Energy-saving blast furnace blast system based on multi-heat source cooperation and low-resistance dehumidification

Abstract

The utility model provides a kind of based on multi-heat source cooperation and low resistance dehumidification's energy-saving blast furnace blast system, by adopting with the multiple heat source complementary supply mode of mainly slag flush steam, low resistance dehumidifier structure and the intelligent control strategy based on energy consumption prediction model, the precise regulation and control of blast furnace blast parameters and the dynamic optimization of system energy consumption are realized.The system has the characteristics of high heat source utilization rate, small equipment resistance, good running stability, significant energy-saving effect, etc., especially by real-time matching the best operating condition through intelligent algorithm, effectively reduces the power consumption of blower and smelting coke ratio, improves the blast furnace smoothness and production economy, while significantly reducing carbon dioxide emissions, providing reliable technical support for the green and low-carbon transformation of blast furnace ironmaking process.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace blasting technology, and in particular to an energy-saving blast furnace blasting system based on multi-heat source synergy and low-resistance dehumidification. Background Technology

[0002] Blast furnace smelting is one of the core processes in modern steel production. During this process, compressed air at a certain pressure (usually 0.3–0.6 MPa) must be continuously pumped into the blast furnace to maintain fuel combustion and reduction reactions. Under the "dual carbon" target (referring to carbon emissions from both the furnace and the blast furnace), the blast furnace process is a major contributor to energy consumption and carbon emissions in steel enterprises, making the energy-saving optimization of its blast furnace blast system a focus of industry attention. Parameters such as the temperature, humidity, and oxygen concentration of the blast air directly affect the coke ratio, coal ratio, power consumption, and furnace stability. In particular, changes in air humidity significantly exacerbate the endothermic reaction of moisture decomposition within the furnace, increasing fuel consumption and CO2 emissions. Therefore, blast furnace dehumidification blast technology has emerged, aiming to achieve energy conservation, emission reduction, and stable production by controlling the humidity of the air entering the furnace.

[0003] Currently, most blast furnace dehumidification technologies applied both domestically and internationally are based on refrigeration dehumidification. This involves installing a dehumidification device at the blower inlet, using a refrigeration unit to cool and condense the air for dehumidification. Common system structures include multi-stage surface coolers, steam lithium bromide refrigeration units, or electric screw refrigeration units. For example, existing technologies employ two-stage dehumidification heat exchangers, with different refrigeration units providing the cooling source to achieve step-by-step cooling and dehumidification of the air. While these technologies can reduce air humidity to some extent, their systems are complex, require large investments, and consume high energy. They also present several significant problems: First, they rely on a single heat source, primarily external steam or electricity, lacking effective utilization of the blast furnace's own waste heat (such as exhaust steam from slag flushing), resulting in low overall energy efficiency and susceptibility to system shutdowns when heat supply is unstable. Second, the internal flow channel design of the dehumidifying heat exchanger is unreasonable, with generally high air-side resistance (typically 550–800 Pa), significantly increasing the additional power consumption of the blower and weakening the overall energy-saving effect. Third, the system control method is simple, often using fixed setpoints or manual adjustments, making dynamic optimization based on seasonal changes and atmospheric parameter fluctuations impossible, hindering year-round high-efficiency energy-saving operation. Furthermore, direct entry of low-temperature saturated air into the blower easily causes blade condensation and corrosion, and winter operation requires additional anti-freezing protection, increasing system maintenance costs and safety risks.

[0004] In summary, existing blast furnace dehumidification blast technology has significant shortcomings in terms of heat source adaptability, equipment resistance, intelligent control, and system integration, resulting in its energy-saving potential not being fully realized and insufficient operational economy and stability. Therefore, there is an urgent need in this field to develop a blast furnace blast energy-saving system that can comprehensively utilize multiple heat sources, possess low-resistance and high-efficiency dehumidification capabilities, and achieve intelligent predictive control, in order to solve the problems of high energy consumption, poor adaptability, and control lag in existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides an energy-saving blast furnace blast system based on multi-heat source coordination and low-resistance dehumidification, comprising:

[0008] A multi-heat source supply unit, which is connected to the blast furnace, is used to provide the heat energy required for cooling, including the main heat source of blast furnace slag flushing exhaust steam, the auxiliary heat source of slag flushing water, and the auxiliary heat source of standby steam.

