Method and system for monitoring and analyzing cooling effect of circular cooler

Abstract

A method for monitoring and analyzing the cooling effect of a circular cooler comprises the steps that hot sintered ore is unloaded to the circular cooler from a sintering machine, cooling air is blown into the bottom of the circular cooler, the hot sintered ore is cooled through the cooling air in the circular cooler, and cooled sintered ore is obtained after cooling is completed; the method is characterized in that in the hot sinter cooling process under the historical working condition, through measurement and analysis processing of operation parameters of the annular cooler, a function relation expression of gas-solid comprehensive heat transfer coefficients of sinter and cooling air on the annular cooler is obtained through fitting, and therefore the predicted ore unloading temperature of the annular cooler under the current working condition is calculated; and the cooling effect of the circular cooler is predicted. By adopting the method, the cooling effect of the circular cooler can be accurately predicted, stable operation and safe production of the system are ensured, and the waste heat recovery efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the monitoring and analysis of the operating state of a cooling machine, in particular to a monitoring and analysis method and system for the cooling effect of a circular cooler, and belongs to the technical field of equipment state monitoring. BACKGROUND

[0002] In the prior art, the circular cooler is widely used as the core equipment for the sinter cooling process. The basic principle is that during the process of transporting sinter on a trolley, cooling air is sent to the lower part of the material layer by a blower to reduce the temperature of the sinter from about 700-750°C to about 100-150°C. During the cooling process, the heat released by the sinter is carried away by the cooling air and enters various waste heat recovery systems. At present, the sensible heat recovery efficiency of the circular cooler system is about 50%, and there is still a large space for waste heat recovery. In order to further improve the waste heat recovery efficiency of the circular cooler system, a series of optimization schemes such as air supply system and waste heat utilization mode are being introduced into the circular cooler at the present stage.

[0003] However, the circular cooler is affected by various factors in actual application:

[0004] 1. Large working condition fluctuation and parameter complexity. The physical properties of sinter, loading uniformity, trolley running speed, and environmental conditions and other factors cause large fluctuations in the heat exchange state inside the circular cooler. Traditional experience-based estimation based on historical data cannot accurately reflect the actual cooling and waste heat recovery.

[0005] 2. Optimization scheme design risk. Although a series of optimization schemes such as air supply system and waste heat utilization mode have been introduced at the present stage, due to the influence of working condition fluctuation and parameter variability, it is difficult to accurately predict the distribution of hot exhaust gas and the cooling effect of sinter in the circular cooler. If the optimization scheme design is unreasonable, it may cause abnormal distribution of hot exhaust gas, thereby seriously affecting the production efficiency, product quality and safety of the entire sintering system.

[0006] Therefore, it is necessary to further understand the complex heat exchange mechanism inside the circular cooler on the basis of the existing technology, to accurately monitor and control the heat exchange state inside the circular cooler, to achieve higher waste heat recovery efficiency, and to ensure the stable operation and safe production of the entire sintering system. SUMMARY

[0007] To address the problems existing in the prior art, this invention proposes a method and system for monitoring and analyzing the cooling effect of an annular cooler. In the technical solution of this invention, by measuring the operating parameters of the annular cooler under historical operating conditions, the heat transfer state inside the annular cooler is analyzed. This allows for the fitting of a functional relationship between the gas-solid integrated heat transfer coefficient of the sinter and cooling air on the annular cooler. Furthermore, the expected unloading temperature of the annular cooler under the current operating conditions is calculated, thus enabling the prediction of the cooling effect of the annular cooler. This ensures stable system operation and safe production, and improves waste heat recovery efficiency.

[0008] According to a first embodiment of the present invention, a method for monitoring and analyzing the cooling effect of an annular cooler is provided.

[0009] A method for monitoring and analyzing the cooling effect of an annular cooler involves unloading hot sintered ore from a sintering machine into an annular cooler. Cooling air is blown into the bottom of the annular cooler, and the hot sintered ore is cooled by the cooling air inside the cooler, resulting in cooled sintered ore. During the cooling process of hot sintered ore under historical operating conditions, the operating parameters of the annular cooler are measured and analyzed to fit a functional relationship between the gas-solid comprehensive heat transfer coefficient of the sintered ore and the cooling air on the annular cooler. This allows for the calculation of the expected unloading temperature of the annular cooler under current operating conditions, thus predicting the cooling effect of the annular cooler under the current conditions.

[0010] In this invention, during the cooling process of hot sintered ore under historical operating conditions, the gas-solid comprehensive heat transfer coefficient between the sintered ore and the cooling air on the annular cooler is fitted by measuring and analyzing the operating parameters of the annular cooler, thereby calculating the expected unloading temperature of the annular cooler under the current operating conditions. Specifically, this includes the following steps:

[0011] S1. Historical data measurement and collection: The production parameters and heat exchange process parameters of the annular cooler under historical operating conditions are measured and collected.

[0012] S2. Historical Data Analysis and Processing: Along the running direction of the annular cooler trolley, the sintered ore layer on the annular cooler is divided into multiple sections. For each section, a heat balance between the sintered ore and the cooling air is established, thereby calculating the gas-solid integrated heat transfer coefficient of each section. This yields the gas-solid integrated heat transfer coefficient between the sintered ore and the cooling air on the annular cooler under different conditions.

[0013] S3. Fitting the functional relationship of the gas-solid integrated heat transfer coefficient: Based on the gas-solid integrated heat transfer coefficient of sinter and cooling air under different conditions obtained in step S2, fit the functional relationship of the gas-solid integrated heat transfer coefficient.

[0014] S4. Prediction of the cooling effect of the annular cooler: Based on the functional relationship of the gas-solid integrated heat transfer coefficient fitted in step S3, calculate the gas-solid integrated heat transfer coefficient between the sinter and the cooling air under the current operating conditions in the annular cooler. Then, based on the principle of heat balance, calculate the expected unloading temperature of the annular cooler during the material feeding stage, thereby predicting the cooling effect of the annular cooler.

[0015] In this invention, in step S1, the production parameters include the throughput of the annular cooler per unit time and the thickness of the material layer in the annular cooler. The heat exchange process parameters include the sinter feeding temperature, the sinter material layer distribution and particle size distribution, the sinter unloading temperature, the cooling air temperature and cooling air volume at the lower part of the sinter material layer at different locations, and the hot waste gas temperature at the upper part of the sinter material layer at different locations.

