A multi-functional device for heat preservation and atmosphere adjustment of a top-blown furnace and a control method thereof

Abstract

The application discloses a kind of top-blown converter heat preservation and atmosphere adjusting multifunctional device and its control method, it includes: multifunctional device ontology, the inside of multifunctional device ontology is equipped with over liquid cavity and over gas cavity, over liquid cavity and over gas cavity one end are all communicated to the head of multifunctional device ontology, and the other end of over liquid cavity and over gas cavity is respectively communicated to the tail of multifunctional device ontology;Liquid fuel supply pipe is connected to the tail of multifunctional device ontology and communicated with the other end of over liquid cavity, and liquid fuel supply pipe is connected with fuel solenoid valve and can control the supply of fuel and stove state;Gas supply pipe group is connected to the tail of multifunctional device ontology and communicated with the other end of over gas cavity, and gas supply pipe group is connected with the oxygen source and / or compressed gas source outside, for oxygen-enriched air make-up in smelting process in stove, the application can stove and oxygen-enriched air make-up to top-blown converter, when using, can reduce make-up amount, to reduce the heat loss in stove due to make-up, reach the purpose of energy saving.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metallurgical technology, specifically to a multi-functional backup device for a top-blown furnace and its control method. Background Technology

[0002] Top-blown submerged lance smelting technology is one of the outstanding representative processes of molten pool smelting. Since the introduction of top-blown furnaces in crude tin smelting, it has been widely used due to its strong adaptability to complex materials, large capacity, and excellent economic indicators.

[0003] However, during the initial tin smelting process in a top-blown furnace, sulfur in the tin-containing materials combines with tin metal to form highly volatile SnS, increasing the tin content in the flue gas and reducing the direct tin recovery rate. Simultaneously, the crude tin reduction smelting stage also generates a large amount of CO, reaching up to 70,000 ppm, posing significant safety and environmental hazards, and also wasting energy. To address these issues, existing technology involves introducing a large amount of compressed air (pressurized air with 21% oxygen) through an insulation device. This allows the sulfur in the material to fully combust into SO2, which then enters the acid production workshop with the flue gas. The CO is then combusted to generate CO2, which enters the tail gas system, with a maximum injection level of 6000 m³ / h. 3 However, the injection of a large amount of compressed air will increase the flue gas volume and decrease the flue gas temperature, ultimately leading to an increase in the dust rate of the top-blown furnace, a decrease in the steam volume of the waste heat boiler, and an increase in slag formation in the flue. Secondly, the injection of a large amount of compressed air will also take away the heat in the furnace, leading to an increase in the coal consumption of the top-blown furnace. Moreover, the insulation equipment and the air injection device of most top-blown furnaces are separate, requiring two holes to be opened on the top of the top-blown furnace as air injection and insulation channels.

[0004] Chinese patent CN101403044A provides a method for oxygen-enriched smelting of tin concentrate in a top-blown submerged furnace. The oxygen enrichment is achieved by enriching the oxygen in the molten pool of the top-blown furnace lance, which can improve the combustion efficiency of the lance and thus improve the processing efficiency and throughput of tin concentrate. However, it still requires a large amount of make-up air, which increases heat loss.

[0005] Therefore, how to provide a multifunctional device for heat preservation and atmosphere conditioning of a top-blown furnace and its control method is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace and its control method. Under abnormal operating conditions (furnace shutdown or start-up), the multi-functional device can spray fire to heat the furnace. Under normal production conditions, it can enrich oxygen and make up air, regulate the atmosphere at the top of the furnace, reduce the amount of make-up air, reduce the generation of harmful gases, and reduce heat loss.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace, comprising:

[0008] The multifunctional device body has a liquid passage chamber and an air passage chamber inside. One end of the liquid passage chamber and the air passage chamber are connected to the head of the multifunctional device body, and the other end of the liquid passage chamber and the air passage chamber are connected to the tail of the multifunctional device body. A liquid fuel supply pipe is connected to the tail end of the multifunctional device body and communicates with the other end of the liquid passage chamber. The liquid fuel supply pipe is connected to a fuel solenoid valve and can control the fuel supply and the furnace baking status. A gas supply pipe assembly is connected to the tail end of the multifunctional device body and communicates with the other end of the gas passage chamber. The gas supply pipe assembly is connected to an external oxygen source and / or compressed gas source for oxygen enrichment and air replenishment during the furnace smelting process.

