An air compressor system

Abstract

The utility model discloses a kind of air compressor systems, belong to blast furnace technical field, comprising: temperature detector, it is set on the blast furnace inner wall, and the temperature measuring one end inserts blast furnace interior;Multiple air compressors, its working end is equipped with first pipeline, and is connected in parallel in second pipeline;Throttle valve, it is set on first pipeline;Heat exchange unit, it includes: shell, and its lower end is communicated with second pipeline;Inner shell, and its upper is equipped with through-hole;Hot gas pipe, it is worn into inner shell, subsequently sequentially worn out inner shell, shell and communicated waste gas treatment system;Central processing unit, its information input end is connected with temperature detector, and information output end is connected with throttle valve;It is based on temperature detector information, control throttle valve.The utility model can take the temperature change in blast furnace as sample, utilize central processing unit to predict the temperature change in blast furnace in future period, before the temperature change in blast furnace, send adjustment instruction to throttle valve, and the output power of air compressor is actively adjusted.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace technology, and in particular to an air compressor system. Background Technology

[0002] Ironmaking is a metallurgical process in which iron ore (such as hematite and magnetite) is mixed with coke and flux (limestone) in a blast furnace, and the iron oxides are reduced by carbon monoxide generated by the coke at a high temperature of 1500℃. At the same time, gangue is separated to form slag, and finally liquid pig iron with a carbon content of 2%-4.3% is produced for steelmaking or casting.

[0003] During ironmaking, air needs to be blown into the bottom of the blast furnace and injected into the furnace through the tuyeres. Modern processes also use oxygen-enriched blast or pulverized coal injection to reduce the coke ratio, increase smelting intensity, and control furnace stability. However, as the reaction of iron ore, coke, and slagging agents proceeds inside the blast furnace, the required amount of high-pressure gas blown in gradually changes. When the flow rate of high-pressure gas provided by multiple air compressors exceeds the actual need, resources are wasted; when the flow rate is less than the actual need, the reaction quality of iron ore, coke, and slagging agents inside the blast furnace cannot be guaranteed.

[0004] As mentioned above, existing air compressor systems for ironmaking have certain shortcomings: when multiple units are connected in parallel, there is a lack of intelligent scheduling, leading to a "large horse pulling a small cart" phenomenon. It is necessary to solve the energy consumption and reliability problems through dynamic load adjustment technology. Utility Model Content

[0005] To address the above issues and overcome the shortcomings of existing technologies, this invention provides an air compressor system. This invention comprises multiple air compressors, throttle valves, thermometers, and a central processing unit (CPU). In this system, the thermometers transmit the detected blast furnace temperature to the CPU in real time. The CPU employs a machine learning method using long short-term memory networks (LSTM) to predict future blast furnace temperature changes based on past temperatures. Subsequently, the CPU controls the opening degree of each throttle valve in real time based on the predicted temperature changes, thereby actively adjusting the power of the air compressors and achieving intelligent scheduling of multiple air compressors operating in parallel.

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

[0007] This utility model provides an air compressor system applied to blast furnace production. The blast furnace has an air inlet at the bottom for blowing air into its interior and an air outlet at the top for exhausting air from its exterior. The gas discharged from the blast furnace ultimately flows into a waste gas treatment system. The air compressor system includes:

[0008] A thermometer is installed on the inner wall of the blast furnace, with one end of the thermometer, which measures the temperature, inserted into the blast furnace.

[0009] Multiple air compressors, each with a first pipe at its working end, the first pipe being connected in parallel to a second pipe;

[0010] A throttle valve, wherein the throttle valve is disposed on the first pipe;

[0011] Heat exchange unit; the heat exchange unit includes:

[0012] The outer casing, the lower end of which is connected to the second pipe;

[0013] An inner shell is inserted into and sealed to the outer shell; the inner shell has a through hole.

[0014] A hot air pipe, which is connected to the exhaust port, passes through the inner shell, and then passes through the inner shell and outer shell in sequence and is connected to the waste gas treatment system.

[0015] A central processing unit (CPU) is provided, with its input terminal connected to the thermometer and its output terminal connected to the throttling valve. The CPU controls the throttling function of the throttling valve based on the temperature information provided by the thermometer.

[0016] Furthermore, the number of air compressors is at least four; each air compressor is independently connected to the throttle valve at its working end, and the working states of the multiple throttle valves are independent.

[0017] Furthermore, the air compressor includes at least two types of exhaust power.

[0018] Furthermore, it also includes a one-way valve, which is disposed on the first pipe of the air compressor.

