A lump ore mixed combustion drying system

Abstract

The utility model relates to a lump ore mixed burning drying system, apply in lump ore drying technical field, solved the problem of higher production upgrade; including hot blast furnace, drying cylinder, air induction component and reflux component, set up the ignition burner on hot blast furnace, set up respectively on ignition burner all have electromagnetic cut -off valve's propane delivery pipeline, gas delivery pipeline, coal powder delivery pipeline and blast pipe, drying cylinder is used for drying to lump ore, and the air inlet of drying cylinder is connected with the air outlet of hot blast furnace, air induction component includes the air induction pipe of setting in drying cylinder far away from hot blast furnace one end and sets up in the air induction fan of air induction pipe, and the exhaust of air induction pipe is provided with the outer exhaust chimney, and the reflux component is used for the waste heat in drying cylinder to flow back to hot blast furnace, has reduced the coal powder consumption with the mixed burning mode of gas and coal powder, reduced fuel cost cost, can make full use of the residual gas in the factory again, the effect of saving production cost.

Description

Technical Field

[0001] This invention relates to the field of lump ore drying technology, and in particular to a lump ore co-firing and drying system. Background Technology

[0002] Due to the demand for blast furnace ore, a certain proportion of raw iron ore needs to be fed into the furnace for smelting. Because the original moisture content of the iron ore is relatively high, feeding it into the furnace increases the heat consumption during smelting, causes moisture evaporation and adhesion, and also affects the permeability of the blast furnace burden structure. This includes expansion, breakage, and pulverization caused by moisture evaporation, which can negatively impact the smooth operation of the blast furnace. Therefore, blast furnace ironmaking typically requires drying the lump iron ore to reduce the impact of moisture content on blast furnace smelting.

[0003] The drying of lump ore in furnaces generally adopts the form of hot air furnace plus dryer. The material enters the dryer through material conveying, and the heat and flue gas generated by the combustion of hot air furnace enter the dryer to achieve the purpose of drying lump ore.

[0004] In traditional drying processes using drying ovens and hot air furnaces, pulverized coal is typically used to dry the flue gas at high temperatures; diesel fuel is simply used for ignition to burn the pulverized coal. This method requires a large amount of pulverized coal and is therefore costly. In addition, other steelmaking equipment within the company has a high demand for gas, often leaving a large amount of gas residue after meeting actual work requirements, resulting in waste and further increasing costs.

[0005] Therefore, this application mainly provides a high-efficiency and energy-saving drying system that can fully utilize the remaining coal gas and reduce drying costs while improving drying effect. Utility Model Content

[0006] The purpose of this utility model is to provide a lump ore co-firing and drying system that solves the problems of resource waste and high production costs in the existing system.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] This utility model provides a lump ore co-firing and drying system, comprising:

[0009] A hot air furnace is provided with an ignition burner. The ignition burner is provided with a propane conveying pipe, a gas conveying pipe, a pulverized coal conveying pipe, and a blower pipe. Each of the propane conveying pipe, the gas conveying pipe, the pulverized coal conveying pipe, and the blower pipe is provided with an electromagnetic shut-off valve.

[0010] A drying cylinder is used to dry lump ore, and the air inlet of the drying cylinder is connected to the air outlet of the hot air furnace.

[0011] An induced draft assembly includes an induced draft pipe disposed at the end of the drying cylinder away from the hot air furnace and an induced draft fan disposed on the induced draft pipe. The exhaust port of the induced draft pipe is provided with an external exhaust chimney.

[0012] A reflux assembly is used to return the waste heat in the drying cylinder to the hot air furnace.

[0013] Furthermore, both the propane delivery pipeline and the gas delivery pipeline have nitrogen delivery pipelines at their inlet ends, and both the propane delivery pipeline and the gas delivery pipeline have gas exhaust pipes at the ends near the ignition burner. Both the nitrogen delivery pipeline and the gas exhaust pipe have on / off valves.

