Blast furnace gas purification control method and top water injection system

Abstract

The application provides a blast furnace gas purification control method and a furnace top water injection system. The method comprises the following steps: obtaining a current average temperature of blast furnace gas in a target area; determining whether to trigger a spraying request based on the current average temperature and a preset spraying start temperature; in response to the current triggered spraying request, controlling a spray gun to spray cooling liquid according to preset working parameters according to the current average temperature and a plurality of calibration temperature ranges; when the average temperature of the cooled blast furnace gas is less than a preset spraying stop temperature, stopping the spraying of the spray gun, and outputting blast furnace gas containing ammonium chloride; wherein the preset spraying stop temperature represents the crystallization temperature of ammonium chloride generated by the reaction of ammonia gas and hydrogen chloride in the blast furnace gas. Through the method provided by the application, the problems of device blockage, hydrolysis agent deactivation and pipeline corrosion in the dry desulfurization system caused by chlorine-containing impurities are solved.

Description

Technical Field

[0001] This application relates to the field of blast furnace gas purification technology, and in particular to a blast furnace gas purification control method and a furnace top water pumping system. Background Technology

[0002] In the blast furnace ironmaking process, raw materials such as ore and coke are smelted to produce pig iron, blast furnace gas, and slag. my country produces approximately 840-960 billion cubic meters of blast furnace gas annually. The emitted sulfides not only pollute the environment but also toxicize adsorbents and catalysts used in subsequent gas separation and chemical synthesis processes. Therefore, blast furnace gas desulfurization is crucial and is an important technology for achieving ultra-low emissions in the steel industry.

[0003] The distribution and content of sulfur in blast furnace gas have the following characteristics: organic sulfur content accounts for more than 70%, with COS being the main component, while the content of inorganic sulfur such as H2S is not high. The entire process of blast furnace gas production and desulfurization is usually as follows: blast furnace ironmaking - multi-stage dust removal - TRT (Top-pressure Recovery Turbine) / BFPRT (Blast Furnace Power Recovery Turbine) - blast furnace gas fine desulfurization. Among them, dry desulfurization is a commonly used method for fine desulfurization of blast furnace gas. It first removes most of the dust and chlorine-containing impurities in the system, then hydrolyzes organic sulfur into hydrogen sulfide, and finally uses desulfurizing agents such as activated carbon to remove H2S, thereby removing most of the sulfur-containing substances in the blast furnace gas. The entire process is usually dust removal and chlorine removal - hydrolysis - desulfurization.

[0004] Due to the presence of chlorine in blast furnace gas, hydrogen chloride can adhere to the catalyst in dry desulfurization processes, causing catalyst deactivation. Under saturated humidity conditions, it forms hydrochloric acid solution, leading to corrosion of pipelines and equipment. Hydrogen chloride can also react with ammonia in blast furnace gas to produce ammonium chloride. At low temperatures and humidity, ammonium chloride particles crystallize and adhere to the wire mesh of equipment such as the impurity removal tower, hydrolysis tower, and desulfurization tower, causing blockages.

[0005] Current dechlorination technologies employ various methods such as freeze-drying and alkaline / water spraying before the chlorine enters the hydrolysis tower. However, these methods are all end-of-pipe treatments and inevitably suffer from problems such as high energy consumption, large waste volume, and low dechlorination accuracy. Summary of the Invention

[0006] In view of the above problems, one objective of this application is to provide a blast furnace gas purification and control method that effectively solves problems such as device blockage, hydrolysate deactivation, and pipeline corrosion in dry desulfurization systems caused by chlorine impurities. A second objective of this application is to provide a furnace top water injection system that addresses the chlorine problem in blast furnace gas at its source, controlling chlorine impurities before they reach the dry desulfurization system and ensuring its normal operation.

[0007] To achieve one of the objectives, the technical solution of this application is:

[0008] A blast furnace gas purification and control method is applied to a top water spraying system. The top water spraying system includes multiple spray guns for spraying coolant into the top region of the blast furnace reactor to reduce the temperature of the blast furnace gas within the reactor. The method includes:

[0009] Obtain the current average temperature of the blast furnace gas within the target area;

[0010] Based on the current average temperature and the preset spray start temperature, determine whether to trigger a spray request;

[0011] In response to the currently triggered spray request, the spray gun is controlled to spray the coolant according to preset operating parameters based on the current average temperature and multiple calibrated temperature ranges;

[0012] When the average temperature of the cooled blast furnace gas is lower than the preset stop temperature, the spraying of the spray gun is stopped, and the blast furnace gas containing ammonium chloride is output.

[0013] The preset shutdown temperature is characterized as the crystallization temperature of ammonium chloride produced by the reaction of ammonia and hydrogen chloride in the blast furnace gas.

[0014] Optionally, the step of controlling the spray gun to spray the coolant according to preset operating parameters in response to a currently triggered spray request, based on the current average temperature and multiple calibrated temperature ranges, includes:

[0015] Set different calibration temperature ranges for the blast furnace gas, and establish preset operating parameters corresponding to each calibration temperature range;

[0016] Match the current average temperature with the target temperature range, wherein the target temperature range is characterized as a calibrated temperature range that includes the current average temperature;

[0017] Based on the target temperature range, the spray gun is controlled to spray the coolant according to the preset operating parameters corresponding to the target temperature range.

[0018] Optionally, the blast furnace reactor is equipped with multiple riser pipes, and at least one spray gun is provided at each riser pipe; wherein, the step of controlling the spray gun to spray the coolant according to preset operating parameters in response to a currently triggered injection request, based on the current average temperature and multiple calibrated temperature ranges, further includes:

[0019] The temperature of the blast furnace gas inside each of the riser pipes is obtained.

[0020] Based on the relationship between the temperatures inside the multiple pipes, the spray position for this coolant spraying is determined from the multiple spray guns;

[0021] According to the respective spray positions of the multiple spray guns, at least one of the spray guns is controlled to spray the coolant at the determined target spray position.

[0022] Optionally, determining the injection position for this coolant injection from among the multiple spray guns based on the magnitude relationship between the temperatures inside the multiple pipes includes:

[0023] Obtain the pipe position of each riser pipe and the spray position of each spray gun;

[0024] Get the number of spray guns that perform coolant spraying this time;

[0025] Based on the relationship between the multiple pipe temperatures from highest to lowest, and based on the number of spray guns, the spray positions that have a positional pairing relationship with the target pipe position are determined one by one;

[0026] The target pipe location is characterized as the pipe location corresponding to at least one of the riser pipes with high temperature.

[0027] Optionally, the preset operating parameters include at least one of the following: number of spray guns, spray flow rate, spray pressure, spray angle, and spray particle size.