[0016] In this invention, step S2 specifically includes:

[0017] Along the running direction of the annular cooler trolley, m sets of temperature and flow measurement points are evenly set at corresponding positions above and below the material layer in the annular cooler. Using these temperature and flow measurement points as boundaries, the sintered ore layer on the annular cooler is evenly divided into m-1 segments. For each segment, a heat balance equation between the sintered ore and the cooling air is established. That is:

[0018]

[0019]

[0020] in:

[0021]

[0022] In equations (1)-(3): The specific heat capacity of the cooling air, J / (m³) 3 ·℃). m is the cooling air volume of the i-th material layer on the annular cooler. 3 / s. The temperature of the hot exhaust gas at the upper part of the feed end of the i-th section of the ring cooler is ℃. The temperature of the hot exhaust gas above the discharge end of the i-th section of the annular cooler is ℃. The cooling air temperature at the bottom of the i-th section of the material layer on the annular cooler, in °C. Let be the gas-solid combined heat transfer coefficient of the i-th material layer in the annular cooler, W / (m²). 2 ·℃). C is the gas-solid heat exchange area of ​​each material layer on the annular cooler, in m². 2 ε is the porosity of the sintered ore layer on the annular cooler. D is the volume of sintered ore in each section of the annular cooler (calculated by multiplying the length of each section by the width of the trolley by the thickness of the ore layer), in meters. 3 dp is the equivalent diameter of the sinter, in meters. , is the initial temperature of the sinter in the i-th section of the ring cooler, in °C. The sintering temperature of the i-th section of the material layer in the annular cooler is ℃. denoted as , where is the specific heat capacity of the sinter, J / (kg·℃). B represents the throughput of the annular cooler per unit time, kg / s.

[0023] Based on the above heat balance equation, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler is calculated, thereby obtaining the gas-solid integrated heat transfer coefficient of sinter and cooling air on the annular cooler under different cooling air volume, cooling air temperature, initial temperature of sinter, and material layer thickness.

[0024] In this invention, step S3 specifically includes:

[0025] Based on the gas-solid integrated heat transfer coefficients obtained in step S2 for sinter and cooling air under different cooling air volume, cooling air temperature, initial sinter temperature, and bed thickness, a functional relationship for the gas-solid integrated heat transfer coefficient is fitted. That is:

[0026]

[0027] In equation (4): Let be the gas-solid combined heat transfer coefficient of the i-th material layer in the annular cooler, W / (m²). 2 ·℃). m is the cooling air volume of the i-th material layer on the annular cooler. 3 / s. The temperature of the cooling air at the bottom of the i-th section of the material layer on the annular cooler is ℃. is the initial temperature of the sinter in the i-th section of the annular cooler, in °C. h is the thickness of the material layer in the annular cooler, in meters. , , , , , All are adjustment coefficients, among which, The value range is 0.95~1.03 s / m 3 , The value range is 0.9~1.1 ℃ -1 , The value range is 0.9~1.06 ℃ -1 , The value range is 0.92~1.05 m. -1 , The value range is 0.99~1.01 W / (m 2 ·℃), The value range is 0.8~1.2 W / (m 2 ·℃).

[0028] In this invention, step S4 specifically includes:

[0029] Based on the functional relationship (4) of the gas-solid integrated heat transfer coefficient fitted in step S3, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler under the current operating conditions is calculated. Then, based on the principle of heat balance and combined with the calculated gas-solid integrated heat transfer coefficient, the expected unloading temperature of the annular cooler is estimated during the material distribution stage. Wherein:

[0030]

[0031]

[0032] in:

[0033]

[0034] In equations (5)-(7): The specific heat capacity of the cooling air, J / (m³) 3 ·℃). The cooling air volume (m) for the j-th section of the material layer in the annular cooler under the current operating conditions. 3 / s. The temperature of the hot exhaust gas above the j-th section of the material layer on the annular cooler under the current operating conditions is ℃. The temperature of the cooling air at the bottom of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃. B' represents the specific heat capacity of the sinter, in J / (kg·℃). B' represents the throughput of the annular cooler per unit time under the current operating conditions, in kg / s. The initial ore temperature (°C) of the j-th section of the material layer on the annular cooler under the current operating conditions. The expected termination temperature of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃. The gas-solid combined heat transfer coefficient of the j-th section of the material bed in the annular cooler under the current operating conditions, in W / (m²). 2 ·℃). The gas-solid heat exchange area of ​​each material layer on the annular cooler under current operating conditions, in meters. 2 ε' represents the porosity of the sintered ore bed in the annular cooler under the current operating conditions. D' represents the volume of sintered ore in each section of the annular cooler under the current operating conditions, in meters. 3 dp' is the equivalent diameter of the sinter under the current operating conditions, in meters.

[0035] In the calculation process, the gas-solid integrated heat transfer coefficient of each section of the material layer on the annular cooler under the current working condition is first calculated according to formula (4). Then, based on the initial ore temperature (i.e., sintering ore feeding temperature) of the first section of the material layer on the annular cooler under the current working condition, the cooling air temperature and cooling air volume at the bottom of the first section of the material layer are calculated by combining the above formulas (5)-(7). The expected termination ore temperature of the first section of the material layer on the annular cooler and the hot exhaust gas temperature at the top of the first section of the material layer are then used as the initial ore temperature of the second section of the material layer. The calculation is carried out sequentially according to formulas (5)-(7) until the last section of the material layer on the annular cooler is calculated, and the expected unloading temperature of the sintered ore on the annular cooler is obtained. Thus, the expected unloading temperature of the annular cooler is calculated at the feeding stage of the annular cooler, and the hot exhaust gas temperature distribution of the annular cooler is obtained, so as to further realize the prediction of the cooling effect of the annular cooler.

[0036] It should be noted that although the specific heat capacity of materials such as cooling air (or hot exhaust gas) and sintered ore changes with temperature, the change is relatively small. Therefore, to simplify calculations, this application uses a compromise value for the specific heat capacity of cooling air (or hot exhaust gas) and sintered ore in the calculations. This treatment of the specific heat capacity does not affect the overall inventive concept of this application.

[0037] In this invention, the method further includes:

[0038] S5. Circular Cooler Cooling Effect Control: Set the target unloading temperature of the circular cooler to T. s目标 The expected unloading temperature of the annular cooler obtained in step S4 is T. s预计 Calculate the absolute value of the difference between the expected unloading temperature and the target unloading temperature of the annular cooler, denoted as Δt. Where:

[0039]

[0040] S501. If Δt > 10℃, it indicates that the expected unloading temperature of the annular cooler deviates significantly from the target unloading temperature. Adjust the total air volume of all blowers into the annular cooler so that Δt ≤ 10℃.

[0041] S502. If Δt≤10℃, it means that the deviation between the expected unloading temperature and the target unloading temperature of the annular cooler is small and the deviation is within a reasonable range. Continue to operate with the existing parameters.

[0042] As a preferred option, T s目标 The value range is 100~150℃, preferably 105~130℃.

[0043] According to a second embodiment of the present invention, a system for monitoring and analyzing the cooling effect of an annular cooler is provided.