[0019] Furthermore, an alarm is also connected to the signal output terminal of the central processing unit.

[0020] Furthermore, after the input end of the hot gas pipe of the heat exchange unit, which is connected to the gas outlet of the blast furnace, is inserted into the inner shell, it is connected to an exchange section, which extends in a spring-like, spiral shape; the other end of the exchange section is connected to an output end, which passes through the inner shell and the outer shell in sequence and is connected to the waste gas treatment system.

[0021] Furthermore, the outer shell of the heat exchange unit includes a cylindrical portion and a frustum portion, the cylindrical portion and the larger diameter end of the frustum portion are connected; the inner shell extends into the outer shell from the smaller diameter end of the frustum portion and is sealed to the frustum portion; the end of the inner shell inserted into the outer shell is closed.

[0022] This utility model has at least the following advantages or beneficial effects:

[0023] The air compressor system provided by this utility model can use the temperature changes inside the blast furnace as a sample and perform machine learning using a central processing unit to predict the temperature change trend inside the blast furnace over a period of time. Thus, before the temperature inside the blast furnace changes, adjustment commands are issued to the throttle valves at the end of each air compressor to actively adjust the output power of the air compressor.

[0024] More specifically, existing technologies adjust the compressor's output power based on the gas pressure emitted by the air compressor, which is a process-oriented approach. This embodiment, however, adjusts the air compressor's exhaust power in a result-oriented manner; that is, this invention directly adjusts the flow rate based on predicted temperature requirements (result-oriented), while existing technologies only respond to real-time pressure changes (process-oriented). Therefore, in industrial applications, this embodiment can more reliably and intelligently ensure the amount of air blown in for ironmaking. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments 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.

[0026] Figure 1 This is a schematic diagram of an air compressor system;

[0027] Figure 2 This is a schematic diagram of the heat exchange unit structure;

[0028] Figure 3 This is a flowchart illustrating how the central processing unit adjusts the throttle valve based on the temperature feedback from the thermometer and the predicted temperature change trend inside the blast furnace over a future period.

[0029] Figure label:

[0030] 1-Blast furnace; 11-Air inlet; 12-Air outlet; 13-Waste gas treatment system;

[0031] 2-Thermometer;

[0032] 3-Air compressor; 31-First pipe; 32-Second pipe;

[0033] 4-Throttle valve;

[0034] 5-Heat exchange unit; 51-Outer shell; 52-Inner shell; 521-Through hole; 53-Hot air pipe; 531-Input end; 532-Exchange section; 533-Output end;

[0035] 6-Central processing unit; 7-One-way valve; 8-Alarm; Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship of the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limiting this utility model.

[0040] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0041] The embodiments of this utility model will be described in detail below.

[0042] This utility model discloses an air compressor system, the details of which are as follows:

[0043] Figure 1This is a schematic diagram of the air compressor system in this embodiment. As can be seen from the diagram, the air compressor system in this embodiment is mainly used in the production of blast furnace 1. The blast furnace 1 has an air inlet 11 at its lower part for blowing air into its interior and an air outlet 12 at its upper part for exhausting gas into the exterior. The gas discharged from the blast furnace 1 ultimately flows into the waste gas treatment system 13. The air compressor system in this embodiment mainly includes the following six parts:

[0044] Temperature sensor 2 is fixed to the inner wall of blast furnace 1, with one end inserted into the blast furnace to measure temperature, enabling real-time monitoring of temperature changes within the blast furnace. Both the temperature sensor 2 and its usage method are existing technologies.

[0045] Air compressor 3 is a machine that compresses atmospheric air into high-pressure gas that is ultimately blown into blast furnace 1. The air compressor 3 blows high-pressure gas into blast furnace 1, promoting the chemical reaction of iron ore, coke, and slagging agents within the blast furnace 1. This embodiment includes four air compressors 3, with two different exhaust power ratings. Each air compressor 3 is connected to a first pipe 31, and each first pipe 31 is connected in parallel to a second pipe 32. Furthermore, the operating state of each air compressor 3 can be adjusted individually.

[0046] Throttling valve 4 is a valve that can receive electrical signals and adjust the throttling function; throttling valve 4 is installed on the first pipe 31 of air compressor 3. A one-way valve 7 is also installed on the first pipe 31.

