Energy complementing device and method of dry quenching system
By introducing energy-replenishing combustion systems and waste heat boilers into the dry coke quenching system, the self-heating combustion of high-temperature coke powder is used to generate hot flue gas, which solves the problems of heat waste of coke powder and inefficiency of equipment, and achieves efficient energy recovery and stable operation of equipment, and improves power generation efficiency and production load.
Patent Information
- Application Number
- CN202510770633.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-07-25
AI Technical Summary
The dry-extinguishing system has waste of heat in the heat of the burner powder, complex processing procedures and safety and environmental risks, as well as the problem of low load operation of the full dry-extinguishing production, resulting in equipment life and power generation efficiency reduction.
By introducing an energy replenishment combustion system into the dry coke quenching system, the high-temperature coke powder is transported to the energy replenishment combustion system for self-heating combustion, generating hot flue gas and recycling sensible heat, combining with the waste heat boiler to generate steam for power generation, using a variety of solid waste as fuel, the flue gas temperature and oxygen content are controlled through an electric regulating valve to ensure stable operation of the system.
It realizes effective recovery of coke powder sensible heat, improves the energy utilization rate and equipment life of the dry coke quenching system, ensures the stability and environmental protection of the system, and improves power generation efficiency and production load.
Smart Images
Figure CN120365937A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of energy supplement devices, and particularly relates to an energy supplement device and method for a coke dry quenching system. Background Art
[0002] As an advanced process that uses inert gas to cool hot coke and recover waste heat, compared with the traditional water quenching method, the coke dry quenching technology shows significant advantages in energy conservation and environmental protection and has become the mainstream technology in the coke quenching process of coking production. In the coke dry quenching process, primary dust removal usually uses a sedimentation gravity dust collector or a cyclone dust collector. The flue gas at about 950 °C at the outlet of the coke dry quenching furnace enters the primary dust collector, and the collected high-temperature coke powder at 850 °C - 900 °C is mostly cooled to <200 °C by means of a water-cooled sleeve in China, and then transported to the ash bin for storage through a pneumatic ash conveying device or a scraper conveyor. However, the water-cooled sleeve with circulating water as the cooling medium has many disadvantages. It not only cannot effectively utilize the sensible heat of the coke powder, but also the heat transfer effect will decrease after scaling, affecting the cooling effect of the coke powder. There are also safety hazards when the high-temperature coke powder enters the ash bin. The coke powder collected by the secondary dust removal of the coke dry quenching is stored in the ash hopper at the lower part of the dust collector, and is also sent to the ash bin through a pneumatic ash conveying device or a scraper conveyor. A humidifier or a suction and discharge device is arranged at the lower part of the ash bin to transport the coke powder out regularly for general solid waste treatment. Most coking enterprises sell it at a low price as ordinary fuel, which not only causes energy waste, but also pollutes the environment. In addition, compared with wet coke quenching, dry coke quenching produces a large amount of coke powder, accounting for about 2% of the coke processing volume. For iron and steel integrated enterprises, it can be utilized through methods such as blast furnace injection, etc. However, independent coking plants often can only simply humidify and sell it as general solid waste, which is likely to cause environmental problems such as dust spillage, making the resource utilization of coke dry quenching coke powder an urgent problem to be solved for independent coking plants. With the increasingly strict environmental protection requirements, there is no production space for wet coke quenching in some areas, and full dry quenching production has become an inevitable trend. However, for enterprises adopting full dry quenching production, the overall utilization rate is only 50% - 70%, and low-load operation will cause a series of production and equipment problems such as shortened equipment life and reduced power generation efficiency of equipment such as boilers, secondary dust collectors, and fans in the coke dry quenching system. In view of this, the present invention proposes an energy supplement device and method for a coke dry quenching system. Summary of the Invention
[0003] The purpose of the present invention is to address the problems in the background art, including the waste of sensible heat of coke dry quenching coke powder, complex treatment processes with potential safety and environmental protection hazards, and the decrease in equipment life and power generation efficiency due to low-load operation in full dry quenching production, and to propose an energy supplement device and method for a coke dry quenching system.