[0009] The technical effects of this invention are as follows: the multifunctional device body can not only spray fire to heat the furnace, but also enrich the furnace with oxygen to increase the functionality of the device. At the same time, due to the oxygen-enriched air supply, the amount of secondary combustion air supplied after oxygen enrichment can be reduced while ensuring the full combustion of combustibles in the flue gas, thereby reducing heat loss in the furnace and achieving the purpose of saving energy.

[0010] Specifically, supplementing with oxygen-enriched air allows for the complete combustion of combustibles such as CO, S, C, and H2S while reducing the amount of compressed air required. This not only increases flue gas temperature and improves the thermal efficiency of the waste heat boiler, but also prevents excessive CO concentration from polluting the environment or causing explosions in subsequent systems. It also ensures that harmful element S from tin smelting is fully combusted into SO2 and enters the acid production system, preventing S from circulating within the tin smelting system and creating an "open circuit" for S. Furthermore, it avoids the large amount of heat carried away by compressed air, which would otherwise increase coal consumption in the top-blown furnace. Secondly, during top-blown furnace lance changes or in abnormal operating conditions, the multi-functional device can provide a heat source to the furnace at any time, protecting refractory materials and shortening furnace restart time. This dual-function system simplifies the production process.

[0011] Preferably, the gas supply pipe assembly includes an oxygen supply pipe, a compressed gas supply pipe, and a common pipe. One end of the oxygen supply pipe is connected to an external oxygen source, and the other end of the oxygen supply pipe is connected to one end of the common pipe. One end of the compressed gas supply pipe is connected to an external compressed gas source, and the other end is connected to one end of the common pipe. The other end of the common pipe is connected to the tail of the multifunctional device body and communicates with the other end of the gas passage chamber.

[0012] The resulting technical effect is that oxygen and compressed gas can be mixed and supplied to the furnace through the gas supply pipe assembly, realizing the secondary combustion air supply after oxygen enrichment, resulting in better combustion effect, and also reducing the overall supply air volume and heat loss.

[0013] Preferably, the system also includes an oxygen solenoid valve and a compressed gas solenoid valve. The oxygen solenoid valve is connected to the oxygen supply pipe and is used to control the flow of oxygen. The compressed gas solenoid valve is connected to the compressed gas supply pipe and is used to control the flow of compressed gas. The oxygen solenoid valve and the compressed gas solenoid valve can be electrically connected to the top-blown furnace DCS control system.

[0014] The resulting technical effect is that oxygen and compressed gas can be mixed and supplied to the furnace through the gas supply pipe assembly, and the mixing state of the mixed gas can be adjusted by the corresponding solenoid valve, that is, the oxygen concentration can be changed and supplied as needed.

[0015] Preferably, the flow state includes the medium on / off state and the medium flow rate state.

[0016] The resulting technical effect is that the on / off state and flow rate of the medium are controlled by the corresponding solenoid valve. The medium refers to liquid fuel, oxygen, and compressed gas.

[0017] Preferably, it also includes a flame arrester connected to the oxygen supply pipe and located downstream of the oxygen solenoid valve.

[0018] The resulting technical effect is that the flame arrester provides safety and prevents oxygen backfire.

[0019] Preferably, the multifunctional device body is connected to the lifting end of an external lifting mechanism. The lifting mechanism is used to control the entry and exit of the multifunctional device body into the secondary air inlet of the furnace body. The arrangement direction of the multifunctional device body is parallel to the opening direction of the secondary air inlet.

[0020] The resulting technical effect is that the multi-functional device body has different positions relative to the furnace body under different usage conditions. The multi-functional device body is controlled by a lifting mechanism. When baking the furnace, it needs to be extended into the furnace to spray fire. When supplementing air (secondary combustion air), the multi-functional device body needs to be moved outward to the air outlet.

