Converter gas high-valued total recovery system

Abstract

The utility model discloses a converter mouth inert gas isolation device, a converter high-temperature flue gas coking fly ash blowing device and a converter gas high-valued total recovery system comprehensively utilizing the two devices. According to the converter mouth inert gas isolation device, industrial waste gas is used for establishing a converter mouth isolation measure in the converter smelting process, and gas fuel is reduced; according to the converter high-temperature flue gas coking fly ash injection device, carbon-containing fly ash is injected to converter high-temperature flue gas, so that the calorific value of coal gas can be increased, industrial solid waste can be fully utilized, and extremely high economic value is generated. The converter gas utilization rate can be greatly increased, emission of CO and CO2 is reduced, and then atmospheric pollution is reduced.

Description

Technical Field

[0001] The present application relates to a converter gas recovery system, belonging to the field of steelmaking. 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. However, the existing converter gas recovery still has the following defects:

[0003] 1. Limited by equipment level, operating system and raw material level, converter gas recovery generally has low recovery rate, short recovery time and low CO content in the recovered gas. In addition, the unrecoverable converter flue gas is discharged into the atmosphere after treatment, and the CO and CO contained in it are 2 Will have a great impact on the environment.

[0004] 2. Before entering the vaporization flue, the high-temperature flue gas of the converter will first come into contact with air at the converter mouth. This will cause 10% to 15% of the CO contained in the flue gas to burn and produce CO at a high temperature above 1500°C. 2 This results in a low CO content in the converter gas after recovery, resulting in a large loss of usable energy.

[0005] 2. During the converter smelting process, the flue gas generated will contain CO 2 , and the CO burned at the furnace mouth will also generate CO 2 , both make CO 2 The amount of emissions has increased. And the large amount of CO and CO 2 External emissions are inconsistent with the energy conservation, emission reduction and carbon reduction in environmental protection policies. Utility Model Content

[0006] To solve the above problems, according to the first aspect of the present application, a converter mouth inert gas isolation device is provided. As an isolation device for the converter mouth during the converter smelting process, industrial waste gas (nitrogen, heating furnace waste flue gas or hot blast furnace industrial waste gas, etc.) is transported to the converter through a pipeline, and air isolation measures are added at the furnace mouth. On the one hand, the contact between flue gas and air is minimized, thereby reducing CO combustion and increasing the calorific value of gas recovery; on the other hand, the release time is shortened so that the converter gas meets the gas recovery conditions from the beginning of self-blowing, which can greatly increase the gas recovery volume.

[0007] The converter furnace mouth inert gas isolation device comprises: an induced draft fan, an annular injection pipeline, and an annular isolation chamber; the induced draft fan is connected to the converter upper platform pipeline; the annular injection pipeline is installed below the converter upper platform and connected to the annular isolation chamber; the annular isolation chamber is installed at the converter furnace mouth and is located outside the movable smoke hood, the bottom of the annular isolation chamber is connected to the hot blast furnace exhaust gas isolation layer, and a high-pressure gas seal is installed;

[0008] The induced draft fan is used to extract the treated flue gas that meets the standards. The flue gas that meets the standards is transported to the upper platform of the converter through the pipeline and valve connected to the induced draft fan to be reused at the converter furnace mouth;

[0009] The annular injection pipeline is used to provide qualified flue gas to the annular isolation chamber;

[0010] The annular isolation chamber is used to form an inert gas isolation zone at the converter furnace mouth using the qualified flue gas.

[0011] Optionally, the diameter of the annular blowing pipeline is set to 300-600 mm according to the output of the converter.

[0012] According to the second aspect of the present application, a converter high-temperature flue gas coking dust blowing device is provided, which adds a blowing measure at the inlet section of the vaporization flue, uses coking dust and carbon-containing solid waste to consume the O in the converter gas. 2 The system is linked with the converter smelting. According to the smelting conditions and the carbon content of the dust ash solid waste, the injection process is adjusted in time, and an appropriate amount of coking dust ash is injected into the converter high-temperature flue gas to complete the automatic adjustment and control of the injection. In this way, O2 is quickly consumed in the converter flue gas (high temperature of 1400℃) and the reducing environment, and the carbon in the dust ash is mixed with the CO in the converter flue gas. 2 A reduction reaction occurs to generate CO (C+CO 2 =2CO), which can greatly increase the CO content of coal gas and improve the calorific value of coal gas.