[0004] On the one hand, the present invention provides an energy supplement device for a coke dry quenching system, including a coke dry quenching furnace; a dust collector for separating coke powder from the flue gas discharged from the coke dry quenching furnace; an energy supplement combustion system for generating hot flue gas for energy supplement, the energy supplement combustion system being connected to a silo through a feeding device; a return material device arranged between the dust collector and the energy supplement combustion system for controlling the circulation of coke powder while isolating the dust collector and the energy supplement combustion system; and a waste heat boiler for recovering the heat in the high-temperature flue gas.
[0005] Optionally, the energy supplement combustion system is connected with a blower through a pipeline.
[0006] Optionally, the return material device is non-mechanical and is U-shaped or L-shaped.
[0007] Optionally, the return material device uses compressed air after pressure reduction as the conveying medium, and the return material device is controlled by the material level, with high material level for return and low material level for stopping.
[0008] Optionally, the output end of the waste heat boiler is connected to the coke dry quenching furnace through a pipeline, and a circulating fan and a secondary economizer are installed on the pipeline.
[0009] Optionally, the intake pipeline of the blower is connected to a VOCS gas pipeline as the oxygen source of the energy supplement combustion system.
[0010] Optionally, the energy supplement combustion system includes an isobaric air chamber, a combustion device, and a settling chamber. The position where the energy supplement combustion system generates hot flue gas and introduces it into the coke dry quenching furnace is not limited to the annular air duct and other high-temperature parts of the coke dry quenching system, and the energy supplement combustion system has a desulfurization function.
[0011] Optionally, the combustion device provides the air required for coke powder combustion through multiple air inlets arranged at different heights above the combustion device in a way of staged air distribution, which can achieve stable combustion. At the same time, due to the uniform overall temperature distribution, it is beneficial to reduce NO X emissions.
[0012] Optionally, the silo stores secondary dust-removed coke powder, environmental dust, pulverized coal, biomass particles, etc., which are used as fuels for the energy supplement combustion system.
[0013] Optionally, an electric control valve is arranged on the pipeline between the energy supplement combustion system and the coke dry quenching furnace, and a cold air pipeline is connected to the electric control valve.
[0014] On the other hand, the present invention also provides an energy supplement method for an energy supplement device of a coke dry quenching system, including the following steps: Step 1: The red coke enters the dry quenching furnace through the hoist via the charging device. The circulating gas enters the dry quenching tank through the air-blowing device at the bottom of the dry quenching furnace for heat exchange with the coke. The red coke is cooled to below 200°C and discharged through the coke discharging device. Step 2: The 980°C circulating gas discharged from the dry quenching furnace enters the waste heat boiler for heat exchange after removing coke powder through the dust collector, and the temperature drops to about 170°C.
[0015] Step 3: The high-temperature hot coke powder separated by the dust collector falls into the return device to form a material seal, isolating the dust collector from the energy-supplement combustion system, ensuring the dust removal efficiency of the dust collector, preventing secondary entrainment. Compressed air enters the device through the air chamber at the bottom of the return device to fluidize the coke powder, and the coke powder slides through the chute to the energy-supplement combustion system. Step 4: The 850°C - 900°C high-temperature coke powder captured by the dust collector, whose temperature is higher than the ignition point of the coke powder, can burn when in contact with oxygen. The returned hot coke powder can absorb its sensible heat and also ensure the combustion effect of the coke powder. The return device can adjust the feeding amount by adjusting the amount of compressed air. At the same time, the return device is equipped with a level gauge and can also adjust the level through level interlock. Step 5: The hot coke powder enters the energy-supplement combustion system. Air enters the equal-pressure air chamber at the lower part of the combustion device through the blower and enters the combustion device through the air cap. The hot coke powder and air burn in the combustion device to generate hot flue gas at 850°C - 1000°C. Step 6: The secondary dust removal coke powder of the dry coke quenching system, environmental dust, and other dust in the coking plant can be sent to the silo as fuel and fed into the combustion device for combustion through the feeding device.