[0044] A monitoring and analysis system for the cooling effect of an annular cooler, or a system for the method described in the first embodiment, is disclosed. The system includes a sintering machine and an annular cooler. The annular cooler is located downstream of the sintering machine, and the two are connected via a discharge device. A tail section temperature identification device is provided at the tail end of the sintering machine. A material layer cross-section scanning device and a material level detection device are provided at the feed inlet of the annular cooler. A material temperature detection device is provided at the discharge outlet of the annular cooler. Multiple sets of first gas temperature detection devices are uniformly arranged above the material layer of the annular cooler along the running direction of the annular cooler trolley; correspondingly, multiple sets of second gas temperature detection devices and gas flow detection devices are uniformly arranged at corresponding positions below the material layer of the annular cooler. The system also includes a granulation device located downstream of the annular cooler, and the annular cooler and the granulation device are connected via a belt. A particle size detection device is also provided on the belt.

[0045] In this invention, the bottom of the annular cooler is equipped with multiple fans. A material flow detection device is also installed at the feed inlet of the annular cooler.

[0046] Preferably, multiple sets of the first gas temperature detection devices are positioned at the same height above the material layer of the annular cooler. Multiple sets of the second gas temperature detection devices are positioned at the same height below the material layer of the annular cooler. Multiple sets of the gas flow detection devices are positioned at the same height below the material layer of the annular cooler.

[0047] In this invention, the system also includes a controller. The controller is connected to the tail section temperature identification device, the material layer section scanning device, the material level detection device, the material temperature detection device, the first gas temperature detection device, the second gas temperature detection device, the gas flow detection device, the particle size detection device, the fan, and the material flow detection device, and controls the operation of the corresponding devices.

[0048] To address the technical problem in existing technologies where the cooling effect of the annular cooler is difficult to predict accurately, potentially leading to abnormal distribution of hot exhaust gas and severely impacting the production efficiency, product quality, and safety of the entire sintering system, this invention proposes a method for monitoring and analyzing the cooling effect of the annular cooler. In this invention, by measuring the operating parameters of the annular cooler under historical conditions, the heat transfer state inside the cooler is analyzed. This allows for the fitting of a functional relationship between the gas-solid integrated heat transfer coefficient of the sinter and the cooling air in the annular cooler. Furthermore, the expected unloading temperature of the annular cooler under current operating conditions can be calculated, enabling the prediction of the cooling effect of the annular cooler. This ensures stable system operation and safe production, and improves waste heat recovery efficiency.

[0049] Furthermore, this invention, by measuring and collecting historical operating parameters of the annular cooler, divides the sintered ore layer on the annular cooler into multiple segments. For each segment, a heat balance is established between the sintered ore and the cooling air, thereby calculating the gas-solid integrated heat transfer coefficient for each segment. This yields the gas-solid integrated heat transfer coefficient of the sintered ore and cooling air under different conditions, and a functional relationship for the gas-solid integrated heat transfer coefficient is fitted. Based on this functional relationship, the gas-solid integrated heat transfer coefficient of the sintered ore and cooling air under the current operating conditions is calculated. Then, based on the principle of heat balance, the expected unloading temperature of the annular cooler is calculated during the material feeding stage, thus achieving accurate prediction of the cooling effect of the annular cooler. This accurate prediction allows for advance understanding of the cooling effect of the annular cooler, facilitating timely adjustment of cooling parameters, improving cooling efficiency, and ultimately increasing the overall production efficiency of the sintering system. Moreover, accurate prediction of the cooling effect of the annular cooler can reduce equipment failures or safety hazards caused by improper temperature control, thereby improving the safety of the entire sintering system. Furthermore, this accurate prediction method based on the principle of heat balance can provide stable temperature conditions for the subsequent processing of sintered ore, ensuring the stability and consistency of product quality.

[0050] Specifically, the method for monitoring and analyzing the cooling effect of the annular cooler proposed in this invention mainly includes the following steps:

[0051] S1. Historical Data Measurement and Collection:

[0052] This step primarily involves acquiring and collecting production parameters and heat exchange process parameters during the operation of the annular cooler. Production parameters include the cooler's throughput (i.e., the amount processed per unit time) and the thickness of the material layer. Heat exchange process parameters include the sinter feeding temperature (i.e., the initial temperature of the hot sinter), the sinter layer distribution and particle size distribution, the sinter discharge temperature, the cooling air temperature and flow rate at different locations below the sinter layer, and the hot exhaust gas temperature at different locations above the sinter layer. Here, "different locations" refers to the different segments of the sinter layer on the annular cooler. Therefore, the heat exchange process parameters to be acquired include the cooling air temperature and flow rate at the bottom of each segment of the sinter layer, and the hot exhaust gas temperature at the top of each segment.

[0053] S2. Historical Data Analysis and Processing:

[0054] Along the running direction of the annular cooler trolley, this invention sequentially and evenly sets m sets of temperature and flow measurement points below the annular cooler material layer. Correspondingly, the same number of temperature measurement points are sequentially and evenly set at corresponding positions above the annular cooler material layer. Using these temperature and flow measurement points as dividing lines, the sintered ore layer on the annular cooler is uniformly divided into m-1 segments. At this time, as...Figure 4 As shown, the upstream temperature measuring point located below the i-th material layer is used to detect the temperature of the cooling air below the inlet end of the i-th material layer. The upstream flow measurement point located below the i-th material layer is used to detect the cooling air volume in the lower part of the i-th material layer. The upstream temperature measuring point located above the i-th material layer is used to detect the temperature of the hot exhaust gas above the feed end of the i-th material layer. Correspondingly, the downstream temperature measuring point located below the i-th material layer is used to detect the temperature of the cooling air below the discharge end of the i-th material layer. The downstream temperature measuring point located above the i-th material layer is used to detect the temperature of the hot waste gas above the discharge end of the i-th material layer. .

[0055] It should be noted that the specific number of temperature and flow measurement points set in step S2 is not limited. The number of sets is sufficient to ensure that the cooling air volume of each material layer remains constant or essentially constant after segmentation. In other words, the cooling air volume remains constant at all locations within the same material layer after segmentation, and correspondingly, the cooling air temperature within the same material layer also remains essentially constant. That is, the cooling air temperature at the lower part of the inlet end and the lower part of the outlet end of the i-th material layer are both... .

[0056] After segmenting the material, a heat balance equation is established between the sinter and the cooling air for each segment. The heat balance equation for each material layer is as follows:

[0057]

[0058]

[0059]

[0060] Based on the above heat balance equation, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler was calculated, thereby obtaining the gas-solid integrated heat transfer coefficient of sinter and cooling air on the annular cooler under different conditions (i.e., different cooling air volume, cooling air temperature, initial temperature of sinter, and material layer thickness). Among them, the gas-solid integrated heat transfer coefficients of each material layer under some historical operating conditions are shown in Table 1 below.

