Energy supplement device of dry quenching coke system
By using the supplementary energy device of the dry quenching system, high-temperature coke powder is directly transported to the supplementary combustion system and its sensible heat is utilized. Combined with the waste heat boiler and circulating fan for energy recovery, the problems of coke powder sensible heat waste and equipment inefficiency are solved, achieving efficient energy utilization and equipment safety, and improving the overall operating performance of the dry quenching system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING JC ENERGY & ENVIRONMENT ENG
- Filing Date
- 2025-06-10
- Publication Date
- 2026-06-19
AI Technical Summary
The dry quenching process wastes sensible heat from coke powder, has a complex processing procedure, and poses safety and environmental hazards. Furthermore, the low-load operation of dry quenching production leads to a decrease in equipment lifespan and power generation efficiency.
Design an energy replenishment device for a dry quenching coke system. The high-temperature coke powder collected by the dust collector is transported to the energy replenishment combustion system through a return material device. The sensible heat of the coke powder is used to bring it to the ignition temperature, and the hot flue gas generated by combustion is introduced into the dry quenching furnace circulating flue gas system. Energy is recovered by combining the waste heat boiler and circulating fan. Solid waste such as coke powder from secondary dust removal is used as fuel. An electric regulating valve is configured to regulate the flue gas temperature and oxygen content.
This approach effectively utilizes the sensible heat of coke powder, increases the steam output and power generation of waste heat boilers, reduces the risk of equipment damage, improves the production load and power generation efficiency of dry quenching, and achieves the dual benefits of solid waste resource utilization and energy value-added.
Smart Images
Figure CN224377959U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of energy replenishment device technology, and in particular to an energy replenishment device for a dry quenching system. Background Technology
[0002] Dry quenching technology, an advanced process that utilizes inert gas to cool hot coke and recover waste heat, exhibits significant advantages in energy saving and environmental protection compared to traditional water quenching methods, and has become the mainstream technology in the quenching process of coking production. In the dry quenching process, primary dust removal typically employs a settling gravity dust collector or a cyclone dust collector. The flue gas at approximately 950°C from the dry quenching furnace outlet enters the primary dust collector, and the collected high-temperature coke powder (850°C–900°C) is mostly cooled to below 200°C using water-cooled jackets in China, and then transported to the ash silo for storage via pneumatic conveying devices or scraper conveyors. However, water-cooled jackets using circulating water as the cooling medium have many drawbacks. They not only fail to effectively utilize the sensible heat of the coke powder, but also cause a decrease in heat exchange efficiency after scaling, affecting the cooling effect of the coke powder. Furthermore, the entry of high-temperature coke powder into the ash silo poses a safety hazard.
[0003] The coke dust collected during the secondary dust removal process in dry quenching is stored in the ash hopper at the bottom of the dust collector and then conveyed to the ash silo via a pneumatic conveying device or scraper conveyor. A humidifier or suction / extraction device is installed at the bottom of the ash silo to periodically transport the coke dust off-site for general solid waste treatment. Most coking plants sell this as ordinary fuel at low prices, which not only wastes energy but also pollutes the environment. Furthermore, dry quenching produces a large amount of coke dust compared to wet quenching, accounting for approximately 2% of the coke processed. While integrated steel enterprises can utilize this dust through blast furnace injection, independent coking plants often only treat it as general solid waste with simple humidification before selling it off-site, easily leading to environmental problems such as dust spillage. Therefore, the resource utilization of dry quenching coke dust has become a pressing problem for independent coking plants.
[0004] With increasingly stringent environmental protection requirements, some regions have run out of space for wet quenching coke production, making dry quenching production an inevitable trend. However, enterprises using dry quenching production only achieve an overall utilization rate of 50% to 70%. Low-load operation leads to a series of production and equipment problems, such as shortened lifespan of boilers, secondary dust collectors, and fans in the dry quenching system, and reduced power generation efficiency. In view of this, this utility model proposes a supplementary energy device for a dry quenching coke system. Utility Model Content
[0005] The purpose of this invention is to address the problems in the background technology, such as the waste of sensible heat from dry quenching coke powder, the complexity of the processing procedure and the potential safety and environmental hazards, as well as the decline in equipment lifespan and power generation efficiency due to low-load operation in full dry quenching production. This invention proposes a supplementary energy device for a dry quenching coke system.
[0006] The technical solution of this utility model is as follows: A supplementary energy device for a dry quenching coke system, comprising a dry quenching furnace; a dust collector connected to the output end of the dry quenching furnace via a pipeline, one output end of the dust collector being connected to a return material device, the return material device being connected to a supplementary energy combustion system via a pipeline, the supplementary energy combustion system being connected to the dry quenching furnace via a pipeline; a waste heat boiler, the output end of which is connected to the dry quenching furnace via a pipeline, and a circulating fan and an auxiliary economizer are installed on the circulating flue, the other output end of the dust collector being connected to the waste heat boiler via a pipeline.