[0028] Optionally, the blast furnace gas purification system includes a front-end dust removal system and a back-end desulfurization system, wherein the front-end dust removal system includes at least a bag filter; wherein, obtaining the current average temperature of the blast furnace gas in the target area includes:

[0029] Obtain the current average temperature of the blast furnace gas in the top region of the blast furnace reactor; or,

[0030] Obtain the current average temperature of the blast furnace gas in the inlet area of ​​the bag filter.

[0031] Optionally, when the target area is the furnace top area, the preset shutdown temperature is 130-200℃; when the target area is the inlet area of ​​the bag filter, the preset shutdown temperature is 110-150℃.

[0032] Optionally, determining whether to trigger a spray request based on the current average temperature and the preset spray start temperature includes:

[0033] Based on the current average temperature, the current average temperature is reduced through a pretreatment step; the pretreatment step includes a furnace top air reduction step or a material pressing step.

[0034] When the current average temperature after the drop is lower than the preset injection start temperature, the injection request is not triggered;

[0035] The injection request is triggered when the current average temperature after the temperature drop is higher than the preset injection start temperature.

[0036] Optionally, the step of controlling the spray gun to spray the coolant according to the preset operating parameters corresponding to the target temperature range, based on the target temperature range, includes:

[0037] Obtain the real-time average temperature of the cooled blast furnace gas;

[0038] Based on different calibration temperature ranges, obtain the real-time target temperature range containing the real-time average temperature;

[0039] Based on the real-time target temperature range, the spray gun is controlled to switch to operate with the preset working parameters corresponding to the real-time target temperature range.

[0040] This application also provides a furnace top water spraying system, which includes multiple spray guns for spraying coolant into the furnace top region of the blast furnace reactor to reduce the temperature of the blast furnace gas inside the reactor; the system further includes:

[0041] The acquisition module is used to acquire the current average temperature of the blast furnace gas within the target area;

[0042] The triggering judgment module is used to determine whether to trigger a spraying request based on the current average temperature and the preset spraying temperature;

[0043] The trigger control module is used to respond to the currently triggered spray request and control the spray gun to spray the coolant according to the preset working parameters based on the current average temperature and multiple calibrated temperature ranges.

[0044] The gas purification module is used to determine when the average temperature of the cooled blast furnace gas is lower than the preset stop temperature, stop the spraying of the spray gun, and output the blast furnace gas containing ammonium chloride.

[0045] The preset shutdown temperature is characterized as the crystallization temperature of ammonium chloride produced by the reaction of ammonia and hydrogen chloride in the blast furnace gas.

[0046] Optionally, the trigger control module includes:

[0047] The calibration module is used to set different calibration temperature ranges for the blast furnace gas and establish preset working parameters corresponding to each calibration temperature range.

[0048] A matching module is used to match the current average temperature with a target temperature range, wherein the target temperature range is characterized as a calibrated temperature range that includes the current average temperature.

[0049] The control module is used to control the spray gun to spray the coolant according to the preset working parameters corresponding to the target temperature range, based on the target temperature range.

[0050] Optionally, the blast furnace reactor is equipped with multiple riser pipes, and at least one spray gun is installed at each riser pipe; wherein the trigger control module further includes:

[0051] The acquisition submodule is used to acquire the temperature inside the blast furnace gas in each of the riser pipes;

[0052] The determining module is used to determine the injection position of the coolant injection to be performed from the multiple spray guns based on the magnitude relationship between the multiple tube temperatures;

[0053] An execution module is used to control at least one of the spray guns to spray the coolant at a determined target spray position according to the spray positions corresponding to each of the multiple spray guns.

[0054] Optionally, the determining module includes:

[0055] A position acquisition unit is used to acquire the pipe position of each of the riser pipes and the spray position of each of the spray guns;

[0056] The quantity acquisition unit is used to acquire the number of spray guns performing coolant spraying in this operation.

[0057] The determination submodule is used to determine the spray positions that have a positional pairing relationship with the target pipe position one by one, based on the relationship between the multiple pipe internal temperatures from large to small and the number of spray guns.

[0058] The target pipe location is characterized as the pipe location corresponding to at least one of the riser pipes with high temperature.

[0059] Optionally, the blast furnace gas purification system includes a front-end dust removal system and a back-end desulfurization system, wherein the front-end dust removal system includes at least a bag filter; and the acquisition module includes:

[0060] The first acquisition module is used to acquire the current average temperature of the blast furnace gas in the top region of the blast furnace reactor; or,

[0061] The second acquisition module is used to acquire the current average temperature of the blast furnace gas in the inlet area of ​​the bag filter.

[0062] Optionally, the trigger determination module includes:

[0063] A pretreatment module is used to reduce the current average temperature based on the current average temperature through pretreatment steps; the pretreatment steps include a furnace top air reduction step or a material pressing step;

[0064] The determination module is used to avoid triggering the injection request when the current average temperature after the temperature drop is lower than the preset injection temperature; and to trigger the injection request when the current average temperature after the temperature drop is higher than the preset injection temperature.

[0065] Optionally, the furnace top water pumping system further includes:

[0066] The first real-time acquisition unit is used to acquire the real-time average temperature of the cooled blast furnace gas.

[0067] The second real-time acquisition unit is used to acquire a real-time target temperature range containing the real-time average temperature based on different calibration temperature ranges.

[0068] The real-time control module is used to control the spray gun to switch to the preset working parameters corresponding to the real-time target temperature range, based on the real-time target temperature range.

[0069] This application has the following advantages:

[0070] This invention provides a blast furnace gas purification control method applied to a top water spraying system. The top water spraying system includes multiple spray guns, which are used to spray coolant into the top region of the blast furnace reactor to reduce the temperature of the blast furnace gas in the reactor. The method includes: acquiring the current average temperature of the blast furnace gas in the target region; determining whether to trigger a spraying request based on the current average temperature and a preset spraying start temperature; responding to the currently triggered spraying request, controlling the spray guns to spray the coolant according to preset operating parameters based on the current average temperature and multiple calibrated temperature ranges; stopping the spraying of the spray guns when the average temperature of the cooled blast furnace gas is lower than a preset spraying stop temperature, and outputting blast furnace gas containing ammonium chloride; wherein, the preset spraying stop temperature is characterized as the crystallization temperature of ammonium chloride generated by the reaction of ammonia and hydrogen chloride in the blast furnace gas.

[0071] By adopting the technical solution of the present invention, when implementing the control method of the present invention, the average temperature of the blast furnace gas coming out of the blast furnace reactor is controlled to be lower than the crystallization temperature of ammonium chloride generated by the reaction of ammonia and hydrogen chloride in the blast furnace gas. This causes most of the hydrogen chloride and ammonia in the blast furnace reactor to react in the direction of generating ammonium chloride particles, so that most of the chlorine-containing impurities are converted into ammonium chloride and intercepted by the dust removal system in the blast furnace gas purification system, so that the ammonium chloride is removed before entering the dry desulfurization system.

