Converter gas recovery device

Abstract

The present invention relates to the field of metallurgical energy recovery technology, and proposes a converter gas recovery device for recovering flue gas produced from the furnace mouth of a furnace body, comprising: a furnace hood, which is sleeved on the outside of the furnace body and has a mounting platform, and the mounting platform is located above the furnace body; a first pipeline is annular and is arranged on the mounting platform, the diameter of the first pipeline is larger than the diameter of the furnace mouth, the first pipeline is used to pass inert gas, the first pipeline has a plurality of first air holes, and the first air holes face the furnace body; a second pipeline is annular and is located below the first pipeline and above the furnace body, the diameter of the second pipeline is larger than the diameter of the first pipeline, the second pipeline is connected to the first pipeline, the second pipeline has a plurality of second air holes, the second air holes face the furnace body and the inert gas ejected from the second air holes crosses the inert gas ejected from the first air holes. Through the above technical scheme, the problem of low CO content after converter gas recovery and loss of a large amount of available energy in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical energy recovery, and in particular to a converter gas recovery device. Background Art

[0002] Converter gas is an important secondary energy source for steel enterprises, accounting for 80% to 90% of the total energy recovery in the entire steelmaking process. It can be used as an important fuel and raw material for metallurgical ladle baking, billet heating, chemical product production and steam power generation in steel enterprises.

[0003] Due to limitations in equipment level, operating system and raw material level, low converter gas recovery rate, short recovery time and low CO content in the recovered gas are common problems. In addition, the unrecoverable converter flue gas is discharged into the atmosphere after treatment, and the CO and CO2 contained in it have a great impact on the environment.

[0004] First, the high-temperature flue gas from the converter comes into contact with air at the converter mouth before entering the vaporization flue. Under high temperatures above 1500°C, 10% to 15% of the CO contained in the flue gas will burn to produce CO2, resulting in a low CO content after the converter gas is recovered, and a large amount of usable energy is lost. Summary of the invention

[0005] The present invention provides a converter gas recovery device, which solves the problem in the related art that the CO content of the converter gas after recovery is low, resulting in a large amount of available energy being lost.

[0006] The technical solution of the present invention is as follows: A converter gas recovery device, used for recovering the flue gas produced from the furnace mouth of the furnace body, comprises:

[0007] A furnace cover, which is sleeved on the outside of the furnace body and has a mounting platform, and the mounting platform is located above the furnace body;

[0008] a first pipeline, the first pipeline is annular and is arranged on the mounting platform, the diameter of the first pipeline is larger than the diameter of the furnace mouth, the first pipeline is used to introduce inert gas, the first pipeline has a plurality of first air holes, and the first air holes face the furnace body;

[0009] The second pipeline is annular and is located below the first pipeline and above the furnace body. The diameter of the second pipeline is greater than the diameter of the first pipeline. The second pipeline is connected to the first pipeline. The second pipeline has a plurality of second air holes. The second air holes face the furnace body and the inert gas ejected from the second air holes crosses the inert gas ejected from the first air holes.

[0010] Optionally, it also includes:

[0011] A first baffle and a second baffle, the first baffle and the second baffle are cylindrical and are both arranged on the mounting platform, the inner diameter of the first baffle is larger than the inner diameter of the second baffle, a guide groove is formed between the first baffle and the second baffle, the first pipeline is located in the guide groove, and the guide groove is vertically arranged toward the furnace body on the furnace mouth side.

[0012] Optionally, the length of the first baffle is greater than the length of the second baffle.

[0013] Optionally, the second pipeline is arranged on the first baffle plate, and is located on a side of the first baffle plate away from the furnace opening.

[0014] Optionally, a diameter of the second pipeline is smaller than a diameter of the first pipeline.

[0015] Optionally, it also includes:

[0016] The smoke hood is lifted and arranged on the mounting platform and is located above the furnace opening. After moving, it is close to or away from the furnace opening. The smoke hood has a blocking portion, which is conical. The diameter of the blocking portion gradually decreases from close to the furnace opening to away from the furnace opening, and is smaller than the diameter of the second baffle.

