) and the boiler (30), and when a power outage occurs or the boiler (30) malfunctions, the cut-off valve (90) can cut off the circulation of the circulating gas between the primary dust collector (20) and the boiler (30).

2. The coke dry quenching system according to claim 1, wherein The coke dry quenching system further includes a heat exchanger (50), a first relief valve (61), a second relief valve (62), and a third relief valve (63); The heat exchanger (50) is provided between the first air inlet (11) of the coke dry quenching furnace (10) and the air outlet of the circulation fan (40); The gas passage further includes: a first relief passage (71) communicating with the pre-storage chamber (101) in the coke dry quenching furnace (10), and a second relief passage (72) communicating with the heat exchanger (50), The first relief valve (61) is provided in the first relief passage (71), the second relief valve (62) is provided in the primary dust collector (20), and the third relief valve (63) is provided in the second relief passage (72).

3. The coke dry quenching system according to claim 2, characterized in that, The second relief passage (72) includes a main passage (721) and a bypass passage (722), and the main passage (721) and the bypass passage (722) are arranged in parallel; the third relief valve (63) is provided on the main passage (721), the third relief valve (63) is a pneumatic valve, and a first manual valve (7221) is provided on the bypass passage (722).

4. The coke dry quenching system according to claim 2, characterized in that, The first relief valve (61) and the second relief valve (62) are a first water seal valve and a second water seal valve respectively, and a second manual valve (711) is further provided on the first relief passage (71).

5. The coke dry quenching system according to claim 1, characterized in that, The coke dry quenching system further includes a secondary dust collector (80), and the secondary dust collector (80) is provided between the air inlet of the circulation fan (40) and the air outlet of the boiler (30).

6. The coke dry quenching system according to claim 2, characterized in that, The gas passage further includes a first air outlet passage (73), a second air outlet passage (74), and a third air outlet passage (75), the heat exchanger (50) includes a first air outlet (501) and a second air outlet (502), the first air outlet (501) is communicated with the first air inlet (11) of the coke dry quenching furnace (10) through the first air outlet passage (73), and the third air outlet passage (75) is provided between the air outlet of the coke dry quenching furnace (10) and the air inlet of the primary dust collector (20); the second air outlet (502) is communicated with the air inlet of the third air outlet passage (75) through the second air outlet passage (74); A bypass valve (741) is provided on the second air outlet passage (74) for controlling the on-off of the gas in the second air outlet passage (74).

7. The coke dry quenching system according to claim 6, characterized in that An adjusting flap (731) is provided on the first air outlet passage (73) for adjusting the gas distribution amount entering the coke dry quenching furnace (10) from the first air outlet (501).

8. The coke dry quenching system according to any one of claims 1-7, characterized in that, The coke dry quenching system further includes an air input channel (76), which is communicated with the coke dry quenching furnace (10) and is used for introducing air into the coke dry quenching furnace (10).

9. The coke dry quenching system according to any one of claims 1-7, characterized in that, The cut-off valve (90) is a knife gate valve.

10. The coke dry quenching system according to claim 9, characterized in that, The valve plate material of the knife gate valve is refractory material.

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