[0072] Thus, by controlling the temperature at the top of the blast furnace, this embodiment of the invention achieves chlorine control after the bag filter, reducing the risk of ammonium chloride clogging the equipment, causing catalyst deactivation, and corroding the equipment in the dry desulfurization system. It achieves front-end chlorine removal, and source control is more economical and efficient than end-of-pipe treatment.

[0073] Furthermore, the control method provided in this embodiment of the invention relies on the dust removal system of the blast furnace smelting system to intercept ammonium chloride, which saves the consumption and replacement cost of hydrolysate, generates no additional waste liquid, reduces environmental pollution, lowers system energy consumption, and has advantages in resource utilization, environmental protection, and economy, while also reducing the complexity of the system.

[0074] The advantages of the furnace top water spraying system mentioned above compared to the existing technology are the same as those of the blast furnace gas purification and control method, and will not be repeated here. Attached Figure Description

[0075] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0076] Figure 1 This is a flowchart of the steps of a blast furnace gas purification and control method provided in an embodiment of this application;

[0077] Figure 2 This is a structural block diagram of a furnace top water pumping system provided in one embodiment of this application. Detailed Implementation

[0078] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0079] To gain a clearer and more accurate understanding of the blast furnace gas purification and control method provided in the embodiments of this application, the overall process flow of blast furnace ironmaking is first described in general terms.

[0080] A blast furnace reactor is a large reactor used for smelting pig iron. It heats coke, ore, and flux to high temperatures, causing a reduction reaction that produces pig iron, blast furnace gas, and slag. The specific composition of blast furnace gas is affected by factors such as the fuel, raw materials, and production process used, but it generally contains harmful impurities such as sulfides, chlorides, ammonia, and dust. These harmful impurities typically require treatment to achieve resource recovery while meeting blast furnace gas emission requirements.

[0081] This invention mainly discusses the impact of chlorine presence in the blast furnace gas desulfurization process. The specific process route for blast furnace gas desulfurization is as follows: Blast furnace gas exits from the riser pipe at the top of the blast furnace and sequentially passes through gravity dust removal, cyclone dust removal, and bag filter dust removal systems to reduce the dust content to meet standard emission requirements. It then enters a TRT / BPRT system, where gas pressure and temperature / pressure are used to generate electricity. Next, it passes through a hydrolysis tower to convert carbonyl sulfide and carbon disulfide into hydrogen sulfide. Finally, it enters a desulfurization tower where a dry desulfurizing agent removes hydrogen sulfide from the gas. After desulfurization, without co-firing other sulfur-containing fuels, the sulfur dioxide concentration in the flue gas emitted from the end-use gas outlet meets ultra-low emission requirements.

[0082] To elaborate, chlorine in blast furnaces primarily originates from iron-containing raw materials and blast furnace fuels, including coal, coke, lump ore, sinter, and additives; chlorine mainly exists in the form of inorganic compounds. The destinations of chlorine in blast furnaces include gravity ash, bag filter ash, slag, pig iron, blast furnace gas, and gas scrubbing water. Chlorine emissions from blast furnace gas account for 88.0%-97.5% of the total chlorine emissions. This chlorine then enters the dust removal system for diversion. For dry dust removal blast furnaces, the chlorine carried away by the top gas and collected by the dust removal system, forming gravity ash and bag filter ash, constitute the largest expenditure item for chlorine load, accounting for more than 75%, mainly concentrated in bag filter ash.

[0083] In a blast furnace, chlorine primarily enters the blast furnace gas in the form of hydrogen chloride. The gas flows from bottom to top, while the material flows from top to bottom. Hydrogen chloride rises with the blast furnace gas, adhering to the furnace charge and furnace walls. Some of the hydrogen chloride undergoes a series of complex physicochemical reactions with substances in the furnace charge, and the products continue to descend with the furnace charge, being released again as hydrogen chloride. Chlorine thus circulates and accumulates within the blast furnace. The remaining unreacted hydrogen chloride escapes with the gas from the furnace top and enters the subsequent dust removal system.

[0084] Of the hydrogen chloride, a large portion still flows to the dry desulfurization system after passing through the dust removal system. The situation of many companies currently operating projects has revealed the problems mentioned in the background technology. Due to the presence of chlorine in the blast furnace gas desulfurization system, problems such as ammonium chloride blockage of the hydrolysis tower and desulfurization tower, deactivation of hydrolysate, and pipeline corrosion have been caused, which have seriously affected the normal operation of the equipment and the service life of the hydrolysate.

[0085] In view of the above problems, the first aspect of this application provides a blast furnace gas purification and control method, applied to a furnace top water spraying system, the furnace top water spraying system including multiple spray guns, the spray guns being used to spray coolant into the furnace top area of ​​the blast furnace reactor to reduce the temperature of the blast furnace gas in the blast furnace reactor; Figure 1 This is a flowchart illustrating the steps of a blast furnace gas purification and control method according to an embodiment of this application, as shown below. Figure 1 As shown, the method includes:

[0086] S1. Obtain the current average temperature of the blast furnace gas within the target area;

[0087] In this embodiment, the blast furnace smelting system completes the smelting of pig iron and the purification of blast furnace gas generated during the pig iron smelting process. The blast furnace smelting system typically includes a blast furnace reactor and a blast furnace gas purification system connected to each other. The blast furnace reactor transmits the generated blast furnace gas to the blast furnace gas purification system for purification. A top water spraying system is configured in the top area of ​​the blast furnace reactor to spray coolant into the top area of ​​the blast furnace reactor.

[0088] It is known that the reaction of ammonia with hydrogen chloride to produce ammonium chloride is a reversible reaction. Based on the equilibrium constant of the reaction between ammonia and hydrogen chloride in blast furnace gas, lower temperatures are more favorable for ammonium chloride formation. If the temperature of the blast furnace gas in the blast furnace top area is not high, most of the hydrogen chloride in the blast furnace will react with ammonia in the direction of ammonium chloride particle formation. If the temperature at the blast furnace top is high, ammonium chloride will decompose into hydrogen chloride and ammonia. Hydrogen chloride and ammonia can pass through the dust removal system (gravity dust collector, cyclone dust collector, bag filter) to reach the dry desulfurization system, where they will regenerate into ammonium chloride after cooling, causing equipment blockage, corrosion, and catalyst poisoning.

