Blast furnace ironmaking lump coal semi-coking treatment system and process and smelting process system

Abstract

This invention provides a lump coal semi-coking treatment system and process based on blast furnace ironmaking, and a smelting process system, relating to the field of smelting technology. It includes a preheating dry distillation furnace and an in-situ semi-coking module. The preheating dry distillation furnace is used for pre-semi-coking treatment of lump coal. The in-situ semi-coking module includes a high-level silo, two dynamically sealed silos connected in parallel to the high-level silo, a control silo connecting the two dynamically sealed silos, a discharge pipe connecting the control silo, and a feed inlet connected to the discharge pipe and installed on the blast furnace. The high-level silo receives the lump coal treated by the preheating dry distillation furnace. The two dynamically sealed silos can alternately perform venting, loading, pressure equalization, and unloading operations for continuous conveying of lump coal. The lump coal flowing down through the dynamically sealed silos comes into countercurrent contact with the blast furnace gas flowing up through the feed inlet to semi-coke the lump coal. This invention constructs a two-stage processing technology of pre-coking outside the furnace and deep coking inside the furnace through the coordinated operation of a preheating dry distillation furnace and an in-situ semi-coking module. This ensures that the semi-coking reaction of lump coal is sufficient, thereby improving the stability of lump coal after it enters the furnace.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a lump coal semi-coking treatment system and process based on blast furnace ironmaking, and a metallurgical process system. Background Technology

[0002] Blast furnace ironmaking has long relied on coke as its core raw material, but the scarcity of high-quality coking coal resources and high mining costs have become a key bottleneck restricting the high-quality development of the steel industry. At the same time, traditional coking processes are energy-intensive and produce large amounts of SO2 and NO. x The emissions of dust and wastewater are incompatible with the trend of environmentally friendly and low-carbon development. Currently, the technology of replacing part of the coke with pulverized coal injection has reached its limit; further increasing the proportion easily leads to the accumulation of unburned coal powder and deterioration of furnace permeability. To overcome these limitations, the industry has attempted to directly add lump coal from the top of the furnace to replace coke. However, directly adding lump coal to the furnace has significant technical drawbacks: during its descent, it undergoes compression by the material column, low-temperature thermal explosion, and high-temperature dry distillation pulverization, easily leading to deterioration of the material column's permeability and threatening the stable operation of the blast furnace. Specifically, lump coal's high-temperature strength and thermal stability are far lower than metallurgical coke, making it prone to pulverization and breakage under high temperature and pressure conditions in the furnace, affecting permeability and potentially causing abnormal conditions such as material suspension and collapse. Simultaneously, its reactivity and post-reaction strength are mismatched with the blast furnace smelting rhythm, easily reacting prematurely with CO2 for gasification, causing an imbalance in thermodynamics and reduction equilibrium. This not only makes it difficult to effectively replace coke for heating and reduction functions but may also increase fuel consumption and production costs. Nevertheless, from the perspectives of resource strategy, economic benefits, and green and low-carbon development, lump coal remains significant as a substitute for coke. Lump coal can be sourced from low-rank coal types such as semi-coke and non-caking coal, significantly improving the resource utilization rate of low-rank coal and alleviating the supply pressure of high-quality coking coal. Its procurement cost is only 50%-60% of coke, significantly reducing the fuel cost per ton of iron and saving energy consumption and environmental protection investment in the coking process. Furthermore, reducing the coking process directly reduces CO2 and pollutant emissions. Therefore, developing a smelting technology and equipment that can overcome the inherent defects of lump coal and achieve a high-proportion, stable substitution of coke for it, ensuring sufficient semi-coking reaction of lump coal and thus improving its stability after entering the furnace, has become an urgent technical problem to be solved. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a lump coal semi-coking treatment system and process and a smelting process system based on blast furnace ironmaking, so as to ensure that the lump coal semi-coking reaction is sufficient to improve the stability of lump coal after it is fed into the furnace.

[0004] The above-mentioned objective of this invention can be achieved by the following technical solution: This invention provides a lump coal semi-coking treatment system based on blast furnace ironmaking, comprising: A preheating dry distillation furnace, wherein the preheating dry distillation furnace is used for pre-semi-coking treatment of lump coal; The in-situ semi-coking module includes a high-level silo, two dynamically sealed silos connected in parallel to the high-level silo, a control silo connecting the two dynamically sealed silos, a discharge pipe connecting the control silo, and a feed inlet connected to the discharge pipe and used for installation on the blast furnace. The high-level silo is used to receive lump coal processed by the preheating dry distillation furnace. The two dynamically sealed silos can alternately perform venting, loading, pressure equalization, and unloading operations to continuously transport lump coal. The lump coal flowing down through the dynamically sealed silos comes into countercurrent contact with the blast furnace gas flowing up through the feed inlet to semi-coke the lump coal.

[0005] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a flue gas conveying pipeline, which is used to connect the sintering ring cooler and the preheating dry distillation furnace. The flue gas conveying pipeline can convey the flue gas from the sintering ring cooler to the preheating dry distillation furnace for pre-semi-coking treatment of lump coal.

[0006] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a flue gas treatment module disposed on the flue gas conveying pipeline, the flue gas treatment module including at least one of a dust removal and purification device, a temperature regulating device, and a flow control device.

[0007] In a preferred embodiment of the present invention, the preheating carbonization furnace includes a sealable material channel and a conveyor belt disposed in the material channel. The material channel is sequentially divided into a feeding section, a preheating and drying section, a medium-low temperature carbonization section, and a discharging section. The lump coal semi-coking treatment system based on blast furnace ironmaking also includes at least one sealing partition for separating and encapsulating lump coal. The conveyor belt can drive the lump coal in the sealing partition to be conveyed along the feeding section, the preheating and drying section, the medium-low temperature carbonization section, and the discharging section.