[0014] Furthermore, the reflux assembly includes a reflux pipe and a reflux induced draft fan disposed on the reflux pipe. The air inlet end of the reflux pipe is connected to the exhaust end of the induced draft pipe, and the air outlet of the reflux assembly is connected to the interior of the hot blast furnace.

[0015] Furthermore, the outer surface of the return pipe is covered with an insulation layer.

[0016] Furthermore, a dust collector is installed on the exhaust duct.

[0017] Furthermore, a temperature detector is installed on the exhaust duct, and the signal output terminal of the temperature detector is connected to the signal receiving terminal of the controller. Both the exhaust fan and the return exhaust fan are wired to the controller.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] This utility model provides a lump ore co-firing and drying system, including a hot blast stove, a drying cylinder, an induced draft assembly, and a reflux assembly. The hot blast stove is equipped with ignition burners, and each ignition burner is respectively equipped with a propane conveying pipe, a gas conveying pipe, a pulverized coal conveying pipe, and a blower pipe. Electromagnetic shut-off valves are installed on the propane conveying pipe, the gas conveying pipe, the pulverized coal conveying pipe, and the blower pipe. The drying cylinder is used to dry the lump ore, and the air inlet of the drying cylinder is connected to the air outlet of the hot blast stove. The induced draft assembly includes an induced draft pipe located at the end of the drying cylinder away from the hot blast stove and an induced draft fan located on the induced draft pipe. An external exhaust chimney is provided at the exhaust port of the induced draft pipe. The reflux assembly is used to return the waste heat in the drying cylinder to the hot blast stove. The drying system of this structure ignites the coal gas using a propane ignition source, and then ignites the pulverized coal by heating the coal gas. The co-firing mode of coal gas and pulverized coal reduces the consumption of pulverized coal, lowers fuel costs, and makes full use of the remaining coal gas in the plant, saving production costs. Attached Figure Description

[0020] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure in a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the connection relationship between the drying cylinder and the air-expelling assembly in a preferred embodiment of this utility model.

[0024] The reference numerals in the attached figures are explained as follows:

[0025] 1. Hot air furnace; 2. Drying cylinder; 3. Exhaust fan assembly; 31. Exhaust fan duct; 32. Exhaust fan; 4. Recirculation assembly; 41. Recirculation duct; 42. Recirculation exhaust fan; 5. Ignition burner; 6. Propane conveying pipeline; 7. Coal gas conveying pipeline; 8. Pulverized coal conveying pipeline; 9. Blower duct; 10. Electromagnetic shut-off valve; 11. External exhaust chimney; 12. Insulation layer; 13. Dust collector; 14. Temperature detector; 15. Nitrogen conveying pipeline; 16. Gas exhaust pipe; 17. On / off valve. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0027] 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.

[0028] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] refer to Figure 1 , Figure 2 and Figure 3 The present invention provides a lump ore co-firing and drying system, which includes a hot air furnace 1, a drying cylinder 2, an induced draft assembly 3 and a reflux assembly 4.

[0030] refer to Figure 1 , Figure 2 and Figure 3 The hot blast furnace 1 is equipped with an ignition burner 5, which is connected to a propane delivery pipe 6, a coal gas delivery pipe 7, a pulverized coal delivery pipe 8, and a blower pipe 9. The inlet of the coal gas delivery pipe 7 is connected to the outlet of the on-site coal gas storage tank, thereby delivering surplus coal gas to this drying system, enabling the use of surplus coal gas, reducing waste, and saving costs. The propane delivery pipe 6 is equipped with a pressure regulating valve, a quick-cut valve, a flow regulating valve, a flow detector, and an electromagnetic shut-off valve 10 along the inlet direction. The coal gas delivery pipe 7 is equipped with an electric butterfly valve, a high-pressure plate valve, an electric regulating valve, and an electromagnetic shut-off valve 10 along the inlet direction. The pulverized coal delivery pipe 8 is also equipped with an electromagnetic shut-off valve 10. The blower pipe 9 is equipped with a pressure sensor and a blower flow meter along the inlet direction, and is also equipped with an electromagnetic shut-off valve 10. Through the different functions of the valves, adjustments can be made according to actual working needs to ensure normal and safe high-temperature heating of the hot blast furnace 1.