[0061] Table 1. Gas-solid combined heat transfer coefficients of sinter and cooling air under different conditions in annular coolers.

[0062]

[0063] It should be noted that in Table 1, the cooling air volume refers to the cooling air volume at the bottom of a certain section of the material layer on the annular cooler, the cooling air temperature corresponds to the cooling air temperature at the bottom of the corresponding section of the material layer on the annular cooler, the initial temperature of the sinter corresponds to the initial temperature of the sinter in the corresponding section of the material layer on the annular cooler, and the material layer thickness corresponds to the thickness of the corresponding section of the material layer on the annular cooler (generally speaking, after the material is laid, the thickness of each section of the material layer on the annular cooler is basically the same).

[0064] In this application, for ease of calculation, the material layer of the annular cooler is divided into multiple segments along the direction of the trolley's movement. With a stable material layer thickness, the volume of sinter in each segment is the same. Using the calculation method in step S2, the gas-solid integrated heat transfer coefficient can be obtained under various conditions—different cooling air volumes, different cooling air temperatures, and different initial sinter temperatures—with the same material layer thickness. Alternatively, the material layer thickness can be varied to obtain the gas-solid integrated heat transfer coefficient for different material layer thicknesses.

[0065] S3. Fitting the functional relationship of the gas-solid combined heat transfer coefficient:

[0066] Based on the gas-solid integrated heat transfer coefficients obtained in step S2 above, under different cooling air volumes, cooling air temperatures, initial sinter temperatures, and bed thicknesses, a functional relationship for the gas-solid integrated heat transfer coefficients is fitted. Wherein:

[0067]

[0068] By using the functional relationship (4), the gas-solid integrated heat transfer coefficient under any conditions (i.e., any combination of cooling air volume, cooling air temperature, initial temperature of sintered ore, and material layer thickness) can be calculated, thereby significantly improving the applicability of this application.

[0069] S4. Prediction of cooling effect of the annular cooler:

[0070] Since the sinter does not undergo relative movement within the annular cooler trolley, the material distribution and related parameters at the material distribution point of the annular cooler can be used for calculations during one cycle of the cooler's operation. Therefore, using the functional relationship between the gas-solid combined heat transfer coefficient of the sinter and cooling air fitted in step S3, the gas-solid combined heat transfer coefficient of each material layer on the annular cooler under the current operating conditions can be calculated. Then, based on the principle of heat balance, the expected unloading temperature of the annular cooler can be estimated during the material distribution stage. The calculation formula is as follows:

[0071]

[0072]

[0073] in:

[0074]

[0075] In the above formula, The temperature of the hot exhaust gas above the j-th section of the material layer on the annular cooler under the current operating conditions can be understood as the average temperature of the hot exhaust gas above this section of the material layer. This indicates the cooling air temperature at the bottom of the j-th section of the material layer in the annular cooler under the current operating conditions. This represents the cooling air volume of the j-th material layer on the annular cooler under the current operating conditions. It should be noted that the cooling air volume of each material layer on the annular cooler under the current operating conditions is determined as follows: 1. Measure the cooling air volume and temperature of each material layer under historical operating conditions, convert them to standard condition values, and thus obtain the distribution ratio of the standard condition air volume for each material layer; 2. Based on the current operating conditions, such as the sinter feeding temperature, the target unloading temperature after cooling, the sinter processing volume, the average temperature of the hot exhaust gas above the material layer of the annular cooler (which can be determined based on historical operating conditions), and the cooling air temperature below the material layer of the annular cooler, establish a heat balance equation to calculate the target air volume required to achieve the cooling effect; 3. Install multiple fans at the bottom of the annular cooler, with each fan corresponding to a specific area. Distribute the air volume of each fan (the sum of the air volumes of all fans is the target air volume) to each material layer in the corresponding area according to the ratio calculated in step 1, thereby determining the cooling air volume of each material layer. Of course, after the distribution is completed, the cooling air volume of each material layer can also be measured by the flow measurement point set below each material layer. Correspondingly, the cooling air temperature can also be measured by the temperature measurement point set below each material layer. In other words, under the current working conditions, the cooling air volume and cooling air temperature of each material layer on the annular cooler can be obtained by actual measurement after the distribution is completed.

[0076] In the specific calculation process, after obtaining the gas-solid integrated heat transfer coefficient of the first section of the material layer on the annular cooler under the current working condition according to formula (4), the initial ore temperature (i.e., sintered ore feeding temperature), cooling air temperature and cooling air volume of the first section of the material layer on the annular cooler under the current working condition are known. By combining formulas (5)-(7), the expected termination ore temperature of the first section of the material layer on the annular cooler and the hot waste gas temperature of the upper part of the first section of the material layer can be calculated. Then, the expected termination ore temperature of the first section of the material layer on the annular cooler is used as the initial ore temperature of the second section of the material layer. At this time, the temperature of the first section of the material layer on the annular cooler under the current working condition can be obtained according to formula (4). The gas-solid integrated heat transfer coefficient of the two material layers can be used to calculate the expected termination temperature of the second material layer and the hot exhaust gas temperature above the second material layer using formulas (5)-(7). Then, the expected termination temperature of the second material layer on the ring cooler is used as the initial temperature of the third material layer. The calculation is performed sequentially according to formulas (4)-(7) until the last material layer is calculated, and the expected unloading temperature of the sinter is obtained. Thus, the expected unloading temperature of the ring cooler can be calculated during the material feeding stage of the ring cooler, and the hot exhaust gas temperature distribution of the ring cooler can be obtained, further realizing the accurate prediction of the cooling effect of the ring cooler.

[0077] It is worth noting that, in the process of calculating the expected unloading temperature of the annular cooler, this invention also simultaneously obtains the temperature distribution of the hot exhaust gas from the annular cooler. Generally speaking, the temperature distribution of the hot exhaust gas is one of the important indicators for evaluating the cooling performance of the annular cooler. The temperature distribution of the hot exhaust gas directly reflects the heat exchange efficiency between the sinter and the cooling air in the annular cooler. If the temperature distribution of the hot exhaust gas is uniform and within a reasonable range, it indicates a good cooling effect. Moreover, by monitoring the temperature distribution of the hot exhaust gas, problem areas in the cooling process can be identified, and cooling parameters can be adjusted in a targeted manner to optimize the cooling effect. In addition, the temperature distribution of the hot exhaust gas can also help evaluate the energy utilization efficiency of the annular cooler. Therefore, the temperature distribution of the hot exhaust gas is also one of the important bases for judging the cooling effect of the annular cooler. This invention first calculates the expected unloading temperature of the annular cooler to predict the cooling effect of the annular cooler. Secondly, this invention also simultaneously obtains the temperature distribution of the hot exhaust gas from the annular cooler to further enhance the accurate prediction of the cooling effect or the operating status of the annular cooler, thereby ensuring the stable operation and safe production of the system and improving the waste heat recovery efficiency.