[0016] Step 7: A VOCS gas interface is reserved in the air pipeline at the inlet of the blower. The main component of the VOCS gas is air, with oxygen accounting for 19.2%. It can be used as the source of oxygen for the energy-supplement combustion system. At the same time, the organic matter in the VOCS gas can be treated in the high-temperature area of the energy-supplement combustion system to further recover sensible heat. Step 8: The 850°C - 1000°C hot flue gas generated by the energy-supplement combustion system enters the dry coke quenching system through the pipeline, further removes coke powder through the dust collector, and enters the waste heat boiler to generate steam for steam turbine power generation. Step 9: The heat temperature is controlled by an electric control valve to prevent the flue gas from overheating and meet the air intake requirements of the dry coke quenching system.
[0017] In summary, the present application includes at least one of the following beneficial technical effects: The present invention directly transports the 850℃~900℃ high-temperature coke powder captured by the dust collector to the energy supplement combustion system through the return device, and realizes "self-heating" combustion by using the sensible heat of the coke powder itself. Compared with the waste of sensible heat caused by cooling the coke powder with the traditional water-cooling sleeve, this design can ignite the coke powder without additional energy, and at the same time, generate 850℃~1000℃ hot flue gas through combustion, and convert the chemical energy and sensible heat of the coke powder into thermal energy synchronously. After being introduced into the CDQ furnace circulating flue gas system, the steam output of the waste heat boiler and the power generation of the steam turbine are significantly improved. In addition, the silo can simultaneously use carbon-containing solid wastes such as secondary dust removal coke powder, environmental dust removal ash, coal powder and biomass particles as fuel, further broadening the scope of energy recovery, reducing the dependence of enterprises on external fuels, and achieving the dual benefits of "solid waste resource utilization + energy value-added"; Furthermore, the electric regulating valve is linked to the cold air duct to accurately adjust the hot flue gas temperature and oxygen content to avoid damage to the CDQ system due to flue gas overheating or abnormal oxygen content. At the same time, the full CDQ production load is increased to ensure the life of boilers, fans and other equipment and power generation efficiency. In summary, the present invention achieves the comprehensive benefits of energy saving and efficiency improvement, environmental protection and safety, and stable operating conditions of the dry coke quenching system, improves the full dry quenching production load, and ensures the life and power generation efficiency of equipment such as boilers and fans. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The figure is a schematic diagram of the structure of an energy replenishment device for a dry coke quenching system.
[0019] Reference numerals: 1. CDQ furnace; 2. Dust collector; 3. Waste heat boiler; 4. Return device; 5. Energy supplement combustion system; 6. Blower; 7. Silo; 8. Electric regulating valve; 9. Circulating fan; 10. Auxiliary economizer. DETAILED DESCRIPTION
[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0021] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.
[0022] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.
[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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.
[0025] Embodiment:
[0026] As Figure 1 shown, a supplementary energy device for a coke dry quenching system proposed by the present invention includes a coke dry quenching furnace 1. The red coke enters the coke dry quenching furnace 1 through a charging device via a hoist. The circulating gas enters the dry quenching tank through a blowing device at the bottom of the coke dry quenching furnace 1 to exchange heat with the coke. The red coke is cooled to below 200°C and discharged through a coke discharging device. The coke dry quenching furnace 1 is a prior art and will not be elaborated here.
[0027] Furthermore, the above-mentioned supplementary energy device further includes a dust collector 2. The dust collector 2 is used to separate the coke powder in the flue gas discharged from the coke dry quenching furnace 1. The dust collector 2 is connected to the output end of the coke dry quenching furnace 1 through a pipeline. The dust collector 2 is a gravity settling dust collector or a cyclone dust collector. The high-temperature coke powder captured by the dust collector 2, with a temperature of 850°C to 900°C, is higher than the ignition point of the coke powder and can burn when in contact with oxygen. The recycled hot coke powder can absorb its sensible heat and also ensure the combustion effect of the coke powder.