[0013] The converter high-temperature flue gas coking dust removal ash blowing device comprises a plurality of converter-specific blowing guns, an automatic adjustment control module for converter smelting, a furnace front blowing distribution module, and a dust removal ash blowing tank; the converter-specific blowing gun is installed on the vaporization flue of the converter and is connected to the furnace front blowing distribution module through a blowing pipeline; the furnace front blowing distribution module is installed at the rear end of the blowing pipeline and is connected to the dust removal ash blowing tank through a pneumatic conveying pipeline;

[0014] The converter-specific blowing gun is used to blow dust, so that the carbon-containing dust is fully mixed with the converter high-temperature flue gas to react and generate CO;

[0015] The automatic adjustment control module of the converter smelting is used to control the dust removal ash injection amount and injection timing of the converter special injection gun;

[0016] The pre-furnace blowing distribution module is used to provide dust removal ash powder to the converter-specific blowing gun, ensuring that the dust removal ash blowing amount of each converter-specific blowing gun is the same.

[0017] Optionally, the converter-specific blowing gun includes an inner tube and an outer tube which are interconnected; the inner tube is a two-phase material channel for dust ash and inert or protective gas, and the outer tube is an inert or protective gas channel; the inert or protective gas is discharged through a Laval nozzle between the inner tube and the outer tube to form a supersonic jet, inducing the pressure in the nozzle area to be lower than both the surrounding gas pressure and the core dust ash gas pressure, and the resulting pressure difference allows the gas-solid phase material entering the low-pressure area to instantly mix rapidly with the external gas, thereby completing the rapid mixing of dust ash and flue gas.

[0018] Preferably, the inner tube and the outer tube are eccentrically arranged up and down to prevent the cooling airflow from wrapping the dust in the middle after the dust is sprayed out, thereby affecting the dispersion of the dust.

[0019] Preferably, the nozzle of the converter-specific blowing gun adopts an analog design and a fan-shaped output to ensure that the carbon-containing dust is fully mixed with the flue gas, while reducing the injection speed and injection distance to avoid the accumulation of carbon powder in the vaporization flue and affect the heat exchange efficiency.

[0020] Optionally, the automatic adjustment control module of the converter smelting is used to adjust the temperature of the converter high temperature flue gas according to the smelting time, the converter high temperature flue gas temperature curve, the converter high temperature flue gas O 2 Content curve, converter high temperature flue gas CO content curve, converter high temperature flue gas CO 2 The content curve is designed to automatically control the dust ash injection of the converter special injection gun, and the dust ash injection amount and injection timing are customized according to actual conditions.

[0021] Optionally, the pre-furnace blowing distribution module adopts a special distributor device for the converter, and a distribution chamber is fixedly connected to the bottom of the connecting pipe. The distribution chamber is a conical structure with a ring-shaped cross-section. A power structure chamber is arranged inside the ring-shaped cross-section of the distribution chamber. When the gas-powder mixture moves along the path of the connecting pipe, the distribution chamber and the distribution pipe, power is provided to the carbon-containing dust removal ash through the piston rod, the cylinder body and the piston body, so that the carbon-containing dust removal ash remains floating in the gas-powder mixture, preventing its accumulation, thereby improving the use effect and ensuring even distribution.

[0022] Optionally, the upper part of the dust removal ash spraying tank is provided with upper and lower pneumatic bell valves, and the first discharge port below is provided with a continuously adjustable feeder; the dust removal ash spraying tank is provided with a spraying station storage bin and a spraying tank internal pressure equalizing device; the lower part of the spraying station storage bin is connected to the furnace front spray distribution module through a pneumatic conveying pipeline;

[0023] The continuously adjustable feeder is used to input carbon-containing dust into the dust spraying tank and control the powder feeding amount;

[0024] The storage bin of the blowing station is used to store carbon-containing dust;

[0025] The internal pressure equalizing device of the spray tank is used to ensure the internal pressure of the dust removal ash spray tank is balanced;