[0078] As a preferred embodiment, the method for monitoring and analyzing the cooling effect of the annular cooler proposed in this invention further includes:

[0079] S5, Cooling effect control of the annular cooler:

[0080] This application aims to accurately predict the cooling effect of the annular cooler. Therefore, the present invention needs to control the deviation between the calculated expected unloading temperature of the annular cooler and the target unloading temperature within a small range.

[0081] Specifically, the target unloading temperature of the annular cooler is set to T. s目标 (e.g., T) s目标 The value range is 100~150℃, preferably 105~130℃), and the expected unloading temperature of the annular cooler obtained in step S4 is T. s预计 Calculate the absolute value of the difference between the expected unloading temperature and the target unloading temperature of the annular cooler, denoted as Δt. Where:

[0082]

[0083] S401. If Δt > 10℃, it indicates that the expected unloading temperature of the annular cooler deviates significantly from the target unloading temperature. In this case, the total air volume of all blowers into the annular cooler should be adjusted to make Δt ≤ 10℃.

[0084] The calculation of the specific adjustment amount Δq of the total blower volume is first performed by calculating the actual blower volume of each fan into the annular cooler per unit time using the relevant parameters of each fan under the current operating conditions, thereby obtaining the actual total blower volume q of all fans into the annular cooler per unit time under the current operating conditions. 实际 Then, by establishing the heat balance equation of the annular cooler system under historical operating conditions (i.e., the sum of the total heat carried into the annular cooler by the cooling air and the total heat carried into the annular cooler by the hot sinter is equal to the sum of the total heat carried out of the annular cooler by the hot exhaust gas, the total heat carried out of the annular cooler by the cooled sinter, and the heat loss), the system leakage rate is calculated (the system leakage rate remains basically unchanged over a period of time). Based on the system leakage rate, the heat balance equation of the annular cooler system under the current operating conditions is established, thereby obtaining the target total air volume q required for the annular cooler to reach the target unloading temperature. 目标 Finally, the difference between the actual total blower volume and the target total blower volume is calculated, which yields the adjustment amount for the total blower volume of all fans entering the annular cooler (i.e., Δq = q). 目标 - q 实际 Adjust the total airflow from all fans into the annular cooler, with the adjustment amount being Δq, so that Δt ≤ 10℃. If Δq > 0, it indicates that the actual total airflow is less than the target total airflow, meaning the cooling airflow is insufficient under current conditions; in this case, increase the total airflow from all fans. If Δq < 0, it indicates that the actual total airflow is greater than the target total airflow; considering factors such as waste heat utilization efficiency, the total airflow from all fans can be reduced as needed.

[0085] S402. If Δt≤10℃, it means that the deviation between the expected unloading temperature and the target unloading temperature of the annular cooler is small and the deviation is within a reasonable range. It is sufficient to maintain the existing parameters.

[0086] Based on the aforementioned method for monitoring and analyzing the cooling effect of the annular cooler, this invention also proposes a corresponding monitoring and analysis system for the cooling effect of the annular cooler. This system includes a sintering machine, an annular cooler located downstream of the sintering machine, and a granulation unit located downstream of the annular cooler. The sintering machine and the annular cooler are connected via a discharge device (e.g., a discharge chute), and the annular cooler and the granulation unit are connected via a belt conveyor. The sintering machine is equipped with a tail section temperature identification device at its tail end to measure the initial temperature of the hot sinter (i.e., the sinter feeding temperature). The annular cooler is equipped with a material layer cross-section scanning device and a material level detection device at its feed inlet. The material layer cross-section scanning device scans the material layer distribution on the annular cooler to calculate the porosity of the sinter bed; the material level detection device measures the material thickness (i.e., the material layer thickness) of the annular cooler. A material temperature detection device (e.g., an infrared thermometer) is installed at the discharge port of the annular cooler to measure the discharge temperature. Generally, the material temperature detection device can be set at the position of the second to third trolley from the end of the discharge point. Along the running direction of the annular cooler trolleys, multiple sets of first gas temperature detection devices (e.g., thermocouples) are evenly installed above the material layer. These first gas temperature detection devices are fixed to the upper side panels of each annular cooler trolley and are used to measure the temperature of the hot exhaust gas after heat exchange with the sinter at different locations. Correspondingly, multiple sets of second gas temperature detection devices (e.g., thermocouples) and gas flow detection devices (e.g., flow meters) are evenly installed at corresponding positions below the material layer. These second gas temperature detection devices and gas flow detection devices are fixed to the lower side panels of the grate bars of each annular cooler trolley and are used to measure the cooling air temperature and cooling air flow (i.e., cooling air volume) at different locations, respectively. A particle size detection device is also installed on the belt between the ring cooler and the granulation unit to detect the particle size distribution and equivalent diameter of the sinter.

[0087] In this invention, the annular cooler is equipped with multiple fans at its bottom. Each fan has an inlet pressure detection device on its inlet pipe and an outlet pressure detection device on its outlet pipe, used to measure the total pressure of each fan. The system also includes a material flow detection device located at the annular cooler's feed inlet, used to detect the processing capacity of the annular cooler per unit time (wherein: the processing capacity of the annular cooler can also be obtained from the upstream sintering system; the material flow detection device provides a more accurate measure of the annular cooler's processing capacity).

[0088] It should be noted that, in order to ensure the accuracy and consistency of data measurements at different locations, multiple sets of the first gas temperature detection devices are set at the same height above the material layer of the annular cooler, multiple sets of the second gas temperature detection devices are set at the same height below the material layer of the annular cooler, and multiple sets of the gas flow detection devices are set at the same height below the material layer of the annular cooler.

[0089] All formulas in this invention were obtained by the inventor based on experimental and engineering applications. All calculations were performed by substituting the converted values ​​into the formulas after the units were converted (after the units were converted, only the values ​​were substituted into the formulas, not the units; the units were only used to adjust the size of the values).

[0090] Compared with the prior art, the present invention has the following beneficial technical effects:

[0091] 1. This invention analyzes the heat exchange state inside the annular cooler by measuring the operating parameters of the annular cooler under historical operating conditions, thereby fitting a functional relationship between the gas-solid comprehensive heat transfer coefficient of the sinter and the cooling air on the annular cooler, and then calculating the expected unloading temperature of the annular cooler under the current operating conditions, so as to predict the cooling effect of the annular cooler, ensure the stable operation and safe production of the system, and improve the waste heat recovery efficiency.