[0028] Further, the energy replenishment device includes a return device 4 disposed between the dust collector 2 and the energy replenishment combustion system 5. The return device 4 is used to control the coke powder circulation while isolating the dust collector 2 from the energy replenishment combustion system 5. One output end of the dust collector 2 is connected to the return device 4. The return device 4 is non-mechanical, U-shaped or L-shaped, and has a material seal function, effectively isolating the dust collector 2 from the energy replenishment combustion system 5. The dust collector 2 separates high-temperature hot coke powder, which falls into the return device 4 to form a material seal, isolating the dust collector 2 from the energy replenishment combustion system 5, ensuring the efficiency of the dust collector 2 and preventing secondary entrainment. The return device 4 uses decompressed compressed air as the conveying medium. The compressed air enters the device through the air chamber at the bottom of the return device 4 to fluidize the coke powder, and the coke powder slides into the energy replenishment combustion system 5 through a chute. The feeding amount is adjusted by adjusting the amount of compressed air. The return device 4 is controlled by the material level, returning at high material level and stopping at low material level.
[0029] Furthermore, the above energy replenishment device further includes an energy replenishment combustion system 5, which is used to generate hot flue gas for energy replenishment. The energy replenishment combustion system 5 is connected to a silo 7 through a feeding device. The return device 4 is connected to the energy replenishment combustion system 5 through a pipeline. The energy replenishment combustion system 5 includes an isobaric air chamber, a combustion device, and a settling chamber. After the coke powder burns in the combustion device, the hot flue gas escapes large-particle dust through the settling chamber and enters the dry coke quenching furnace 1 through a pipeline. The position where the energy replenishment combustion system 5 generates hot flue gas and introduces it into the dry coke quenching furnace 1 is not limited to the annular air duct and other high-temperature parts of the dry coke quenching system.
[0030] The energy replenishment combustion system 5 adopts a method of staged air distribution. The air required for coke powder combustion is provided by multiple air inlets arranged at different heights above the combustion device, which can achieve stable combustion. At the same time, due to the uniform overall temperature distribution, it is beneficial to reduce NO X emissions.
[0031] The energy replenishment combustion system 5 has a desulfurization function. By spraying calcium into the furnace, the concentration of SO2 in the flue gas can be effectively controlled. The energy replenishment combustion system 5 is connected to the dry coke quenching furnace 1 through a pipeline. The 850°C - 1000°C hot flue gas generated by the energy replenishment combustion system 5 enters the dry coke quenching furnace 1 through a pipeline, further removes coke powder through the dust collector 2, and enters the waste heat boiler 3 to generate steam for steam turbine power generation.
[0032] An electric control valve 8 is provided on the pipeline between the energy replenishment combustion system 5 and the dry coke quenching furnace 1. A cold air pipeline is connected to the electric control valve 8, so that the temperature of the hot flue gas of the energy replenishment combustion system 5 can be adjusted in the range of 850°C - 1000°C. By adjusting the cold air volume through the electric control valve 8, the temperature and oxygen content of the hot flue gas are ensured, and the safety and stability of the dry coke quenching system are ensured. The hot temperature is controlled by the electric control valve 8 to prevent the flue gas from overheating, and at the same time meet the demand for introducing air into the dry coke quenching system.
[0033] The energy supplement combustion system 5 is connected with a blower 6 through a pipeline. Air enters the isobaric air chamber at the lower part of the combustion device through the blower 6 and enters the combustion device through the air cap. After the hot coke powder contacts the air, it burns in the combustion device, generating hot flue gas at 850 °C to 1000 °C. The intake pipeline of the blower 6 is connected to the VOCS gas pipeline. The main component of the VOCS gas is air, and its oxygen content is 19.2%. It can be used as the source of oxygen in the energy supplement combustion system 5. At the same time, the organic matter in the VOCS gas can be treated in the high-temperature area of the energy supplement combustion system 5 to further recover sensible heat. The energy supplement combustion system 5 is connected with a silo 7 through a feeding device. The silo 7 stores secondary dedusted coke powder, environmental dust removal ash, pulverized coal, biomass particles, etc., which are used as fuels for the energy supplement combustion system 5 and are fed into the energy supplement combustion system 5 through the feeding device. During the oven drying stage of the coke dry quenching furnace 1, by using coal, coke powder and biomass in the silo 7 as fuels, hot flue gas can be generated and used as the heat source for oven drying the system, realizing energy supplement, increasing the system load, preventing the equipment from operating under low load conditions, and increasing the steam output of the waste heat boiler 3, as well as the steam turbine power generation efficiency and power generation amount.