[0089] Therefore, by controlling the ammonium chloride in the blast furnace gas before TRT / BPRT, the gas temperature at the top of the blast furnace can be reduced, allowing the chlorine in the blast furnace gas to exist to the maximum extent in the form of ammonium chloride. Ultimately, it will be intercepted by the bag filter dust collection system, so that the ammonium chloride is removed before entering the dry desulfurization system, thereby reducing the chlorine content in the blast furnace gas after the bag filter dust collection system.

[0090] Specifically, in some embodiments, the temperature of the blast furnace gas in the top area of ​​the blast furnace reactor can be monitored in real time using devices such as temperature sensors to obtain the current average temperature, which serves as the basis for judgment in subsequent steps. For example, temperature sensors can be evenly distributed at the four corners of the northeast, southeast, northwest, and southwest of the top area of ​​the blast furnace reactor, and the average temperature of the blast furnace gas can be obtained based on the real-time temperatures of the blast furnace gas measured at these four locations.

[0091] In some other embodiments, the blast furnace gas purification system includes a front-end dust removal system and a back-end desulfurization system. The front-end dust removal system may include a gravity dust collector, a cyclone dust collector, and a bag filter. The current average temperature of the blast furnace gas in the inlet area of ​​the bag filter can be monitored in real time through devices such as temperature sensors.

[0092] As a further explanation of this embodiment, the temperature of the blast furnace gas output from the riser pipe at the top of the blast furnace has a mapping relationship with the temperature of the blast furnace gas entering the bag filter. That is to say, the temperature of the blast furnace gas gradually decreases during the process of being transferred from the riser pipe of the blast furnace reactor to the bag filter, and the decreasing trend is usually around 20 to 40°C. Moreover, the temperature decreasing trend is greater in winter than in summer.

[0093] Therefore, the current average temperature in the furnace top area or the current average temperature of the blast furnace gas in the inlet area of ​​the bag filter can be used as the basis for judgment in subsequent steps.

[0094] S2. Based on the current average temperature and the preset spray start temperature, determine whether to trigger a spray request;

[0095] It is known that when the temperature at the top of the blast furnace rises, ammonium chloride decomposes into hydrogen chloride and ammonia. To avoid the decomposition of ammonium chloride, the current average temperature can be compared with the preset start-up temperature to determine whether the current average temperature has reached the threshold for activating the top water injection system. This ensures that the spray guns can be activated in time to inject coolant when the blast furnace gas temperature is too high, thereby effectively avoiding or mitigating the decomposition reaction of ammonium chloride and maintaining the blast furnace top at a relatively low temperature, which is more conducive to the formation of ammonium chloride.

[0096] In some embodiments, the preset start-up temperature can be understood as the temperature at which ammonium chloride begins to decompose rapidly. It is understood that, since the decomposition and formation of ammonium chloride are mostly synchronous, in some embodiments, the preset start-up temperature can be defined as the temperature at which the decomposition rate of ammonium chloride is much greater than the formation rate of ammonium chloride.

[0097] In some embodiments, based on the blast furnace operating conditions and actual production, the preset injection temperature is preferably set to 180°C. When the current average temperature of the blast furnace gas is higher than the preset injection temperature, it can be considered that ammonium chloride tends to decompose, and hydrogen chloride will escape from the bag filter to the dry desulfurization system. When the current average temperature of the blast furnace gas is lower than the preset injection temperature, it can be considered that ammonium chloride tends to form and is intercepted by the bag filter system, thereby controlling chlorine before the dry desulfurization system.

[0098] S3. In response to the triggered spray request, based on the current average temperature and multiple calibrated temperature ranges, control the spray gun to spray coolant according to preset operating parameters:

[0099] When the current average temperature of the blast furnace gas exceeds the preset injection temperature, an injection request is triggered, activating the water spraying mechanism of the furnace top water spraying system. This means controlling the spray guns to begin spraying coolant into the blast furnace reactor. The cooling efficiency of the blast furnace gas is related to factors such as the volume and area of ​​the coolant sprayed by the spray guns. In some embodiments, the spray volume and spray area of ​​the coolant are related to the number of spray guns and the operating parameters of each spray gun. When cooling is required, the system adjusts key parameters such as the spray volume and spray area of ​​the spray guns according to preset operating parameters to ensure that the coolant can uniformly and effectively cover the blast furnace top area, thereby efficiently reducing the temperature of the blast furnace gas.

[0100] Therefore, by reasonably adjusting the preset operating parameters, the distribution and coverage of the coolant can be affected, thereby influencing the cooling effect in the blast furnace top area. In some embodiments, the preset operating parameters include at least one of the following: number of spray guns, spray flow rate, spray pressure, spray angle, and spray water particle size. In this embodiment, increasing the number of spray guns can increase the coverage area and spray water volume, enhancing the cooling effect; increasing the spray flow rate can increase the spray water volume, enhancing the cooling effect; increasing the spray pressure can increase the spray area and spray flow rate, enhancing the cooling effect; selecting a suitable spray angle can increase the area covered by the coolant in the furnace top area, improving the cooling effect; the smaller the spray water particle size, the faster it evaporates in the blast furnace gas, and reducing the spray water particle size can improve the atomization degree of the coolant, improving the cooling effect; conversely, the opposite is true.

[0101] For example, if the current average temperature is significantly higher than the preset spraying temperature, the corresponding parameter values ​​of at least one of the following—the number of spray guns, the spray flow rate, the spray pressure, and the spray particle size—can be increased, or any one of them can be significantly increased, to increase the amount of coolant sprayed and the spray area, thereby achieving rapid and uniform cooling. If the current average temperature is slightly higher than the preset spraying temperature, the corresponding parameter values ​​of any one of the following—the number of spray guns, the spray flow rate, the spray pressure, and the spray particle size—can be increased, or any one of them can be slightly increased.

[0102] In this way, the comprehensive adjustment of multiple parameters can make the water spraying system more flexible and efficient, ensuring that the coolant can effectively cover the top area of ​​the blast furnace and achieve the expected effect of reducing the required temperature efficiency.

[0103] Another significant advancement in this embodiment is that the combined adjustment results of various parameters correspond to multiple calibration temperature ranges. In other words, each calibration temperature range corresponds to a specific preset working parameter. By simply comparing the current average temperature with the calibration temperature range, the optimal combination of at least one working parameter that meets the expected cooling effect can be obtained.

[0104] Therefore, based on the calibrated temperature range, the number of spray guns and the working parameters of each spray gun are reasonably selected and adjusted to match the spray water volume with the cooling purpose, so as to reduce the gas temperature to the optimal range, avoid water waste, achieve the best cooling effect, and promote the effective generation and interception of ammonium chloride.

[0105] S4. When the average temperature of the cooled blast furnace gas is lower than the preset stop spraying temperature, the spraying of the spray gun is stopped, and the blast furnace gas containing ammonium chloride is output; wherein, the preset stop spraying temperature is characterized by the crystallization temperature of ammonium chloride generated by the reaction of ammonia gas and hydrogen chloride in the blast furnace gas.