[0009] An air separation supply unit is connected to a blast furnace and is used to supply compressed air to the blast furnace. The air separation supply unit includes an air filter and a blower. An air duct is provided between the air filter and the blower, and a heat exchanger is provided in the air duct.

[0010] A refrigeration unit, which is connected to the multi-heat source supply unit and the heat exchanger, is used to refrigerate the air separation unit in the air duct.

[0011] A low-resistance dehumidifier is installed in the air duct between the air filter and the blower and is connected to a condensate collection device for dehumidifying the air in the air duct. The low-resistance dehumidifier adopts a flow channel optimization structure so that its air-side operating resistance is no more than 300Pa.

[0012] The intelligent control center is connected to the multi-heat source supply unit, the refrigeration unit and the low-resistance dehumidifier by signal. It is used to calculate the optimal set value based on the real-time collected environmental parameters and process data, and to regulate the coordinated operation of each module.

[0013] Preferably, the multi-heat source supply unit is connected to the heat medium inlet of the refrigeration unit via a pipeline, and the refrigerant outlet of the refrigeration unit is connected to the cold source inlet of the heat exchanger.

[0014] Preferably, the refrigeration unit is a lithium bromide refrigeration unit.

[0015] Preferably, the condensate collection device includes a condensate tank and a drain pipe, with the inlet of the drain pipe located at the bottom of the precooling section and the main cooling section of the low-resistance dehumidifier, respectively.

[0016] Preferably, the multi-heat source supply unit is equipped with a waste steam filter, and the air duct is also equipped with a demister.

[0017] Preferably, the intelligent control center includes:

[0018] The data acquisition unit is used to acquire atmospheric temperature, humidity, blower flow rate and unit power consumption parameters in real time;

[0019] The model prediction unit has a built-in energy consumption prediction model for the blast furnace blast system. This model is trained based on historical data and can predict the total energy consumption of the system under different set conditions.

[0020] The control execution unit is used to adjust the heat source switching valve, the operating frequency of the refrigeration unit, and the opening degree of the dehumidifier damper.

[0021] The present invention achieves the following beneficial technical effects compared to the prior art:

[0022] This invention provides an energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification. By employing a multi-heat source complementary supply method primarily using slag flushing exhaust steam, a low-resistance dehumidifier structure, and an intelligent control strategy based on an energy consumption prediction model, it achieves precise control of blast furnace blast parameters and dynamic optimization of system energy consumption. This system features high heat source utilization, low equipment resistance, good operational stability, and significant energy-saving effects. In particular, through intelligent algorithms that match optimal operating conditions in real time, it effectively reduces blower power consumption and smelting coke ratio, improves blast furnace smoothness and production economy, and significantly reduces carbon dioxide emissions, providing reliable technical support for the green and low-carbon transformation of the blast furnace ironmaking process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of the energy-saving blast furnace blower system based on multi-heat source synergy and low-resistance dehumidification provided by this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide an energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification, so as to solve the problems existing in the prior art.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1:

[0029] This embodiment provides an energy-saving blast furnace blast system based on multi-heat source coordination and low-resistance dehumidification, such as... Figure 1 As shown, it mainly includes a multi-heat source supply unit 2, an air separation supply unit, a refrigeration unit 6, a low-resistance dehumidifier 7, and an intelligent control center.