[0047] The heat exchange unit 5 has a double-layer structure. The lower end of the outer shell 51 is sealed to the second pipe 32. The lower end of the inner shell 52 is inserted into the outer shell 51, and the side wall of the inner shell 52 is sealed to the outer shell 51. The upper end of the inner shell 52 is connected to the air inlet 11 of the blast furnace 1. The heat exchange unit 5 also includes a hot gas pipe 53, which is connected to the exhaust port 12 of the blast furnace 1, passes through the inner shell 52, and then passes through the inner shell 52 and the outer shell 51 in sequence, and is connected to the waste gas treatment system 13.

[0048] Specifically, Figure 2 A schematic diagram of the heat exchange unit 5 is shown. As can be seen from the diagram, the heat exchange unit 5 mainly consists of the following three parts:

[0049] The outer casing 51 is composed of a cylindrical portion 511 and a frustum-shaped portion 512. The lower end of the cylindrical portion 511 receives ambient temperature gas and, in this embodiment, is connected to the second pipe 32 of the air compressor 3. The upper end of the cylindrical portion 511 is sealed to the lower end of the frustum-shaped portion 512. The lower end of the frustum-shaped portion 512 has a larger diameter than its upper end; the upper end of the frustum-shaped portion 512 is sealed to the side wall of the inner casing 52.

[0050] The inner shell 52 is inserted into the outer shell 51 from the upper end of the frustum portion 512. The inner shell 52, which is enclosed by the outer shell 51, has multiple through holes 521 on its side. The lower end of the inner shell 52 is closed. Heated gas exits from the upper end of the inner shell 52 and is connected to the gas inlet 11 of the blast furnace 1.

[0051] A hot gas pipe 53 has an upstream inlet 531 connected to the outlet 12 of the blast furnace 1. After the inlet 531 is inserted into the inner shell 52, it is connected to an exchange section 532. The exchange section 532 is spring-shaped and spirally extends downward. The lower end of the exchange section 532 is connected to an outlet 533, which passes through the inner shell 52 and the outer shell 51 in sequence, and finally connects to the waste gas treatment system 13.

[0052] In this way, the high-temperature gas discharged from the outlet of blast furnace 1 enters through the inlet 531 of the hot gas pipe 53 of the heat exchange unit 5, then flows along the exchange section 532, and finally leaves the heat exchange unit 5 from the outlet 533, eventually entering the waste gas treatment system 13. At the same time, the ambient temperature gas discharged from the air compressor 3 enters from the lower part of the outer shell 51 of the heat exchange unit 5, then enters the inner shell 52 through the through hole 521 on the side of the inner shell 52, and finally enters the air inlet 11 of blast furnace 1 from the upper end of the inner shell 52. During this process, the ambient temperature gas passes through the through hole 521 on the surface of the inner shell 52 and is sprayed onto the surface of the exchange section 532, thereby being heated by the high-temperature gas inside the exchange section 532, achieving the purpose of utilizing the waste heat of the exchange section 532.

[0053] Figure 1 The air compressor system in the system also includes:

[0054] The central processing unit 6 is an electronic device capable of receiving information input and sending information output, such as a computer in the market. The information input terminal of the central processing unit 6 is connected to the temperature sensor 2, which sends the monitored temperature of the blast furnace 1 to the central processing unit 6 in real time; the information output terminal of the central processing unit 6 is connected to the throttling valves 4, and the throttling degree of each throttling valve 4 is controlled by the central processing unit 6.

[0055] Alarm 8 is an audible and visual alarm that emits a red light and a buzzer when in operation, and is considered existing technology. The control terminal of alarm 8 is connected to the central processing unit 6. When the central processing unit 6 predicts that the temperature change over a future period will be higher or lower than a preset threshold, the central processing unit 6 immediately controls alarm 8 to issue an audible and visual alarm, thereby alerting personnel to intervene and verify the situation, thus improving system security.

[0056] The working relationship between the temperature sensor 2, the throttle valve 4, and the central processing unit 6 in this embodiment will be explained next.

[0057] First, the temperature sensor 2 provides real-time temperature information inside the blast furnace 1 to the central processing unit 6. Then, the central processing unit 6 processes the temperatures received at multiple different times over a past period using a long short-term memory (LSTM) method from machine learning to determine future temperature changes. Next, based on these future temperature changes, the central processing unit 6 calculates the required high-pressure air flow rate inside the blast furnace 1 for the future period. Finally, the central processing unit 6 controls the throttling degree of each throttling valve 4 to control the high-pressure air flow rate. Additionally, the central processing unit 5 prioritizes the use of the low-power air compressor 3, only activating the high-power unit when its power is insufficient.

[0058] The central processing unit 6 processes the temperature changes inside the blast furnace 1 fed back by the temperature sensor 2 using the long short-term memory method in machine learning. This method predicts future changes by fitting data trends and takes into account both long and short-term dependencies in dynamic adjustments.

