Converter flue gas treatment system

Abstract

The invention relates to the technical field of steel smelting, and discloses a converter flue gas treatment system. Comprising a converter used for generating flue gas at a second preset temperature at a first preset temperature; the evaporative cooling assembly is arranged above the converter and is used for exchanging heat with the flue gas through cooling water; the resource receiving assembly is connected with the evaporative cooling assembly and comprises a carbon-containing powder conveying device and a device for spraying carbon dioxide-rich flue gas generated by coal gas combustion, and the carbon-containing powder conveying device is used for inputting carbon-containing powder to the evaporative cooling assembly; the jetting device for the carbon dioxide-rich flue gas generated by gas combustion is used for inputting the flue gas generated by gas combustion between the converter and the evaporative cooling assembly to form an anaerobic gas curtain; and generating carbon monoxide from the carbon-containing powder and the flue gas generated after the coal gas is combusted under the action of the second preset temperature. The system can receive and introduce available resources such as carbon-containing powder and flue gas generated after gas combustion, reduces the burning loss of converter gas, reduces the process energy consumption, and realizes resource reutilization.

Description

Technical Field

[0001] The invention relates to the technical field of steel smelting, and in particular to a converter flue gas treatment system. Background Art

[0002] With the rapid development of global industrialization, the steel industry, as an important pillar of the national economy, has become increasingly prominent in terms of energy consumption and environmental pollution. The high-temperature flue gas generated in the steelmaking process contains abundant high-grade thermal energy resources. However, in the traditional steelmaking process, the thermal energy of these high-temperature flue gases is often not fully and effectively recovered and utilized, resulting in a large amount of energy waste and environmental pollution. At the same time, with the improvement of environmental protection requirements, especially the promotion of ultra-low emission policies for steel, in order to meet the standards of the furnace environment, the steelmaking process has increased the exhaust flow of the primary dust removal fan, resulting in a large amount of air entering the smoke hood, thereby increasing the burning loss of carbon monoxide in the converter gas, and reducing the calorific value of the gas, wasting energy. Therefore, how to efficiently recover the gas and high-grade thermal energy generated in the steelmaking process, realize the recycling of energy and resources, and reduce energy consumption and environmental pollution has become an important technical problem that needs to be solved in the current steel industry.

[0003] At present, in response to the high-temperature flue gas generated in the converter steelmaking process, a series of waste heat recovery technologies are generally adopted in the industry to improve energy utilization efficiency. Among them, the vaporization flue technology is a more common one. This technology installs a heat exchange device in the flue, uses the high-temperature flue gas to heat the working medium (such as water), generates steam, and then converts the sensible heat of the thermal flue gas into usable steam energy. Specifically, the vaporization flue can recover part of the heat of the high-temperature flue gas and produce saturated steam of a certain pressure and temperature. This steam can be used for power generation, heating or other industrial purposes, realizing partial recovery of energy. This waste heat recovery technology is a conversion project from high-grade thermal energy to low-grade thermal energy.

[0004] However, in the steel smelting process, in addition to the sensible heat of high-temperature flue gas, there are also a large number of available resources, which are often ignored in waste heat recovery technology, resulting in resource waste. Summary of the invention

[0005] In view of this, the present invention provides a converter flue gas treatment system to solve the problem that in addition to the sensible heat of high-temperature flue gas in the steel smelting process, there are a large number of available resources, which are often ignored in waste heat recovery technology, resulting in resource waste.

[0006] The present invention provides a converter flue gas treatment system, comprising: a converter, used to generate flue gas of a second preset temperature at a first preset temperature; wherein the first preset temperature is greater than the second preset temperature; a vaporization cooling component, arranged above the converter, used to exchange heat with the flue gas through cooling water; a resource receiving component, connected to the vaporization cooling component, comprising a carbon-containing powder transmission device and a carbon dioxide-rich flue gas injection device generated by coal gas combustion, wherein the carbon-containing powder transmission device is used to input carbon-containing powder into the vaporization cooling component, and the carbon dioxide-rich flue gas injection device generated by coal gas combustion is used to input carbon dioxide-rich flue gas generated by coal gas combustion between the converter and the vaporization cooling component to form an inactive oxygen-free curtain; wherein the carbon-containing powder and the carbon dioxide-rich flue gas generated by coal gas combustion generate carbon monoxide under the action of the second preset temperature.

[0007] The converter flue gas treatment system provided in this embodiment can receive and introduce available resources such as carbon-containing powder and carbon dioxide-rich flue gas generated by combustion and utilization of steel plant coal gas through the resource receiving component. The carbon dioxide-rich flue gas generated by the combustion of coal gas is input between the converter and the vaporization cooling component to form an inactive oxygen-free curtain to isolate the outside air from contact with the high-temperature converter flue gas, reduce the combustion of CO in the converter flue gas and oxygen in the air, thereby increasing the recovery of CO and the calorific value of the converter gas; in the high-temperature environment of the converter, the carbon in the carbon-containing powder reacts chemically with the CO2 in the flue gas to generate CO, and the simple heat recovery is converted into the utilization of chemical energy through chemical reaction, thereby realizing the efficient utilization of resources and energy. At the same time, this chemical reaction process is an endothermic reaction, which further reduces the flue gas temperature at the furnace mouth and increases the service life of the equipment.