[0007] Optionally, the supplementary combustion system is connected to a blower via a pipeline, and the supplementary combustion system is connected to a hopper via a feeding device.
[0008] Optionally, the return device is non-mechanical, and is U-shaped or L-shaped.
[0009] Optionally, the return material device uses depressurized compressed air as the conveying medium.
[0010] Optionally, the return device is controlled by the material level; it returns material when the material level is high and stops when the material level is low.
[0011] Optionally, the blower's intake pipe is connected to a VOCs gas pipe to serve as the oxygen source for the supplementary combustion system.
[0012] Optionally, the supplementary combustion system includes an isobaric gas chamber, a combustion device, and a settling chamber. The location where the hot flue gas generated by the supplementary combustion system is introduced into the dry quenching furnace is not limited to the annular air duct and other high-temperature parts of the dry quenching system. The supplementary combustion system has a desulfurization function.
[0013] Optionally, the combustion device employs a staged air distribution system, providing the air required for coke combustion through multiple airflows arranged at different heights at the top of the device. This ensures stable combustion and, due to the uniform overall temperature distribution, helps reduce NOx emissions. X emission.
[0014] Optionally, the silo stores coke powder from secondary dust removal, environmental dust removal ash, pulverized coal, and biomass pellets, which are used as fuel for the supplementary combustion system.
[0015] Optionally, an electric regulating valve is installed on the pipeline between the supplementary combustion system and the dry quenching furnace, and a cold air duct is connected to the electric regulating valve.
[0016] In summary, this application includes at least one of the following beneficial technical effects:
[0017] This invention utilizes a return material device to directly transport high-temperature coke powder (850℃~900℃) collected by the dust collector to the supplementary combustion system. The sensible heat of the coke powder itself is used to bring it to its ignition temperature. Compared to the waste of sensible heat caused by traditional water-cooled jacket cooling of coke powder, this design achieves the conditions for coke powder combustion without additional energy. Simultaneously, the combustion generates hot flue gas at 850℃~1000℃, simultaneously converting the chemical energy and sensible heat of the coke powder into thermal energy. This thermal energy is then introduced into the dry quenching furnace circulating flue gas system, significantly increasing the steam output of the waste heat boiler and the power generation of the steam turbine. Furthermore, the combustion system is equipped with a silo that can simultaneously utilize carbonaceous solid waste such as coke powder from secondary dust removal, environmental dust ash, pulverized coal, and biomass pellets as fuel, further expanding the scope of energy recovery, reducing the enterprise's dependence on external fuels, and achieving the dual benefits of "solid waste resource utilization + energy value-added."
[0018] Furthermore, by linking the electric regulating valve with the cold air duct, the temperature and oxygen content of the hot flue gas can be precisely adjusted to avoid equipment damage caused by excessive flue gas temperature or abnormal oxygen content in the dry quenching system. At the same time, the production load of the dry quenching system can be increased to ensure the lifespan of equipment such as boilers and fans and the power generation efficiency.
[0019] In summary, this utility model achieves comprehensive benefits in terms of energy saving, efficiency improvement, environmental protection, safety, and stable operation of the dry quenching coke system, increases the production load of the dry quenching system, and ensures the lifespan and power generation efficiency of equipment such as boilers and fans. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the energy replenishment device in a dry quenching system.
[0021] Figure label:
[0022] 1. Dry quenching furnace; 2. Dust collector; 3. Waste heat boiler; 4. Return material device; 5. Replenishment combustion system; 6. Blower; 7. Material silo; 8. Electric regulating valve; 9. Circulating fan; 10. Subsidiary economizer. Detailed Implementation
[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0024] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of 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 to illustrate selected embodiments of the invention.
[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] Example:
[0029] like Figure 1 As shown, the present invention proposes a recharge device for a dry quenching coke system, comprising a dry quenching furnace 1. Red-hot coke enters the dry quenching furnace 1 via a hoist and a loading device. Circulating gas enters the dry quenching tank through a blower at the bottom of the dry quenching furnace 1 to exchange heat with the coke. The red-hot coke is cooled to below 200°C and discharged via a coke discharge device. The dry quenching furnace 1 is existing technology and will not be described in detail here.