[0017] Optionally, it also includes:

[0018] A vaporization flue, the vaporization flue being arranged on the mounting platform and being in communication with the furnace opening;

[0019] A spray gun, the spray gun is arranged on the side wall of the vaporization flue and extends into the vaporization flue, and the spray gun has an inner tube;

[0020] A storage bin, used for storing dust, the storage bin being in communication with the inner tube;

[0021] A dust collection device, the dust collection device having an air suction port and an air outlet, the air suction port is communicated with the furnace cover, is located on one side below the first baffle, and is used to extract the inert gas from the first pipeline and the second pipeline, the inert gas passes through the dust collection device and enters the air outlet, and the air outlet is communicated with the storage bin,

[0022] A distributor, wherein the inert gas drives the dust removal ash into the distributor, and the distributor transports the dust removal ash to the inner tube.

[0023] Optionally, the end of the spray gun extends into the vaporization flue and further has an outer tube, which is used to introduce inert gas at normal temperature. The outer tube is eccentrically sleeved on the inner tube, and the inner tube is eccentrically arranged in the outer tube at a position away from the bottom of the vaporization flue.

[0024] Optionally, the outer tube has a first nozzle, the first nozzle is divided into a first flow portion, a second flow portion and a third flow portion which are connected in sequence, the width of the second flow portion is smaller than the width of the first flow portion, the width of the first flow portion is smaller than the width of the third flow portion, and the inner tube has a second nozzle.

[0025] Optionally, the second nozzle is fan-shaped.

[0026] The working principle and beneficial effects of the present invention are:

[0027] In the present invention, the furnace hood is made of high-temperature resistant material to ensure normal operation without damage in a high-temperature environment. It is arranged on the outside of the furnace body with a certain distance between it and the furnace body. The mounting platform is located on the upper part of the furnace hood and above the furnace body. The mounting platform and the upper part of the furnace body maintain a certain distance to provide space for the rotation of the furnace body and prevent excessive heat transfer.

[0028] The first pipeline is annular and is arranged on the mounting platform, located below the mounting platform and above the furnace body. The inert gas enters the first pipeline through the pipeline outside the furnace cover. The inert gas adopts the treated waste flue gas of the industrial heating furnace or hot blast furnace, which belongs to the waste gas recycling. After the inert gas enters the first pipeline, a part of it is blown to the furnace body through the first air hole, and the blowing part is located on the side of the furnace mouth. However, the air curtain formed by blowing the inert gas only through the first pipeline may be concentrated in a smaller area instead of being evenly distributed around the entire furnace mouth. This may lead to uneven formation of the air curtain and fail to effectively isolate the air from entering the converter. If the air flow cannot be evenly distributed, in order to ensure the effectiveness of the air curtain, it may be necessary to increase the gas flow or pressure, which will lead to increased energy consumption. The direct impact of high-pressure gas on the edge of the furnace mouth may also lead to ineffective gas loss, further increasing energy consumption. When setting the gas recovery port, the air curtain generated only through the first pipeline may be sucked away by the exhaust gas, affecting the effect and time of the air curtain formation.

[0029] Therefore, a second pipeline is set up, and another part of the inert gas in the first pipeline will enter the second pipeline. The orderly gas introduction method can reduce the gas overlap and waste that may occur when supplying gas to two ring pipes separately, and can achieve better protection effect with less inert gas. The diameter of the second pipeline is larger than that of the first pipeline, and it is farther away from the furnace mouth than the first pipeline, so that the inert gas ejected from the second air hole can cover a larger area, which helps to more comprehensively block the air from entering the furnace mouth, reduce the contact between air and CO in high-temperature flue gas, and thus improve the content and purity of CO in converter gas recovery. The second pipeline is located below the first pipeline. The inert gas ejected from the second air hole is biased towards the furnace body on the side of the furnace mouth, and intersects with the inert gas ejected from the first air hole, which can complement and enhance each other, and can change the direction of the inert gas ejected from the first air hole to a certain extent, forming a gas curtain toward the middle of the furnace mouth. In the process of inert gas recovery, the inert gas forming the gas curtain is relatively less affected, forming a more stable and uniform gas curtain. For example, when the airflow near the furnace mouth is disturbed and becomes locally unstable, the cross airflow can quickly fill the gap and maintain a good isolation effect. In addition, since the second pipeline is located below the first pipeline and has a larger diameter, it can play a certain role in buffering and guiding the gas ejected from the first pipeline. This prevents the high-pressure gas ejected from the first pipeline from directly impacting the edge of the furnace mouth and causing ineffective loss, thereby improving the utilization efficiency of the gas and reducing energy consumption.