[0034] Finally, the above energy supplement device further includes a waste heat boiler 3, which is used to recover the heat in the high-temperature flue gas. The output end of the waste heat boiler 3 is connected to the coke dry quenching furnace 1 through a pipeline, and a circulating fan 9 and a secondary economizer 10 are installed on the pipeline. Another output end of the dust collector 2 is connected to the waste heat boiler 3 through a pipeline. The circulating gas discharged from the coke dry quenching furnace 1 is about 980 °C. After the coke powder is removed by the dust collector 2, it enters the waste heat boiler 3 for heat exchange, and the temperature drops to about 170 °C.
[0035] In this embodiment, in the coke powder collection and transportation link, the red coke enters the coke dry quenching furnace 1 through a hoist and a charging device. The circulating gas enters from the bottom air supply device of the coke dry quenching furnace 1, exchanges heat with the coke, cools the red coke to below 200 °C, and then is discharged. The circulating gas of about 980 °C output from the coke dry quenching furnace 1 enters the dust collector 2, and the dust collector 2 captures the high-temperature coke powder at 850 °C to 900 °C. These high-temperature coke powders fall into the non-mechanical return device 4 with a material sealing function, isolating the dust collector 2 from the energy supplement combustion system 5, preventing secondary entrainment and ensuring the dust removal efficiency. The return device 4 fluidizes the coke powder by using decompressed compressed air, controls the feeding amount by adjusting the gas volume, automatically starts and stops according to the material level, and transports the coke powder to the energy supplement combustion system 5. In the combustion heat generation link, inside the energy supplement combustion system 5, the blower 6 sends air into the lower isobaric air chamber and enters the combustion device through the air cap. At the same time, the VOCS gas pipeline is connected to the intake pipeline of the blower 6 to provide oxygen for combustion. The high-temperature coke powder from the return device 4 and fuels such as secondary dedusted coke powder, environmental dust removal ash, pulverized coal, and biomass particles fed into the silo 7 through the feeding device contact the air and burn fully in the combustion device, generating hot flue gas at 850 °C to 1000 °C. The hot flue gas first removes large particle dust in the sedimentation chamber and then enters the coke dry quenching furnace 1. In the flue gas treatment and utilization section, after the hot flue gas generated by the energy replenishment combustion system 5 enters the coke dry quenching furnace 1, it is further dedusted by the dust collector 2 and then enters the waste heat boiler 3. On the pipeline between the energy replenishment combustion system 5 and the coke dry quenching furnace 1, the electric control valve 8 is connected to the cold air pipeline. By adjusting the amount of cold air mixed, the temperature of the hot flue gas is controlled within the range of 850°C to 1000°C, ensuring that the temperature and oxygen content of the hot flue gas meet the requirements and guaranteeing the safe and stable operation of the coke dry quenching system. The hot flue gas exchanges heat in the waste heat boiler 3 to generate steam for steam turbine power generation, realizing energy recovery and utilization. In the circulating gas heat exchange section, the circulating gas at about 980°C discharged from the coke dry quenching furnace 1 enters the waste heat boiler 3 after being dedusted by the dust collector 2, and exchanges heat with other media in the waste heat boiler 3, and the temperature drops to about 170°C. The heat-exchanged circulating gas returns to the coke dry quenching furnace 1 through the pipeline, the circulating fan 9 and the secondary economizer 10 to complete the recycling and continuously provide cooling gas for the coke dry quenching process.
[0036] This energy replenishment device can expand the application function range of coke dry quenching. It can use carbon-containing solid wastes from multiple industries as fuels for the energy replenishment device to replenish energy for the coke dry quenching system, produce as much steam and electricity as possible, so as to improve the overall economic benefits.