[0092] 2. This invention divides the sintered ore layer on the annular cooler into multiple segments. For each segment, a thermal balance between the sintered ore and cooling air is established under historical operating conditions. This allows for the calculation of the gas-solid integrated heat transfer coefficient for each segment, and the fitting of a functional relationship for the gas-solid integrated heat transfer coefficient. Based on this functional relationship, the gas-solid integrated heat transfer coefficient between the sintered ore and cooling air on the annular cooler under the current operating conditions is calculated. Then, based on the principle of heat balance, the expected unloading temperature of the annular cooler is calculated during the material feeding stage. This enables accurate prediction of the cooling effect of the annular cooler, which helps to adjust the cooling parameters of the annular cooler in a timely manner, improves cooling efficiency, and thus improves the production efficiency, product quality, and safety of the entire sintering system.

[0093] 3. Based on the calculation of the expected unloading temperature of the annular cooler, this invention also simultaneously obtains the temperature distribution of the corresponding hot exhaust gas of the annular cooler, further enhancing the accurate prediction of the cooling effect or the operating status of the annular cooler.

[0094] 4. The present invention also proposes a system to complement the method for monitoring and analyzing the cooling effect of the annular cooler. The system has a simple structure, is easy to operate, and can realize real-time monitoring and accurate analysis of the cooling effect of the annular cooler. Attached Figure Description

[0095] Figure 1 This is a schematic diagram of the structure of a system for monitoring and analyzing the cooling effect of an annular cooler according to the present invention;

[0096] Figure 2 This is a schematic diagram of the particle size detection device included in this invention;

[0097] Figure 3 This is a schematic diagram of the controller connection in this invention;

[0098] Figure 4This is a schematic diagram of the heat balance calculation of the i-th section of the material layer on the ring cooler under historical operating conditions in this invention;

[0099] Figure 5 This is a schematic diagram illustrating the calculation of the cooling effect of the j-th section of the material layer on the annular cooler under the current operating conditions in this invention.

[0100] Figure label:

[0101] 1: Sintering machine; 2: Circular cooler; 3: Tail section temperature identification device; 4: Material layer section scanning device; 5: Material level detection device; 6: Material temperature detection device; 701: First gas temperature detection device; 702: Second gas temperature detection device; 8: Gas flow detection device; 9: Granulation device; 10: Particle size detection device; 11: Fan; 12: Material flow detection device; 13: Controller. Detailed Implementation

[0102] The technical solution of the present invention will be illustrated below with examples. The scope of protection sought by the present invention includes, but is not limited to, the following embodiments.

[0103] According to a second embodiment of the present invention, a system for monitoring and analyzing the cooling effect of an annular cooler is provided.

[0104] A monitoring and analysis system for the cooling effect of an annular cooler, or a system for the method described in the first embodiment, is provided. The system includes a sintering machine 1 and an annular cooler 2. The annular cooler 2 is located downstream of the sintering machine 1, and the two are connected via a discharge device. A tail section temperature identification device 3 is provided at the tail end of the sintering machine 1. A material layer cross-section scanning device 4 and a material level detection device 5 are provided at the feed inlet of the annular cooler 2. A material temperature detection device 6 is provided at the discharge outlet of the annular cooler 2. Multiple sets of first gas temperature detection devices 701 are evenly arranged above the material layer of the annular cooler 2 along the running direction of the trolley. Correspondingly, multiple sets of second gas temperature detection devices 702 and gas flow detection devices 8 are evenly arranged at corresponding positions below the material layer of the annular cooler 2. The system also includes a granulation device 9 located downstream of the annular cooler 2, and the annular cooler 2 and the granulation device 9 are connected by a belt. A particle size detection device 10 is also provided on the belt.

[0105] In this invention, the bottom of the annular cooler 2 is equipped with multiple fans 11. The feed inlet of the annular cooler 2 is also equipped with a material flow detection device 12.

[0106] Preferably, multiple sets of the first gas temperature detection devices 701 are positioned at the same height above the material layer of the annular cooler 2. Multiple sets of the second gas temperature detection devices 702 are positioned at the same height below the material layer of the annular cooler 2. Multiple sets of the gas flow detection devices 8 are positioned at the same height below the material layer of the annular cooler 2.

[0107] In this invention, the system also includes a controller 13. The controller 13 is connected to the tail section temperature identification device 3, the material layer section scanning device 4, the material level detection device 5, the material temperature detection device 6, the first gas temperature detection device 701, the second gas temperature detection device 702, the gas flow detection device 8, the particle size detection device 10, the fan 11, and the material flow detection device 12, and controls the operation of the corresponding devices.

[0108] Example 1

[0109] like Figures 1-2 As shown, a monitoring and analysis system for the cooling effect of an annular cooler is disclosed. The system includes a sintering machine 1 and an annular cooler 2. The annular cooler 2 is located downstream of the sintering machine 1, and the two are connected via a discharge device. A tail section temperature identification device 3 is installed at the tail end of the sintering machine 1. A material layer cross-section scanning device 4 and a material level detection device 5 are installed at the feed inlet of the annular cooler 2. A material temperature detection device 6 is installed at the discharge outlet of the annular cooler 2. Along the running direction of the annular cooler 2 trolley, 80 sets of first gas temperature detection devices 701 are evenly arranged above the material layer of the annular cooler 2, and correspondingly, 80 sets of second gas temperature detection devices 702 and gas flow detection devices 8 are evenly arranged at corresponding positions below the material layer of the annular cooler 2. The system also includes a granulation device 9 located downstream of the annular cooler 2, and the annular cooler 2 and the granulation device 9 are connected by a belt. A particle size detection device 10 is also installed on the belt.

[0110] Example 2

[0111] The embodiment 1 is repeated, except that the bottom of the annular cooler 2 is equipped with four fans 11. The feed inlet of the annular cooler 2 is also equipped with a material flow detection device 12.

[0112] Example 3

[0113] Example 2 is repeated, except that 80 sets of the first gas temperature detection devices 701 are positioned at the same height above the material layer of the annular cooler 2. 80 sets of the second gas temperature detection devices 702 are positioned at the same height below the material layer of the annular cooler 2. 80 sets of the gas flow detection devices 8 are positioned at the same height below the material layer of the annular cooler 2.

[0114] Example 4

[0115] like Figure 3As shown, Embodiment 3 is repeated, except that the system also includes a controller 13. The controller 13 is connected to the tail section temperature identification device 3, the material layer section scanning device 4, the material level detection device 5, the material temperature detection device 6, the first gas temperature detection device 701, the second gas temperature detection device 702, the gas flow detection device 8, the particle size detection device 10, the fan 11, and the material flow detection device 12, and controls the operation of the corresponding devices.