[0030] The treated industrial heating furnace or hot blast furnace waste flue gas can be transported to the first pipeline by an induced draft fan. Preferably, the industrial heating furnace or hot blast furnace waste flue gas is treated and meets the national emission standards, and the flue gas oxygen content is less than 5%. For reference, the diameters of the first pipeline and the second pipeline are designed to be 300-600 mm according to the different steel output of the converter. Furthermore, the stable air curtain formed by the first pipeline and the second pipeline forms an inert gas isolation zone at the upper part of the furnace mouth. Without affecting the normal smelting of the converter, the converter gas and air are isolated, which can significantly reduce the chance of oxygen in the air contacting with the high-temperature flue gas in the furnace, reduce the combustion of the converter gas, reduce the oxidation of CO, thereby increasing the content of CO in the recovered converter gas and increasing the calorific value of the gas. Compared with a single pipeline, the design of the double-layer pipeline can more effectively utilize the inert gas, reduce unnecessary gas waste, and reduce the overall energy consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2It is a schematic diagram of the internal structure of the furnace cover, vaporization flue and furnace body of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of the spray gun of the present invention;

[0035] Figure 4 It is a schematic diagram of the data curve of the present invention.

[0036] In the figure: 1. furnace body; 101. furnace mouth; 2. furnace hood; 201. mounting platform; 3. first pipeline; 301. first air hole; 4. second pipeline; 401. second air hole; 5. first baffle; 6. second baffle; 7. guide groove; 8. smoke hood; 801. baffle; 9. vaporization flue; 10. spray gun; 1001. inner tube; 1002. outer tube; 1003. first nozzle; 1004. first circulation part; 1005. second circulation part; 1006. third circulation part; 1007. second nozzle; 11. storage bin; 12. dust collection device; 13. distributor. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0039] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] Reference Figure 1~Figure 4 , a converter gas recovery device is proposed, which is used to recover the flue gas produced from the furnace mouth 101 of the furnace body 1, comprising:

[0042] A furnace cover 2, which is sleeved on the outside of the furnace body 1 and has a mounting platform 201, and the mounting platform 201 is located above the furnace body 1;

[0043] A first pipeline 3, which is annular and disposed on the mounting platform 201, wherein the annular diameter of the first pipeline 3 is greater than the diameter of the furnace opening 101, and the first pipeline 3 is used to introduce inert gas, and the first pipeline 3 has a plurality of first air holes 301, and the first air holes 301 face the furnace body 1;

[0044] The second pipeline 4 is annular and is located below the first pipeline 3 and above the furnace body 1. The annular diameter of the second pipeline 4 is larger than the annular diameter of the first pipeline 3. The second pipeline 4 is connected to the first pipeline 3. The second pipeline 4 has a plurality of second air holes 401. The second air holes 401 face the furnace body 1 and the inert gas ejected therefrom crosses with the inert gas ejected from the first air holes 301.

[0045] In this embodiment, the furnace hood 2 is made of high-temperature resistant material to ensure normal operation without damage in a high-temperature environment. It is arranged on the outside of the furnace body 1 with a certain distance between it and the furnace body 1. The mounting platform 201 is located on the upper part of the furnace hood 2 and above the furnace body 1. The mounting platform 201 maintains a certain distance from the upper part of the furnace body 1 to provide space for the rotation of the furnace body 1 and prevent excessive heat transfer.

[0046] The first pipeline 3 is annular and is arranged on the mounting platform 201, located below the mounting platform 201 and above the furnace body 1. The inert gas enters the first pipeline 3 through the pipeline outside the furnace cover 2. The inert gas adopts the treated waste flue gas of the industrial heating furnace or the hot blast furnace, which belongs to the waste gas recycling. After the inert gas enters the first pipeline 3, a part of it is blown to the furnace body 1 through the first air hole 301, and the blowing part is located on the peripheral side of the furnace mouth 101. However, the air curtain formed by blowing the inert gas only through the first pipeline 3 may be concentrated in a smaller area instead of being evenly distributed around the entire furnace mouth 101. This may lead to uneven formation of the air curtain, which cannot effectively isolate the air from entering the converter. If the air flow cannot be evenly distributed, in order to ensure the effectiveness of the air curtain, it may be necessary to increase the gas flow or pressure, which will lead to increased energy consumption. The high-pressure gas directly impacting the edge of the furnace mouth 101 may also lead to ineffective gas loss, further increasing energy consumption. When the gas recovery port is set, the air curtain generated only through the first pipeline 3 may be sucked away by the exhaust gas, affecting the effect and time of the air curtain formation.