[0021] This invention also discloses a control method for a multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace. The device uses the aforementioned multi-functional device for heat preservation and atmosphere regulation. During furnace ignition and baking, oxygen supply is stopped, and the DCS control system of the top-blown furnace regulates the mixing state of liquid fuel and compressed gas by controlling the fuel solenoid valve and the compressed gas solenoid valve. During the reduction smelting air replenishment, liquid fuel supply is stopped, and the DCS control system of the top-blown furnace regulates the oxygen supply concentration by controlling the oxygen solenoid valve and the compressed gas solenoid valve.

[0022] The resulting technical effect is that during ignition and furnace baking, the liquid fuel and compressed air volume are controlled by the front-end solenoid valve and connected to the top-blown furnace DCS control system. During air replenishment, the compressed air and oxygen volume are calculated by the oxygen concentration calculation formula and connected to the top-blown furnace DCS control system. Thus, the oxygen concentration and volume of the secondary combustion air can be controlled by the top-blown furnace DCS control system.

[0023] Preferably, the liquid fuel supply, compressed air volume, and oxygen volume are all controlled by the corresponding pipeline solenoid valves. During the furnace baking process, the liquid fuel supply is set to 100-600 kg / h according to the temperature requirements. During the reduction smelting process, the compressed air volume and oxygen volume are adjusted in a timely and appropriate manner according to the CO and SO2 in the exhaust gas, and the secondary combustion air oxygen concentration is controlled at 25%-40%.

[0024] The resulting technical effect is that the top-blown furnace DCS control system can automatically distribute air.

[0025] Preferably, under abnormal operating conditions, when the lifting mechanism controls the body of the multi-functional device to enter the furnace for ignition and furnace baking, and when the air is replenished during the reduction smelting process, the head of the body of the multi-functional device enters the furnace by 10cm~15cm. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the application of a multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace according to the present invention. Figure 2 This is a schematic diagram of the combination of the liquid passage chamber and the gas passage chamber in a multifunctional device for heat preservation and atmosphere regulation of a top-blown furnace according to the present invention.

[0027] 1. Multifunctional device body, 2. Liquid fuel supply pipe, 3. Fuel solenoid valve, 4. Gas supply pipe assembly, 41. Oxygen supply pipe, 42. Compressed gas supply pipe, 43. Common pipe, 5. Oxygen solenoid valve, 6. Compressed gas solenoid valve, 7. Flame arrester, 8. Furnace body, 81. Feed inlet, 9. Top-blown furnace spray gun, 10. Lifting mechanism. Detailed Implementation

[0028] 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.

[0029] See the appendix of this invention. Figure 1-2 According to an embodiment of the present invention, a multifunctional device for heat preservation and atmosphere conditioning of a top-blown furnace includes: The multi-functional device body 1 has a liquid passage chamber and an air passage chamber inside. The liquid passage chamber and the air passage chamber are nested inside each other, with the liquid passage chamber located in the inner layer. One end of the liquid passage chamber and the air passage chamber are connected to the head of the multi-functional device body 1, which is a flame-throwing end or a jet-throwing end. The other end of the liquid passage chamber and the air passage chamber are connected to the tail of the multi-functional device body 1. Liquid fuel supply pipe 2 is connected to the tail of the multi-functional device body 1 and communicates with the other end of the liquid passage chamber. In specific implementation, the liquid fuel is diesel. The liquid fuel supply pipe 2 is connected to a fuel solenoid valve 3 and can control the fuel supply and the furnace baking status. Gas supply pipe assembly 4 is connected to the tail of the multi-functional device body 1 and communicates with the other end of the gas passage chamber. Gas supply pipe assembly 4 is connected to an external oxygen source and / or compressed gas source for oxygen enrichment and air replenishment during the furnace smelting process.

[0030] This device can heat the furnace with flames and also enrich the air with oxygen, reducing the total amount of air needed for replenishment and thus reducing heat loss.

[0031] In other embodiments, the gas supply pipe assembly 4 includes an oxygen supply pipe 41, a compressed gas supply pipe 42, and a common pipe 43. One end of the oxygen supply pipe 41 is connected to an external oxygen source, and the other end of the oxygen supply pipe 41 is connected to one end of the common pipe 43. One end of the compressed gas supply pipe 42 is connected to an external compressed gas source, and the other end is connected to one end of the common pipe 43. The other end of the common pipe 43 is connected to the tail of the multi-functional device body 1 and communicates with the other end of the gas passage chamber. The gas supply pipe assembly can provide simple air supply or oxygen-enriched air supply. Oxygen-enriched air supply can reduce the air volume required for secondary combustion and reduce the heat loss caused by air supply.

