A method and system for dynamic adjustment of cooling water profile for securing the bosh operation of a blast furnace

Abstract

The present application relates to a kind of cooling water dynamic adjustment method of stabilizing blast furnace bosh operation inner profile, belong to blast furnace ironmaking technical field, comprising the following steps: collecting N bosh cooling wall working temperature when blast furnace condition is good;N temperature values are handled using bosh cooling wall temperature monitoring model, and target temperature Tset is calculated;Using slag skin thickness prediction model, real-time acquisition bosh cooling wall temperature, according to the relationship between real-time temperature and target temperature Tset, judge the change trend of slag skin thickness;Cooling water flow dynamic control model, according to the change trend of slag skin thickness, dynamically control cooling water flow.A kind of cooling water dynamic adjustment system of stabilizing blast furnace bosh operation inner profile is also designed.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace ironmaking technology and relates to a method and system for dynamically adjusting cooling water to stabilize the internal shape of the blast furnace belly. Background Technology

[0002] The blast furnace is the world's largest high-temperature metallurgical gas-solid countercurrent single reactor, undergoing complex and varied physicochemical changes. Its structure, from top to bottom, is divided into the throat, body, waist, belly, and hearth, primarily composed of refractory materials, cooling equipment, and the furnace shell. Located in the upper part of the hearth, the tuyeres swirling zone introduces high-speed hot air (>1200℃) through small tuyeres, which reacts with coke to produce high-temperature metallurgical gas, providing heat and gaseous reducing agents for the reduction reaction of iron ore inside the blast furnace. This high-heat-load zone experiences drastic changes in temperature field and airflow distribution, high heat flux intensity, and complex and harsh operating conditions, directly impacting the safe production of the blast furnace. Currently, the furnace walls in the high-heat-load zone are mainly protected by water cooling equipment to condense slag, establishing a heat transfer system of "slag skin → cooling wall → cooling water." However, in actual production, the slag skin is unstable at its base and frequently detaches, exhibiting a non-fixed cyclical pattern of "condensation → detachment → condensation." The main reason for the frequent fluctuations in slag thickness mentioned above is the unreasonable control of cooling intensity. When the cooling intensity is too high, local thickening is likely to occur, and the slag skin is unstable and prone to frequent falling off; when the cooling intensity is too low, the generated slag skin is thin, which is detrimental to the lifespan of the cooling equipment. Therefore, controlling the cooling intensity in high heat load areas at a reasonable level and ensuring the long-term stable operation of the slag skin in these areas is crucial for the safe operation of cooling equipment in high heat load areas.

[0003] Currently, the industry mainly focuses on enhancing cooling intensity in high heat load areas. For example, patent 202311042160.8 discloses a method of inserting a cooling element between the furnace belly cooling wall and the tuyeres cooling wall to enhance the cooling intensity in the furnace belly area. However, this technical solution is limited to statically enhancing cooling intensity, thereby increasing slag thickness. It does not address how to reduce cooling intensity after the slag thickens due to enhanced cooling intensity in this area, nor does it address the dynamic control of slag thickness changes and cooling intensity. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and system for dynamic adjustment of cooling water in order to stabilize the internal operating conditions of a blast furnace belly.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] Collect the working temperatures of N furnace belly cooling walls during a stable period when the furnace condition is good.

[0007] The target temperature Tset is calculated by processing the N temperature data using a furnace belly cooling wall temperature monitoring model.

[0008] Using a slag thickness prediction model, the temperature of the furnace belly cooling wall is collected in real time. Based on the deviation between the real-time temperature and the target temperature Tset and the relationship between the temperature change rate, the trend of slag thickness variation is determined.

[0009] A dynamic control model for cooling water flow rate is used to dynamically control the cooling water flow rate based on the changing trend of slag thickness.

[0010] Furthermore, the calculation formula for the target temperature Tset set in the furnace belly cooling wall temperature monitoring model is as follows:

[0011] Tset = (T1 + T2 + ... + T) N ) / N

[0012] Where T1 + T2 + ... + T N This refers to the operating temperature data of N furnace belly cooling walls during the 30-day stable period of the blast furnace when the furnace condition is good.