[0008] In an optional embodiment, the vaporization cooling component includes: a vaporization hood, which is arranged above the converter and has a gap reserved between it and the converter; a vaporization cooling flue, which is connected to the vaporization hood and is used to exchange heat with the flue gas through cooling water to reduce the flue gas temperature, recover the converter gas and recover heat energy.

[0009] In an optional embodiment, a carbon-containing powder transmission device is connected to the vaporization cooling flue, for receiving the carbon-containing powder and spraying the carbon-containing powder into the vaporization cooling flue; a carbon dioxide-rich flue gas injection device generated by the combustion of coal gas is arranged on the inner wall of the vaporization hood and close to the upper end of the furnace wall of the converter, forming an annular nozzle, for forming an inactive oxygen-free curtain in the gap between the converter furnace mouth and the vaporization hood, so as to isolate the outside air from entering the converter gas and prevent the converter gas from overflowing.

[0010] During daily work, only the carbon dioxide-rich flue gas nozzle generated by coal gas combustion is opened. The function of this nozzle is to spray CO2 to form a large inertia inert compensation oxygen-free curtain between the converter furnace mouth and the vaporization smoke hood, which plays the role of oxygen-free and providing CO2 carbon source.

[0011] In an optional embodiment, the carbon-containing powder transmission device includes: a carbon-containing powder containing device, a pneumatic conveying device and a carbon-containing powder injection device; the carbon-containing powder containing device is used to receive processed carbon-containing powder and add carbon-containing powder into the carbon-containing powder injection device; the carbon-containing powder injection device is respectively connected to the vaporization cooling flue and the carbon-containing powder containing device, and is used to receive carbon-containing powder and inject the carbon-containing powder into the vaporization cooling flue under the action of the carrier gas in the pneumatic conveying device.

[0012] In the converter flue gas treatment system provided in this embodiment, the carbonaceous powder material receiving device can stably receive and store carbonaceous powder materials, etc., to ensure that these raw materials will not leak or be contaminated during use. Under the action of the carrier gas, the carbonaceous powder materials can be sprayed into the vaporization cooling flue at a high speed and in a uniform manner. The carrier gas will not react with other gases and is conducive to the stable transportation of the powder materials.

[0013] In an optional embodiment, it also includes: an inactive gas injection device; the inactive gas injection device is arranged on the lower side of the vaporization hood away from the vaporization cooling flue relative to the carbon dioxide-rich flue gas injection device generated by the combustion of coal gas, and is used to form an annular injection gas curtain at the gap between the vaporization hood and the converter to prevent oxygen-containing air from entering the converter flue gas treatment system.

[0014] In the converter flue gas treatment system provided in this embodiment, the inactive gas injection device is arranged at the lower side of the vaporization hood away from the vaporization cooling flue relative to the carbon dioxide-rich flue gas injection device generated by the combustion of coal gas. Its main function is to inject gas into the gap formed between the vaporization hood and the converter when the carbon dioxide-rich flue gas injection device is under maintenance or fails, forming a gas curtain screen to effectively prevent external oxygen from entering the converter flue gas. This is conducive to maintaining the normal operation of the system, reducing the burnout of CO in the converter gas, and increasing the quality of the converter gas recovery.

[0015] In an optional embodiment, the inert gas is nitrogen or an inert gas.

[0016] Nitrogen or inert gas has stable chemical properties and will not react chemically with other media, ensuring the normal treatment of flue gas and the normal operation of the system.

[0017] In an optional embodiment, the inactive gas injection device is an annular nozzle arranged at the outer edge of the inner wall of the vaporization fume hood close to the furnace wall of the converter.

[0018] In an optional embodiment, it also includes: a carbon-containing powder transporting device, a conveying fan and a flue; the carbon-containing powder transporting device is used to transport the carbon-containing powder and transfer the carbon-containing powder to the carbon-containing powder containing device; the conveying fan is used to transfer the flue gas generated after the combustion of the steel plant gas through the flue to the carbon dioxide-rich flue gas injection device generated by the combustion of the gas.

[0019] The converter flue gas treatment system provided in this embodiment includes a conveying device for carbon-containing powders such as blast furnace dust, a conveying fan and a flue. These carbon-containing powders are solid wastes containing iron, zinc and carbon in the steel smelting process, and are also resources. They are output through the blast furnace dust removal system, and can also be coal powder injected into the blast furnace, ensuring a stable supply of raw materials. The flue gas (mainly carbon dioxide and nitrogen) generated after the combustion and utilization of steel plant gas is connected to the converter flue gas injection device through the flue device, realizing the transportation and supply of flue gas, and has the advantage of overall stable operation.