[0032] In some other specific embodiments, an oxygen solenoid valve 5 and a compressed gas solenoid valve 6 are also included. The oxygen solenoid valve 5 is connected to the oxygen supply pipe 41 and is used to control the flow state of oxygen. The compressed gas solenoid valve 6 is connected to the compressed gas supply pipe 42 and is used to control the flow state of compressed gas. The oxygen solenoid valve 5 and the compressed gas solenoid valve 6 can be electrically connected to the top-blown furnace DCS control system. The flow state includes the medium on / off state and the medium flow state, which is realized through feedback control of the top-blown furnace DCS control system via the solenoid valves.

[0033] In some other embodiments, a flame arrester 7 is also included, which is connected to the oxygen supply line 41 and is located downstream of the oxygen solenoid valve 5.

[0034] In other embodiments, the flame arrester can prevent backfire in oxygen lines, improving safety during use.

[0035] In some other embodiments, the multifunctional device body 1 is connected to the lifting end of the external lifting mechanism 10. The lifting mechanism 10 is used to control the entry and exit of the multifunctional device body 1 into the secondary air inlet of the furnace body 8. The arrangement direction of the multifunctional device body 1 is parallel to the opening direction of the secondary air inlet.

[0036] This invention also discloses a control method for a multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace. The device uses the aforementioned multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace. During ignition and furnace baking, oxygen supply is stopped, and the top-blown furnace DCS control system regulates the mixing state of liquid fuel and compressed gas by controlling the fuel solenoid valve 3 and the compressed gas solenoid valve 6. During the reduction smelting air replenishment, liquid fuel supply is stopped, and the top-blown furnace DCS control system regulates the oxygen supply concentration by controlling the oxygen solenoid valve 5 and the compressed gas solenoid valve 6.

[0037] Oxygen is not used during furnace ignition and baking. Compressed air and diesel fuel are controlled by calculating and setting combustion factors and connecting them to the top-blown furnace DCS control system. During the reduction smelting air replenishment, the amount of compressed air and oxygen is calculated by the oxygen concentration calculation formula and connected to the top-blown furnace DCS control system.

[0038] In other embodiments, the liquid fuel supply, compressed air volume, and oxygen volume are all controlled by corresponding pipeline solenoid valves. During the furnace baking process, the liquid fuel supply is set to 100-600 kg / h according to the temperature requirements. During the reduction smelting process, the compressed air volume and oxygen volume are adjusted in a timely and appropriate manner according to the CO and SO2 in the exhaust gas, and the secondary combustion air oxygen concentration is controlled at 25%-40%.

[0039] Specifically, under abnormal operating conditions, the lifting mechanism 10 controls the multi-functional device body 1 to enter the furnace for ignition and furnace baking. During the air replenishment process in the reduction smelting process, the head of the multi-functional device body 1 enters the furnace 10cm~15cm. In other words, during air replenishment, the multi-functional device body is close to the secondary air replenishment port.

[0040] The specific operating steps are as follows: The smelting of crude tin in a top-blown furnace is mainly divided into two stages (smelting stage and reduction stage). The completion of the two stages marks the end of one furnace cycle. After the furnace cycle ends, the top-blown furnace spray gun 9 needs to be removed and replaced.

[0041] (1) CO and SO2 detection devices (gas concentration detectors) are installed in the flue. When the top blown furnace in the smelting section is started, the top blown furnace spray gun 9 is lowered to the gun head and immersed in the molten pool for 10-20cm. The tin-containing materials, solvents and reducing coal are started to start normal smelting. The tin materials, solvents and reducing coal are transported by belt from the feed port 81 into the furnace body 8.

[0042] (2) Materials, solvents and reducing coal enter the top blow furnace for smelting and slag making. At this time, the concentrations of CO, C and SO2 in the flue gas are relatively low.