[0013] Furthermore, the steps for the slag skin thickness prediction model to determine the changing trend of slag skin thickness are as follows:

[0014] Set the temperature fluctuation range threshold ΔT;

[0015] When the furnace belly cooling wall temperature T is monitored in real time X Satisfying Tset-ΔT≤T X When ≤Tset+ΔT, the slag thickness prediction model determines that the slag thickness λ is in a stable state;

[0016] When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X When Tset+ΔT, if dTx / dt≥0 within time t, the slag thickness prediction model determines that the slag thickness λ is too thin and the slag is falling off.

[0017] When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X When <Tset-ΔT, if dTx / dt≤0 within time t, the slag skin thickness prediction model determines that the slag skin thickness λ is in an excessively thick state, and slag skin is being generated.

[0018] Wherein, ΔT is a manually set value, and its range is 0 to 100℃; time t is a manually set value, and its range is 1 to 12 hours.

[0019] Furthermore, the dynamic control model for cooling water flow rate dynamically controls the cooling water flow rate in the following steps:

[0020] When the furnace belly cooling wall temperature T is monitored in real time X Satisfying Tset-ΔT≤TX If the slag thickness λ is ≤Tset+ΔT and the slag thickness prediction model determines that the slag thickness λ is in a stable state, then close the enhanced cooling water pipe flow regulating valve.

[0021] When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X >Tset+ΔT, and the slag thickness prediction model determines that the slag thickness λ is too thin. Gradually open the enhanced cooling water pipe flow regulating valve until dTx / dt<0, and keep the regulating valve opening K unchanged.

[0022] When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X <Tset-ΔT, and the slag thickness prediction model determines that the slag thickness λ is too thick, so gradually close the flow regulating valve of the enhanced cooling water pipe until dTx / dt>0, and keep the valve opening K unchanged.

[0023] On the other hand, the present invention provides a dynamic cooling water regulation system for stabilizing the internal operating shape of the blast furnace belly, including a blast furnace and belly cooling wall temperature acquisition module, a belly cooling wall temperature monitoring module, a slag thickness prediction module, and a cooling water flow dynamic control module.

[0024] The blast furnace includes a belly cooling wall, a tuyere cooling wall, an enhanced cooling water pipe, and a flow regulating valve. The enhanced cooling water pipe is installed between the belly cooling wall and the tuyere cooling wall. The supply end of the enhanced cooling water pipe is connected to the tuyere sleeve cooling water supply ring pipe, and the drain end of the enhanced cooling water pipe is connected to the tuyere sleeve cooling water drain ring pipe. The flow regulating valve is located inside the enhanced cooling water pipe, and its opening is controlled by a cooling water flow dynamic control module.

[0025] The furnace belly cooling wall temperature acquisition module is used to acquire the furnace belly cooling wall temperature in real time and transmit it to the furnace belly cooling wall temperature monitoring module.

[0026] The furnace belly cooling wall temperature monitoring module is used to calculate the target temperature Tset based on the working temperature of the furnace belly cooling wall and transmit it to the slag thickness prediction module.

[0027] The slag thickness prediction module is used to determine the trend of slag thickness change based on the relationship between real-time temperature and target temperature Tset, and transmit it to the cooling water flow dynamic control module.

[0028] The cooling water flow dynamic control module is used to dynamically control the cooling water flow based on the changing trend of slag thickness.

[0029] Furthermore, the enhanced cooling water pipes are connected in series with 2 to 5 cooling walls as a group.

[0030] Furthermore, the cooling water pipe is made of copper.

[0031] The beneficial effects of this invention are as follows:

[0032] 1) It can stabilize the internal structure of the blast furnace belly and improve the safety of the furnace wall in the high heat load zone;

[0033] 2) The cooling water volume can be dynamically adjusted to ensure the long-term stability of the slag skin root area in the furnace belly region;

[0034] 3) In the early stage of furnace service, it can delay the erosion of the furnace lining in the tuyere swirling zone, and in the middle and late stages of furnace service, it can protect the tuyere cooling wall in the tuyere swirling zone and extend its service life.

[0035] 4) The system is simple and technically reliable. It does not rely on complex heat transfer models and can be controlled using only temperature data. It is easy to implement and has low investment costs.

[0036] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0038] Figure 1 This is a block diagram illustrating the principle of the dynamic adjustment method for cooling water in stabilizing the internal operating shape of a blast furnace belly as described in this invention.