[0059] Overall, combined Figure 3 The flowchart shown illustrates the workflow of the air compressor system in this embodiment:

[0060] S100: Preparations before ironmaking: Add raw materials such as iron ore, coke, and slagging agent into blast furnace 1;

[0061] S200: The thermometer 2 monitors the temperature inside the blast furnace 1 and transmits the data to the central processing unit 6;

[0062] S300: The central processing unit 6 performs machine learning on the temperature inside blast furnace 1 to predict the temperature change trend in the future, and at the same time calculates the required high-pressure air flow rate in the future.

[0063] S400: Determine whether the temperature change predicted in S300 over a future period is within the predetermined range: if yes, proceed directly to S500; if no, proceed directly to S1000.

[0064] S500: Based on the high-pressure air flow rate required in the future period calculated in S300, and combined with the current high-pressure air flow rate, determine whether the high-pressure air flow rate needs to be adjusted: if yes, proceed directly to S600; if no, proceed directly to S900.

[0065] S600: Determine whether to increase airflow: If yes, proceed directly to S700; if no, proceed directly to S800.

[0066] S700: Sends an increase flow command to each throttle valve 4 in sequence to increase the high-pressure air flow and directly enter S900;

[0067] S800: Sends a flow reduction command to each throttle valve 4 in sequence to reduce the high-pressure air flow;

[0068] S900: Determine whether to end the work: if yes, proceed directly to S1100; if no, proceed directly to S200.

[0069] S1000: Alarm 8 alarm, manual intervention required, proceed to S1100;

[0070] S1100: End the operation of this system.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An air compressor system applied to blast furnace (1) production, wherein the blast furnace (1) has an air inlet (11) at the lower part for blowing air into its interior and an air outlet (12) at the upper part for exhausting air into its exterior; the gas discharged from the blast furnace (1) is ultimately incorporated into a waste gas treatment system (13); characterized in that, The air compressor system includes: The thermometer (2) is installed on the inner wall of the blast furnace, and one end of the thermometer (2) that measures the temperature is inserted into the blast furnace (1). Multiple air compressors (3) are provided with a first pipe (31) at their working end, and the first pipe (31) is connected in parallel to a second pipe (32); A throttle valve (4) is provided on the first pipe (31); Heat exchange unit (5); the heat exchange unit (5) includes: The outer casing (51) has its lower end connected to the second pipe (32); Inner shell (52), which is inserted into outer shell (51) and sealed together; the inner shell (52) is provided with through hole (521); Hot air pipe (53), after being connected to the air outlet (12), is inserted into the inner shell (52), and then sequentially passes through the inner shell (52) and the outer shell (51) and is connected to the waste gas treatment system (13). The central processing unit (6) has its information input terminal connected to the thermometer (2) and its information output terminal connected to the throttle valve (4). The central processing unit (6) controls the throttling function of the throttle valve (4) based on the temperature information provided by the thermometer (2).

2. The air compressor system according to claim 1, characterized in that, The number of air compressors (3) is at least 4; each air compressor (3) is independently connected to the throttle valve (4) at its working end, and the working states of the multiple throttle valves (4) are independent.

3. The air compressor system according to claim 1, characterized in that, The air compressor (3) includes at least two types of exhaust power.

4. The air compressor system according to claim 1, characterized in that, It also includes a one-way valve (7), which is disposed on the first pipe (31) of the air compressor.

5. The air compressor system according to claim 1, characterized in that, An alarm (8) is also connected to the signal output terminal of the central processing unit (6).

6. The air compressor system according to claim 1, characterized in that, After the input end (531) of the hot gas pipe (53) of the heat exchange unit (5) is connected to the gas outlet (12) of the blast furnace (1) is inserted into the inner shell (52), it is connected to the exchange part (532). The exchange part (532) is spring-shaped and spirally extended. The other end of the exchange part (532) is connected to the output end (533). The output end (533) passes through the inner shell (52) and the outer shell (51) in sequence and is connected to the waste gas treatment system (13).

7. The air compressor system according to claim 1, characterized in that, The outer shell (51) of the heat exchange unit (5) includes a cylindrical part (511) and a frustum part (512). The cylindrical part (511) and the frustum part (512) are connected at the larger diameter end. The inner shell (52) extends into the outer shell (51) from the smaller diameter end of the frustum part (512) and is sealed to the frustum part (512). The end of the inner shell (52) inserted into the outer shell (51) is closed.

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