[0116] Example 5

[0117] A method for monitoring and analyzing the cooling effect of an annular cooler involves unloading hot sintered ore from a sintering machine into an annular cooler. Cooling air is blown into the bottom of the annular cooler, and the hot sintered ore is cooled by the cooling air inside the cooler, resulting in cooled sintered ore. During the cooling process of hot sintered ore under historical operating conditions, the operating parameters of the annular cooler are measured and analyzed to fit a functional relationship between the gas-solid comprehensive heat transfer coefficient of the sintered ore and the cooling air on the annular cooler. This allows for the calculation of the expected unloading temperature of the annular cooler under current operating conditions, thus predicting the cooling effect of the annular cooler under the current conditions.

[0118] Example 6

[0119] A method for monitoring and analyzing the cooling effect of an annular cooler involves unloading hot sintered ore from a sintering machine into an annular cooler. Cooling air is blown into the bottom of the annular cooler, and the hot sintered ore is cooled by the cooling air inside the cooler, resulting in cooled sintered ore. During the cooling process of hot sintered ore under historical operating conditions, the operating parameters of the annular cooler are measured and analyzed to fit a functional relationship between the gas-solid comprehensive heat transfer coefficient of the sintered ore and the cooling air on the annular cooler. This allows for the calculation of the expected unloading temperature of the annular cooler under the current operating conditions, thus predicting the cooling effect of the annular cooler under the current conditions. The specific steps include:

[0120] S1. Historical data measurement and collection: The production parameters and heat exchange process parameters of the annular cooler under historical operating conditions are measured and collected.

[0121] S2. Historical Data Analysis and Processing: Along the running direction of the annular cooler trolley, the sintered ore layer on the annular cooler is divided into multiple sections. For each section, a heat balance between the sintered ore and the cooling air is established, thereby calculating the gas-solid integrated heat transfer coefficient of each section. This yields the gas-solid integrated heat transfer coefficient between the sintered ore and the cooling air on the annular cooler under different conditions.

[0122] S3. Fitting the functional relationship of the gas-solid integrated heat transfer coefficient: Based on the gas-solid integrated heat transfer coefficient of sinter and cooling air under different conditions obtained in step S2, fit the functional relationship of the gas-solid integrated heat transfer coefficient.

[0123] S4. Prediction of the cooling effect of the annular cooler: Based on the functional relationship of the gas-solid integrated heat transfer coefficient fitted in step S3, calculate the gas-solid integrated heat transfer coefficient between the sinter and the cooling air under the current operating conditions in the annular cooler. Then, based on the principle of heat balance, calculate the expected unloading temperature of the annular cooler during the material feeding stage, thereby predicting the cooling effect of the annular cooler.

[0124] Example 7

[0125] A method for monitoring and analyzing the cooling effect of an annular cooler, using the system described in Example 4, involves unloading hot sinter from the sintering machine into the annular cooler. Cooling air is blown into the bottom of the annular cooler, and the hot sinter is cooled by the cooling air inside the annular cooler, resulting in cooled sinter. During the cooling process of the hot sinter under historical operating conditions, by measuring and analyzing the operating parameters of the annular cooler, a functional relationship between the gas-solid comprehensive heat transfer coefficient of the sinter and the cooling air on the annular cooler is fitted, thereby calculating the expected unloading temperature of the annular cooler under the current operating conditions, and thus predicting the cooling effect of the annular cooler under the current operating conditions. Specifically, the method includes the following steps:

[0126] S1. Historical data measurement and collection: The production parameters and heat exchange process parameters of the annular cooler under historical operating conditions are measured and collected.

[0127] In step S1, the production parameters include the throughput of the annular cooler per unit time and the thickness of the material layer in the annular cooler. The heat exchange process parameters include the sinter feeding temperature, the sinter material layer distribution and particle size distribution, the sinter unloading temperature, the cooling air temperature and cooling air volume at the lower part of the sinter material layer at different locations, and the hot waste gas temperature at the upper part of the sinter material layer at different locations.

[0128] S2. Historical Data Analysis and Processing: Along the running direction of the annular cooler trolley, the sintered ore layer on the annular cooler is divided into multiple segments. For each segment, a heat balance is established between the sintered ore and the cooling air, thereby calculating the gas-solid integrated heat transfer coefficient for each segment. This yields the gas-solid integrated heat transfer coefficient between the sintered ore and the cooling air on the annular cooler under different conditions. Specifically:

[0129] Along the running direction of the annular cooler trolley, m=80 sets of temperature and flow measurement points are evenly set at corresponding positions above and below the material layer in the annular cooler. Using these temperature and flow measurement points as boundaries, the sintered ore layer on the annular cooler is evenly divided into 79 segments. For each segment, a heat balance equation between the sintered ore and the cooling air is established. That is:

[0130]

[0131]

[0132] in:

[0133]

[0134] In equations (1)-(3): The specific heat capacity of the cooling air. =1302 J / (m 3 ·℃). m is the cooling air volume of the i-th material layer on the annular cooler. 3 / s. The temperature of the hot exhaust gas at the upper part of the feed end of the i-th section of the ring cooler is ℃. The temperature of the hot exhaust gas above the discharge end of the i-th section of the annular cooler is ℃. The cooling air temperature at the bottom of the i-th section of the material layer on the annular cooler, in °C. Let be the gas-solid combined heat transfer coefficient of the i-th material layer in the annular cooler, W / (m²). 2 ·℃). C is the gas-solid heat exchange area of ​​each material layer on the annular cooler, in m². 2 ε is the porosity of the sintered ore layer on the annular cooler, ε = 0.41. D is the volume of sintered ore in each section of the annular cooler, D = length of each section × width of the trolley × thickness of the ore layer = 1.92 × 4 × 0.9637 = 7.401216 m³ 3 dp is the equivalent diameter of the sinter, dp = 0.0155 m. , is the initial temperature of the sinter in the i-th section of the ring cooler, in °C. The sintering temperature of the i-th section of the material layer in the annular cooler is ℃. The specific heat capacity of sintered ore, =850J / (kg·℃). B is the throughput of the annular cooler per unit time, B=903.18 t / h=250.88 kg / s.

[0135] Based on the above heat balance equation, combined with the cooling air volume, cooling air temperature, initial temperature of sinter, and final temperature of sinter under historical operating conditions measured and collected in step S1, as well as the hot exhaust gas temperature at the upper part of the feed end and the upper part of the discharge end of each material layer, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler is calculated. Thus, the gas-solid integrated heat transfer coefficient of sinter and cooling air on the annular cooler under different cooling air volume, cooling air temperature, initial temperature of sinter, and material layer thickness is obtained, as shown in Table 2 below.

[0136] Table 2. Gas-solid combined heat transfer coefficients of various material layers in the annular cooler under historical operating conditions.