[0008] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a flue gas circulation pipeline, an igniter disposed on the flue gas circulation pipeline, and a temperature sensor disposed in the medium-low temperature dry distillation section. The inlet of the flue gas circulation pipeline is connected to the feeding section, and the outlet of the flue gas circulation pipeline is connected to the medium-low temperature dry distillation section. The igniter can burn and heat the circulating flue gas in the flue gas circulation pipeline based on the temperature data of the temperature sensor.

[0009] In a preferred embodiment of the present invention, a buffer tank is further provided on the flue gas circulation pipeline, and at least one flue gas flow regulating valve is provided on the preheating dry distillation furnace. The flue gas flow regulating valve is connected to the flue gas conveying pipeline and the medium-low temperature dry distillation section. The igniter is located downstream of the buffer tank. The flue gas flow regulating valve can adjust the flue gas flow based on the temperature data of the temperature sensor. The igniter can ignite the gas drawn from the buffer tank based on the temperature data of the temperature sensor to maintain the gas within a preset temperature range.

[0010] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a screening device for screening out powder from the lump coal after it has been treated by the preheating dry distillation furnace.

[0011] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a material distribution device disposed on the high-level silo.

[0012] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a storage bin and a bucket elevator. The storage bin is used to store the lump coal processed by the screening device, and the bucket elevator is used to transport the lump coal in the storage bin to the feeding device.

[0013] In a preferred embodiment of the present invention, the high-level silo includes an upper silo body and two lower silos connected to the upper silo body. A weighing feeder is provided at the lower part of each lower silo body, and each lower silo body is connected to one of the dynamic sealed silos.

[0014] In a preferred embodiment of the present invention, the semi-coking module further includes a first material flow regulating valve disposed between the lower silo and the dynamic sealing silo, and a second material flow regulating valve disposed between the dynamic sealing silo and the control silo.

[0015] In a preferred embodiment of the present invention, the semi-coking module further includes a pressure equalization valve and a venting valve connected to the dynamic sealed silo, wherein the pressure equalization valve is used to connect to a pressurized gas source.

[0016] In a preferred embodiment of the present invention, the feed pipe includes an inner pipe for conveying lump coal and a circulating cooling water sleeve sleeved on the outside of the inner pipe.

[0017] In a preferred embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a vibrator connected to the feeding pipe.

[0018] In a preferred embodiment of the present invention, the opening area of ​​the feed inlet gradually increases along the conveying direction of the feed inlet to form a fan shape.

[0019] In a preferred embodiment of the present invention, a guide plate is provided at the bottom of the feed inlet, and the guide plate is inclined downward at 15° to 20°.

[0020] This invention provides a semi-coking process for lump coal, implemented using the aforementioned semi-coking system for lump coal based on blast furnace ironmaking. The semi-coking process for lump coal includes the following steps: Pre-semi-coking lump coal is obtained by preheating, drying and pyrolysis of the lump coal to be treated in a preheating pyrolysis furnace. The pre-semi-coking lump coal is screened and then transported to a high-level silo. Control the two dynamic sealed silos to alternately perform venting, loading, pressure equalization and unloading operations; After being unloaded, the pre-semi-coking lump coal enters the control bin and then enters the blast furnace through the feed pipe and feed inlet. During the unloading operation and entry into the blast furnace, the downward-flowing pre-semi-coking lump coal and the upward-flowing blast furnace gas through the feed inlet form a countercurrent contact, thereby completing the semi-coking process.

[0021] The present invention provides a smelting process system, including a blast furnace and at least one of the aforementioned blast furnace-based semi-coking coal processing systems.

[0022] In a preferred embodiment of the present invention, the lower furnace body of the blast furnace is provided with a plurality of opening stations for installing the feed inlet, and the in-situ semi-coking module of the lump coal semi-coking treatment system based on blast furnace ironmaking is provided with a plurality of such modules, and the feed inlet of each of the in-situ semi-coking modules is correspondingly provided on one of the opening stations.

[0023] The technical solution of the present invention has the following significant beneficial effects: The lump coal semi-coking system based on blast furnace ironmaking described in this invention utilizes a two-stage processing technology—pre-coking outside the blast furnace and in-situ deep semi-coking inside the blast furnace—through the coordinated operation of a preheating retort furnace and an in-situ deep semi-coking module. First, the lump coal undergoes partial volatile matter removal and pore structure reconstruction in the preheating retort furnace, eliminating the risk of volume expansion and thermal explosion caused by the instantaneous release of volatile matter upon entering the furnace. Subsequently, during conveying and entry into the blast furnace, the descending lump coal comes into countercurrent contact with the high-temperature blast furnace gas flowing upwards through the feed inlet, achieving deep carbonization in the stable high-temperature zone at the bottom of the blast furnace, forming high-strength semi-coke. This two-stage semi-coking structure improves the integrity of the lump coal upon entering the furnace from the source, significantly reduces the pulverization rate, and ensures sufficient semi-coking reaction, thereby enhancing the stability of the lump coal after entering the furnace.

[0024] Furthermore, this invention resolves the conflict between the high-pressure environment of the blast furnace and atmospheric pressure charging by setting up two dynamically sealed silos in parallel and having them alternately perform venting, charging, pressure equalization, and unloading operations. This allows for the continuous and stable delivery of semi-coke lump coal to the blast furnace. Moreover, by placing the feed inlet at the bottom of the blast furnace, the lump coal, after entering the blast furnace through the feed inlet, only needs to pass through a short material layer from above the softening zone to the hearth. This effectively avoids the long-distance compression and breakage problems of lump coal in the upper material column under traditional top charging methods. The resulting semi-coke possesses good structural strength and can partially replace coke in fulfilling the function of the material column skeleton, thus ensuring the blast furnace's permeability and liquid permeability. This provides a crucial structural foundation for a high proportion of lump coal replacing coke.