[0031] refer to Figure 1 , Figure 2 and Figure 3 When the hot blast stove 1 of this structure is working, a certain amount of propane is supplied to the ignition burner 5 through the propane supply pipe 6. The propane is ignited by the igniter on the ignition burner 5. Coal gas is supplied through the gas supply pipe 7. The open flame generated by the ignited propane ignites the input coal gas. During this process, air is blown in through the blast pipe 9. The air provides oxygen for the ignition of propane and coal gas. At the same time, the airflow blown in through the blast pipe 9 enters the hot blast stove 1. The airflow in the hot blast stove 1 is heated by the ignited coal gas. After being heated to a certain temperature, pulverized coal is supplied to the hot blast stove 1 through the pulverized coal supply pipe 8. At this time, the pulverized coal spontaneously combusts at high temperature. Subsequently, the airflow blown into the hot blast stove 1 is heated to the set temperature through the combined action of coal gas and pulverized coal. In this process, when the furnace is heated by the combined action of coal gas and pulverized coal, the remaining coal gas can be fully utilized and the consumption of pulverized coal can be reduced, thereby significantly reducing costs.

[0032] refer to Figure 1 , Figure 2 and Figure 3 The drying cylinder 2 is used to dry the lump ore. The air inlet of the drying cylinder 2 is connected to the air outlet of the hot air furnace 1. The outside of the drying cylinder 2 is equipped with a rotating component that drives it to rotate.

[0033] refer to Figure 1 , Figure 2 and Figure 3 The induced draft assembly 3 includes an induced draft pipe 31 located at the end of the drying cylinder 2 furthest from the hot blast stove 1 and an induced draft fan 32 mounted on the induced draft pipe 31. An external exhaust chimney 11 is provided at the exhaust port of the induced draft pipe 31. The induced draft assembly 3 draws high-temperature hot air from the hot blast stove 1 into the drying cylinder 2, thereby drying the ore within the drying cylinder 2. Afterward, the dried air, still carrying some residual heat, is drawn out of the drying cylinder 2 through the induced draft pipe 31 and discharged through the external exhaust chimney 11.

[0034] refer to Figure 1 , Figure 2 and Figure 3 The system includes a recirculation assembly 4 at the discharge end of the induced draft duct 31. The recirculation assembly 4 comprises a recirculation pipe 41 and a recirculation induced draft fan 42 mounted on the recirculation pipe 41. The inlet of the recirculation pipe 41 is connected to the exhaust end of the induced draft duct 31, and the outlet of the recirculation assembly 4 is connected to the interior of the hot air furnace 1. The recirculation assembly 4 is used to return the hot air containing residual heat drawn from the drying cylinder 2 to the hot air furnace 1. This recirculation assembly 4 allows for the reuse of a portion of the hot air containing residual heat, further saving costs. The flow rates of the hot air entering the drying cylinder 2 and returning to the hot air furnace 1 can be adjusted by the induced draft fan 32 and the recirculation induced draft fan 42 to ensure the entire drying system operates in a stable and safe state.

[0035] refer to Figure 1 , Figure 2 and Figure 3 The outer surface of the return pipe 41 is covered with an insulation layer 12, which is made of aluminum silicate fiber cotton and colored rolls. The insulation layer 12 can keep the airflow in the return pipe 41 warm and prevent heat loss during the return process. A dust collector 13 is installed on the exhaust pipe 31. The dust collector 13 is a bag filter. The dust collector 13 can filter the hot air discharged from the drying cylinder 2 and store the dust in the dust collector 13. The filtered hot air is discharged from the exhaust chimney 11, which plays an environmental protection role and prevents dust from entering the hot air furnace 1.