[0020] In an optional embodiment, the carbon-containing powder is at least one of carbon-containing solid waste, blast furnace dust ash or pulverized coal injected into a blast furnace.

[0021] In an optional embodiment, it also includes: an oxygen lance; the oxygen lance is connected to the converter and is used to input oxygen into the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a structural schematic diagram of a converter flue gas treatment system according to an embodiment of the present invention;

[0024] Figure 2 is a structural schematic diagram of another converter flue gas treatment system according to an embodiment of the present invention;

[0025] Figure 3 is a structural schematic diagram of another converter flue gas treatment system according to an embodiment of the present invention;

[0026] Figure 4 is a structural schematic diagram of another converter flue gas treatment system according to an embodiment of the present invention;

[0027] Figure 5 is a structural schematic diagram of another converter flue gas treatment system according to an embodiment of the present invention;

[0028] Figure 6is a structural schematic diagram of another converter flue gas treatment system according to an embodiment of the present invention;

[0029] Explanation of the reference numerals: 100, converter; 200, resource receiving assembly; 2001, carbonaceous powder conveying device; 20010, carbonaceous powder containing device; 20011, carbonaceous powder injection device; 2002, carbon dioxide-rich flue gas injection device generated by coal gas combustion; 300, vaporization cooling assembly; 3001, vaporization cooling flue; 3002, vaporization hood; 400, inactive gas injection device; 500, oxygen gun. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] Based on relevant technologies, it can be seen that with the rapid development of global industrialization, the steel industry, as an important pillar of the national economy, has become increasingly prominent in terms of energy consumption and environmental pollution. The high-temperature flue gas generated during the steelmaking process contains abundant thermal energy resources. However, in traditional steelmaking processes, the thermal energy of these high-temperature flue gases is often not fully and effectively recovered and utilized, resulting in a large amount of energy waste and environmental pollution. Therefore, how to efficiently recover the thermal energy of the high-temperature flue gas generated during the steelmaking process, realize the recycling of energy and resources, and reduce energy consumption and environmental pollution has become an important technical issue that needs to be urgently solved in the current steel industry.

[0032] At present, in response to the high-temperature flue gas generated in the converter steelmaking process, a series of waste heat recovery technologies are generally adopted in the industry to improve energy utilization efficiency. Among them, the vaporization flue technology is a more common one. This technology installs a heat exchange device in the flue, uses the high-temperature flue gas to heat the working medium (such as water), generates steam, and then converts the thermal energy into usable steam energy. Specifically, the vaporization flue can recover part of the heat of the high-temperature flue gas and produce saturated steam of a certain pressure and temperature. This steam can be used for power generation, heating or other industrial purposes, realizing partial recovery of energy.

[0033] However, in the steel smelting process, in addition to high-temperature flue gas, there are also a large number of available resources, which are often ignored in waste heat recovery technology, resulting in resource waste.

[0034] Based on this, the present invention provides a converter flue gas treatment system, which can receive and introduce carbon-containing powder and carbon dioxide-rich flue gas generated after the combustion of coal gas, which are available resources, through a resource receiving component. In the high temperature environment of the converter, the carbon-containing powder and the carbon dioxide-rich flue gas generated after the combustion of coal gas react chemically to generate carbon monoxide, thereby realizing resource recycling. At the same time, this chemical reaction process further improves the release and utilization efficiency of heat. In addition, the vaporization cooling component arranged above the converter realizes sufficient heat exchange between the high-temperature flue gas and the cooling water, thereby significantly reducing the flue gas temperature and recovering high-quality heat energy. This heat energy recovery method not only improves the energy utilization efficiency, but also reduces thermal pollution to the environment.

[0035] Figure 1 is a schematic diagram of the structure of a converter flue gas treatment system according to an embodiment of the present invention, Figure 1 As shown, the converter flue gas treatment system includes: a converter 100, a vaporization cooling component 300 and a resource receiving component 200; the converter 100 is used to generate flue gas of a second preset temperature at a first preset temperature; wherein the first preset temperature is greater than the second preset temperature; the vaporization cooling component 300 is arranged above the converter 100, and is used to exchange heat with the flue gas through cooling water; the resource receiving component 200 is connected to the vaporization cooling component 300, and includes a carbon-containing powder transmission device 2001 and a carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion, the carbon-containing powder transmission device 2001 is used to input carbon-containing powder into the vaporization cooling component 300, and the carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion is used to input carbon dioxide-rich flue gas generated by coal gas combustion between the converter 100 and the vaporization cooling component 300, forming an inactive oxygen-free curtain; wherein the carbon-containing powder and the carbon dioxide-rich flue gas generated by coal gas combustion generate carbon monoxide under the action of the second preset temperature.