[0106] In this embodiment, when the blast furnace gas cools to a preset stop-injection temperature, the injection of the blast furnace lance is stopped. At this time, a stop-injection signal of the lance is acquired, and a gas transmission command is output. Based on the gas transmission command, the blast furnace gas containing the ammonium chloride is output. Specifically, after the injection of the lance stops, the blast furnace gas containing ammonium chloride is controlled to be transmitted through the blast furnace reactor to the blast furnace gas purification system, where the purification of the blast furnace gas is completed.

[0107] It's worth noting that the transmission of blast furnace gas can be judged and executed through a PLC (Programmable Logic Controller) control console. A PLC is a controller specifically designed for industrial automation. In a blast furnace smelting system, a PLC can control and monitor various equipment, and schedule and coordinate the operation of various subsystems. Upon receiving control signals from the PLC, the execution unit of the subsystem is responsible for controlling the transmission of blast furnace gas containing ammonium chloride, such as by controlling the opening and closing of valves, pumps, and pipelines. For example, the PLC, through the corresponding execution unit, can open the corresponding pipeline valves between the blast furnace reactor and the blast furnace gas purification system, controlling the flow direction of the blast furnace gas.

[0108] When the temperature at the top of the blast furnace drops to a certain level, hydrogen chloride and ammonia mainly react to form ammonium chloride, rather than decomposing it. In some embodiments, the preset shutdown temperature can be understood as the crystallization temperature of ammonium chloride, i.e., the temperature at which ammonium chloride stops decomposing. It can be understood that since the decomposition and formation of ammonium chloride are mostly synchronous, in some embodiments, the preset shutdown temperature can also be defined as the temperature at which the decomposition of ammonium chloride is significantly slowed down.

[0109] The average temperature of the cooled blast furnace gas is compared with the preset shutdown temperature to determine whether the temperature of the cooled blast furnace gas has reached the point where the furnace top water injection system needs to be shut down. This ensures that the water injection can be stopped in time when the cooled blast furnace gas is mainly producing ammonium chloride, thus avoiding water waste and excessive cooling of the system and saving costs.

[0110] In order to avoid the bag clogging caused by free water at the bag, the water spraying in this embodiment of the invention can be stopped when the water content of the material entering the furnace and the air humidity are just below the preset stop spraying temperature, so as to keep the temperature of the cooled blast furnace gas still above about 110°C.

[0111] In some embodiments, the preset shutdown temperature can be preferably set to 150°C, depending on the blast furnace operating conditions and actual production. When the average temperature of the cooled blast furnace gas is lower than the preset shutdown temperature, it can be considered that ammonium chloride tends to form, or that ammonium chloride stops decomposing or decomposes more slowly and is intercepted by the bag filter dust collection system, thereby controlling the chlorine element before the dry desulfurization system.

[0112] It should be understood that the threshold for comparing the current average temperature of blast furnace gas with the preset start-up temperature varies depending on the target area. Preferably, when the target area is the furnace top area, the preset stop-up temperature is 130℃-200℃, preferably 150℃; when the target area is the inlet area of ​​the bag filter, the preset stop-up temperature is 110℃-150℃, preferably 110℃.

[0113] Within the preset stop spraying temperature range, after water spraying is stopped, the average temperature of the furnace top gas after water spraying can be controlled to be no greater than 190℃ and no less than 140℃, or the gas temperature at the bag filter inlet after water spraying can be controlled to be no greater than 150℃ and no less than 110℃.

[0114] In summary, compared with traditional end-of-pipe dechlorination technology, the embodiments of the present invention solve the problem of chlorine in blast furnace gas at the source of the system, control the chlorine element before the dry desulfurization system of blast furnace gas, and solve the problems that may be caused by ammonium chloride entering the dry desulfurization system, such as the clogging of the hydrolysis tower and desulfurization tower wire mesh by ammonium chloride, deactivation of hydrolysate, and pipeline corrosion.

[0115] This invention achieves dynamic temperature regulation of blast furnace gas by rationally controlling the furnace top water pumping system, ensuring stable operation of the blast furnace, and minimizing energy consumption and system complexity while ensuring the purification effect of blast furnace gas.

[0116] Compared to traditional dechlorination technologies, this invention utilizes the reaction mechanism between ammonia and hydrogen chloride inherent in blast furnace gas, and intercepts ammonium chloride through the dust removal system built into the blast furnace smelting system. This achieves the removal of most of the chlorine and at least some of the ammonia, eliminating the need to add dechlorinating agents such as alkaline solutions to the blast furnace gas. This makes it more economical and efficient, reducing the cost of external additives and the environmental impact.

[0117] This invention also utilizes the furnace top water pumping system built into the blast furnace smelting system to control chlorine at the source. Therefore, no additional process flow or operation steps are added, which improves the stability and reliability of the system, reduces the complexity of operation and maintenance, and meets the requirements of sustainable development and green production.

[0118] Further, step S3 includes:

[0119] Step S31: Set different calibration temperature ranges for the blast furnace gas and establish preset operating parameters corresponding to each calibration temperature range.

[0120] Step S32: Match the current average temperature and the target temperature range, wherein the target temperature range is characterized as a calibrated temperature range that includes the current average temperature;

[0121] Step S33: Based on the target temperature range, control the spray gun to spray the coolant according to the preset working parameters corresponding to the target temperature range.

[0122] Specifically, embodiments of the present invention can achieve optimal cooling fluid spraying by setting different calibrated temperature ranges, corresponding to the activation of different numbers of spray guns, and controlling each spray gun to operate with corresponding parameters. More specifically, different calibrated temperature ranges are preset, and preset operating parameters corresponding to each calibrated temperature range are established, including the number of spray guns, spray flow rate, spray pressure, spray angle, and spray particle size. By monitoring the current average temperature of the blast furnace top region in real time and comparing it with different calibrated temperature ranges, a target temperature range containing the current average temperature is found. This allows the blast furnace cooling system to control the spray guns to spray coolant using appropriate preset operating parameters, making the coolant more adaptable to the current temperature conditions and improving the adaptability and cooling effect of the blast furnace top cooling system.

[0123] Assume there are two preset calibration temperature ranges, namely the first calibration temperature range and the second calibration temperature range. If the current actual average temperature is within the first calibration temperature range, then the system will match the first calibration temperature range. The PLC will select the preset operating parameters corresponding to the first calibration temperature range to start the spray gun, such as the determined number of spray guns, spray flow rate, spray pressure, spray angle, and other operating parameters to start the spray gun spraying.