[0026] The high-pressure nitrogen inlet is connected to the air inlet of the dust ash spraying tank through the first nitrogen pipeline. The first nitrogen pipeline is also provided with a fluidizing device for introducing high-pressure nitrogen and fluidized nitrogen into the dust ash spraying tank, and using the high-pressure nitrogen to make the carbon-containing dust ash in the dust ash spraying tank enter the pneumatic conveying pipeline;

[0027] The high-pressure nitrogen inlet is connected to the pneumatic conveying pipeline through the second nitrogen pipeline; the second discharge port of the dust removal ash blowing tank is merged with the second nitrogen pipeline through the discharge pipeline and connected to the pneumatic conveying pipeline together. The second nitrogen pipeline is used to provide a small amount of conveying gas as a carrier, and the carbon-containing dust removal ash output from the second discharge port is transported along the pneumatic conveying pipeline to the front-of-furnace blowing distribution module to realize dense phase transportation and reduce wear on the pipeline.

[0028] Optionally, the carbon-containing dust ash adopts coking dust ash and carbon-containing solid waste; the coking dust ash is obtained by collecting the dust-containing flue gas generated in the coking production process through a dust collector; the carbon-containing solid waste is a kind of dust ash from the material yard and sintering feeding system.

[0029] Optionally, the continuously adjustable feeder includes a rotary powder feeder, a drive motor, and a frequency converter cabinet connected in sequence; the frequency converter cabinet adjusts the rotation of the rotary powder feeder by controlling the drive motor to adjust the powder feeding amount of the carbon-containing dust ash.

[0030] Optionally, the control parameters of the frequency converter cabinet are calculated by the automatic adjustment control module of the converter smelting according to the required powder feeding amount of carbon-containing dust removal ash.

[0031] According to the third aspect of the present application, a high-value full recovery system for converter gas is provided, comprising the above-mentioned converter mouth inert gas isolation device and the converter high-temperature flue gas coking dust removal ash blowing device; wherein, the converter high-temperature flue gas coking dust removal ash blowing device is connected to the converter smelting workshop, and the converter mouth inert gas isolation device is installed in the converter platform converter furnace body protective wall. Under the premise of not affecting the normal smelting of the converter, a circle of inert gas protection layer is formed at the converter mouth to complete the isolation of the converter gas from the air, thereby reducing the combustion of the converter gas and improving the calorific value of the gas.

[0032] Optionally, the inert gas may be treated waste gas from an industrial heating furnace or a hot blast furnace, which is waste gas recycling.

[0033] The beneficial effects of this application include:

[0034] 1) The converter mouth inert gas isolation device provided in the present application utilizes industrial waste gas to establish a furnace mouth isolation measure during the converter smelting process to reduce coal gas (CO) combustion.

[0035] 2) The converter high-temperature flue gas coking dust ash injection device provided in the present application increases the calorific value of coal gas by injecting carbon-containing dust ash into the converter, and at the same time utilizes industrial solid waste to generate extremely high economic value.

[0036] 3) The converter gas high-value full recovery system provided in this application can significantly improve the converter gas utilization rate and reduce CO and CO 2 emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of an inert gas isolation device at a converter furnace mouth in one embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of the structure of a converter high-temperature flue gas coking dust removal ash injection device in one embodiment of the present application;

[0039] Figure 3 This is a simulation diagram of the reduction reaction of a converter high-temperature flue gas coking dust removal ash injection device in one embodiment of the present application.

[0040] List of parts and reference numerals:

[0041] 1- Vaporization flue; 2- Annular injection pipeline; 3- Annular isolation chamber; 4- Hot blast furnace exhaust gas isolation layer; 5- Movable smoke hood; 6- High-pressure gas seal; 7- Special injection gun for converter; 8- Front-furnace injection distribution module; 9- Pneumatic conveying pipeline; 10- Dust removal ash injection tank; 11- Continuously adjustable feeder. DETAILED DESCRIPTION

[0042] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0043] like Figure 1As shown, in one embodiment, the converter furnace mouth inert gas isolation device of the present application comprises: an induced draft fan, an annular blowing pipeline 2, and an annular isolation chamber 3; the induced draft fan is connected to the pipeline of the upper platform of the converter; the annular blowing pipeline 2 is installed below the upper platform of the converter and connected to the annular isolation chamber 3; the annular isolation chamber 3 is installed at the converter furnace mouth and is located outside the movable smoke hood 5, the bottom of the annular isolation chamber 3 is connected to the hot blast furnace exhaust gas isolation layer 4, and a high-pressure gas seal 6 is installed;