[0043] (3) As the smelting stage progresses, when SO2 levels fall below 1000 ppm, it indicates insufficient sulfur combustion. Compressed air should be started and set to 1500 Nm. 3 / h (standard cubic meters per hour) and set the oxygen concentration to 32%, the DCS system (the system that controls the valves for air, oxygen, and oil) automatically adjusts the oxygen solenoid valve 5 to supply 311Nm. 3 / h oxygen, at this time the SO2 concentration in the flue gas gradually increases, indicating that the sulfur combustion in the furnace produces SO2. Continue to add air and oxygen until the SO2 no longer increases, indicating that the supplementary air and oxygen supply is appropriate.

[0044] (4) When the tin-containing material accumulates to approximately 90t, stop feeding the material and increase the input of reducing coal to enter the reduction stage. As the feeding stops and the reducing coal is added, the SO2 in the flue gas gradually decreases and the CO concentration gradually increases. At this point, the CO concentration can reach a maximum of 70,000ppm. Set the compressed air to 3000 Nm³. 3 / h and set the oxygen concentration to 36%, the DCS system automatically adjusts the oxygen solenoid valve 5 to supply 918Nm 3 / h oxygen, continuously increase air and oxygen until the CO concentration in the flue gas is below 1000ppm, then gradually reduce air and oxygen, and adjust the oxygen concentration to maintain the CO concentration below 1000ppm.

[0045] (5) After the completion of the two-stage operation, the top-blown furnace spray gun 9 is lifted out of the furnace body 8 for gun replacement. At this time, a multi-functional device is required for heat preservation. The multi-functional device is lowered into the furnace through the lifting mechanism 10. The oil flow rate is set to 350 kg / h. At this time, the DCS system automatically supplies combustion air at 5400 m³ / h. 3 / h, at which point the furnace temperature is high, and the multi-functional device is ignited to spray fire for heat preservation.

[0046] Example 1 In the top-blown furnace operation, after the air, coal, and oxygen are ready, the lance is lowered to the smelting position and the material system is started. Tin-containing materials, solvent, and reducing coal are added to the furnace, and normal smelting and slagging begins. At this time, the material flow rate is set at 65 t / h, reducing coal at 2.5 t / h, and solvent at 1 t / h. After 5 minutes of smelting and slagging, the CO concentration in the flue gas rises to 26,000 ppm, the SO2 concentration rises to 1,500 ppm, the rising flue gas temperature is 780℃, and the waste heat boiler steam flow rate is 26 t / h. At this point, the secondary combustion air is started, and the compressed air flow rate is set to 2400 Nm³. 3 / h, set oxygen concentration to 31%, DCS coefficient automatically adjusted to 678Nm 3As smelting continues, the CO concentration in the flue gas gradually decreases and stabilizes at around 800 ppm, while the SO2 concentration gradually increases and stabilizes at around 4600 ppm. The temperature in the rising flue gas continues to rise and stabilize at around 884°C, and the steam output from the waste heat boiler increases to 32 t / h. At this stage, only minor adjustments to the oxygen concentration are needed based on fluctuations in CO and SO2. When the material accumulation reaches 85 t, the addition of tin-containing materials is stopped, and the instantaneous feed rate of reducing coal is increased to 6 t / h. As reduction proceeds, the CO concentration gradually increases to 57000 mmHg, while the SO2 gradually decreases to 556 ppm. At this point, the oxygen concentration is further increased to 38%, and the compressed air concentration is increased to 3300 mM. 3 At 1000 ppm, the CO concentration gradually decreased to around 1000 ℃, and the temperature in the rising flue reached a stable level of around 1000 ℃. The steam output from the waste heat boiler increased to 38 t / h. The oxygen concentration settings throughout the reduction smelting process were based on the CO and SO2 concentrations to ensure CO combustion and that more sulfur in the furnace was converted to SO2. After the operation was completed, metallic tin and slag were discharged from the furnace, completing one furnace cycle. At this point, the top-blown furnace lance was removed for lance replacement. The lance was removed from the furnace body, and the multi-functional device was lowered into the furnace. The fuel oil flow rate was set to 450 kg / h, and the system automatically sprayed air at 7500 m³ / h. 3 When the oil-air ratio reaches a certain level, the multi-functional device automatically ignites inside the furnace to start the furnace baking process. After the gun replacement is completed, the spray gun is lowered into the furnace, the multi-functional device cuts off the oil and air supply, and leaves the furnace to switch to the supplementary air mode to start the next batch of production.