[0036] The converter 100 refers to a metallurgical device used for steelmaking, which removes impurities and refines liquid steel by blowing in oxygen to react with molten pig iron for oxidation. The vaporization cooling component 300 refers to a device that uses cooling water to exchange heat with high-temperature flue gas, which is used to reduce the flue gas temperature and recover heat energy. It is usually arranged above the converter 100 and connected to the cooling water circulation system through a pipeline system. The resource receiving component 200 refers to a device for receiving and distributing various resources, which is responsible for inputting carbon-containing powder into the vaporization cooling component 300 and inputting carbon dioxide-rich flue gas generated by coal gas combustion into the converter 100. It serves as a bridge connecting different process links and equipment.

[0037] The first preset temperature may be a high temperature condition required for the oxidation reaction in the converter 100, which is usually much higher than the room temperature and the temperature of other process links. The second preset temperature is the temperature reached by the steelmaking flue gas after a certain treatment, which is lower than the first preset temperature. The carbon dioxide-rich flue gas generated by the combustion of the carbon-containing powder and the coal gas generates carbon monoxide and the like under the action of the second preset temperature. Among them, the first preset temperature may be 2650°C or other temperatures, which are not specifically limited here, and the second preset temperature may be 1600°C or other temperatures, which are not specifically limited here.

[0038] Specifically, first, high-temperature liquid pig iron and a certain amount of scrap steel and quicklime can be injected into the converter 100. Subsequently, oxygen is blown in through the oxygen lance of the converter 100, and a violent oxidation reaction occurs with the molten pig iron. During the oxidation process, elements such as silicon and manganese are first oxidized to form slag, and then the carbon element begins to oxidize, generating carbon monoxide and releasing a large amount of heat, causing the molten steel to boil violently. At the same time, the phosphorus element will also undergo an oxidation reaction and react with the quicklime to form slag. By adjusting the oxygen blowing amount, the feeding speed of the raw materials, etc., it is ensured that a sufficient oxidation reaction is carried out at a first preset temperature (much higher than the second preset temperature). As the reaction proceeds, a large amount of steelmaking fume is generated in the furnace, and its temperature gradually decreases to the second preset temperature.

[0039] The carbon dioxide-rich flue gas generated by the combustion of coal gas is transmitted to the resource receiving component 200 through a pipeline. These flue gases contain a certain amount of heat and chemical components, which can be used for subsequent chemical reactions. The carbon-containing powder generated by the blast furnace dust removal equipment, such as blast furnace bag ash and / or carbon-containing raw materials such as coke powder, coal powder, etc., are transported to the resource receiving component 200 through a specific transmission device. The carbon-containing powder will play an important role in subsequent reactions. Among them, the specific transmission device can be a spray gun, a pipeline, or a transport vehicle, etc., which is not specifically limited here. Specifically, in the converter 100 or in a specific reaction area, the carbon-containing powder reacts with the CO2 in the carbon dioxide-rich flue gas generated by the combustion of coal gas under the action of the second preset temperature to generate carbon monoxide.

[0040] The cooling water circulates through the piping system of the vaporization cooling assembly 300. When the high-temperature steelmaking flue gas contacts the cooling water, the heat is transferred to the cooling water, causing the cooling water to gradually heat up and partially vaporize. The vaporized steam and the unvaporized water are separated in the steam drum. The steam is collected and can be used in other processes (such as power generation, heating, etc.), thereby realizing the recovery and utilization of heat energy. The unvaporized water returns to the cooling system for continued circulation.

[0041] The converter flue gas treatment system provided in this embodiment can receive and introduce available resources such as carbon-containing powder and carbon dioxide-rich flue gas generated after the combustion and utilization of coal gas through the resource receiving component 200. In the high temperature environment of the converter 100, the carbon-containing powder reacts chemically with the carbon dioxide-rich flue gas generated after the combustion and utilization of coal gas to generate carbon monoxide, and the simple heat recovery is converted into the utilization of chemical energy through chemical reaction, thereby realizing the efficient utilization of resources and energy. At the same time, this chemical reaction process further improves the release and utilization efficiency of heat. In addition, the vaporization cooling component 300 arranged above the converter 100 realizes sufficient heat exchange between high-temperature flue gas and cooling water, thereby significantly reducing the flue gas temperature and recovering high-quality heat energy. This heat energy recovery method not only improves the energy utilization efficiency, but also reduces thermal pollution to the environment.

[0042] Figure 2 FIG. 1 is a schematic diagram of the structure of another converter flue gas treatment system according to an embodiment of the present invention. Figure 2 As shown, the vaporization cooling assembly 300 includes: a vaporization cooling flue 3001 and a vaporization hood 3002; the vaporization cooling flue 3001 is connected to the vaporization hood 3002, and is used to exchange heat with the flue gas through cooling water to reduce the flue gas temperature, recover the converter gas and recover heat energy; the vaporization hood 3002 is arranged above the converter 100, and a gap is reserved between the converter 100.