[0044] The induced draft fan is used to extract the treated flue gas that meets the standards. The flue gas that meets the standards is transported to the upper platform of the converter through the pipeline and valve connected to the induced draft fan to be reused at the converter furnace mouth;

[0045] The annular injection pipeline 2 is used to provide qualified flue gas to the annular isolation chamber;

[0046] The annular isolation chamber 3 is used to utilize the qualified flue gas to form an inert gas isolation zone at the converter furnace mouth, thereby preventing inert gases such as industrial waste gas from being quickly taken away by the suction port of the converter secondary dust removal system.

[0047] The treated flue gas that meets the standards includes waste flue gas from industrial heating furnaces or hot blast furnaces, which meets national emission standards, has an oxygen content of less than 5%, and is connected to the converter furnace mouth through an induced draft fan, pipelines, and valves for reuse.

[0048] Furthermore, the diameter of the annular blowing pipeline is set to 300-600 mm according to the output of the converter.

[0049] The present application also provides a converter high temperature flue gas coking dust removal ash blowing device, such as Figure 2 As shown, it includes a number of special blowing guns 7 for converters, an automatic adjustment control module for converter smelting, a front-of-furnace blowing distribution module 8, and a dust removal ash blowing tank 10; the special blowing guns for converters are installed on the vaporization flue 1 of the converter, and are connected to the front-of-furnace blowing distribution module 8 through a blowing pipeline; the front-of-furnace blowing distribution module is installed at the rear end of the blowing pipeline, and is connected to the dust removal ash blowing tank 10 through a pneumatic conveying pipeline 9.

[0050] In one embodiment, the converter-specific blowing gun is the core equipment of the high-temperature flue gas dust ash blowing technology, which is installed on the vaporization flue 1 of the converter and is used for dust ash blowing to fully mix the carbon-containing dust ash with the converter high-temperature flue gas to react and generate CO. The converter-specific blowing gun can withstand 1400 degrees.

[0051] In one embodiment, the converter-specific blowing gun adopts a special converter dust ash blowing gun. The process design and the gun layout are designed according to the size of the vaporization flue and the position of the on-site platform. The gun is mainly designed to be installed in the smoke hood and the first and second stages. The powder spraying amount and the gun design position are completed through computer flue gas flow field simulation, which overcomes the defects of early equipment and has been technically upgraded. It not only ensures the economic benefits of dust ash blowing, but also solves the problems affecting the stable operation of the equipment.

[0052] Due to the limitation of working environment, converter spray gun must meet the requirements of flexible control, high temperature resistance, uniform mixing, short spray distance, etc. In order to solve the problem of short nozzle life in related technologies, in one embodiment, the converter dedicated spray gun includes a nozzle, an inner tube (spray tube) and an outer tube (cooling tube) which are mutually connected. Among them, the inner tube is a two-phase material channel for dust removal ash and inert or protective gas, and the outer tube is an inert or protective gas channel, and the two form a sleeve-type spray gun.

[0053] Preferably, the cooling pipe and the blowing pipe are eccentrically arranged up and down, which can prevent the cooling airflow from wrapping the dust in the middle after the dust is sprayed out, thereby affecting the dispersion of the dust.

[0054] Preferably, the nozzle of the converter-specific blowing gun adopts an analog design and a fan-shaped output to ensure that the carbon-containing dust is fully mixed with the flue gas, while reducing the injection speed and injection distance to avoid the accumulation of carbon powder in the vaporization flue and affecting the heat exchange efficiency.

[0055] Furthermore, the nozzle is located between the inner tube and the outer tube, and is a Laval structure. The inert or protective gas is discharged through the Laval nozzle between the inner tube and the outer tube to form a supersonic jet, and the pressure in the induced nozzle area is lower than both the surrounding gas pressure and the core dust removal gas pressure. The obtained pressure difference enables the gas-solid phase material entering the low-pressure area to instantly mix with the external gas, completing the rapid mixing of dust removal ash and flue gas.