[0025] Furthermore, the coal semi-coking system described in this invention possesses high integration and ease of modification. The in-situ semi-coking module adopts a modular design, allowing for the addition of feed inlets to the lower part of the existing blast furnace without the need for complete reconstruction of the blast furnace itself. This results in low modification difficulty and controllable investment costs. Based on this, the blast furnace can incorporate a high proportion of lump coal, which is significantly cheaper than coke, thus substantially reducing the fuel cost per ton of iron. Simultaneously, it reduces energy consumption, pollutant emissions, and carbon emissions associated with the coking process, achieving a balance between economic and environmental benefits and demonstrating promising prospects for industrial application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0028] Figure 1 This is a schematic diagram of an embodiment of the lump coal semi-coking treatment system based on blast furnace ironmaking according to the present invention; Figure 2 This is a top view of one embodiment of the guide plate of the feed inlet described in this invention.

[0029] The reference numerals in the above figures are as follows: 10. Blast furnace; 20. Preheating area; 30. Heating zone; 40. Carbonization and volatilization zones; 50. Pressurized air source; 60. Sintering ring cooler; 100. Preheating dry distillation furnace; 101. Feeding section; 102. Preheating and drying section; 103. Medium and low temperature dry distillation section; 104. Discharge section; 110. Conveyor belt; 120. Sealing baffle; 130. Flue gas flow regulating valve; 200. In-situ semi-coking module; 210. High-level silo; 220. Dynamically sealed silo; 221. Pressure equalizing valve; 222. Venting valve; 230. Control silo; 240. Feed pipe; 250. Feed inlet; 251. Guide plate; 260. Material distribution device; 270. Weighing feeder; 280. First material flow regulating valve; 290. Second material flow regulating valve; 300. Flue gas conveying pipeline; 310. Flue gas treatment module; 400. Flue gas recirculation pipeline; 410. Ignition nozzle; 420. Buffer tank; 500. Storage warehouse; 600. Bucket Elevator. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Implementation Method 1

[0032] Please refer to the following: Figure 1 As shown, an embodiment of the present invention provides a lump coal semi-coking treatment system based on blast furnace ironmaking. This system includes a preheating dry distillation furnace 100 and an in-situ semi-coking module 200. The preheating dry distillation furnace 100 is used for pre-semi-coking treatment of lump coal. The in-situ semi-coking module 200 includes a high-level silo 210, two dynamically sealed silos 220 connected in parallel to the high-level silo 210, and a control silo 2 connecting the two dynamically sealed silos 220. 30. A discharge pipe 240 connecting the control silo 230 and a feed inlet 250 connected to the discharge pipe 240 and installed on the blast furnace 10. A high-level silo 210 is used to receive lump coal after it has been processed by the preheating dry distillation furnace 100. Two dynamic sealed silos 220 can alternately perform venting, loading, pressure equalization and unloading operations to continuously transport lump coal. The lump coal flowing down through the dynamic sealed silos 220 comes into countercurrent contact with the blast furnace gas flowing up through the feed inlet 250 to semi-coke the lump coal.

[0033] Overall, this blast furnace ironmaking-based lump coal semi-coking system utilizes a two-stage processing technology—external pre-coking and internal in-situ deep semi-coking—through the coordinated operation of the preheating retort furnace 100 and the in-situ semi-coking module 200. The lump coal first undergoes partial volatile matter removal and pore structure reconstruction in the preheating retort furnace 100, eliminating the risk of volume expansion and thermal explosion caused by the instantaneous release of volatile matter upon entering the furnace. Subsequently, during conveying and entry into the blast furnace 10, the descending lump coal comes into countercurrent contact with the high-temperature blast furnace gas flowing upwards through the feed inlet 250, achieving deep carbonization in the stable high-temperature zone at the bottom of the furnace, forming high-strength semi-coke. This two-stage semi-coking structure improves the integrity of the lump coal upon entering the furnace from the source, significantly reduces the pulverization rate, and ensures sufficient semi-coking reaction, thereby enhancing the stability of the lump coal after entering the furnace.

[0034] Furthermore, this invention resolves the conflict between the high-pressure environment and atmospheric pressure charging in blast furnace 10 by setting up two dynamic sealed silos 220 in parallel and having them alternately perform venting, charging, pressure equalization, and unloading operations. This allows for the continuous and stable delivery of semi-coke lump coal to blast furnace 10. Moreover, by placing the feed inlet 250 at the lower part of the blast furnace 10, the lump coal, after entering the blast furnace 10 through the feed inlet 250, only needs to pass through a short material layer from above the softening zone to the hearth. This effectively avoids the problem of long-distance compression and breakage of lump coal in the upper material column under traditional top charging methods. The resulting semi-coke possesses good structural strength and can partially replace coke in fulfilling the function of the material column skeleton, thus ensuring the air permeability and liquid permeability of blast furnace 10. This provides a crucial structural foundation for a high proportion of lump coal replacing coke.

[0035] Furthermore, the coal semi-coking system described in this invention possesses high integration and ease of modification. The in-situ semi-coking module 200 adopts a modular design, allowing for the addition of a feed inlet 250 to the lower part of the existing blast furnace 10 without the need for complete reconstruction of the blast furnace 10 itself. This reduces modification difficulty and controllable investment costs. Based on this, the blast furnace 10 can incorporate a high proportion of lump coal, which has a significantly lower cost than coke, thereby substantially reducing the fuel cost per ton of iron. Simultaneously, it reduces energy consumption, pollutant emissions, and carbon emissions associated with the coking process, achieving a balance between economic and environmental benefits and demonstrating promising prospects for industrial application.

[0036] Specifically, during the pre-coking process outside the furnace, 20%-30% of the volatile matter in the lump coal is removed at 500℃-600℃ to avoid the risk of volume expansion caused by the instantaneous release of a large amount of volatile matter later. During the in-situ deep coking process inside the furnace, the stable temperature range (approximately 900℃-1000℃) at the bottom of the lumpy zone and above the softening zone of blast furnace 10 is utilized to allow the downward-flowing lump coal to come into countercurrent contact with the upward-flowing high-temperature blast furnace gas to complete the deep coking process, achieving a volatile matter removal rate of ≥90% and forming high-strength semi-coke. The dynamic sealed silo 220 serves as the preheating zone 20, the controlled silo 230 serves as the heating zone 30, and the feed pipe 240 serves as the carbonization and volatilization zone 40.