[0043] The vaporization cooling flue 3001 refers to a pipe system connected to the vaporization hood 3002, and a cooling water circulation system is designed inside. The flue gas temperature is reduced by heat exchange with the high-temperature steelmaking flue gas, and heat energy is recovered. The flue may contain multiple cooling sections.

[0044] The vaporization hood 3002 is a device disposed above the steelmaking converter 100, and its main function is to collect high-temperature steelmaking flue gas, and to exchange heat with the high-temperature steelmaking flue gas to reduce the flue gas temperature and recover heat energy. The vaporization hood 3002 may be a truncated cone-shaped cavity, the bottom inner diameter of the cavity is larger than the outer diameter of the converter 100, and the converter 100 is disposed below the truncated cone-shaped cavity and can rotate.

[0045] Heat recovery refers to a technical means of reducing energy consumption and costs by collecting and utilizing waste heat generated during the steelmaking process. In the evaporative cooling assembly 300, heat energy can be reused by recovering the heat energy of the flue gas and converting it into energy in the form of steam.

[0046] Specifically, the vaporization hood 3002 is installed above the converter 100. Its main function is to collect steelmaking flue gas and act as a barrier to prevent external oxygen from entering the converter 100 to ensure the normal chemical reaction in the converter. A certain gap is left between the vaporization hood 3002 and the steelmaking converter 100 to ensure that the converter 100 and the vaporization hood 3002 will not be squeezed or damaged by each other during thermal expansion. The vaporization cooling flue 3001 is connected to the top of the vaporization hood 3002 to receive the high-temperature steelmaking flue gas discharged from the converter 100. A cooling water circulation system can be designed inside the flue to exchange temperature with the flue gas.

[0047] In the converter flue gas treatment system provided in this embodiment, the vaporization cooling flue 3001 performs heat exchange with high-temperature steelmaking flue gas through cooling water, which can significantly reduce the temperature of the flue gas and recover a large amount of heat energy, which not only improves the energy utilization efficiency but also reduces the thermal pollution to the environment. The vaporization hood 3002 is arranged above the converter, and its main function is to recover the converter gas and prevent external oxygen from entering the converter. It is very important to maintain the reducing atmosphere in the converter, ensuring the smooth progress of the steelmaking process and the stability of the molten steel quality.

[0048] Figure 3 FIG. 1 is a schematic diagram of the structure of another converter flue gas treatment system according to an embodiment of the present invention. Figure 3 As shown, the resource receiving component 200 includes: a carbon-containing powder transmission device 2001 and a carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion; the carbon-containing powder transmission device 2001 is connected to the vaporization cooling flue 3001, and is used to receive the carbon-containing powder and inject the carbon-containing powder into the vaporization cooling flue 3001; the carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion is arranged on the inner wall of the vaporization hood 3002 and close to the upper end of the furnace wall of the converter, forming an annular nozzle, which is used to form an inactive oxygen-free curtain in the gap between the furnace mouth of the converter 100 and the vaporization hood 3002, so as to isolate the outside air from entering the converter gas and prevent the converter gas from overflowing.

[0049] The carbonaceous powder conveying device 2001 is a device for receiving and spraying carbonaceous powder. The carbonaceous powder conveying device 2001 may include a receiving portion and a spraying portion. The main function of the device is to convey the carbonaceous powder into the vaporization cooling assembly 300 so as to react with the carbon dioxide-rich flue gas generated by the combustion of coal gas.

[0050] The carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion refers to a device for inputting flue gas into the converter 100. The carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion can be installed on the outer edge of the inner wall of the vaporization hood 3002, and the carbon dioxide-rich flue gas generated by coal gas combustion is injected to the wall of the converter 100 through the injection port to form an air curtain to isolate external oxygen from entering the converter 100.

[0051] Carbonaceous powder refers to a powdered material containing carbon, such as carbonaceous solid waste such as blast furnace ash or carbonaceous raw materials such as coke powder and coal powder. In the steelmaking process, it can be used as a reducing agent or fuel to react with carbon dioxide to generate gases such as carbon monoxide. The carbonaceous powder is injected into the vaporization cooling assembly 300 through the carbonaceous powder transmission device 2001, and can react with carbon dioxide to generate useful gases such as carbon monoxide.