[0056] In one embodiment, the automatic adjustment control module of the converter smelting is used to control the dust removal ash injection amount and injection timing of the converter-specific injection gun.

[0057] In one embodiment, the automatic adjustment control module of the converter smelting is used to adjust the converter high temperature flue gas temperature curve according to the smelting time, the converter high temperature flue gas temperature curve ... 2 Content curve, converter high temperature flue gas CO content curve, converter high temperature flue gas CO 2 The content curve is designed to automatically control the dust ash injection of the converter special injection gun, and the dust ash injection amount and injection timing are customized according to actual conditions.

[0058] In a specific embodiment, the temperature of the converter flue gas after entering the vaporization flue is about 1200-1600°C. The main components of the converter gas are generally (volume fractions): CO is 45-65%, H2<2%, CO 2 15~25%, 0 2 The carbon content is 0.4-0.8%, and the nitrogen content is 24-38%. A dust removal ash blowing system is installed at the inlet section of the converter vaporization flue to allow the carbon-containing dust removal ash to be fully mixed with the converter high-temperature flue gas, forming a high-temperature (1400℃) + reducing atmosphere in the vaporization flue, so that the C in the dust removal ash and CO 2 The reaction generates CO, and the reaction equation is as follows:

[0059] 2C+O 2 (g)=2CO(g)→Δ r G 1

[0060] C+CO 2 (g)=2CO(g)→Δ r G 2

[0061] C(s)+O 2 =CO 2 →Δ r G 3

[0062] 2CO+O 2 =2CO 2 →Δ r G 4

[0063] Among them, Δ r G 1 ~Δ r G 4 represents the Gibbs free energy change of the four reactions in the system. Figure 3 As shown, 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 and forward.

[0064] Due to Δ r G 2 <Δ r G 3 <Δ r G 4 <Δ r G 1 Theoretically, the carbon in the carbon-containing dust and the oxygen in the flue gas 2 The reaction has the greatest tendency to generate CO. Therefore, carbon-containing dust is sprayed into the converter vaporization flue to make C react with O in the flue gas under the high temperature condition of the vaporization flue. 2It is thermodynamically feasible to react with CO2 to generate CO, thereby increasing the amount and quality of coal gas recovery.

[0065] In one embodiment, the pre-furnace blowing distribution module is used to provide dust removal ash powder to the converter-specific blowing gun to ensure that the dust removal ash blowing amount of each converter-specific blowing gun is the same.

[0066] At present, the commonly used distributors are disc type and bottle type. The distributor is generally placed on the converter platform. In order to prevent flashback and burn the gun, a certain positive pressure must be guaranteed in the distributor. The main pipe resistance should not be too large and should not be blocked. Therefore, the gas-solid transported by the main pipe is relatively small and the flow rate is high, making it difficult to achieve dense phase transport, resulting in serious wear of the main pipe.

[0067] Therefore, in one embodiment, the pre-furnace blowing distribution module adopts a special distributor device for the converter, and a distribution chamber is fixedly connected to the bottom of the connecting pipe. The distribution chamber is a conical structure with a ring-shaped cross-section. A power structure chamber is arranged inside the ring-shaped cross-section of the distribution chamber. When the gas-powder mixture moves along the path of the connecting pipe, the distribution chamber and the distribution pipe, power is provided to the dust particles through the piston rod, the cylinder body and the piston body, so that the dust particles can continue to float in the gas-powder mixture, preventing their accumulation, improving the use effect and ensuring even distribution.

[0068] In one embodiment, the upper part of the dust removal ash blowing tank is provided with upper and lower pneumatic bell valves, and the first discharge port below is provided with a continuously adjustable feeder 11; the dust removal ash blowing tank is provided with a blowing station storage bin and a blowing tank internal pressure equalizing device; the lower part of the blowing station storage bin is connected to the furnace front blowing distribution module through a pneumatic conveying pipeline;

[0069] The continuously adjustable feeder is used to input carbon-containing dust into the dust spraying tank and control the powder feeding amount;

[0070] The storage bin of the blowing station is used to store carbon-containing dust;

[0071] The internal pressure equalizing device of the spray tank is used to ensure the internal pressure of the dust removal ash spray tank is balanced;