[0047] Therefore, a second pipeline 4 is provided, and another part of the inert gas in the first pipeline 3 will enter the second pipeline 4. The orderly gas introduction method can avoid gas overlap and waste that may occur when gas is supplied to two ring pipes separately, and can achieve better protection effect with less inert gas. The diameter of the second pipeline 4 is larger than the diameter of the first pipeline 3, and is farther away from the furnace port 101 relative to the first pipeline 3, so that the inert gas ejected from the second air hole 401 can cover a larger area, which helps to more comprehensively block air from entering the furnace port 101, reduce the contact between air and CO in the high-temperature flue gas, and thus improve the content and purity of CO in the converter gas recovery. The second pipeline 4 is located below the first pipeline 3. The inert gas ejected from the second air hole 401 is biased toward the furnace body 1 on the side of the furnace mouth 101, and crosses with the inert gas ejected from the first air hole 301, which can complement and enhance each other, and can change the direction of the inert gas ejected from the first air hole 301 to a certain extent, forming a gas curtain toward the middle of the furnace mouth 101. In the process of inert gas recovery, the inert gas forming the gas curtain is relatively less affected, forming a more stable and uniform gas curtain. For example, when the airflow near the furnace mouth 101 is disturbed and locally unstable, the crossed airflow can quickly fill the gap and maintain a good isolation effect. Moreover, since the second pipeline 4 is located below the first pipeline 3 and has a larger diameter, it can play a certain buffering and guiding role on the gas ejected from the first pipeline 3. It prevents the high-pressure gas ejected from the first pipeline 3 from directly impacting the edge of the furnace mouth 101 and causing ineffective loss, thereby improving the utilization efficiency of the gas and reducing energy consumption.

[0048] The treated industrial heating furnace or hot blast furnace waste flue gas can be transported to the first pipeline 3 by using an induced draft fan. Preferably, the industrial heating furnace or hot blast furnace waste flue gas is treated and meets the national emission standards, and the flue gas oxygen content is less than 5%. For reference, the diameters of the first pipeline 3 and the second pipeline 4 are designed to be 300-600 mm according to the different steel output of the converter. Furthermore, the stable air curtain formed by the first pipeline 3 and the second pipeline 4 forms an inert gas isolation zone at the upper part of the furnace mouth 101, and the converter gas is isolated from the air without affecting the normal smelting of the converter. The opportunity of oxygen in the air contacting with the high-temperature flue gas in the furnace can be significantly reduced, and the combustion of the converter gas and the oxidation of CO can be reduced, thereby increasing the content of CO in the recovered converter gas and increasing the calorific value of the gas. Compared with a single pipeline, the design of the double-layer pipeline can more effectively utilize the inert gas, reduce unnecessary gas waste, and reduce the overall energy consumption of the system.

[0049] Furthermore, it also includes: a first baffle 5 and a second baffle 6, the first baffle 5 and the second baffle 6 are cylindrical, both are arranged on the mounting platform 201, the inner diameter of the first baffle 5 is larger than the inner diameter of the second baffle 6, a guide groove 7 is formed between the first baffle 5 and the second baffle 6, the first pipeline 3 is located in the guide groove 7, and the guide groove 7 is vertically arranged toward the furnace body 1 on the outer peripheral side of the furnace mouth 101.

[0050] In this embodiment, the first baffle 5 and the second baffle 6 are both cylindrical, and a guide groove 7 is formed between the first baffle 5 and the second baffle 6 due to the different inner diameters. The first pipeline 3 is located in the guide groove 7, and the guide groove 7 is arranged vertically, which can guide the flow direction of the inert gas, maintain the stability of the gas curtain, and reduce the interference of the surrounding environment.