[0052] Specifically, carbonaceous powder (such as blast furnace bag ash, coke powder, coal powder, etc.) is transported from an external supply source (such as blast furnace dust removal equipment) to the receiving port of the carbonaceous powder transmission device 2001, and the carbonaceous powder is transported from the receiving port of the carbonaceous powder transmission device 2001 to the injection port connected to the vaporization cooling flue 3001, and then the carbonaceous powder is injected into the vaporization cooling component 300 through the injection device. The carbon dioxide-rich flue gas generated by the combustion of coal gas can be transported from the flue device after the combustion of coal gas through the pipeline system to the receiving port of the carbon dioxide-rich flue gas injection device 2002 generated by the combustion of coal gas, and then the carbon dioxide-rich flue gas generated by the combustion of coal gas is input into the converter 100. The flue gas is rich in CO2 gas, and the flue gas can be flue gas from a power plant or other flue gas after the combustion of coal gas in addition to the flue gas from the steel rolling heating furnace.

[0053] The converter flue gas treatment system provided in this embodiment can effectively transmit carbon-containing powder and flue gas through the carbon-containing powder transmission device 2001 and the carbon dioxide-rich flue gas injection device 2002 generated by coal gas combustion, ensuring that these valuable resources are fully utilized and avoiding waste of resources.

[0054] Figure 4 is a schematic diagram of the structure of a converter flue gas treatment system according to an embodiment of the present invention. Figure 4 As shown, the carbon-containing powder transmission device 2001 includes: a carbon-containing powder containing device 20010 and a carbon-containing powder injection device 20011; the carbon-containing powder containing device 20010 is used to receive the processed carbon-containing powder and add the carbon-containing powder into the carbon-containing powder injection device 20011; the carbon-containing powder injection device 20011 is respectively connected to the vaporization cooling flue 3001 and the carbon-containing powder containing device 20010, and is used to receive the carbon-containing powder and inject the carbon-containing powder into the vaporization cooling flue 3001 under the action of the carrier gas in the pneumatic conveying device.

[0055] The carbon-containing powder holding device 20010 refers to a device or component for receiving and storing carbon-containing powder. The carbon-containing powder holding device 20010 may be a powder spraying bin, or other devices or components that can hold carbon-containing powder, which are not specifically limited here. The carbon-containing powder injection device 20011 refers to a device or component that takes the carbon-containing powder out of the holding device and injects it to the target position. The carbon-containing powder injection device 20011 may be a spray gun, etc., which are not specifically limited here.

[0056] Specifically, the carbon-containing powder can be delivered into the carbon-containing powder containing device 20010 by some means (such as mechanical conveying, manual addition, etc.), and a carrier gas, such as high-pressure nitrogen, is prepared. Of course, other inert gases can also be used as a power source for spraying the carbon-containing powder. The carbon-containing powder enters the carbon-containing powder spraying device 20011 from the containing device through a pipeline. Under the action of nitrogen, the carbon-containing powder is accelerated and sprayed into the vaporization cooling component 300.

[0057] In the converter flue gas treatment system provided in this embodiment, the carbonaceous powder material receiving device 20010 can stably receive and store carbonaceous powder materials, etc., to ensure that these raw materials will not leak or be contaminated during use. Under the action of nitrogen, the carbonaceous powder materials can be sprayed into the vaporization cooling assembly 300 in a high-speed and uniform manner. As a carrier gas, nitrogen will not react with other gases and is conducive to the stable transportation of powder materials.

[0058] Figure 5 FIG. 1 is a schematic diagram of the structure of another converter flue gas treatment system according to an embodiment of the present invention. Figure 5 As shown, the above system also includes: an inactive gas injection device 400; the inactive gas injection device 400 is arranged on the lower side of the vaporization hood 3002 away from the vaporization cooling flue relative to the carbon dioxide-rich flue gas injection device 2002 generated by the combustion of coal gas, and is used to form an annular injection gas curtain at the gap between the vaporization hood 3002 and the converter 100 to prevent oxygen-containing air from entering the converter flue gas treatment system.

[0059] The inactive gas injection device 400 is installed on the inner wall of the vaporization hood 3002, and is located on the side away from the vaporization cooling flue 3001 to ensure that the injected gas can effectively cover the gap between the converter 100 and the vaporization hood 3002. The inactive gas injection device 400 can be a nitrogen sealing nozzle or a carbon dioxide injection device, and is preferably an annular nozzle arranged on the inner wall of the vaporization hood 3002 close to the furnace wall of the converter 100, which is not specifically limited here.

[0060] Optionally, two types of nozzles are arranged outside the vaporization hood 3002, one for injecting carbon dioxide-rich flue gas generated by coal gas combustion, and the other for injecting nitrogen. During daily operation, only the carbon dioxide-rich flue gas nozzle generated by coal gas combustion is opened. The function of this nozzle is to inject CO2 to form a large inertia inert compensation oxygen-free curtain between the converter furnace mouth and the vaporization hood, which plays the role of oxygen-free and providing CO2 carbon source. The injection amount of CO2 is much larger than the reaction amount with carbon-containing powder, and the purpose is to form a large inertia oxygen-free curtain. The nitrogen nozzle is not opened under normal working conditions. When the nozzle generated by coal gas combustion fails during maintenance or coal gas combustion, the nitrogen nozzle is used to form a nitrogen gas curtain for oxygen-free to maintain the normal operation of the converter.