[0072] The high-pressure nitrogen inlet is connected to the air inlet of the dust ash blowing tank through the first nitrogen pipeline. The first nitrogen pipeline is also provided with a fluidizing device for introducing high-pressure nitrogen and fluidized nitrogen into the dust ash blowing tank, and using high-pressure nitrogen to make the carbon-containing dust ash in the dust ash blowing tank enter the pneumatic conveying pipeline; the high-pressure nitrogen inlet is provided with a blowing valve;

[0073] The high-pressure nitrogen inlet is connected to the pneumatic conveying pipeline through the second nitrogen pipeline; the second discharge port of the dust removal ash blowing tank is merged with the second nitrogen pipeline through the outlet pipeline, and connected to the pneumatic conveying pipeline together. The second nitrogen pipeline is used to provide a small amount of conveying gas as a carrier, and the carbon-containing dust removal ash output from the second discharge port is transported along the pneumatic conveying pipeline to the front-furnace blowing distribution module to realize dense phase transportation and reduce wear on the pipeline; a regulating valve is also provided on the outlet pipeline.

[0074] In one embodiment, the carbon-containing dust ash is coking dust ash and carbon-containing solid waste. Among them, the coking dust ash is obtained by collecting the dust-containing flue gas generated in the coking production process through a bag dust collector; the carbon-containing solid waste is also a kind of dust ash from the material yard and sintering feeding system.

[0075] The carbon-containing dust ash is collected by a dust collector and stored in a dust ash storage bin. A pneumatic conveying system is installed at the bottom of the dust ash storage bin to transport the carbon-containing dust ash to the converter smelting workshop. This allows solid waste to be reused and generates extremely high economic value.

[0076] In one embodiment, the continuously adjustable feeder includes a rotary powder feeder, a drive motor, and a frequency converter cabinet connected in sequence; the frequency converter cabinet adjusts the rotation of the rotary powder feeder by controlling the drive motor to adjust the powder feeding amount of the carbon-containing dust ash to meet production requirements.

[0077] Furthermore, the control parameters of the frequency converter cabinet are calculated by the automatic adjustment control module of the converter smelting according to the required powder feeding amount of the carbon-containing dust removal ash.

[0078] In one embodiment, a fluidizing gas volume regulating valve is provided in front of the fluidizing device, and a gas supply regulating valve is provided on the pneumatic conveying pipeline. The opening and closing of each pneumatic valve is completed by its control system. The spray tank is weighed by an electronic scale, which can accurately measure the weight of the dust removal ash in the tank. The automatic adjustment control module can match the converter smelting and control the dust removal ash spraying volume according to the dust removal ash C content.

[0079] At present, most of the spray tanks adopt upper pressure charging, and the particle size of the dust ash to be sprayed is very fine, so the air permeability will decrease with the increase of the thickness of the loading layer. When the spray tank is opened for pressure charging, a high-pressure area will be generated on the upper part of the ash powder spray tank, causing the dust ash at the bottom to be compacted, causing the dust ash to lose its original naturally stacked fluffy state, making it difficult to discharge the material from the spray tank.

[0080] Therefore, in one embodiment, the internal pressure equalizing device of the spray tank is installed in the tube body of the spray tank, and is composed of a control valve, a sealing flange, and a pressure equalizing air pipe. It can quickly and evenly transport high-pressure gas to any position in the spray tank, and can ensure that the internal pressure of the spray tank is balanced, is not affected by the amount of loading, and does not cause vertical extrusion and compaction of the carbon powder, which is conducive to the uniform spraying of dust removal powder.

[0081] The present application also provides a high-value full recovery system for converter gas, comprising the above-mentioned converter furnace mouth inert gas isolation device and converter high-temperature flue gas coking dust removal ash blowing device; wherein, the converter high-temperature flue gas coking dust removal ash blowing device is connected to the converter smelting workshop, and the converter furnace mouth inert gas isolation device is installed in the converter furnace body protective wall of the converter platform.

[0082] The converter mouth inert gas isolation device is used to establish isolation measures at the converter mouth, minimize the contact between flue gas and air during converter oxygen blowing smelting, reduce CO combustion, increase the calorific value of gas recovery, and also isolate air from entering the converter vaporization flue, shorten the release time, so that the converter gas meets the gas recovery conditions from the beginning of blowing, and can greatly increase the gas recovery volume.