[0051] In addition, since a large amount of dust is produced during the production process of converter gas, this dust often has strong adhesion and permeability, and is extremely easy to clog the first pore 301 and the second pore 401. Once the pores are blocked, it will not only cause equipment failure and affect normal production and use, but also greatly increase the maintenance cost of the equipment. Therefore, it is preferred that the length of the first baffle 5 and the second baffle 6 is greater than 1.5 times the diameter of the first pipeline 3, which can prevent dust clogging, and the longer first baffle 5 and the second baffle 6 can act as a barrier to reduce the direct impact of dust on the first pipeline 3, thereby protecting the first pipeline 3. Thereby, the maintenance cost of the equipment can be reduced, while also reducing the downtime caused by maintenance, thereby improving the availability and production efficiency of the equipment.

[0052] Furthermore, the length of the first baffle 5 is greater than the length of the second baffle 6 .

[0053] In this embodiment, the length of the first baffle 5 is greater than that of the second baffle 6, so that the first baffle 5 is away from the furnace opening 101 and close to the gas shielding of the furnace cover 2, so that the gas flowing out of the first pipeline 3 can be partially blocked by the first baffle 5 which is longer than the second baffle 6, and flows to the inside near the furnace opening 101, so as to prevent the inert gas such as industrial waste gas from being quickly taken away by the air suction port of the converter secondary dust removal system. The distribution of the inert gas is optimized to a certain extent. The inert gas is more evenly concentrated at the position close to the furnace opening 101, which improves the utilization efficiency of the inert gas and further enhances the isolation effect of the high-temperature flue gas in the furnace and the outside air.

[0054] In actual production scenarios, if the first baffle 5 and the second baffle 6 are of the same length or the first baffle 5 is shorter, the inert gas flowing out of the first pipeline 3 may be directly attracted by the powerful secondary dust removal system suction port due to lack of effective shielding and guidance, thereby failing to form a stable and effective air curtain around the furnace opening 101. When the length of the first baffle 5 is greater than that of the second baffle 6, the flow path of the inert gas can be effectively changed to concentrate it in the area where the air curtain needs to be formed, thereby enhancing the stability and barrier effect of the air curtain.

[0055] Furthermore, the second pipeline 4 is disposed on the first baffle plate 5 , and is located on a side of the first baffle plate 5 away from the furnace opening 101 .

[0056] In this embodiment, the second pipeline 4 is arranged on the side of the first baffle 5 away from the furnace port 101, which can avoid heat transfer. Since the temperature near the furnace port 101 is extremely high, if the second pipeline 4 is close to the furnace port 101, a large amount of heat will be quickly transferred to the second pipeline 4, which may cause its performance to deteriorate or even be damaged. The arrangement away from the furnace port 101 greatly reduces the impact of heat and ensures the normal operation and service life of the second pipeline 4. In addition, the first baffle 5 can shield and protect the second pipeline 4, which can prevent dust from affecting the second pipeline 4, reduce dust accumulation, reduce maintenance frequency, and improve the reliability and service life of the equipment.

[0057] Furthermore, the diameter of the second pipeline 4 is smaller than the diameter of the first pipeline 3 .

[0058] In this embodiment, after the inert gas in the first pipeline 3 enters the second pipeline 4, the pressure on the gas increases due to the smaller diameter, so that it can flow out at a faster flow rate at the second air hole 401. In the case of strong external air flow interference, the faster flow rate of the inert gas can more effectively resist external interference, quickly fill the weak areas that may appear in the air curtain, and ensure the integrity and stability of the air curtain. If the diameter of the second pipeline 4 is the same as or larger than that of the first pipeline 3, the flow rate of the inert gas in the second pipeline 4 may decrease, resulting in insufficient impact force when it is ejected, and it is difficult to form a stable and effective air curtain. When the diameter of the second pipeline 4 is smaller than the diameter of the first pipeline 3, the energy and speed of the inert gas when it is ejected can be significantly enhanced, making the air curtain more compact and stable, and better playing the role of isolating air and improving the quality of converter gas recovery.

[0059] Furthermore, it also includes:

[0060] The smoke hood 8 is lifted and lowered on the mounting platform 201 and is located above the furnace opening 101. After moving, it is close to or away from the furnace opening 101. The smoke hood 8 has a blocking portion 801. The blocking portion 801 is conical. The diameter of the blocking portion 801 gradually decreases from close to the furnace opening 101 to away from the furnace opening 101, and is smaller than the diameter of the second baffle 6.