[0061] Specifically, during the steelmaking process, the inactive gas injection device 400 is started to inject inactive gas (such as nitrogen) into the gap between the converter 100 and the vaporization hood 3002 through the nozzle. The injected gas should form a continuous and stable gas curtain to effectively prevent external oxygen from entering the steelmaking converter 100.

[0062] In the converter flue gas treatment system provided in this embodiment, the inactive gas injection device 400 is located on the side of the carbon dioxide-rich flue gas injection device 2002 generated by the combustion of coal gas away from the vaporization cooling flue 3001, and is connected to the inner wall of the vaporization hood 3002. Its main function is to inject gas into the gap formed between the vaporization hood 3002 and the converter 100 to form a barrier to effectively prevent external oxygen from entering the converter 100. This is crucial to maintaining a reducing atmosphere during the steelmaking process, which can ensure the quality of molten steel, reduce air leakage, reduce the CO content in the converter gas, and increase the recovery quality of the converter gas.

[0063] Figure 6 FIG. 1 is a schematic diagram of the structure of another converter flue gas treatment system according to an embodiment of the present invention. Figure 6 As shown, the system further includes: an oxygen lance 500 ; the oxygen lance 500 is connected to the converter 100 and is used to input oxygen into the converter 100 .

[0064] The main function of the oxygen lance 500 is to input high-pressure and high-purity oxygen into the converter 100. The oxygen is blown into the converter 100 at a supersonic speed and can react with carbon, silicon, manganese and other elements in the molten iron to produce an oxidation reaction, thereby achieving the purposes of decarbonization, heating, dephosphorization and desulfurization in the steelmaking process.

[0065] Specifically, the oxygen lance 500 is started to input high-pressure and high-purity oxygen into the converter 100. According to the actual situation in the steelmaking process, the lance position and oxygen flow rate of the oxygen lance 500 are adjusted in time to control the progress and effect of the oxidation reaction.

[0066] Preferably, the operating state of the oxygen lance 500 and the steelmaking process are monitored in real time, including parameters such as the oxygen lance 500 gun position, oxygen flow rate, molten pool temperature, slag condition, etc. According to the monitoring results and steelmaking process requirements, the operating parameters of the oxygen lance 500 are adjusted in time to ensure the stability and safety of the steelmaking process. Among them, the oxygen lance 500 gun position can refer to the height of the oxygen lance 500 nozzle end face from the molten pool liquid surface. The height of the gun position directly affects the impact depth and stirring effect of the oxygen jet on the molten pool, and then affects the progress of the steelmaking process and the quality of the steel. Therefore, it is necessary to adjust the gun position in time according to the actual situation during the steelmaking process. The oxygen flow rate can refer to the amount of oxygen input into the converter 100 through the oxygen lance 500 per unit time. The size of the oxygen flow rate directly affects the rate and effect of the oxidation reaction, and then affects the progress of the steelmaking process and the quality of the steel. Therefore, it is necessary to adjust the oxygen flow rate according to the actual situation during the steelmaking process.

[0067] The converter flue gas treatment system provided in this embodiment, the oxygen lance 500 can stably and efficiently input oxygen into the converter 100, providing sufficient oxygen supply for the oxidation reaction in the steelmaking process, thereby accelerating the oxidation and removal of impurities in the molten steel and improving the steelmaking efficiency.

[0068] In an alternative embodiment, in combination Figure 4 As shown, the above system also includes: blast furnace dust removal equipment (not shown in the figure), carbonaceous powder conveying device, conveying fan and flue (not shown in the figure); blast furnace dust removal equipment, connected with carbonaceous powder containing device 20010 through carbonaceous powder conveying device, used to generate carbonaceous powder, and convey the carbonaceous powder to carbonaceous powder containing device 20010; flue, connected with carbon dioxide rich flue gas injection device 2002 generated by coal gas combustion, conveying carbon dioxide rich flue gas generated after steel plant coal gas combustion and utilization to carbon dioxide rich flue gas injection device 2002 generated by coal gas combustion through conveying fan, forming a large inertia inert compensation oxygen-free curtain between converter 100 furnace mouth and vaporization hood 3002.

[0069] The flue is used to reuse or treat the flue gas generated by the combustion of coal gas through the carbon dioxide-rich flue gas injection device 2002 generated by the combustion of coal gas.

[0070] The blast furnace dust removal equipment collects dust, coke powder and other carbon-containing powders from the blast furnace gas and transports them to the carbon-containing powder transmission device 2001.

[0071] Optionally, the flue gas after combustion of coal gas can be the flue gas of steel rolling heating furnace or the flue gas of power plant, and the carbonaceous powder can be at least one of carbonaceous solid waste, blast furnace dust ash or coal powder injected into blast furnace.