[0039] Figure 2 This is a schematic diagram of the dynamic cooling water adjustment system for stabilizing the internal operating shape of the blast furnace belly as described in this invention.

[0040] Reference numerals: 1—Reinforced cooling water supply pipe, 2—Cooling water flow regulating valve, 3—Reinforced cooling drain pipe. Detailed Implementation

[0041] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0042] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0043] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0044] Example 1:

[0045] This invention provides a method for dynamically adjusting cooling water to stabilize the internal operating shape of a blast furnace belly, for a 2000m³ blast furnace. 3 The blast furnace employs an all-cast iron cooling wall design. First, a monitoring model for the furnace belly cooling wall temperature T, a prediction model for the slag thickness λ, and a dynamic control model for the cooling water flow rate Q are established in the control program. Then, N temperature values ​​T1, T2, ..., T3 are collected over one month when the blast furnace is in good condition. N And calculate the set target temperature Tset = (T1 + T2 + ... + T N ) / N. Assuming the collected temperature values ​​are calculated to obtain a target temperature Tset = 150℃, and the wall temperature fluctuation range ΔT = 50℃, when the real-time monitored temperature T of the furnace belly cooling wall... X =180℃ < 200℃ (Tset + ΔT), at this point, the slag thickness prediction model determines that the slag thickness λ is in a stable state, and the flow regulating valve 2 of the enhanced cooling water supply pipe 1 is closed; when the furnace belly cooling wall temperature T is monitored in real time... X =220℃>200℃, and dTx / dt≥0 within t=12h, indicating that the furnace belly cooling wall temperature is still rising. The slag thickness prediction model judges that the slag thickness λ is too thin and the slag is falling off. At this time, gradually open the enhanced cooling water pipe flow regulating valve until dT / dt<0, and keep the regulating valve opening K unchanged; when the furnace belly cooling wall temperature T is monitored in real time... X =80℃<100℃, and dTx / dt≤0 within t=12h, indicating that the temperature of the furnace belly cooling wall is still decreasing. The slag thickness prediction model judges that the slag thickness λ is in an excessively thick state and slag is being generated. At this time, the flow regulating valve of the enhanced cooling water pipe is gradually closed until dT / dt>0, and the opening degree K of the regulating valve is kept unchanged.

[0046] Example 2:

[0047] like Figure 2 As shown, this embodiment provides a dynamic cooling water regulation system for stabilizing the internal shape of the blast furnace belly, applicable to the method of Embodiment 1. The system includes a belly cooling wall and a tuyere cooling wall. It further includes an enhanced cooling water supply pipe 1, a drain pipe 3, and a flow regulating valve 2. The enhanced cooling water pipe is installed between the belly cooling wall and the tuyere cooling wall, with three cooling walls connected in series as a group. Its supply end is connected to the cooling water supply ring pipe of the tuyere sleeve, and its drain end is connected to the cooling water drain ring pipe of the tuyere sleeve.

[0048] Once the dynamic control model for cooling water flow generates a signal to adjust the opening of flow regulating valve 2, it transmits the signal to flow regulating valve 2 to achieve opening control.

[0049] In the above embodiments, the reference to "this embodiment" in the specification indicates that a specific feature, structure, or characteristic described in connection with the embodiment is included in at least some embodiments, but not necessarily all embodiments. Multiple appearances of "this embodiment" do not necessarily refer to the same embodiment.

[0050] In the above embodiments, although the invention has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory structures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed. The embodiments of the invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims.

[0051] As will be understood by those skilled in the art, the computer-readable storage medium described in this embodiment allows for the implementation of all or part of the steps in the above method embodiments by computer program-related hardware. The aforementioned computer program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0052] The electronic terminal provided in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication between them. The memory is used to store computer programs, the communication interface is used to perform communication, and the processor and the transceiver are used to run the computer programs, so that the electronic terminal performs the steps of the above method.

[0053] In this embodiment, the memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0054] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0055] This invention can be used in a wide range of general-purpose or special-purpose computing system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices, etc.