[0037] An energy replenishment method for an energy replenishment device of a coke dry quenching system includes the following steps: Step 1, the red-hot coke enters the coke dry quenching furnace 1 through the charging device by the hoist. The circulating gas enters the dry quenching tank through the air-blowing device at the bottom of the coke dry quenching furnace 1 to exchange heat with the coke. The red-hot coke is cooled to below 200°C and discharged through the coke discharging device. Step 2, the 980°C circulating gas discharged from the coke dry quenching furnace 1 is dedusted by the dust collector 2 to remove coke powder, and then enters the waste heat boiler 3 for heat exchange, and the temperature drops to about 170°C.
[0038] Step 3, the high-temperature hot coke powder separated by the dust collector 2 falls into the return device 4 to form a material seal, isolating the dust collector 2 from the energy replenishment combustion system 5, ensuring the dust removal efficiency of the dust collector 2 and preventing secondary entrainment. Compressed air enters the device through the air chamber at the bottom of the return device 4 to fluidize the coke powder, and the coke powder slides through the chute to the energy replenishment combustion system 5. Step 4, the 850°C to 900°C high-temperature coke powder captured by the dust collector 2, whose temperature is higher than the ignition point of the coke powder, can burn when in contact with oxygen. The return of the hot coke powder can absorb its sensible heat and also ensure the combustion effect of the coke powder; the return device 4 can adjust the feeding amount by adjusting the amount of compressed air. At the same time, the return device 4 is provided with a level gauge, and the level can also be adjusted through level interlocking. Step 5, the hot coke powder enters the energy replenishment combustion system 5, and air enters the equal-pressure air chamber at the lower part of the combustion device through the blower 6 and enters the combustion device through the air cap. The hot coke powder and air burn in the combustion device to generate hot flue gas at 850°C to 1000°C. Step 6: The coke powder from the secondary dedusting of the coke dry quenching system, the environmental dust, and other dusts in the coking plant can be sent to the silo 7 as fuel and fed into the combustion device through the feeding device for combustion.
[0039] Step 7: A VOCS gas interface is reserved in the air pipeline at the inlet of the blower 6. The main component of the VOCS gas is air, with oxygen accounting for 19.2%. It can be used as the source of oxygen for the energy supplement combustion system 5. At the same time, the organic matter in the VOCS gas can be treated in the high-temperature area of the energy supplement combustion system 5 to further recover sensible heat. Step 8: The hot flue gas at 850°C - 1000°C generated by the energy supplement combustion system 5 enters the coke dry quenching system through the pipeline, further removes coke powder through the dust collector 2, and enters the waste heat boiler 3 to generate steam for steam turbine power generation. Step 9: The electric control valve 8 is used to control the heat temperature to prevent the flue gas from overheating and meet the demand for introducing air into the coke dry quenching system at the same time.
[0040] The above specific embodiments are only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.
Claims
1. An energy supplement device for a coke dry quenching system, characterized in that, Including: A coke dry quenching furnace (1); A dust collector (2) for separating coke powder from the flue gas discharged from the coke dry quenching furnace (1); An energy supplement combustion system (5) for generating hot flue gas for energy supplement, and the energy supplement combustion system (5) is connected to a silo (7) through a feeding device; A return material device (4) arranged between the dust collector (2) and the energy supplement combustion system (5), and the return material device (4) is used to control the coke powder circulation while isolating the dust collector (2) and the energy supplement combustion system (5); A waste heat boiler (3) for recovering the heat in the high-temperature flue gas.
2. The energy supplement device of a coke dry quenching system according to claim 1, characterized in that, The energy supplement combustion system (5) is connected to a blower (6) through a pipeline.
3. The energy supplement device of a coke dry quenching system according to claim 2, characterized in that, The return material device (4) is non-mechanical and is U-shaped or L-shaped.
4. The energy supplement device of a coke dry quenching system according to claim 3, characterized in that, The return material device (4) uses compressed air after decompression as the conveying medium, and the return material device (4) controls the material level, returns materials at high material level, and stops at low material level.
5. The energy supplement device of a coke dry quenching system according to claim 4, characterized in that, The output end of the waste heat boiler (3) is connected to the coke dry quenching furnace (1) through a pipeline, and a circulation fan (9) and a secondary economizer (10) are installed on the pipeline.