[0037] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a flue gas conveying pipeline 300, which is used to connect the sintering ring cooler 60 and the preheating dry distillation furnace 100. The flue gas conveying pipeline 300 can convey the flue gas from the sintering ring cooler 60 to the preheating dry distillation furnace 100 for pre-semi-coking treatment of lump coal.

[0038] Specifically, the preheating dry distillation furnace 100 is equipped with multiple flue gas inlets, and the flue gas conveying pipeline 300 is connected to each flue gas inlet to input the cold flue gas from the sintering ring into the preheating dry distillation furnace 100.

[0039] By setting up a flue gas conveying pipeline 300 to connect the sintering ring cooler 60 and the preheating dry distillation furnace 100, the high-temperature waste flue gas (approximately 550℃-750℃) from the first stage of the sintering ring cooler 60 can be used as a heat source for the low-temperature pre-semi-coking treatment of lump coal, thereby achieving efficient recovery and utilization of waste heat from the sintering process, reducing the consumption of external heat sources, and improving the overall energy utilization efficiency.

[0040] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a flue gas treatment module 310 installed on the flue gas conveying pipeline 300. The flue gas treatment module 310 includes at least one of a dust removal and purification device, a temperature regulation device, and a flow control device.

[0041] Preferably, the flue gas treatment module 310 includes a dust removal and purification device, a temperature regulation device, and a flow control device. By installing the dust removal and purification device, the temperature regulation device, and the flow control device on the flue gas conveying pipeline 300, the sintering ring cold flue gas entering the preheating dry distillation furnace 100 can be dust removed and purified to protect the equipment and avoid cross-contamination. The temperature regulation device precisely controls the temperature of the flue gas entering the furnace, and the flow control device stably regulates the flue gas flow to ensure a uniform thermal field, thus ensuring precise temperature control and process stability for lump coal preheating and drying (approximately 150℃-250℃) and medium-low temperature dry distillation (approximately 500℃-600℃).

[0042] In an embodiment of the present invention, the preheating dry distillation furnace 100 includes a sealable material channel and a conveyor belt 110 disposed in the material channel. The material channel is sequentially divided into a feeding section 101, a preheating and drying section 102, a medium-low temperature dry distillation section 103, and a discharge section 104. The lump coal semi-coking treatment system based on blast furnace ironmaking also includes at least one sealing partition 120 for separating and wrapping lump coal. The conveyor belt 110 can drive the lump coal in the sealing partition 120 to be conveyed along the feeding section 101, the preheating and drying section 102, the medium-low temperature dry distillation section 103, and the discharge section 104.

[0043] By setting up a conveyor belt 110 (conveyor speed 0.5m / min-2m / min) to drive the lump coal in the sealed partition 120 along the feeding section 101, the preheating and drying section 102, the medium and low temperature dry distillation section 103, and the discharge section 104, the lump coal can complete the continuous processing of preheating and drying, medium and low temperature dry distillation (residence time about 25min-35min) and cooling in sequence.

[0044] The sealing partition 120 separates and wraps the lump coal, and uses indirect heat exchange to achieve heat transfer, ensuring that the flue gas and lump coal do not come into contact with each other, avoiding cross-contamination, and at the same time ensuring the stability of the weakly inert atmosphere inside the device.

[0045] Specifically, the preheating and drying section 102 preheats the lump coal temperature from room temperature to 150-250℃ through heat conduction, removing more than 80% of the external moisture and some of the crystal water from the lump coal, thus preventing the lump coal from thermally exploding due to rapid evaporation of moisture during the subsequent dry distillation process; the medium-low temperature dry distillation section 103 gradually raises the lump coal temperature to 500-600℃, with a residence time of 25 min-35 min, completing the medium-low temperature dry distillation reaction of the lump coal within this temperature range, removing 20%-30% of the volatile matter from the lump coal, while simultaneously reconstructing the internal pore structure and improving the strength of the lump coal.

[0046] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a flue gas circulation pipeline 400, an igniter 410 disposed on the flue gas circulation pipeline 400, and a temperature sensor disposed in the medium-low temperature dry distillation section 103. The inlet of the flue gas circulation pipeline 400 is connected to the feed section 101, and the outlet of the flue gas circulation pipeline 400 is connected to the medium-low temperature dry distillation section 103. The igniter 410 can burn and heat the circulating flue gas in the flue gas circulation pipeline 400 based on the temperature data of the temperature sensor.

[0047] By setting up a flue gas circulation pipeline 400, an igniter 410, and a temperature sensor installed in the medium-low temperature dry distillation section 103, the flue gas containing volatile gases (methane, hydrogen, carbon monoxide, etc.) from the feed section 101 of the preheating dry distillation furnace 100 is circulated back to the medium-low temperature dry distillation section 103 for combustion and heating, thereby realizing the resource utilization of self-produced combustible gas and reducing the consumption of external heat sources.

[0048] Furthermore, the temperature sensor monitors the dry distillation temperature in real time and links it with the igniter 410 to ensure that the temperature of the medium-low temperature dry distillation section 103 remains stable within the set range of 500℃-600℃, thus ensuring the consistency of the pre-semi-coking effect of lump coal.

[0049] In an embodiment of the present invention, a buffer tank 420 is also provided on the flue gas circulation pipeline 400, and at least one flue gas flow regulating valve 130 is provided on the preheating dry distillation furnace 100. The flue gas flow regulating valve 130 is connected to the flue gas conveying pipeline 300 and the medium and low temperature dry distillation section 103. The igniter 410 is located downstream of the buffer tank 420. The flue gas flow regulating valve 130 can regulate the flue gas flow based on the temperature data of the temperature sensor. The igniter 410 can ignite the gas drawn from the buffer tank 420 based on the temperature data of the temperature sensor to keep the gas within a preset temperature range.

[0050] By installing a buffer tank 420 on the flue gas circulation pipeline 400, the gas source pressure and composition can be stabilized; by installing a flue gas flow regulating valve 130 on the preheating dry distillation furnace 100, the flue gas flow regulating valve 130 connects the flue gas conveying pipeline 300 and the medium and low temperature dry distillation section 103, thereby realizing flue gas flow regulation.