[0030] The multi-heat source supply unit 2 is connected to the slag flushing system of the blast furnace 3 via the exhaust steam filter 10, and is mainly used to recover and supply the heat energy required for refrigeration. This unit uses the exhaust steam generated during the blast furnace slag flushing process as the main heat source, and is equipped with a slag flushing water heat exchanger and a backup steam generator as auxiliary heat sources, forming a multi-source complementary heat energy supply pattern. This ensures stable operation of the system under different operating conditions and avoids system shutdown due to the interruption of a single heat source. The multi-heat source supply unit 2 is connected to the heat medium inlet of the refrigeration unit 6 via an insulated pipe, transferring heat energy to the refrigeration unit 6 for energy supply.

[0031] Furthermore, the air separation supply unit is responsible for supplying compressed air that meets the process requirements to blast furnace 3, including an air filter 1, a low-resistance dehumidifier 7, and a blower 8 connected in sequence. The air filter 1 is used to remove dust particles from the atmosphere, and the purified air enters the air duct 4. The air duct 4 is equipped with a low-resistance dehumidifier 7, which adopts a unique flow channel design. By optimizing the air flow path, it significantly reduces the air-side flow resistance to below 300Pa while ensuring efficient heat exchange (heat exchange efficiency not less than 85%), which is far lower than the resistance level of 550-800Pa of traditional dehumidifiers, thereby effectively reducing the additional power consumption of the blower 8. The condensate outlets at the bottom of the precooling section and the main cooling section of the low-resistance dehumidifier 7 are connected to the condensate tank of the condensate collection device 5 through drainage pipes to promptly remove the precipitated condensate.

[0032] Furthermore, the refrigeration unit 6 employs a lithium bromide absorption chiller, whose driving heat source comes from the slag flushing exhaust steam or standby steam provided by the multi-heat source supply unit 2. The refrigerant outlet of the refrigeration unit 6 is connected to the cold source inlet of the heat exchanger 9 via a pipeline, supplying low-temperature chilled water to the heat exchanger to cool the air. The selection of the refrigeration unit 6 fully considers its adaptability to low-grade heat sources, improving the overall energy utilization efficiency of the system.

[0033] Furthermore, a demister 11 is also provided on the air duct 4 for demisting the air.

[0034] Furthermore, the intelligent control center, as the core decision-making unit of the system, is connected to the multi-heat source supply unit 2, the refrigeration unit 6, the low-resistance dehumidifier 7, and the sensor network arranged in the air duct 4 and at various key nodes. The intelligent control center has built-in data acquisition units, model prediction units, and control execution units. The data acquisition unit collects atmospheric temperature, relative humidity, airflow, and power consumption parameters of various parts of the system in real time.

[0035] The model prediction unit integrates an energy consumption prediction model for the blast furnace blast system. This model is trained and built based on historical operating data, and its core expression is:

[0036] P total =P fan (T set H set ,F)+P ref (Q cool )+P aux ;

[0037] Among them, P fan T is the power function of the blower. set and H set These are the target temperature and humidity setpoints, respectively; F is the blower air flow rate; P... ref Q represents the power consumption for cooling. cool For the required cooling capacity, P aux Power consumption for auxiliary equipment.

[0038] The model prediction unit employs a particle swarm optimization algorithm to minimize P. total With the objective of satisfying the upper limit constraint H, set ≤H max and temperature range constraint T min ≤T set ≤T max Under the premise of [condition], dynamically search for the optimal target temperature and target humidity.

[0039] The control execution unit automatically adjusts the heat source switching valve of the multi-heat source supply unit 2, the operating frequency of the refrigeration unit 6, and the opening of the regulating damper of the low-resistance dehumidifier 7 based on the optimization results, so as to achieve precise control of the system operation.

[0040] In addition, the intelligent control center is equipped with a seasonal mode switching module, which can automatically select the operating strategy according to external weather conditions. For example, in the hot and humid environment of summer, the system prioritizes the deep dehumidification mode to strictly control the moisture content of the air entering the furnace; in the relatively low humidity seasons of spring and autumn, it switches to the cooling and densification mode, which increases density by lowering the air temperature, thereby increasing the mass flow rate of the blower at the same volume flow rate and reducing the power consumption of the blower.