[0061] In this embodiment, the lifting arrangement of the smoke hood 8 allows it to be close to or away from the furnace mouth 101 according to actual needs, so as to provide space for the rotation of the furnace body 1 or form an effective shielding, reduce the interference and influence of the external environment on the gas in the furnace, and the conical baffle 801 can provide a good guiding effect for the gas escaping from the furnace mouth 101. When the gas in the furnace rises, the special shape of the baffle 801 guides the gas to flow more concentratedly and orderly, so that the gas can enter the next step more smoothly. In the actual production process, if there is no guidance from the smoke hood 8 and its conical baffle 801, the gas escaping from the furnace may spread everywhere, which not only leads to energy waste, but also may affect the collection and treatment effect of the gas in the subsequent process. With the shielding and guidance of the smoke hood 8, the gas can be transported to the designated location more efficiently, improving the efficiency and stability of the entire process.

[0062] Furthermore, it also includes: a vaporization flue 9, which is arranged on a mounting platform 201 and connected to a furnace mouth 101; a spray gun 10, which is arranged on a side wall of the vaporization flue 9 and extends into the vaporization flue 9, and the spray gun 10 has an inner tube 1001; a storage bin 11, which is used to store dust ash; a dust collection device 12, which has an air suction port and an air outlet, and the air suction port is connected to the furnace cover 2, and is located on the lower side of the first baffle 5, and is used to extract inert gas from the first pipeline 3 and the second pipeline 4. The inert gas enters the air outlet through the dust collection device 12, and the air outlet is connected to the storage bin 11. Part of the inert gas drives the dust ash to enter the inner tube 1001.

[0063] In this embodiment, CO2 will be generated in the flue gas during the converter smelting process, and the CO burned at the furnace mouth 101 will also generate CO2, increasing the amount of CO2 emissions. The large amount of CO and CO2 emitted to the outside is inconsistent with the environmental protection policy of energy conservation, emission reduction, and carbon reduction.

[0064] Dust ash is also called coking dust ash, which is obtained by collecting the dust-containing flue gas generated in the coking production process through a bag dust collector. The dust ash mentioned in this article also includes carbon-containing solid waste, which is also a kind of dust ash in the material yard and sintering feeding system. The dust ash collected by the dust collector is stored in a storage bin 11, which reuses the solid waste and generates extremely high economic value.

[0065] The vaporization flue 9 is a reaction flow place for converter gas, which is arranged on the mounting platform 201 and located above the furnace body 1 , and is used to process the high-temperature flue gas discharged from the furnace port 101 .

[0066] The spray gun 10 is the core equipment of the high-temperature flue gas dust removal ash blowing technology. It is installed on the vaporization flue 9. The converter-specific blowing spray gun 10 can withstand 1400 degrees and has an inner tube 1001. The inner tube 1001 is a two-phase material channel for dust removal ash (coal powder) and inert gas (or protective gas). It is used to spray the dust removal ash in the inner tube 1001 into the vaporization flue 9 to consume O2 in the converter gas.

[0067] The exhaust port of the dust collection device 12 is connected to the inside of the furnace hood 2, and the inert gas ejected from the first pipeline 3 and the second pipeline 4 is collected and dusted. The inert gas after treatment may have a temperature of hundreds of degrees Celsius due to the influence of the circulation time and the ambient temperature near the furnace body 1. Most of the inert gas is retained for standby after dust removal in the dust collection device 12, and a small part of the inert gas is ejected at the gas outlet and drives the dust ash in the storage bin 11 to move to the distributor 13. The distributor 13 can be a conventional device in the field, which will not be described in detail. The distributor 13 further sends the dust ash to the inner tube 1001 of the spray gun 10 to achieve dense phase transportation and reduce the wear on the pipeline. The inert gas with hundreds of degrees Celsius will generate heat transfer to the dust ash that is about to be sprayed into the vaporization flue 9 to participate in the reaction during the contact process with the dust ash, and preheat it, so that the dust ash has a certain temperature when entering the vaporization flue 9, thereby improving the reaction efficiency. In actual production operation, if there is no such preheating mechanism, the dust ash will have a lower temperature when entering the vaporization flue 9, and it may take longer time and more energy to reach the conditions required for the reaction, thereby affecting the efficiency and economy of the entire process. The preheating of the dust ash by the inert gas ejected from the outlet of the dust collection device 12 greatly shortens the start-up time of the reaction, reduces energy consumption, and improves production efficiency and product quality.