[0051] Furthermore, by setting a temperature sensor, the temperature sensor can be linked with the flue gas flow regulating valve 130 to dynamically adjust the flue gas flow and control the igniter 410 to ignite the gas drawn from the buffer tank 420 for ignition and temperature control, thereby realizing precise closed-loop control of the temperature of the medium and low temperature dry distillation section 103, ensuring that the dry distillation temperature remains stable in the preset range of 500℃-600℃ for a long time, and improving the quality stability of lump coal pre-coking.

[0052] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a screening device for screening out powder from the lump coal after it has been treated by the preheating dry distillation furnace 100.

[0053] By setting up a screening device, the temperature of the upgraded lump coal is reduced to below 100℃ by indirect cooling with ambient air in the discharge section 104 of the preheating dry distillation furnace 100 to prevent the high-temperature lump coal from oxidizing and deteriorating during subsequent transportation. It can also screen out a small amount of powder generated during the dry distillation process, ensuring the uniformity of the lump coal particle size, avoiding the powder from entering the subsequent in-situ semi-coking system and blast furnace 10 with the lump coal, reducing the amount of dust in blast furnace 10, and preventing the powder from deteriorating the permeability of the feed column.

[0054] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a material distribution device 260 disposed on a high-level silo 210. Designers can adjust the specific shape and structure of the material distribution device 260 according to usage needs, and no specific limitations are imposed here. Preferably, the material distribution device 260 can rotate 360° and can tilt at varying angles.

[0055] By installing a material distribution device 260 on the high-level silo 210, the pre-semi-coking lump coal can be evenly distributed into the high-level silo 210, and the landing point of the furnace charge can be controlled, avoiding material segregation and local accumulation, ensuring the flatness of the material level in the high-level silo 210, and providing a uniform material base for subsequent weighing feeding and stable feeding of the dynamic sealed silo 220.

[0056] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking further includes a storage bin 500 and a bucket elevator 600. The storage bin 500 is used to store lump coal after it has been processed by the screening device, and the bucket elevator 600 is used to transport the lump coal in the storage bin 500 to the feeding device 260.

[0057] By setting up a storage bin 500 and a bucket elevator 600, the storage bin 500 serves as a transfer buffer between the preheating dry distillation furnace 100 and the in-situ semi-coking module 200, which can balance the capacity difference between the front and rear processes and avoid the impact of fluctuations in the pretreatment section on the continuous feeding of the blast furnace 10; the bucket elevator 600 realizes the vertical transportation of lump coal to the material distribution device 260, with a compact structure and flexible layout.

[0058] In an embodiment of the present invention, the high-level silo 210 includes an upper silo body and two lower silos connected to the upper silo body. A weighing feeder 270 is provided at the lower part of the lower silos body, and each lower silo body is connected to a dynamic sealed silo 220.

[0059] By setting the high-level silo 210 as an upper silo connected to two lower silos, and setting a weighing feeder 270 under each lower silo and independently connecting it to a dynamic sealed silo 220, independent feeding of dual branches is achieved; the weighing feeder 270 has a metering accuracy of ±0.5% and a deviation of ≤2%, and can accurately adjust the feed rate, ensuring the accuracy of the feed rate and avoiding the impact of feed rate fluctuations on the stable operation of blast furnace 10.

[0060] In an embodiment of the present invention, the semi-coking module further includes a first material flow regulating valve 280 disposed between the lower silo and the dynamic sealing silo 220, and a second material flow regulating valve 290 disposed between the dynamic sealing silo 220 and the control silo 230.

[0061] By setting a first material flow regulating valve 280 between the lower silo and the dynamic sealed silo 220, the loading speed and flow rate can be controlled. By setting a second material flow regulating valve 290 between the dynamic sealed silo 220 and the control silo 230, the unloading speed and flow rate can be controlled, thus realizing independent and precise control of the loading speed and unloading speed of the dynamic sealed silo 220.

[0062] In an embodiment of the present invention, the semi-coking module further includes a pressure equalization valve 221 and a venting valve 222 connected to the dynamic sealed silo 220, wherein the pressure equalization valve 221 is used to connect to the pressurized gas source 50.

[0063] By setting a pressure equalization valve 221 and a venting valve 222 in the dynamic sealed hopper 220, the pressure is released to atmospheric pressure before charging to complete the charging process, and the pressure is equalized and pressurized to the pressure inside the blast furnace 10 before unloading to ensure smooth unloading. This solves the pressure matching problem between the high-pressure environment of the blast furnace 10 and the atmospheric pressure charging, and provides a key structural foundation for the continuous and stable delivery of lump coal into the high-pressure blast furnace 10.

[0064] Designers may adjust the specific type of pressurized gas source 50 according to usage requirements, and no specific restrictions are imposed here. Preferably, the pressurized gas source 50 is nitrogen or clean blast furnace gas.

[0065] Specifically, the alternating operation process of the dynamic sealed silo 220 includes four steps: charging preparation, charging, pressure equalization, and unloading. The first step involves releasing pressure to prepare for charging. The target dynamic sealed silo 220 opens its release valve 222 to release the high-pressure gas inside, reducing the pressure inside the silo to atmospheric pressure. The second step involves closing the release valve 222 and opening the first material flow regulating valve 280, connecting the dynamic sealed silo 220 to the high-level silo 210 for charging. After charging is completed, the first material flow regulating valve 280 is closed, and the dynamic sealed silo 220 is restored to a sealed state. The third step involves equalizing and pressurizing. The equalization valve 221 is opened to introduce nitrogen or clean blast furnace gas into the dynamic sealed silo 220, raising the pressure inside the silo 220 to the same level as the pressure inside the blast furnace 10. The fourth step involves unloading. The second material flow regulating valve 290 is opened, and the furnace charge flows into the controlled material silo 230. Two dynamic sealed hoppers alternately cycle: when the left hopper is unloading, the right hopper simultaneously completes the venting, loading, and pressure equalization; after the left hopper is unloading, the right hopper immediately unloads, achieving seamless switching and ensuring continuous and stable material feeding.