[0083] The converter high-temperature flue gas coking dust ash injection device is used to inject carbon-containing dust ash into the converter high-temperature flue gas. The carbon-containing dust ash uses coking dust ash and carbon-containing solid waste, which can quickly consume O in the converter flue gas (high temperature of 1400°C) and in a reducing environment. 2 and the carbon-containing dust is quickly mixed with the flue gas, so that the carbon in the carbon-containing dust is mixed with the CO in the flue gas. 2 Reduction reaction (C+CO 2 =2CO), generating CO, which can significantly increase the CO content of coal gas and improve the calorific value of coal gas. At the same time, it can also be linked with converter smelting, and according to the smelting conditions and the carbon content of dust ash solid waste, the injection process can be adjusted in time, and the appropriate amount of coking dust ash can be injected into the converter high-temperature flue gas to complete the automatic adjustment and automatic control of the injection.

[0084] The converter high-temperature flue gas coking dust injection device is also used to transport nitrogen to the converter, so that the converter mouth inert gas isolation device can utilize nitrogen, heating furnace waste flue gas or hot blast furnace industrial waste gas to increase air isolation measures at the converter mouth and reduce the combustion of CO during converter oxygen blowing smelting.

[0085] In summary, the converter gas high-value full recovery system first uses the converter mouth inert gas isolation device to reduce gas combustion; then uses the converter high-temperature flue gas coking dust ash injection device to increase the gas calorific value by injecting coking dust ash into the converter, while using industrial solid waste to generate extremely high economic value. The system makes comprehensive use of the above two devices, which can greatly improve the converter gas utilization rate and reduce CO and CO2 emission.

[0086] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A converter furnace mouth inert gas isolation device, characterized in that: The device comprises: an induced draft fan, an annular blowing pipeline, and an annular isolation chamber; the induced draft fan is connected to the pipeline of the upper platform of the converter; the annular blowing pipeline is installed below the upper platform of the converter and connected to the annular isolation chamber; the annular isolation chamber is installed at the converter furnace mouth and located outside the movable smoke hood, the bottom of the annular isolation chamber is connected to the hot blast furnace exhaust gas isolation layer, and a high-pressure gas seal is installed; The induced draft fan is used to extract the treated flue gas that meets the standards. The flue gas that meets the standards is transported to the upper platform of the converter through the pipeline and valve connected to the induced draft fan to be reused at the converter furnace mouth; The annular injection pipeline is used to provide qualified flue gas to the annular isolation chamber; The annular isolation chamber is used to form an inert gas isolation zone at the converter furnace mouth using the qualified flue gas.

2. A converter high temperature flue gas coking dust removal ash blowing device, characterized in that: The device comprises a plurality of converter-specific blowing guns, an automatic adjustment control module for converter smelting, a furnace-front blowing distribution module, and a dust removal ash blowing tank; the converter-specific blowing gun is installed on the vaporization flue of the converter and is connected to the furnace-front blowing distribution module through a blowing pipeline; the furnace-front blowing distribution module is installed at the rear end of the blowing pipeline and is connected to the dust removal ash blowing tank through a pneumatic conveying pipeline; The converter-specific blowing gun is used to blow dust, so that the carbon-containing dust is fully mixed with the converter high-temperature flue gas to react and generate CO; The automatic adjustment control module of the converter smelting is used to control the dust removal ash injection amount and injection timing of the converter special injection gun; The pre-furnace blowing distribution module is used to provide dust removal ash powder to the converter-specific blowing gun, ensuring that the dust removal ash blowing amount of each converter-specific blowing gun is the same.

3. The converter high temperature flue gas coking dust removal ash injection device according to claim 2 is characterized in that: The converter-specific blowing gun includes an inner tube and an outer tube which are connected to each other; the inner tube is a two-phase material channel for dust removal ash and inert or protective gas, and the outer tube is an inert or protective gas channel; the inert or protective gas is discharged through a Laval nozzle between the inner tube and the outer tube to form a supersonic jet, inducing the pressure in the nozzle area to be lower than both the surrounding gas pressure and the core dust removal ash gas pressure, and the resulting pressure difference allows the gas-solid phase material entering the low-pressure area to instantly achieve rapid mixing with the external gas, thereby completing rapid mixing of the dust removal ash and flue gas.