[0072] The converter flue gas treatment system provided in this embodiment, the blast furnace dust removal equipment is a by-product recovery system of the ironmaking process, which generates carbonaceous powder (such as blast furnace bag ash); coke powder, coal powder and other carbonaceous powders are important raw materials in the ironmaking process. The existence of the blast furnace dust removal system or the coal powder injected by the blast furnace ensures a stable supply of raw materials. The flue device after the combustion of coal gas is connected to the carbon dioxide-rich flue gas injection device 2002 generated by the combustion of coal gas, realizing the automatic transmission and supply of flue gas. This helps to reduce manual intervention and waiting time, and improve production efficiency and the overall operation stability of the production line.

[0073] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A converter flue gas treatment system, characterized in that: include: A converter, used for generating flue gas of a second preset temperature at a first preset temperature; wherein the first preset temperature is greater than the second preset temperature; An evaporation cooling assembly is arranged above the converter and is used for exchanging heat with the flue gas through cooling water; A resource receiving component is connected to the vaporization cooling component, and includes a carbon-containing powder transmission device and a carbon dioxide-rich flue gas injection device generated by coal gas combustion. The carbon-containing powder transmission device is used to input carbon-containing powder into the vaporization cooling component, and the carbon dioxide-rich flue gas injection device generated by coal gas combustion is used to input carbon dioxide-rich flue gas generated by coal gas combustion between the converter and the vaporization cooling component to form an inactive oxygen-free curtain; wherein the carbon-containing powder and the carbon dioxide-rich flue gas generated by coal gas combustion generate carbon monoxide under the action of a second preset temperature.

2. The converter flue gas treatment system according to claim 1, characterized in that: The evaporative cooling assembly comprises: A vaporization hood is arranged above the converter, with a gap reserved between the hood and the converter; The vaporization cooling flue is connected to the vaporization hood and is used for exchanging heat with the flue gas through cooling water to reduce the flue gas temperature, recover the converter gas and recover heat energy.

3. The converter flue gas treatment system according to claim 2, characterized in that: The carbon-containing powder material transmission device is connected to the vaporization cooling flue, and is used to receive the carbon-containing powder material and spray the carbon-containing powder material into the vaporization cooling flue; The carbon dioxide-rich flue gas injection device generated by the combustion of the coal gas is arranged on the inner wall of the vaporization hood and close to the upper end of the furnace wall of the converter, forming an annular nozzle, which is used to form an inactive oxygen-free curtain in the gap between the converter furnace mouth and the vaporization hood to isolate the outside air from entering the converter coal gas and prevent the converter coal gas from overflowing.

4. The converter flue gas treatment system according to claim 3, characterized in that: The carbon-containing powder material transmission device comprises: a carbon-containing powder material containing device, a pneumatic conveying device and a carbon-containing powder material injection device; The carbon-containing powder receiving device is used to receive the processed carbon-containing powder and add the carbon-containing powder into the carbon-containing powder injection device; The carbon-containing powder injection device is connected to the vaporization cooling flue and the carbon-containing powder containing device respectively, and is used to receive the carbon-containing powder and inject the carbon-containing powder into the vaporization cooling flue under the action of the carrier gas in the pneumatic conveying device.

5. The converter flue gas treatment system according to any one of claims 2 to 4, characterized in that: Also includes: Inert gas injection device; The inactive gas injection device is arranged on the lower side of the vaporization hood away from the vaporization cooling flue relative to the carbon dioxide-rich flue gas injection device generated by the combustion of the coal gas, and is used to form an annular injection gas curtain in the gap between the vaporization hood and the converter to prevent oxygen-containing air from entering the converter flue gas treatment system.

6. The converter flue gas treatment system according to claim 5, characterized in that: The inert gas is nitrogen or an inert gas.

7. The converter flue gas treatment system according to claim 5, characterized in that: The inactive gas injection device is an annular nozzle arranged at the outer edge of the inner wall of the vaporization fume hood close to the furnace wall of the converter.

8. The converter flue gas treatment system according to claim 4, characterized in that: Also includes: Carbonaceous powder conveying device, conveying fan and flue; The carbon-containing powder transporting device is used to transport the carbon-containing powder and transfer the carbon-containing powder to the carbon-containing powder containing device; The conveying fan is used to transmit the flue gas generated after the combustion and utilization of the steel plant gas through the flue to the carbon dioxide-rich flue gas injection device generated by the combustion of the gas.

9. The converter flue gas treatment system according to claim 8, characterized in that: The carbon-containing powder is at least one of carbon-containing solid waste, blast furnace dust or pulverized coal injected into the blast furnace.

10. The converter flue gas treatment system according to any one of claims 6 to 9, characterized in that: Also includes: Oxygen lance; The oxygen lance is connected to the converter and is used to input oxygen into the converter.

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