[0066] In an embodiment of the present invention, the feed pipe 240 includes an inner pipe for conveying lump coal and a circulating cooling water sleeve sleeved on the outside of the inner pipe.

[0067] Preferably, the inclination angle of the feed pipe 240 is ≥45°. By tilting the feed pipe 240, smooth feeding can be ensured. By configuring the feed pipe 240 with an inner pipe for conveying lump coal and an outer sleeve for circulating cooling water, the feed pipe 240 is forcibly cooled by circulating cooling water. This prevents the feed pipe 240 from overheating and burning or deforming due to heat conduction from high-temperature lump coal and high-temperature coal gas (900℃-1000℃), ensuring the long-term reliability and safety of the equipment.

[0068] Designers can adjust the specific material of the inner tube according to the usage requirements, and no specific restrictions are imposed here. For example, the inner tube can be made of high-temperature resistant and wear-resistant alloy steel.

[0069] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking also includes a vibrator connected to the feeding pipe 240. By setting up a vibrator connected to the feeding pipe 240, when the feeding pipe 240 becomes blocked or experiences abnormal pressure, the vibrator can be immediately activated to clear the blockage, avoiding feeding interruptions or furnace condition fluctuations caused by blockage of the feeding pipe 240, thereby improving the reliability of system operation and emergency response capabilities.

[0070] In an embodiment of the present invention, the opening area of ​​the feed inlet 250 gradually increases along the conveying direction to form a fan shape. By setting the feed inlet 250 into a fan-shaped structure with a gradually increasing opening area along the conveying direction, i.e., a variable cross-section design, a feed inlet 250 with a narrow inlet and a wide outlet is formed. Designers can adjust the angle range of the fan shape according to usage needs, and no specific limitation is made here. For example, the angle of the fan shape is 120°.

[0071] The fan-shaped feed inlet 250 can diffuse the concentrated bundle of material into a fan-shaped material curtain, so that the lump coal can be evenly distributed in the radial range inside the furnace when it enters the blast furnace 10. The material flow coverage range is from the edge of the furnace wall to 2 / 3 of the radius of the blast furnace 10, which avoids the material flow from accumulating on the furnace wall and improves the uniformity of the distribution of lump coal in the blast furnace 10.

[0072] Optionally, an airflow nozzle is also provided at the feed inlet 250. The airflow nozzle is used to spray clean blast furnace gas. The spraying direction is oblique to the center of the furnace and in the same direction as the material flow, so as to assist the lump coal to disperse towards the center. At the same time, the clean blast furnace gas can improve the indirect reduction efficiency of the blast furnace.

[0073] In embodiments of the present invention, such as Figure 2 In the embodiment shown, a guide plate 251 is provided at the bottom of the feed inlet 250, and the guide plate 251 is inclined downward at 15° to 20°.

[0074] By setting the guide plate 251 at the bottom of the feed inlet 250 to be inclined downward at 15° to 20° and facing the center of the blast furnace 10, it helps to guide the lump coal flow towards the center of the blast furnace 10 while it diffuses, further promoting the dispersion of lump coal towards the central area and avoiding accumulation at the edges. Combined with the operation system of increasing coke weight in the center and reducing coke weight at the edges when charging at the top of the furnace, increasing coke weight in the center improves the permeability of the center, while reducing coke weight and adding ore at the edges reduces the feeding speed at the edges, forming a trend of fast feeding in the center and slow feeding at the edges. This allows the lump coal to be actively carried and pulled into the center by the central material flow, giving full play to its function of replacing coke.

[0075] In an embodiment of the present invention, the lump coal semi-coking treatment system based on blast furnace ironmaking also includes a safety control system. The safety control system includes a gas safety protection unit and a cooling safety unit: the gas safety protection unit is equipped with a distributed CO online monitor, and all sealing points are equipped with emergency shut-off valves and a nitrogen emergency purging system. When the CO concentration exceeds the standard, an audible and visual alarm is immediately triggered, the feed is cut off, and nitrogen purging is initiated. It is also interlocked with the plant-wide gas monitoring system and is equipped with a gas emergency flare for safe pressure relief and discharge in extreme situations. The cooling safety unit has independent water supply circuits for the cooling walls at the openings and the cooling sleeves of the feed pipe 240. It is equipped with an emergency water replenishment system to maintain cooling water supply for more than 2 hours in the event of a water outage. All cooling circuits are equipped with online monitoring of flow rate, temperature, and pressure. When the flow rate is low or the temperature is too high, an alarm is automatically triggered and the water supply is increased.

[0076] The safety control system also includes a monitoring and interlocking control module, which includes distributed temperature, pressure, strain, and CO concentration monitoring units, as well as an emergency cut-off and nitrogen purging unit interlocked with the feeding module and the blast furnace main control system, to achieve real-time monitoring and interlocking control of feed rate, furnace status, and gas safety.

[0077] Implementation Method 2

[0078] An embodiment of the present invention provides a semi-coking process for lump coal, implemented using a lump coal semi-coking system based on blast furnace ironmaking as described in Embodiment 1. The lump coal semi-coking process includes the following steps: Step S1: The lump coal to be processed is preheated, dried and pyrolyzed in a preheating pyrolysis furnace 100 to obtain pre-semi-coking lump coal; Step S2: After screening, the pre-semi-coking lump coal is conveyed to the high-level silo 210; Step S3: Control the two dynamic sealed hoppers 220 to alternately perform venting, loading, pressure equalization and unloading operations; Step S4: After unloading, the pre-semi-coking lump coal enters the control silo 230, and then enters the blast furnace 10 through the feed pipe 240 and the feed inlet 250; Step S5: During the unloading operation and entry into blast furnace 10, the downward-flowing pre-semi-coking lump coal and the upward-flowing blast furnace gas through feed inlet 250 form a countercurrent contact, thereby completing the semi-coking process.