4. The converter high temperature flue gas coking dust removal ash injection device according to claim 3 is characterized in that: The inner tube and the outer tube are eccentrically arranged up and down.

5. The converter high temperature flue gas coking dust removal ash injection device according to claim 2 is characterized in that: The nozzle of the converter-specific blowing gun adopts an analog design and adopts a fan-shaped output.

6. The converter high temperature flue gas coking dust removal ash injection device according to claim 2 is characterized in that: The automatic adjustment control module for converter smelting is used to automatically control the dust ash spraying of the converter-specific blowing gun according to the smelting time, the converter high-temperature flue gas temperature curve, the converter high-temperature flue gas O2 content curve, the converter high-temperature flue gas CO content curve, and the converter high-temperature flue gas CO2 content curve, and customize the dust ash spraying amount and spraying timing according to actual conditions.

7. The converter high temperature flue gas coking dust removal ash injection device according to claim 2 is characterized in that: The pre-furnace blowing distribution module adopts a special distributor device for the converter, and a distribution chamber is fixedly connected to the bottom of the connecting pipe. The distribution chamber is a conical structure with a ring-shaped cross-section. A power structure chamber is arranged inside the ring-shaped cross-section of the distribution chamber. When the gas-powder mixture moves along the path of the connecting pipe, the distribution chamber and the distribution pipe, power is provided to the carbon-containing dust removal ash through the piston rod, the cylinder body and the piston body, so that the carbon-containing dust removal ash remains floating in the gas-powder mixture.

8. The converter high temperature flue gas coking dust removal ash injection device according to claim 2 is characterized in that: The upper part of the dust removal ash spraying tank is provided with upper and lower pneumatic bell valves, and the first discharge port below is provided with a continuously adjustable feeder; the dust removal ash spraying tank is provided with a spraying station storage bin and a spraying tank internal pressure equalizing device; the lower part of the spraying station storage bin is connected to the furnace front spray distribution module through a pneumatic conveying pipeline; The continuously adjustable feeder is used to input carbon-containing dust into the dust spraying tank and control the powder feeding amount; The storage bin of the blowing station is used to store carbon-containing dust; The internal pressure equalizing device of the spray tank is used to ensure the internal pressure of the dust removal ash spray tank is balanced; The high-pressure nitrogen inlet is connected to the air inlet of the dust ash spraying tank through the first nitrogen pipeline. The first nitrogen pipeline is also provided with a fluidizing device for introducing high-pressure nitrogen and fluidized nitrogen into the dust ash spraying tank, and using the high-pressure nitrogen to make the carbon-containing dust ash in the dust ash spraying tank enter the pneumatic conveying pipeline; The high-pressure nitrogen inlet is connected to the pneumatic conveying pipeline through the second nitrogen pipeline; the second discharge port of the dust removal ash blowing tank is merged with the second nitrogen pipeline through the discharge pipeline and connected to the pneumatic conveying pipeline together, and the second nitrogen pipeline is used to provide a small amount of conveying gas as a carrier to transport the carbon-containing dust removal ash output from the second discharge port along the pneumatic conveying pipeline to the front-of-furnace blowing distribution module.

9. The converter high temperature flue gas coking dust removal ash injection device according to claim 8, characterized in that: The continuously adjustable feeder comprises a rotary powder feeder, a drive motor, and a frequency converter cabinet which are connected in sequence; the frequency converter cabinet adjusts the rotation of the rotary powder feeder by controlling the drive motor to adjust the powder feeding amount of the carbon-containing dust ash.

10. The converter high temperature flue gas coking dust removal ash injection device according to claim 9, characterized in that: The control parameters of the frequency converter cabinet are calculated by the automatic adjustment control module of the converter smelting according to the required powder feeding amount of carbon-containing dust removal ash.

11. A converter gas high-value full recovery system, characterized in that: The system includes the converter mouth inert gas isolation device as described in claim 1, and the converter high-temperature flue gas coking dust removal ash blowing device as described in any one of claims 2-10; the converter high-temperature flue gas coking dust removal ash blowing device is connected to the converter smelting workshop, and the converter mouth inert gas isolation device is installed in the converter platform converter furnace body protective wall.

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