[0056] This invention can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This invention can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for dynamically adjusting cooling water to stabilize the internal operating conditions of a blast furnace belly, characterized in that: Includes the following steps: Collect the working temperatures of N furnace belly cooling walls during a stable period when the furnace condition is good. The target temperature Tset is calculated by processing N temperature data using a furnace belly cooling wall temperature monitoring model. Using a slag thickness prediction model, the temperature of the furnace belly cooling wall is collected in real time. Based on the deviation between the real-time temperature and the target temperature Tset and the relationship between the temperature change rate, the trend of slag thickness variation is determined. A dynamic control model for cooling water flow rate is used to dynamically control the cooling water flow rate based on the changing trend of slag thickness. The formula for calculating the target temperature Tset set in the furnace belly cooling wall temperature monitoring model is as follows: Tset=(T1+T2+……+T N ) / N Where T1 + T2 + ... + T N The data represents the working temperature of N furnace belly cooling walls during the 30-day stable period of the blast furnace when the furnace condition is good. The steps for the slag thickness prediction model to determine the changing trend of slag thickness are as follows: Set the temperature fluctuation range threshold ΔT; When the furnace belly cooling wall temperature T is monitored in real time X Satisfying Tset-ΔT≤T X When ≤Tset+ΔT, the slag thickness prediction model determines that the slag thickness λ is in a stable state; When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X When Tset+ΔT, if dTx / dt≥0 within time t, the slag thickness prediction model determines that the slag thickness λ is too thin and the slag is falling off. When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X When <Tset-ΔT, if dTx / dt≤0 within time t, the slag skin thickness prediction model determines that the slag skin thickness λ is in an excessively thick state, and slag skin is being generated. Wherein, ΔT is a manually set value, and its range is 0~100℃; time t is a manually set value, and its range is 1~12 hours; The dynamic control model for cooling water flow rate follows these steps: When the furnace belly cooling wall temperature T is monitored in real time X Satisfying Tset-ΔT≤T X If the slag thickness λ is ≤Tset+ΔT and the slag thickness prediction model determines that the slag thickness λ is in a stable state, then close the enhanced cooling water pipe flow regulating valve. When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X >Tset+ΔT, and the slag thickness prediction model determines that the slag thickness λ is too thin. Gradually open the enhanced cooling water pipe flow regulating valve until dTx / dt<0, and keep the regulating valve opening K unchanged. When the furnace belly cooling wall temperature T is monitored in real time X Satisfy T X <Tset-ΔT, and the slag thickness prediction model determines that the slag thickness λ is too thick, so gradually close the flow regulating valve of the enhanced cooling water pipe until dTx / dt>0, and keep the valve opening K unchanged.

2. A dynamic cooling water regulation system for stabilizing the internal operating conditions of a blast furnace belly, characterized in that: The cooling water dynamic adjustment method applicable to the stable blast furnace belly operation internal shape as described in claim 1, the system includes a blast furnace and belly cooling wall temperature acquisition module, a belly cooling wall temperature monitoring module, a slag thickness prediction module, and a cooling water flow dynamic control module. The blast furnace includes a belly cooling wall, a tuyere cooling wall, an enhanced cooling water pipe, and a flow regulating valve. The enhanced cooling water pipe is installed between the belly cooling wall and the tuyere cooling wall. The supply end of the enhanced cooling water pipe is connected to the tuyere sleeve cooling water supply ring pipe, and the drain end of the enhanced cooling water pipe is connected to the tuyere sleeve cooling water drain ring pipe. The flow regulating valve is located inside the enhanced cooling water pipe, and its opening is controlled by a cooling water flow dynamic control module. The furnace belly cooling wall temperature acquisition module is used to acquire the furnace belly cooling wall temperature in real time and transmit it to the furnace belly cooling wall temperature monitoring module. The furnace belly cooling wall temperature monitoring module is used to calculate the target temperature Tset based on the working temperature of the furnace belly cooling wall and transmit it to the slag thickness prediction module. The slag thickness prediction module is used to determine the trend of slag thickness change based on the relationship between real-time temperature and target temperature Tset, and transmit it to the cooling water flow dynamic control module. The cooling water flow dynamic control module is used to dynamically control the cooling water flow based on the changing trend of slag thickness.

3. The dynamic cooling water regulation system for stabilizing the internal operating shape of the blast furnace belly according to claim 2, characterized in that: The reinforced cooling water pipes are connected in series with 2 to 5 cooling walls as a group.

4. The dynamic cooling water regulation system for stabilizing the internal operating shape of a blast furnace belly according to claim 2, characterized in that: The cooling water pipe is made of copper.

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