[0079] Specifically, the preheated coal is first preheated and dried (150℃-250℃) and then subjected to medium-low temperature carbonization (500℃-600℃, residence time 25-35min) in a preheating carbonization furnace 100 to obtain pre-semi-coking lump coal. After screening, it is transported to a high-level silo 210. Two dynamic sealed silos 220 are controlled to alternately perform venting, loading, pressure equalization and unloading operations. After unloading, the pre-semi-coking lump coal enters the control silo 230, and then enters the blast furnace 10 through the feed pipe 240 and the fan-shaped feed inlet 250. During the unloading and feeding process, the downward-flowing lump coal and the upward-flowing blast furnace gas (900℃-1000℃) through the feed inlet 250 form a countercurrent contact to complete deep semi-coking (volatile matter removal rate ≥90%), forming a complete two-stage processing flow of "external low temperature pre-semi-coking + internal high temperature in-situ semi-coking", ensuring that the semi-coking reaction of the lump coal is sufficient and improving the stability of the lump coal after entering the furnace from the source.

[0080] Implementation Method 3

[0081] An embodiment of the present invention provides a blast furnace 10 smelting system, including a blast furnace 10 and at least one lump coal semi-coking treatment system based on blast furnace ironmaking as described in Embodiment 1. The specific structure and beneficial effects of this lump coal semi-coking treatment system based on blast furnace ironmaking are the same as those described in Embodiment 1, and will not be repeated here.

[0082] By integrating the lump coal semi-coking treatment system based on blast furnace ironmaking with blast furnace 10 into the blast furnace 10 smelting system, blast furnace 10 can directly obtain a continuous and stable supply of pre-semi-coking lump coal. After deep semi-coking, the coal is used to complete the smelting process with high-temperature gas at 900℃-1000℃ between the bottom of the furnace body, the bottom of the lump zone and the top of the softening zone, replacing part of the coke to perform the functions of reducing agent, heat source, skeleton and carburizing agent.

[0083] When adopting the smelting process system, the blast furnace operation system needs to be adjusted simultaneously to achieve a high proportion of lump coal to replace coke in blast furnace 10. The purchase cost of lump coal is only 50%-60% of that of coke, which significantly reduces the fuel cost per ton of iron. At the same time, it reduces carbon emissions and pollutant emissions in the coking process. The system has a high degree of integration and strong adaptability, and can be applied with only a partial modification to the lower part of blast furnace 10.

[0084] Specifically, regarding the air supply system, the hot air temperature should be appropriately increased by 30℃-100℃ to compensate for the heat absorption during the semi-coking of lump coal and ensure the stability of the theoretical combustion temperature before the tuyeres; the tuyeres area should be appropriately reduced to increase the blast energy and strengthen the central air supply to ensure a strong central coal flow, offsetting the increased edge permeability caused by the side lump coal feeding and preventing excessive development of the edge coal flow; the furnace top pressure should be appropriately increased by 0.02MPa-0.03MPa to prolong the gas residence time, improve the indirect reduction degree, and stabilize the pressure field inside the furnace.

[0085] Regarding the charging system, the furnace top material distribution matrix is ​​optimized, the edge load is appropriately increased, the positive charging ratio is increased, and the edge coke ring is thickened to offset the increased edge permeability caused by side lump coal, and to control the distribution ratio of gas flow between the edge and the center; the coke ratio of the central material column is maintained to ensure the stability of the central gas flow channel, and the softening zone is maintained in a stable inverted V shape, with its top matching the 250 position of the feed inlet to avoid the softening zone moving up or down.

[0086] Regarding the slag-making process, the ratio of sinter to flux is adjusted according to the ash content of lump coal to ensure the stability of the binary basicity of the slag, as well as the slag fluidity and desulfurization capacity, thus avoiding the deterioration of slag performance caused by the ash content of lump coal.

[0087] In an embodiment of the present invention, the lower furnace body of the blast furnace 10 is provided with a plurality of opening positions for installing the feed inlet 250. The in-situ semi-coking module 200 of the lump coal semi-coking treatment system based on blast furnace ironmaking is provided with a plurality of such modules, and the feed inlet 250 of each in-situ semi-coking module 200 is correspondingly provided on an opening position.

[0088] Specifically, at least four opening stations should be symmetrically arranged along the circumference; odd numbers and asymmetrical openings are strictly prohibited. Furthermore, the opening station at the 250mm feed inlet should adhere to the following positioning principle: located in the lower part of the blast furnace body, between the bottom of the blocky zone and the top of the softening zone, i.e., where the gas temperature inside the furnace is stable at 900℃-1000℃, avoiding molten material scouring and the highest temperature zone. The blast furnace body uses circular openings, completely avoiding the longitudinal welds, circumferential welds, and cooling wall joints of the furnace shell to prevent stress concentration cracking.

[0089] By setting multiple opening stations at intervals on the lower part of the blast furnace 10 and correspondingly setting multiple in-situ semi-coking modules 200, each module is independently controlled and works in coordination. The height, angle and structure of all feed ports 250 are completely consistent. The inner side of the feed port 250 is tilted downward by 15°-30° to ensure that the material flow trajectory of each feed port 250 is exactly the same. This achieves symmetrical and uniform feeding into the furnace at multiple points along the circumference of the blast furnace 10, ensuring that the lump coal is evenly distributed in the lower part of the furnace body and avoiding local abnormal air permeability caused by single-point or asymmetrical feeding.

[0090] Furthermore, an integrally milled irregular copper cooling wall and a corundum-silicon carbide wear-resistant furnace lining are installed at the 250mm feed inlet. A replaceable high-chromium cast iron wear-resistant bushing is nested inside. A closed-loop annular cooling water circuit is set around the opening and connected in parallel with the original cooling system of blast furnace 10, with independent water supply, to ensure the structural safety and long-term operational reliability of blast furnace 10.