[0030] Furthermore, the aforementioned energy replenishment device also includes a dust collector 2 connected to the output end of the dry quenching furnace 1 via a pipeline. The dust collector 2 is a gravity settling dust collector or a cyclone dust collector. The high-temperature coke powder collected by the dust collector 2 at 850℃~900℃ has a temperature higher than the ignition point of coke powder and can burn upon contact with oxygen. The hot coke powder can be returned to absorb its sensible heat, ensuring the combustion effect of the coke powder. One output end of the dust collector 2 is connected to a return device 4. The return device 4 is non-mechanical, U-shaped or L-shaped, and has a material sealing function, effectively isolating the dust collector 2 from the energy replenishment combustion system 5. 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 efficiency of the dust collector 2, and preventing secondary entrainment. The return material device 4 uses depressurized compressed air as the conveying medium. The compressed air enters the device through the air chamber at the bottom of the return material device 4 to fluidize the coke powder. The coke powder flows through the chute to the supplementary combustion system 5. The feed rate is adjusted by regulating the amount of compressed air. The return material device 4 is controlled by the material level; it returns material when the material level is high and stops when the material level is low.
[0031] The return material device 4 is connected to the supplementary combustion system 5 through a pipeline. The supplementary combustion system 5 includes an isobaric gas chamber, a combustion device, and a settling chamber. After the coke powder is burned in the combustion device, the hot flue gas passes through the settling chamber to remove large dust particles and enters the dry quenching furnace 1 through a pipeline. The location where the hot flue gas generated by the supplementary combustion system 5 is introduced into the dry quenching furnace 1 is not limited to the annular air duct and other high-temperature parts of the dry quenching coke system.
[0032] The supplementary combustion system 5 uses a staged air distribution method, providing the air required for coke combustion through multiple airflows arranged at different heights above the combustion device. This ensures stable combustion, and the uniform overall temperature distribution helps reduce NO. X emission.
[0033] The supplementary combustion system 5 has a desulfurization function, which effectively controls the SO2 concentration in the flue gas by injecting calcium into the system. The supplementary combustion system 5 is connected to the dry quenching furnace 1 through a pipeline. The hot flue gas of 850℃~1000℃ generated by the supplementary combustion system 5 enters the dry quenching furnace 1 through the pipeline, and is further decomposed by the dust collector 2. The gas then enters the waste heat boiler 3 to generate steam for steam turbine power generation.
[0034] An electric regulating valve 8 is installed on the pipeline between the supplementary combustion system 5 and the dry quenching furnace 1. The electric regulating valve 8 is connected to a cold air duct, allowing the hot flue gas temperature of the supplementary combustion system 5 to be adjustable within the range of 850℃ to 1000℃. The electric regulating valve 8 adjusts the amount of cold air to ensure the hot flue gas temperature and oxygen content, thus ensuring the safety and stability of the dry quenching system. The electric regulating valve 8 controls the hot temperature to prevent flue gas overheating while simultaneously meeting the air intake requirements of the dry quenching system.
[0035] The supplementary combustion system 5 is connected to a blower 6 via a pipeline. Air enters the lower pressure chamber of the combustion device through the blower 6 and then enters the combustion device through the air cap. Hot coke powder burns in contact with the air within the combustion device, generating hot flue gas at 850℃~1000℃. The intake pipe of the blower 6 is connected to a VOCs gas pipeline. The VOCs gas is mainly composed of air, with oxygen accounting for 19.2%, which can serve as the oxygen source in the supplementary combustion system 5. Simultaneously, the high-temperature zone of the supplementary combustion system 5 can be used to treat the organic matter in the VOCs gas, further recovering sensible heat. The supplementary combustion system 5 is connected to a silo 7 via a feeding device. The silo 7 stores coke powder from secondary dust removal, environmental dust removal ash, coal powder, and biomass pellets, which are used as fuel for the supplementary combustion system 5 and are fed into the system via the feeding device.
[0036] During the furnace drying stage of the dry quenching furnace 1, by using coal, coke powder and biomass in the silo 7 as fuel, the generated hot flue gas can be used as the heat source for the furnace drying system to achieve energy replenishment, increase system load, prevent low load conditions of equipment, and improve the steam output of the waste heat boiler 3 and the power generation efficiency and power generation of the steam turbine.
[0037] Furthermore, the aforementioned energy replenishment device also includes a waste heat boiler 3. The output end of the waste heat boiler 3 is connected to the dry quenching furnace 1 via a pipeline, and a circulating fan 9 and an auxiliary economizer 10 are installed on the circulating flue. The other output end of the dust collector 2 is connected to the waste heat boiler 3 via a pipeline. The circulating gas discharged from the dry quenching furnace 1 is approximately 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 approximately 170°C.
[0038] In this embodiment, during the coke powder collection and conveying process, red-hot coke enters the dry quenching furnace 1 via an elevator and a loading device. Circulating gas enters from the bottom blower of the dry quenching furnace 1, exchanges heat with the coke to cool the red-hot coke to below 200°C, and then exits. The approximately 980°C circulating gas output from the dry quenching furnace 1 enters the dust collector 2, which collects high-temperature coke powder at 850°C to 900°C. This high-temperature coke powder falls into a non-mechanical return device 4 with a material sealing function, isolating the dust collector 2 from the supplementary combustion system 5, preventing secondary entrainment, and ensuring dust removal efficiency. The return device 4 uses depressurized compressed air to fluidize the coke powder, controls the feed rate by adjusting the air volume, and automatically starts and stops according to the material level, conveying the coke powder to the supplementary combustion system 5.