[0047] Compared with existing technologies, the implementation of this invention has significantly improved various economic indicators of the top-blown furnace. The economic indicators for the month before and the month after implementation are summarized in the table below:

[0048] Implement column 2 With the air, coal, and oxygen supplies ready for the top-blown furnace lance operation, the lance is lowered to the smelting position, and secondary combustion air is started, with the compressed air volume set to 1000 Nm³. 3 / h, set oxygen concentration to 31%, DCS coefficient automatically adjusted to 223Nm 3 After restarting the oxygen material system, tin-containing materials, solvent, and reducing coal are added to the furnace, and normal smelting and slag formation begins. At this point, the material flow rate is set at 70 t / h, reducing coal at 3 t / h, and solvent at 1.5 t / h. After 5 minutes of smelting and slag formation, the CO concentration in the flue gas rises to 20,000 ppm, the SO2 concentration rises to 1,800 ppm, the rising flue gas temperature is 800℃, and the waste heat boiler steam flow rate is 28 t / h. At this point, the air volume is gradually increased to 3300 Nm³. 3At a set oxygen concentration of 35%, after 10 minutes, the CO in the flue gas gradually decreased and stabilized at around 560 ppm, while the SO2 gradually increased and stabilized at around 5800 ppm. The temperature in the rising flue gas continued to rise and stabilize at around 1030℃, and the steam output of the waste heat boiler increased to 36.6 t / h. When the accumulated material reached 90 t, the addition of tin-containing materials was stopped, and the instantaneous feed rate of reducing coal was increased to 7 t / h. As reduction proceeded, the CO concentration gradually increased to 62000 ppm, while the SO2 gradually decreased to 556 ppm. At this point, the oxygen concentration was further increased to 38%, and the compressed air was increased to 3850 Nm³. 3 At 10:00 ppm, the CO concentration gradually decreased to around 900 ppm, and the temperature in the rising flue reached a stable level of around 1030 ℃. The steam output from the waste heat boiler increased to 40 t / h. The oxygen concentration settings throughout the reduction smelting process were based on the CO and SO2 concentrations to ensure CO combustion and that more sulfur in the furnace was converted to SO2. After the operation was completed, metallic tin and slag were discharged from the furnace, completing one furnace cycle. At this point, the spray gun was removed for a gun change. After the spray gun was removed from the furnace, the multi-functional device was lowered into the furnace and the fuel oil system (350 kg / h) was set to automatically spray air at 6300 m³ / h. 3 When the oil-air ratio reaches a certain level, the multi-functional device automatically ignites and starts the furnace baking process. After the gun replacement is completed, the spray gun is lowered into the furnace, the multi-functional device cuts off the oil and air supply and leaves the furnace, switching to the supplementary air mode to start the production of the next batch.

[0049] Example 3 During normal production of the top-blown furnace, the instantaneous feed rate is set to 60 t / h for raw materials, 2 t / h for reducing coal, and 1 t / h for solvent. The secondary combustion air compressed air volume is set to 2400 Nm³. 3 / h, set oxygen concentration to 31%, DCS coefficient automatically adjusted to 678Nm 3 The oxygen concentration in the flue gas gradually decreases and stabilizes at around 800 ppm, SO2 stabilizes at around 4600 ppm, and the rising flue gas temperature is around 884℃. The waste heat boiler steam output is 32 t / h. At this time, the top-blown furnace dust collection equipment malfunctions and requires a 1.5-hour shutdown. During the shutdown, there must be no flue gas in the flue. The spray gun must be removed from the furnace. After the spray gun is removed, the multi-functional device is lowered into the furnace, and the 550 kg / h fuel oil system is set to automatically spray air at 8300 m³ / h. 3 / h, when the oil-air ratio reaches a certain condition, the multi-functional device automatically ignites to keep the furnace warm. After 1.5 hours, the equipment is finished, the spray gun is removed and production continues. The multi-functional device is then removed from the furnace and switched to the supplementary air mode.