[0068] After the converter flue gas enters the vaporization flue 9, the temperature is about 1200~1600℃. The main components of the converter gas are generally (volume fractions) CO is 45~65%, H2<2%, CO2 is 15~25%, O2 is 0.4~0.8%, and N2 is 24~38%. A spray gun 10 is installed at the inlet section of the vaporization flue 9 to allow the carbon-containing dust to be fully mixed with the converter high-temperature flue gas, forming a high-temperature (1400℃) + reducing atmosphere in the vaporization flue 9, so that the C in the dust reacts with CO2 to generate CO. The reaction equation is as follows:

[0069] 2C+O2(g)=2CO(g) →ΔrG1;

[0070] C+CO2(g)=2CO(g)→ΔrG2;

[0071] C(s) + O2= CO2→ΔrG3;

[0072] 2CO +O2 = 2CO2 → ΔrG4.

[0073] refer to Figure 4 When the flue gas temperature is greater than T0=983.06K, the Gibbs free energy changes of the four reactions in the system are all less than zero. Under this condition, the four main chemical reactions can proceed spontaneously in the forward direction. Since ΔrG2<ΔrG3<ΔrG4<ΔrG1, the tendency of C in the dust ash to react with O2 in the flue gas to generate CO is the greatest. Therefore, dust ash is sprayed into the converter vaporization flue 9 to make C react with O2 and CO2 in the flue gas to generate CO under the high temperature conditions of the vaporization flue 9, thereby improving the gas recovery amount and quality.

[0074] Furthermore, the end of the spray gun 10 extends into the vaporization flue 9 and also has an outer tube 1002, which is used to introduce inert gas at room temperature. The outer tube 1002 is eccentrically sleeved on the inner tube 1001, and the inner tube 1001 is arranged in the outer tube 1002 at a position away from the bottom of the vaporization flue 9.

[0075] In this embodiment, due to the limitation of the working environment, the end of the spray gun 10 needs to extend into the vaporization flue 9, and must meet the requirements of flexible control, high temperature resistance, uniform mixing, and short spraying distance. In order to solve the problem of short service life of the spray gun 10 in the related technology, an outer tube 1002 is sleeved on the outer side of the inner tube 1001, and the outer tube 1002 is used to pass inert gas at room temperature, which has a cooling effect and protects the inner tube 1001 extending into the vaporization flue 9.

[0076] The outer tube 1002 and the inner tube 1001 together form a sleeve-type spray gun 10. At the same time, the inner tube 1001 and the outer tube 1002 are arranged circumferentially, and the inner tube 1001 is eccentrically arranged in the outer tube 1002 at a position away from the bottom of the vaporization flue 9, that is, the distance from the axis of the inner tube 1001 to the upper part of the outer tube 1002 is smaller than the distance to the lower part of the outer tube 1002, which means that the lower part is thicker, and the thicker thickness will also have a better protection effect during the high-temperature gas flow from bottom to top in the vaporization flue 9.

[0077] Furthermore, the outer tube 1002 has a first nozzle 1003, which is divided into a first flow portion 1004, a second flow portion 1005 and a third flow portion 1006 which are connected in sequence, the width of the second flow portion 1005 is smaller than the width of the first flow portion 1004, the width of the first flow portion 1004 is smaller than the width of the third flow portion 1006 away from one end of the second flow portion 1005, and the inner tube 1001 has a second nozzle 1007, which is fan-shaped.