6. The energy supplement device for a coke dry quenching system according to claim 5, characterized in that, The intake pipeline of the blower (6) is connected to the VOCS gas pipeline as the oxygen source of the energy supplement combustion system (5).
7. The energy supplement device of a coke dry quenching system according to claim 6, characterized in that The energy supplement combustion system (5) includes an isobaric air chamber, a combustion device, and a settling chamber. The position where the energy supplement combustion system (5) introduces the hot flue gas into the coke dry quenching furnace (1) is not limited to the annular air duct and other high-temperature parts of the coke dry quenching system, and the energy supplement combustion system (5) has a desulfurization function.
8. The energy supplement device of a coke dry quenching system according to claim 7, characterized in that, The silo (7) stores secondary dust-removed coke powder, environmental dust removal ash, pulverized coal, biomass particles, etc., which are used as fuels for the energy supplement combustion system (5).
9. The energy supplement device for a coke dry quenching system according to claim 8, characterized in that An electric control valve (8) is arranged on the pipeline between the energy supplement combustion system (5) and the coke dry quenching furnace (1), and a cold air pipeline is connected to the electric control valve (8).
10. A method for energy supplement of the energy supplement device of the coke dry quenching system according to any one of claims 1-9, characterized in that, Including the following steps: Step 1, the red-hot coke enters the coke dry quenching furnace (1) through the hoist via the charging device, and the circulating gas enters the dry quenching tank through the air-blowing device at the bottom of the coke dry quenching furnace (1) for heat exchange with the coke. The red-hot coke is cooled to below 200 °C and discharged through the coke discharging device; Step 2, the 980 °C circulating gas discharged from the coke dry quenching furnace (1) enters the waste heat boiler (3) for heat exchange after the coke powder is removed by the dust collector (2), and the temperature drops to about 170 °C; Step 3, the high-temperature hot coke powder separated by the dust collector (2) falls into the return material device (4) to form a material seal, isolating the dust collector (2) from the energy supplement combustion system (5), ensuring the dust removal efficiency of the dust collector (2), preventing secondary entrainment, and compressed air enters the device through the air chamber at the bottom of the return material device (4) to fluidize the coke powder, and the coke powder slides to the energy supplement combustion system (5) through the chute; Step 4, the 850 °C - 900 °C high-temperature coke powder captured by the dust collector (2) has a temperature higher than the ignition point of the coke powder and can burn when in contact with oxygen. The return of the hot coke powder can absorb its sensible heat and also ensure the combustion effect of the coke powder; the return material device (4) can adjust the feeding amount by adjusting the amount of compressed air, and at the same time, the return material device (4) is provided with a level gauge and can also adjust the material level through level interlock; Step Five: The hot coke powder enters the energy supplement combustion system (5), and air enters the isobaric air chamber at the lower part of the combustion device through the blower (6) and then enters the combustion device through the air caps. The hot coke powder and air burn in the combustion device to generate hot flue gas at 850°C to 1000°C; Step Six: The coke powder from the secondary dust removal of the dry coke quenching system, the environmental dust removal ash, and other dust removal ash in the coking plant can be sent to the silo (7) for use as fuel and fed into the combustion device for combustion through the feeding device; Step Seven: A VOCS gas interface is reserved in the air pipeline at the inlet of the blower (6). The main component of the VOCS gas is air, with oxygen accounting for 19.2%. It can be used as the source of oxygen for the energy supplement combustion system (5). At the same time, the organic matter in the VOCS gas can be treated in the high-temperature area of the energy supplement combustion system (5) to further recover sensible heat; Step Eight: The hot flue gas at 850°C to 1000°C generated by the energy supplement combustion system (5) enters the dry coke quenching system through the pipeline, further removes coke powder through the dust collector (2), and enters the waste heat boiler (3) to generate steam for steam turbine power generation; Step Nine: The electric control valve (8) is used to control the heat temperature to prevent the flue gas from overheating and at the same time meet the demand for introducing air into the dry coke quenching system.