[0050] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace, characterized in that, include: The multifunctional device body (1) has a liquid passage chamber and an air passage chamber inside. One end of the liquid passage chamber and the air passage chamber are connected to the head of the multifunctional device body (1), and the other end of the liquid passage chamber and the air passage chamber are connected to the tail of the multifunctional device body (1). Liquid fuel supply pipe (2) is connected to the tail of the multi-functional device body (1) and communicates with the other end of the liquid passage chamber. The liquid fuel supply pipe (2) is connected to a fuel solenoid valve (3) and can control the fuel supply and furnace baking status. Gas supply pipe assembly (4) is connected to the tail of the multifunctional device body (1) and communicates with the other end of the gas passage chamber. The gas supply pipe assembly (4) is connected to an external oxygen source and / or compressed gas source for oxygen enrichment and air replenishment during the furnace smelting process.

2. The multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace according to claim 1, characterized in that, The gas supply pipe assembly (4) includes an oxygen supply pipe (41), a compressed gas supply pipe (42), and a common pipe (43). One end of the oxygen supply pipe (41) is connected to an external oxygen source, and the other end of the oxygen supply pipe (41) is connected to one end of the common pipe (43). One end of the compressed gas supply pipe (42) is connected to an external compressed gas source, and the other end is connected to one end of the common pipe (43). The other end of the common pipe (43) is connected to the tail of the multi-functional device body (1) and communicates with the other end of the gas passage chamber.

3. The multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace according to claim 2, characterized in that, It also includes an oxygen solenoid valve (5) and a compressed gas solenoid valve (6). The oxygen solenoid valve (5) is connected to the oxygen supply pipe (41) and is used to control the flow of oxygen. The compressed gas solenoid valve (6) is connected to the compressed gas supply pipe (42) and is used to control the flow of compressed gas. The oxygen solenoid valve (5) and the compressed gas solenoid valve (6) can be electrically connected to the top blown furnace DCS control system.

4. The multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace according to claim 3, characterized in that, The aforementioned flow state includes the medium on / off state and the medium flow rate state.

5. The multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace according to claim 3, characterized in that, It also includes a flame arrester (7), which is connected to the oxygen supply pipe (41) and is located downstream of the oxygen solenoid valve (5).

6. The multi-functional device for heat preservation and atmosphere regulation of a top-blown furnace according to claim 1, characterized in that, The multifunctional device body (1) is connected to the lifting end of the external lifting mechanism (10). The lifting mechanism (10) is used to control the entry and exit of the multifunctional device body (1) into the secondary air inlet of the furnace body (8). The arrangement direction of the multifunctional device body (1) is parallel to the opening direction of the secondary air inlet.

7. A control method for a multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace, comprising using the multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace as described in any one of claims 1-6, characterized in that, When the furnace is ignited and baked, the oxygen supply is stopped. The DCS control system of the top-blown furnace adjusts the mixing state of liquid fuel and compressed gas by controlling the fuel solenoid valve (3) and the compressed gas solenoid valve (6). When the furnace is blasted for reduction smelting, the liquid fuel supply is stopped. The DCS control system of the top-blown furnace adjusts the oxygen supply concentration by controlling the oxygen solenoid valve (5) and the compressed gas solenoid valve (6).

8. The control method for a multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace according to claim 7, characterized in that, The liquid fuel supply, compressed air volume, and oxygen volume are all controlled by the corresponding pipeline solenoid valves. During the furnace baking process, the liquid fuel supply is set to 100-600 kg / h according to the temperature requirements. During the reduction smelting process, the compressed air volume and oxygen volume are adjusted in a timely and appropriate manner according to the CO and SO2 in the exhaust gas. The oxygen concentration of the secondary combustion air is controlled at 25%-40%.

9. The control method for a multi-functional device for heat preservation and atmosphere conditioning of a top-blown furnace according to claim 7 or 8, characterized in that, Under abnormal operating conditions, the lifting mechanism (10) controls the multifunctional device body (1) to enter the furnace for ignition and baking. When the air is replenished during the reduction smelting process, the head of the multifunctional device body (1) enters the furnace by 10cm~15cm.

Images