[0124] In this way, by establishing the relationship between the calibrated temperature range and the preset operating parameters, suitable coolant injection conditions are provided for blast furnace gas at different temperatures, so as to ensure that a balance is found between cooling effect, water injection cost and system stability, and comprehensively consider the operation effect and economy of the blast furnace gas purification system.

[0125] To facilitate a detailed explanation of the blast furnace gas purification and control method of this application, taking a commonly used iron and steel smelting process as an example, the furnace top water spraying system typically includes a pressurized water pump, valves, spray guns, a control system, and multiple water pipelines. The pressure of the main water pipeline is always maintained at a constant level, and multiple spray guns are arranged in a ring around the furnace top area. Under normal circumstances, with a constant pressure in the main water pipeline, the amount of water injected into the blast furnace by a single spray gun per unit time is constant. After the spray gun selection and fluid pressure are determined, the spray particle size is basically determined. The multiple spray guns arranged on the furnace top, including nozzles, can have their number of spray guns activated and their spray flow rate adjusted by controlling the corresponding valves.

[0126] For example, the spray gun can be a single-fluid automatic telescopic atomizing anti-clogging spray gun, which is arranged obliquely downward at the throat of the blast furnace, and the sprayed water mist can cover the throat without spraying onto the furnace wall. Given a fixed spray gun selection and main water pipeline pressure, and with identical operating parameters such as spray flow rate, spray pressure, spray distance, and spray particle size, this embodiment of the invention establishes spray conditions corresponding to multiple calibrated temperature ranges by setting the number of spray guns. These spray conditions can be:

[0127] Each blast furnace can be equipped with 8 single-fluid atomizing spray guns for top water spraying, with a single spray gun designed to have a water flow rate of 7m³ / h. 3 / h-20m 3 / h, spray angle 90°, coverage area 7m 2 -9m 2 The water spray distance is 1.5m-3m, the atomized particle size is 200μm-350μm, and the first calibration temperature range is set to 200℃-230℃ with 1 spray gun; the second calibration temperature range is set to 230℃-300℃ with 2 spray guns; the third calibration temperature range is set to 300℃-400℃ with 3 spray guns; the fourth calibration temperature range is set to 400℃-500℃ with 4 spray guns; the fifth calibration temperature range is set to 500℃-600℃ with 6 spray guns; and the sixth calibration temperature range is set to greater than 600℃ with 8 spray guns. Therefore, when the current average temperature of the blast furnace gas is T:

[0128] If 200℃≤T<230℃, start one spray gun;

[0129] If 230℃≤T<300℃, start 2 spray guns;

[0130] If 300℃≤T<400℃, start 3 spray guns;

[0131] If 400℃≤T<500℃, start 4 spray guns;

[0132] If 500℃≤T<600℃, start 6 spray guns;

[0133] If 600℃≤T, start 8 spray guns.

[0134] If the average temperature of the blast furnace gas is less than 150°C after the spray gun stops spraying, then stop spraying water.

[0135] It is understandable that the number of spray guns can be determined based on the blast furnace operating conditions, such as the initial temperature and flow rate of the gas at the top of the furnace, and the humidity of the gas at the top of the furnace.

[0136] In conjunction with the above embodiments, in another embodiment, the blast furnace reactor is equipped with multiple riser pipes, and at least one spray gun is installed at each riser pipe; step S3 further includes:

[0137] Step S34: Obtain the temperature of the blast furnace gas inside each of the riser pipes;

[0138] A blast furnace reactor typically has four riser pipes at its four corners, each corresponding to a different number of spray guns. The temperature inside each riser pipe is monitored in real time using sensors and other equipment.

[0139] Step S35: Based on the relationship between the temperatures inside the multiple pipes, determine the spray position for this coolant spraying from among the multiple spray guns;

[0140] Actual measurements show that the blast furnace gas from the same blast furnace exhibits varying temperatures within different riser pipes, with the highest-temperature riser pipe differing from the lowest-temperature riser pipe by up to 15%. Since the spray lances are distributed around the furnace top area, each with a defined spray position, analyzing the temperature within each riser pipe allows for the activation of the spray lances near the hottest riser pipes. This ensures that the coolant sprayed by the lances can contact and vaporize the blast furnace gas in the hottest riser pipe in the shortest possible time, achieving targeted cooling of the blast furnace gas.

[0141] Assume there are four riser pipes, A, B, C, and D, each corresponding to a different temperature zone. Real-time monitoring shows that riser pipe A has the highest temperature, followed by riser pipe B, then riser pipe C, and finally riser pipe D has the lowest temperature. The system will prioritize activating the spray gun located near riser pipe A, using this gun to inject coolant into the top region of the blast furnace reactor.

[0142] Specifically, step S35 may include:

[0143] Step S351: Obtain the pipe position of each riser pipe and the spray position of each spray gun;

[0144] Step S352: Obtain the number of spray guns used for this coolant spraying operation;

[0145] Step S353: Based on the relationship between the multiple pipe temperatures from highest to lowest and the number of spray guns, determine the spray positions that have a positional pairing relationship with the target pipe position one by one; wherein, the target pipe position is characterized as the pipe position corresponding to at least one of the riser pipes with higher temperature.

[0146] Specifically, multiple spray guns are distributed around the furnace top area, typically near the four riser pipes in that area. Each spray gun has a defined spray position, and each riser pipe has a corresponding pipe position. Therefore, each riser pipe corresponds to both adjacent and opposite spray guns. In this embodiment, the position pairing relationship can express that the spray position of a spray gun is adjacent to the pipe position of the riser pipe, or it can express that the spray positions of multiple spray guns are respectively adjacent to and opposite to the pipe positions of the riser pipes.

[0147] Based on the above embodiments, when other operating parameters are the same, different spraying conditions can be executed by presetting the number of spray guns. As described above, firstly, the number of spray guns required for this cooling operation is determined by the target temperature range. Then, for the target pipe location, the spraying positions of the target number of spray guns are determined, i.e., the spraying positions of the spray guns adjacent to and / or opposite to the target pipe location. Within the range of the number of spray guns to be activated, spray guns located near the pipe location of the higher-temperature riser pipe are prioritized for activation until all spray guns performing coolant spraying have been activated.

[0148] Assume there are four riser pipes A, B, C, and D, corresponding to four different pipe positions, and each spray gun corresponds to a spray position. The system uses real-time monitoring of the riser pipe's internal temperature, ranked from highest to lowest, for riser pipes A, B, C, and D. Therefore, when one spray gun needs to be activated, the spray gun adjacent to the pipe position of riser pipe A is activated; when two spray guns need to be activated, the spray guns adjacent to and opposite the pipe position of riser pipe A are activated to achieve uniform spraying; when three spray guns need to be activated, the spray guns adjacent to and opposite the pipe position of riser pipe A are activated first, then the spray gun adjacent to the pipe position of riser pipe B is activated, and so on.