[0091] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0092] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A lump coal semi-coking treatment system based on blast furnace ironmaking, characterized in that, include: A preheating dry distillation furnace, wherein the preheating dry distillation furnace is used for pre-semi-coking treatment of lump coal; The in-situ semi-coking module includes a high-level silo, two dynamically sealed silos connected in parallel to the high-level silo, a control silo connecting the two dynamically sealed silos, a discharge pipe connecting the control silo, and a feed inlet connected to the discharge pipe and used for installation on the blast furnace. The high-level silo is used to receive lump coal processed by the preheating dry distillation furnace. The two dynamically sealed silos can alternately perform venting, loading, pressure equalization, and unloading operations to continuously transport lump coal. The lump coal flowing down through the dynamically sealed silos comes into countercurrent contact with the blast furnace gas flowing up through the feed inlet to semi-coke the lump coal.

2. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, The lump coal semi-coking treatment system based on blast furnace ironmaking also includes a flue gas conveying pipeline, which is used to connect the sintering ring cooler and the preheating dry distillation furnace. The flue gas conveying pipeline can convey the flue gas from the sintering ring cooler to the preheating dry distillation furnace for pre-semi-coking treatment of lump coal.

3. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 2, characterized in that, The semi-coking coal processing system based on blast furnace ironmaking also includes a flue gas treatment module installed on the flue gas conveying pipeline. The flue gas treatment module includes at least one of a dust removal and purification device, a temperature regulation device, and a flow control device.

4. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 2, characterized in that, The preheating carbonization furnace includes a sealable material channel and a conveyor belt disposed in the material channel. The material channel is sequentially divided into a feeding section, a preheating and drying section, a medium-low temperature carbonization section, and a discharging section. The lump coal semi-coking treatment system based on blast furnace ironmaking also includes at least one sealing partition for separating and wrapping the lump coal. The conveyor belt can drive the lump coal in the sealing partition to be transported along the feeding section, the preheating and drying section, the medium-low temperature carbonization section, and the discharging section.

5. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 4, characterized in that, The semi-coking system for lump coal based on blast furnace ironmaking also includes a flue gas circulation pipeline, an igniter installed on the flue gas circulation pipeline, and a temperature sensor installed in the medium-low temperature dry distillation section. The inlet of the flue gas circulation pipeline is connected to the feeding section, and the outlet of the flue gas circulation pipeline is connected to the medium-low temperature dry distillation section. The igniter can burn and heat the circulating flue gas in the flue gas circulation pipeline based on the temperature data of the temperature sensor.

6. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 5, characterized in that, The flue gas circulation pipeline is also equipped with a buffer tank, and the preheating dry distillation furnace is equipped with at least one flue gas flow regulating valve. The flue gas flow regulating valve is connected to the flue gas conveying pipeline and the medium-low temperature dry distillation section. The igniter is located downstream of the buffer tank. The flue gas flow regulating valve can adjust the flue gas flow based on the temperature data of the temperature sensor. The igniter can ignite the gas drawn from the buffer tank based on the temperature data of the temperature sensor to keep the gas within a preset temperature range.

7. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, The lump coal semi-coking treatment system based on blast furnace ironmaking also includes a screening device, which is used to screen out powder from the lump coal after it has been treated by the preheating dry distillation furnace.

8. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 7, characterized in that, The lump coal semi-coking treatment system based on blast furnace ironmaking also includes a material distribution device installed on the high-level silo.

9. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 8, characterized in that, The semi-coking coal processing system based on blast furnace ironmaking also includes a storage bin and a bucket elevator. The storage bin is used to store the lump coal processed by the screening device, and the bucket elevator is used to transport the lump coal in the storage bin to the feeding device.

10. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, The high-level silo includes an upper silo body and two lower silos connected to the upper silo body. A weighing feeder is provided at the bottom of each lower silo body, and each lower silo body is connected to one of the dynamic sealed silos.

11. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 10, characterized in that, The semi-coking module also includes a first material flow regulating valve disposed between the lower silo and the dynamic sealing silo, and a second material flow regulating valve disposed between the dynamic sealing silo and the control silo.

12. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, The semi-coking module also includes a pressure equalization valve and a venting valve connected to the dynamic sealed silo, wherein the pressure equalization valve is used to connect to a pressurized gas source.

13. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, The feeding pipe includes an inner pipe for conveying lump coal and a circulating cooling water sleeve sleeved on the outside of the inner pipe.

14. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, The semi-coking system for lump coal based on blast furnace ironmaking also includes a vibrator connected to the feed pipe.

15. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 1, characterized in that, Along the conveying direction of the feed inlet, the opening area of ​​the feed inlet gradually increases to form a fan shape.

16. The lump coal semi-coking treatment system based on blast furnace ironmaking as described in claim 15, characterized in that, The bottom of the feed inlet is provided with a guide plate, which is inclined downward at 15° to 20°.

17. A semi-coking process for lump coal, characterized in that, The lump coal semi-coking process is implemented using the lump coal semi-coking system based on blast furnace ironmaking as described in any one of claims 1 to 16, wherein the lump coal semi-coking process includes the following steps: Pre-semi-coking lump coal is obtained by preheating, drying and pyrolysis of the lump coal to be treated in a preheating pyrolysis furnace. The pre-semi-coking lump coal is screened and then transported to a high-level silo. Control the two dynamic sealed silos to alternately perform venting, loading, pressure equalization and unloading operations; After being unloaded, the pre-semi-coking lump coal enters the control bin and then enters the blast furnace through the feed pipe and feed inlet. During the unloading operation and entry into the blast furnace, the downward-flowing pre-semi-coking lump coal and the upward-flowing blast furnace gas through the feed inlet form a countercurrent contact, thereby completing the semi-coking process.

18. A smelting process system, characterized in that, It includes a blast furnace and at least one lump coal semi-coking system based on blast furnace ironmaking as described in any one of claims 1 to 16.

19. The smelting process system as described in claim 18, characterized in that, The lower furnace body of the blast furnace is provided with a plurality of opening stations for installing the feed inlet in a spacer ring. The in-situ semi-coking module of the lump coal semi-coking treatment system based on blast furnace ironmaking is provided with a plurality of such modules, and the feed inlet of each of the in-situ semi-coking modules is correspondingly set on one of the opening stations.

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