[0041] The working process of this utility model system is as follows: Ambient air is first purified by air filter 1, then enters heat exchanger 9 for heat exchange, and then enters low-resistivity dehumidifier 7, where moisture is released from the air, achieving dehumidification. The dehumidified, low-temperature dry air then enters blower 8, is pressurized, and sent to blast furnace 3 to participate in the smelting reaction. The intelligent control center monitors the system's operating status throughout the process, and optimizes control parameters in real time through an energy consumption prediction model to ensure that the system always operates near the optimal energy efficiency point. The condensate generated by the system is collected and treated uniformly by condensate collection device 5.

[0042] This invention has been integrated and debugged at Hebei Puyang Steel Plant and has entered the trial operation stage. Actual operating data shows that the system can stably control the humidity content of the air entering the furnace during summer at 8-10 g / m³. 3 In spring and autumn, the blast temperature can be reduced to 10-15℃, and the air density can be increased by about 5%. According to preliminary calculations, the system can reduce the power consumption of the blower by 7-10%, decrease the overall coke ratio, and reduce carbon dioxide emissions by about 11,150 tons per year. The economic and environmental benefits are significant, providing an effective technical solution for energy conservation and carbon reduction in the blast furnace ironmaking process.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] It should be noted that the components mentioned in the above embodiments are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0045] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. 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 idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification, characterized in that, include: A multi-heat source supply unit (2) is connected to the blast furnace (3) and is used to provide the heat energy required for cooling, including the main heat source of the blast furnace (3) slag flushing exhaust steam, the auxiliary heat source of the slag flushing water and the auxiliary heat source of the standby steam. An air separation supply unit is connected to a blast furnace (3) and is used to supply compressed air to the blast furnace (3). It includes an air filter (1) and a blower (8). A duct (4) is provided between the air filter (1) and the blower (8). A heat exchanger (9) is provided in the duct (4). A refrigeration unit (6) is connected to the multi-heat source supply unit (2) and the heat exchanger (9) for refrigerating the air separation unit in the air duct (4). Low-resistance dehumidifier (7) is installed in the air duct (4) between the air filter (1) and the blower (8) and is connected to the condensate collection device (5) for dehumidifying the air in the air duct (4). The low-resistance dehumidifier (7) adopts a flow channel optimization structure so that its air-side operating resistance is no more than 300Pa. The intelligent control center is connected to the multi-heat source supply unit (2), the refrigeration unit (6) and the low-resistance dehumidifier (7) by signal. It is used to calculate the optimal set value based on the environmental parameters and process data collected in real time, through the built-in energy consumption prediction model, and to regulate the coordinated operation of each module.

2. The energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification as described in claim 1, characterized in that, The multi-heat source supply unit (2) is connected to the heat medium inlet of the refrigeration unit (6) through a pipeline, and the refrigerant outlet of the refrigeration unit (6) is connected to the cold source inlet of the heat exchanger (9).

3. The energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification as described in claim 1, characterized in that, The refrigeration unit (6) is a lithium bromide refrigeration unit.

4. The energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification as described in claim 1, characterized in that, The condensate collection device (5) includes a condensate tank and a drain pipe. The inlet of the drain pipe is located at the bottom of the precooling section and the main cooling section of the low-resistance dehumidifier (7).

5. The energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification as described in claim 1, characterized in that, The multi-heat source supply unit (2) is equipped with a waste steam filter (10), and the air duct (4) is also equipped with a demister (11).

6. The energy-saving blast furnace blast system based on multi-heat source synergy and low-resistance dehumidification as described in claim 1, characterized in that, The intelligent control center includes: The data acquisition unit is used to acquire atmospheric temperature, humidity, blower flow rate and unit power consumption parameters in real time; The model prediction unit has a built-in energy consumption prediction model for the blast furnace blast system. This model is trained based on historical data and can predict the total energy consumption of the system under different set conditions. The control execution unit is used to adjust the heat source switching valve, the operating frequency of the refrigeration unit, and the opening degree of the dehumidifier damper.

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