[0149] In this way, the system can selectively perform cooling operations based on the specific pipe and spray gun locations to cope with the temperature differences in different areas of the blast furnace gas.

[0150] Step S36: According to the respective spray positions of the multiple spray guns, control at least one of the spray guns to spray the coolant at the determined target spray position.

[0151] Based on the determined target injection position, the spray guns, which are related to the pipe position of the high-temperature riser, spray coolant to achieve precise cooling of the blast furnace gas in the high-temperature area. In this way, the system can achieve targeted cooling and improve the accuracy of overall furnace top temperature control.

[0152] In some embodiments, other operating parameters of the corresponding spray gun can be adjusted according to the determined target spray position, such as spray flow rate, spray pressure, spray angle, and spray particle size.

[0153] It is understandable that when there are 8 spray guns and 4 riser pipes, each riser pipe corresponds to 2 spray guns.

[0154] In conjunction with the above embodiments, in another embodiment, the blast furnace gas can be pre-cooled. When the blast furnace top temperature exceeds 180°C, the top temperature is first lowered by reducing airflow or pressing down the material. If this fails to control the temperature, the spray gun is then activated to spray coolant. When implementing the method of this application, step S2 includes:

[0155] Step S21: Based on the current average temperature, reduce the current average temperature through a pretreatment step; the pretreatment step includes a furnace top air reduction step or a material pressing step;

[0156] Step S22: When the current average temperature after the drop is lower than the preset injection temperature, the injection request is not triggered; when the current average temperature after the drop is higher than the preset injection temperature, the injection request is triggered.

[0157] Furthermore, step S33 is followed by:

[0158] Step S5: Obtain the real-time average temperature of the cooled blast furnace gas;

[0159] Step S6: Based on different calibration temperature ranges, obtain the real-time target temperature range containing the real-time average temperature;

[0160] Step S7: Based on the real-time target temperature range, control the spray gun to switch to operate with the preset working parameters corresponding to the real-time target temperature range.

[0161] Specifically, after the cooling operation is completed, the real-time average temperature of the blast furnace gas is acquired in real time through sensors or monitoring equipment to provide real-time temperature data for subsequent adjustments. Based on different preset calibration temperature ranges and the real-time average temperature acquired, a real-time target temperature range including the actual average temperature is determined. According to the real-time target temperature range, the corresponding preset working parameters are selected, and the working mode of the spray gun is adjusted.

[0162] It should be noted that the specific principles of steps S5-S7 can be found in steps S31-S33.

[0163] For example, in conjunction with the above embodiments, if T is 700℃, 8 spray guns are started. During the water spraying process, if the temperature drops to 500℃-600℃, 2 spray guns are turned off. 6 spray guns are started. If the temperature drops to 400℃-500℃, 2 spray guns are turned off again, and so on. This avoids excessive water spraying, which not only wastes water resources but also prevents the gas humidity from increasing due to excessive water volume. In severe cases, this can lead to ash accumulation in the gravity dust collector, blockage of gas pipelines, and clogging of filter bags.

[0164] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of this application.

[0165] Based on the same inventive concept, such as Figure 2 The diagram shows a structural block diagram of a furnace top water spraying system. One embodiment of this application provides a furnace top water spraying system, which includes multiple spray guns for spraying coolant into the furnace top region of the blast furnace reactor to reduce the temperature of the blast furnace gas within the reactor. The system also includes:

[0166] The acquisition module 101 is used to acquire the current average temperature of the blast furnace gas in the target area;

[0167] The trigger judgment module 102 is used to determine whether to trigger a spray request based on the current average temperature and the preset spray start temperature;

[0168] The trigger control module 103 is used to respond to the currently triggered spray request and control the spray gun to spray the coolant according to the current average temperature and multiple calibrated temperature ranges.

[0169] The gas purification module 104 is used to determine that when the average temperature of the cooled blast furnace gas is less than the preset stop temperature, stop the spraying of the spray gun and output the blast furnace gas containing the ammonium chloride.

[0170] The preset shutdown temperature is characterized as the crystallization temperature of ammonium chloride produced by the reaction of ammonia and hydrogen chloride in the blast furnace gas.

[0171] In one feasible implementation, the trigger control module 103 includes:

[0172] The calibration module is used to set different calibration temperature ranges for the blast furnace gas and establish preset working parameters corresponding to each calibration temperature range.

[0173] A matching module is used to match the current average temperature with a target temperature range, wherein the target temperature range is characterized as a calibrated temperature range that includes the current average temperature.

[0174] The control module is used to control the spray gun to spray the coolant according to the preset working parameters corresponding to the target temperature range, based on the target temperature range.

[0175] In one feasible embodiment, the blast furnace reactor is configured with multiple riser pipes, each riser pipe having at least one spray gun; wherein the trigger control module 103 further includes:

[0176] The acquisition submodule is used to acquire the temperature inside the blast furnace gas in each of the riser pipes;

[0177] The determining module is used to determine the injection position of the coolant injection to be performed from the multiple spray guns based on the magnitude relationship between the multiple tube temperatures;

[0178] An execution module is used to control at least one of the spray guns to spray the coolant at a determined target spray position according to the spray positions corresponding to each of the multiple spray guns.

[0179] In one feasible solution, the determining module includes:

[0180] A position acquisition unit is used to acquire the pipe position of each of the riser pipes and the spray position of each of the spray guns;

[0181] The quantity acquisition unit is used to acquire the number of spray guns performing coolant spraying in this operation.

[0182] The determination submodule is used to determine the spray positions that have a positional pairing relationship with the target pipe position one by one, based on the relationship between the multiple pipe internal temperatures from large to small and the number of spray guns.

[0183] The target pipe location is characterized as the pipe location corresponding to at least one of the riser pipes with high temperature.

[0184] In one feasible embodiment, the blast furnace gas purification system includes a front-end dust removal system and a back-end desulfurization system, wherein the front-end dust removal system includes at least a bag filter; and the acquisition module 101 includes:

[0185] The first acquisition module 101 is used to acquire the current average temperature of the blast furnace gas in the top region of the blast furnace reactor; or,

[0186] The second acquisition module 101 is used to acquire the current average temperature of the blast furnace gas in the inlet area of ​​the bag filter.

[0187] In one feasible solution, the trigger determination module 102 includes:

[0188] A pretreatment module is used to reduce the current average temperature based on the current average temperature through pretreatment steps; the pretreatment steps include a furnace top air reduction step or a material pressing step;

[0189] The determination module is used to avoid triggering the injection request when the current average temperature after the temperature drop is lower than the preset injection temperature; and to trigger the injection request when the current average temperature after the temperature drop is higher than the preset injection temperature.