[0078] In this embodiment, the first circulation part 1004, the second circulation part 1005 and the third circulation part 1006 form a Laval structure, and the inert or protective gas is discharged from the Laval nozzle. The pressure of the supersonic jet-induced nozzle area is lower than both the surrounding gas pressure and the gas pressure ejected from the inner tube 1001. The obtained pressure difference enables the gas-solid phase material entering the low-pressure area to be rapidly mixed with the external gas instantly, completing the rapid mixing of the dust removal ash and the flue gas. At the same time, due to the eccentric arrangement of the outer tube 1002 and the inner tube 1001, it can be avoided that the cooling airflow after the dust removal ash is ejected will wrap the dust removal ash in the middle, affecting the dispersion of the dust removal ash. The second nozzle 1007 adopts a fan-shaped output to ensure that the dust removal ash powder is fully mixed with the flue gas. In addition, the injection speed and injection distance are reduced to avoid the accumulation of carbon powder in the vaporization flue 9, which affects the heat exchange efficiency.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A converter gas recovery device for recovering flue gas produced from a furnace port (101) of a furnace body (1), characterized in that: include: A furnace cover (2), the furnace cover (2) being sleeved on the outside of the furnace body (1) and having a mounting platform (201), the mounting platform (201) being located above the furnace body (1); a first pipeline (3), the first pipeline (3) being annular and arranged on the mounting platform (201), the annular diameter of the first pipeline (3) being larger than the diameter of the furnace opening (101), the first pipeline (3) being used to introduce inert gas, the first pipeline (3) having a plurality of first air holes (301), the first air holes (301) facing the furnace body (1); a second pipeline (4), the second pipeline (4) being annular and being located below the first pipeline (3) and above the furnace body (1), the annular diameter of the second pipeline (4) being larger than the annular diameter of the first pipeline (3), the second pipeline (4) being in communication with the first pipeline (3), the second pipeline (4) having a plurality of second air holes (401), the second air holes (401) facing the furnace body (1) and the inert gas ejected from the second air holes (401) crossing the inert gas ejected from the first air holes (301); a first baffle (5) and a second baffle (6), wherein the first baffle (5) and the second baffle (6) are cylindrical and are both arranged on the mounting platform (201); the inner diameter of the first baffle (5) is larger than the inner diameter of the second baffle (6); a guide groove (7) is formed between the first baffle (5) and the second baffle (6); the first pipeline (3) is located in the guide groove (7); the guide groove (7) is arranged vertically and faces the furnace body (1) at the outer peripheral side of the furnace opening (101); The length of the first baffle (5) is greater than the length of the second baffle (6); The second pipeline (4) is arranged on the first baffle (5) and is located on a side of the first baffle (5) away from the furnace opening (101); The diameter of the second pipeline (4) is smaller than the diameter of the first pipeline (3).

2. A converter gas recovery device according to claim 1, characterized in that: Also includes: A smoke hood (8), wherein the smoke hood (8) is lifted and arranged on the mounting platform (201) and is located above the furnace opening (101), and moves closer to or farther away from the furnace opening (101); the smoke hood (8) has a blocking portion (801), and the blocking portion (801) is conical, and the diameter of the blocking portion (801) gradually decreases from being closer to the furnace opening (101) to being farther away from the furnace opening (101), and is smaller than the diameter of the second baffle (6).

3. The converter gas recovery device according to claim 1, characterized in that: Also includes: a vaporization flue (9), the vaporization flue (9) being arranged on the mounting platform (201) and being in communication with the furnace opening (101); A spray gun (10), the spray gun (10) being arranged on a side wall of the vaporization flue (9) and extending into the vaporization flue (9), the spray gun (10) having an inner tube (1001); A storage bin (11) for storing dust removed ash; a dust collection device (12), the dust collection device (12) having an air suction port and an air outlet, the air suction port being connected to the furnace hood (2), being located on one side below the first baffle (5), and being used to extract inert gas from the first pipeline (3) and the second pipeline (4), the inert gas passing through the dust collection device (12) entering the air outlet, and the air outlet being connected to the storage bin (11); The inert gas drives the dust removal ash into the distributor (13), and the distributor (13) transports the dust removal ash to the inner tube (1001).

4. The converter gas recovery device according to claim 3, characterized in that: The end of the spray gun (10) extends into the vaporization flue (9), and also has an outer tube (1002). The outer tube (1002) is used to introduce inert gas at room temperature. The outer tube (1002) is eccentrically sleeved on the inner tube (1001). The inner tube (1001) is arranged in the outer tube (1002) at a position away from the bottom of the vaporization flue (9).

5. The converter gas recovery device according to claim 4, characterized in that: The outer tube (1002) has a first nozzle (1003), the first nozzle (1003) is divided into a first flow section (1004), a second flow section (1005) and a third flow section (1006) which are connected in sequence, the width of the second flow section (1005) is smaller than the width of the first flow section (1004), the width of the first flow section (1004) is smaller than the width of the third flow section (1006), and the inner tube (1001) has a second nozzle (1007).

6. The converter gas recovery device according to claim 5, characterized in that: The second nozzle (1007) is fan-shaped.

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