[0039] In the combustion heat generation stage, within the supplementary combustion system 5, blower 6 delivers air into the lower isobaric chamber and through the air cap into the combustion device. Simultaneously, a VOCs gas pipeline connects to the blower 6's intake pipe, providing oxygen for combustion. High-temperature coke powder from the return material device 4, along with secondary dust-removed coke powder, environmental dust, pulverized coal, and biomass pellets fed into the silo 7 via the feeding device, undergo complete combustion within the combustion device after contacting air, generating hot flue gas at 850℃~1000℃. The hot flue gas first passes through a settling chamber to remove large dust particles before entering the dry quenching furnace 1.
[0040] In the flue gas treatment and utilization stage, the hot flue gas generated by the supplementary combustion system 5 enters the dry quenching furnace 1, and then undergoes further dust removal by the dust collector 2 before entering the waste heat boiler 3. An electric regulating valve 8 connects to a cold air duct on the pipeline between the supplementary combustion system 5 and the dry quenching furnace 1. By adjusting the amount of cold air, the temperature of the hot flue gas is controlled within the range of 850℃ to 1000℃, ensuring that the temperature and oxygen content of the hot flue gas meet the requirements and guaranteeing the safe and stable operation of the dry quenching system. The hot flue gas exchanges heat in the waste heat boiler 3 to generate steam, which is used for steam turbine power generation, achieving energy recovery and utilization.
[0041] In the circulating gas heat exchange stage, the circulating gas discharged from the dry quenching furnace 1 at approximately 980°C is filtered by the dust collector 2 and then enters the waste heat boiler 3. In the waste heat boiler 3, it exchanges heat with other media, and the temperature drops to approximately 170°C. After heat exchange, the circulating gas returns to the dry quenching furnace 1 through pipelines, circulating fans 9, and auxiliary economizer 10, completing the recycling process and continuously providing cooling gas for the dry quenching coke process.
[0042] This energy replenishment device can expand the application scope of dry quenching coke. It can utilize carbon-containing solid waste from multiple industries as fuel for the energy replenishment device, replenishing the dry quenching coke system, generating as much steam and electricity as possible, and improving overall economic efficiency.
[0043] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.
Claims
1. A power replenishment device for a dry quenching system, characterized in that, include: Dry quenching furnace (1); A dust collector (2) is connected to the output end of the dry quenching furnace (1) via a pipe. A return material device (4) is connected to one output end of the dust collector (2). The return material device (4) is connected to a supplementary combustion system (5) via a pipe. The supplementary combustion system (5) is connected to the dry quenching furnace (1) via a pipe. Waste heat boiler (3), the output end of the waste heat boiler (3) is connected to the dry quenching furnace (1) through a pipe, and a circulating fan (9) and an auxiliary economizer (10) are installed on the circulating flue. The other output end of the dust collector (2) is connected to the waste heat boiler (3) through a pipe.
2. The energy replenishment device for a dry quenching system according to claim 1, characterized in that, The supplementary combustion system (5) is connected to a blower (6) via a pipeline, and the supplementary combustion system (5) is connected to a hopper (7) via a feeding device.
3. The energy replenishment device for a 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 replenishment device for a dry quenching system according to claim 3, characterized in that, The return material device (4) uses compressed air after pressure reduction as the conveying medium.
5. The energy replenishment device for a dry quenching system according to claim 4, characterized in that, The return material device (4) controls the material level; it returns material when the material level is high and stops when the material level is low.
6. The energy replenishment device for a dry quenching system according to claim 5, characterized in that, The air intake pipe of the blower (6) is connected to the VOCs gas pipe, serving as the oxygen source for the supplementary combustion system (5).
7. The energy replenishment device for a dry quenching system according to claim 6, characterized in that, The supplementary combustion system (5) includes an isobaric gas chamber, a combustion device, and a settling chamber. The location where the hot flue gas generated by the supplementary combustion system (5) is introduced into the dry quenching furnace (1) is not limited to the annular air duct and other high-temperature parts of the dry quenching system. The supplementary combustion system (5) has a desulfurization function.
8. The energy replenishment device for a dry quenching system according to claim 7, characterized in that, The silo (7) stores coke powder from secondary dust removal, environmental dust removal ash, coal powder and biomass pellets, which are used as fuel for the supplementary combustion system (5).
9. A recharging device for a dry quenching system according to claim 8, characterized in that, An electric regulating valve (8) is installed on the pipeline between the supplementary combustion system (5) and the dry quenching furnace (1), and a cold air pipeline is connected to the electric regulating valve (8).