[0190] In one feasible embodiment, the furnace top water pumping system further includes:

[0191] The first real-time acquisition unit is used to acquire the real-time average temperature of the cooled blast furnace gas.

[0192] The second real-time acquisition unit is used to acquire a real-time target temperature range containing the real-time average temperature based on different calibration temperature ranges.

[0193] The real-time control module is used to control the spray gun to switch to the preset working parameters corresponding to the real-time target temperature range, based on the real-time target temperature range.

[0194] As the device embodiment is basically similar to the method embodiment, the description is relatively simple, and relevant parts can be found in the description of the method embodiment.

[0195] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0196] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0197] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0198] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0199] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0200] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0201] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0202] The above provides a detailed description of the blast furnace gas purification and control method and the furnace top water pumping system. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for purifying and controlling blast furnace gas, applied to a top water spraying system, the top water spraying system comprising multiple spray guns, the spray guns being used to spray coolant into the top region of the blast furnace reactor to reduce the temperature of the blast furnace gas within the blast furnace reactor; characterized in that, The method includes: Obtain the current average temperature of the blast furnace gas within the target area; If the current average temperature is greater than the preset injection start temperature, an injection request is triggered. In response to the currently triggered spray request, the spray gun is controlled to spray the coolant according to preset operating parameters based on the current average temperature and multiple calibrated temperature ranges; When the average temperature of the cooled blast furnace gas is lower than the preset stop temperature, the spraying of the spray gun is stopped, and the blast furnace gas containing ammonium chloride is output. The preset stop-spray temperature is characterized as the crystallization temperature of ammonium chloride generated by the reaction of ammonia and hydrogen chloride in the blast furnace gas. The preset spraying temperature is defined as the temperature at which the decomposition rate of ammonium chloride is greater than the formation rate of ammonium chloride.

2. The blast furnace gas purification and control method according to claim 1, characterized in that, In response to a currently triggered spray request, the method of controlling the spray gun to spray the coolant according to preset operating parameters based on the current average temperature and multiple calibrated temperature ranges includes: Set different calibration temperature ranges for the blast furnace gas, and establish preset operating parameters corresponding to each calibration temperature range; Match the current average temperature with the target temperature range, wherein the target temperature range is characterized as a calibrated temperature range that includes the current average temperature; Based on the target temperature range, the spray gun is controlled to spray the coolant according to the preset operating parameters corresponding to the target temperature range.

3. The blast furnace gas purification and control method according to claim 1, characterized in that, The blast furnace reactor is equipped with multiple riser pipes, and at least one spray gun is installed at each riser pipe; wherein, the step of controlling the spray gun to spray the coolant according to preset operating parameters in response to a currently triggered injection request, based on the current average temperature and multiple calibrated temperature ranges, further includes: The temperature of the blast furnace gas inside each of the riser pipes is obtained. Based on the relationship between the temperatures inside the multiple pipes, the spray position for this coolant spraying is determined from the multiple spray guns; According to the respective spray positions of the multiple spray guns, at least one of the spray guns is controlled to spray the coolant at the determined target spray position.

4. The blast furnace gas purification and control method according to claim 3, characterized in that, The step of determining the spray position for this coolant spraying operation from among the multiple spray guns based on the magnitude relationship between the temperatures inside the multiple pipes includes: Obtain the pipe position of each riser pipe and the spray position of each spray gun; Get the number of spray guns that perform coolant spraying this time; Based on the relationship between the multiple pipe temperatures from highest to lowest, and based on the number of spray guns, the spray positions that have a positional pairing relationship with the target pipe position are determined one by one; The target pipe location is characterized as the pipe location corresponding to at least one of the riser pipes with high temperature.

5. A method for purifying and controlling blast furnace gas according to any one of claims 1-4, characterized in that, The preset operating parameters include at least one of the following: number of spray guns, spray flow rate, spray pressure, spray angle, and spray particle size.

6. The blast furnace gas purification and control method according to claim 1, characterized in that, The blast furnace gas purification system includes a front-end dust removal system and a back-end desulfurization system. The front-end dust removal system includes at least a bag filter. The step of obtaining the current average temperature of the blast furnace gas within the target area includes: Obtain the current average temperature of the blast furnace gas in the top region of the blast furnace reactor; or, Obtain the current average temperature of the blast furnace gas in the inlet area of ​​the bag filter.

7. The blast furnace gas purification and control method according to claim 6, characterized in that, When the target area is the furnace top area, the preset stop spray temperature is 130℃-200℃; when the target area is the inlet area of ​​the bag filter, the preset stop spray temperature is 110℃-150℃.

8. The blast furnace gas purification and control method according to claim 1, characterized in that, The process of obtaining the current average temperature of the blast furnace gas within the target area then includes: Based on the current average temperature, the current average temperature is reduced through a pretreatment step; the pretreatment step includes a furnace top air reduction step or a material pressing step. When the current average temperature after the drop is lower than the preset injection start temperature, the injection request is not triggered; The step of triggering a spray request when the current average temperature is greater than the preset spray start temperature includes: The injection request is triggered when the current average temperature after the temperature drop is higher than the preset injection start temperature.

9. The blast furnace gas purification and control method according to claim 2, characterized in that, Based on the target temperature range, controlling the spray gun to spray the coolant according to the preset operating parameters corresponding to the target temperature range, then includes: Obtain the real-time average temperature of the cooled blast furnace gas; Based on different calibration temperature ranges, obtain the real-time target temperature range containing the real-time average temperature; Based on the real-time target temperature range, the spray gun is controlled to switch to operate with the preset working parameters corresponding to the real-time target temperature range.

10. A furnace top water spraying system, the furnace top water spraying system comprising a plurality of spray guns, the spray guns being used to spray coolant into the furnace top region of a blast furnace reactor to reduce the temperature of blast furnace gas within the blast furnace reactor; characterized in that, The system also includes: The acquisition module is used to acquire the current average temperature of the blast furnace gas within the target area; The triggering judgment module is used to trigger a spraying request when the current average temperature is greater than the preset spraying temperature. The trigger control module is used to respond to the currently triggered spray request and control the spray gun to spray the coolant according to the preset working parameters based on the current average temperature and multiple calibrated temperature ranges. The gas purification module is used to determine when the average temperature of the cooled blast furnace gas is lower than the preset stop temperature, stop the spraying of the spray gun, and output the blast furnace gas containing ammonium chloride. The preset stop-spray temperature is characterized as the crystallization temperature of ammonium chloride generated by the reaction of ammonia and hydrogen chloride in the blast furnace gas. The preset spraying temperature is defined as the temperature at which the decomposition rate of ammonium chloride is greater than the formation rate of ammonium chloride.

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