[0036] refer to Figure 1 , Figure 2 and Figure 3A temperature detector 14 is installed on the exhaust duct 31. The signal output terminal of the temperature detector 14 is connected to the signal receiving terminal of the controller. The exhaust fan 32 and the return exhaust fan 42 are both connected to the controller by wires. The temperature detector 14 detects the temperature of the hot air in the exhaust duct 31 to determine whether the drying cylinder 2 can completely dry the lump ore. If the temperature of the discharged airflow is higher than the set value, it can be determined that the drying cylinder 2 has not completely dried the lump ore. If it is lower than the set value, the airflow speed is slow and the drying efficiency is reduced. At this time, negative feedback is sent to the controller, which controls the exhaust speed of the exhaust fan 32 and the return exhaust fan 42 to ensure that the dryer can better dry the lump ore.

[0037] refer to Figure 1 , Figure 2 and Figure 3 Both the propane delivery pipeline 6 and the gas delivery pipeline 7 have nitrogen delivery pipelines 15 at their inlet ends. Both pipelines have gas venting pipes 16 near the ignition burner 5. Both the nitrogen delivery pipeline 15 and the gas venting pipe 16 have on / off valves 17. When the delivery of propane and gas is stopped, the propane delivery pipeline 6 and the gas delivery pipeline 7 can be closed, while the nitrogen delivery pipeline 15 and the gas venting pipe 16 can be opened and nitrogen can be used to discharge any remaining propane in the propane delivery pipeline 6 and any remaining gas in the gas delivery pipeline 7, thus improving the safety performance of the entire system.

[0038] In summary, this drying system uses propane as an ignition source to ignite the coal gas, and then ignites the pulverized coal by heating the coal gas. The co-firing mode of coal gas and pulverized coal reduces the consumption of pulverized coal, lowers fuel costs, and makes full use of the remaining coal gas in the plant, thus saving production costs.

[0039] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A lump ore co-firing and drying system, characterized in that, include: A hot air furnace (1) is provided with an ignition burner (5). The ignition burner (5) is provided with a propane conveying pipe (6), a gas conveying pipe (7), a pulverized coal conveying pipe (8), and a blower pipe (9). The propane conveying pipe (6), the gas conveying pipe (7), the pulverized coal conveying pipe (8), and the blower pipe (9) are all provided with electromagnetic shut-off valves (10). Drying cylinder (2), the drying cylinder (2) is used to dry the lump ore, and the air inlet of the drying cylinder (2) is connected to the air outlet of the hot air furnace (1); The air intake assembly (3) includes an air intake pipe (31) disposed at one end of the drying cylinder (2) away from the hot air furnace (1) and an air intake fan (32) disposed on the air intake pipe (31). The exhaust port of the air intake pipe (31) is provided with an external exhaust chimney (11). The reflux assembly (4) is used to reflux the residual heat in the drying cylinder (2) back to the hot air furnace (1).

2. The lump ore co-firing and drying system according to claim 1, characterized in that, Both the propane conveying pipeline (6) and the gas conveying pipeline (7) are equipped with nitrogen conveying pipelines (15) at their inlet ends. Both the propane conveying pipeline (6) and the gas conveying pipeline (7) are equipped with gas exhaust pipes (16) at the end near the ignition burner (5). Both the nitrogen conveying pipeline (15) and the gas exhaust pipe (16) are equipped with on / off valves (17).

3. The lump ore co-firing and drying system according to claim 1 or 2, characterized in that, The reflux assembly (4) includes a reflux pipe (41) and a reflux induced draft fan (42) disposed on the reflux pipe (41). The air inlet of the reflux pipe (41) is connected to the exhaust end of the induced draft pipe (31), and the air outlet of the reflux assembly (4) is connected to the interior of the hot blast furnace (1).

4. The lump ore co-firing and drying system according to claim 3, characterized in that, The outer surface of the return pipe (41) is covered with an insulation layer (12).

5. The lump ore co-firing and drying system according to claim 1 or 4, characterized in that, A dust collector (13) is installed on the air duct (31).

6. The lump ore co-firing and drying system according to claim 3, characterized in that, A temperature detector (14) is installed on the exhaust pipe (31). The signal output terminal of the temperature detector (14) is connected to the signal receiving terminal of the controller. The exhaust fan (32) and the return exhaust fan (42) are both connected to the controller by wires.

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