[0137] S3. Fitting the functional relationship of the gas-solid integrated heat transfer coefficient: Based on the gas-solid integrated heat transfer coefficient of sinter and cooling air under different conditions obtained in step S2, fit the functional relationship of the gas-solid integrated heat transfer coefficient. That is:

[0138]

[0139] In equation (4): Let be the gas-solid combined heat transfer coefficient of the i-th material layer in the annular cooler, W / (m²). 2 ·℃). m is the cooling air volume of the i-th material layer on the annular cooler. 3 / s. The temperature of the cooling air at the bottom of the i-th section of the material layer on the annular cooler is ℃. is the initial temperature of the sinter in the i-th section of the annular cooler, in °C. h is the thickness of the material layer in the annular cooler, in meters. , , , , , All are adjustment coefficients, among which, =1 s / m 3 , =1 ℃ -1 , =1 ℃ -1 , =1 m -1 , =1 W / (m 2 ·℃), =1 W / (m 2 ·℃).

[0140] S4. Prediction of the cooling effect of the annular cooler: Based on the functional relationship of the gas-solid integrated heat transfer coefficient fitted in step S3, calculate the gas-solid integrated heat transfer coefficient between the sinter and the cooling air under the current operating conditions in the annular cooler. Then, based on the principle of heat balance, calculate the expected unloading temperature of the annular cooler during the material feeding stage, thereby predicting the cooling effect of the annular cooler. Specifically:

[0141] Based on the functional relationship (4) of the gas-solid integrated heat transfer coefficient fitted in step S3, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler under the current operating conditions is calculated. Then, based on the principle of heat balance and combined with the calculated gas-solid integrated heat transfer coefficient, the expected unloading temperature of the annular cooler is estimated during the material distribution stage. Wherein:

[0142]

[0143]

[0144] in:

[0145]

[0146] In equations (5)-(7): The specific heat capacity of the cooling air. =1302 J / (m 3 ·℃). The cooling air volume (m) for the j-th section of the material layer in the annular cooler under the current operating conditions. 3 / s. The temperature of the hot exhaust gas above the j-th section of the material layer on the annular cooler under the current operating conditions is ℃. The temperature of the cooling air at the bottom of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃. The specific heat capacity of sintered ore, =850 J / (kg·℃). B' is the throughput of the annular cooler per unit time under the current operating conditions, B'=1079.787t / h=299.941 kg / s. The initial ore temperature (°C) of the j-th section of the material layer on the annular cooler under the current operating conditions. The expected termination temperature of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃. The gas-solid combined heat transfer coefficient of the j-th section of the material bed in the annular cooler under the current operating conditions, in W / (m²). 2 ·℃). The gas-solid heat exchange area of ​​each material layer on the annular cooler under current operating conditions, in meters. 2 ε' is the porosity of the sintered ore layer on the annular cooler under the current operating conditions, ε'=0.40. D' is the volume of sintered ore in each section of the annular cooler under the current operating conditions, D'=length of each section × width of the trolley × thickness of the ore layer=1.92×4×1.0124=7.775232m³ 3 dp' is the equivalent diameter of the sinter under the current operating conditions, dp'=0.018m.

[0147] In the calculation process, firstly, the initial ore temperature of the first section of the material layer on the annular cooler under the current operating conditions is known. =742℃, cooling air temperature at the bottom of the first material layer =52℃, cooling air volume of the first material layer =10.8128 m 3 / s, the thickness of the material layer in the annular cooler is h=1.0124m. The gas-solid integrated heat transfer coefficient of the first section of the material layer in the annular cooler under the current operating conditions is calculated according to formula (4). =15.3302 W / (m 2 ·℃).

[0148] Then, based on the initial ore temperature of the first stage material layer on the annular cooler under the current operating conditions... Cooling air temperature at the bottom of the first material layer and cooling air volume By combining the above formulas (5)-(7), the expected termination temperature of the first stage material layer on the annular cooler can be calculated. =707.9284℃ and the temperature of the hot waste gas above the first stage material layer =669.1651℃.

[0149] Next, set the expected termination temperature of the first stage material layer on the annular cooler. The initial ore temperature of the second section of the material layer According to formula (4), the gas-solid integrated heat transfer coefficient of the second stage material layer on the annular cooler under the current operating conditions is obtained. =12.0962 W / (m 2 ·℃), and then the expected termination temperature of the second stage material layer on the annular cooler is calculated by formulas (5)-(7). =680.8699℃ and the temperature of the hot exhaust gas above the second stage material layer =609.3022℃. Then, the expected termination temperature of the second stage material layer on the annular cooler... The initial ore temperature of the third section of the material layer Calculate sequentially according to formulas (4)-(7) until the last section of the ring cooler, i.e., the 79th section of material layer, to obtain the expected unloading temperature T of the sinter on the ring cooler. s预计 = =135.5218℃, thus the expected unloading temperature of the annular cooler can be calculated during the material feeding stage. At the same time, the temperature distribution of hot exhaust gas in each material layer of the annular cooler can be obtained, further enabling the prediction of the cooling effect of the annular cooler. Among them, the iterative calculation process from the first material layer to the 79th material layer, the calculation results of some material layers are shown in Table 3 below.

[0150] Table 3. Expected unloading temperature and hot exhaust gas temperature distribution of each material layer in the annular cooler under current operating conditions.

[0151]

[0152] Example 8

[0153] Repeat Example 7, except that the method further includes:

[0154] S5. Circular Cooler Cooling Effect Control: Set the target unloading temperature of the circular cooler to T. s目标 =130℃, the expected unloading temperature of the annular cooler obtained in step S4 is T s预计=135.5218℃, calculate the absolute value of the difference between the expected unloading temperature and the target unloading temperature of the annular cooler, denoted as Δt. Where:

[0155]

[0156] Obviously, Δt≤10℃ indicates that the deviation between the expected unloading temperature and the target unloading temperature of the annular cooler is small and within a reasonable range. Therefore, the existing parameters should be maintained and the system should continue to operate.

[0157] Example 9

[0158] Repeat Example 7, except that the method further includes:

[0159] S5. Circular Cooler Cooling Effect Control: Set the target unloading temperature of the circular cooler to T. s目标 =120℃, the expected unloading temperature of the annular cooler obtained in step S4 is T s预计 =135.5218℃, calculate the absolute value of the difference between the expected unloading temperature and the target unloading temperature of the annular cooler, denoted as Δt. Where:

[0160]

[0161] Obviously, Δt > 10℃, indicating that the expected unloading temperature of the annular cooler deviates significantly from the target unloading temperature. Adjust the total air volume of all blowers into the annular cooler so that Δt ≤ 10℃.

Claims

1. A method for monitoring and analyzing the cooling effect of an annular cooler, wherein hot sinter is discharged from a sintering machine to an annular cooler, cooling air is blown into the bottom of the annular cooler, and the hot sinter is cooled by the cooling air inside the annular cooler, and cooled sinter is obtained after cooling is completed; characterized in that: During the cooling process of hot sintered ore under historical operating conditions, by measuring and analyzing the operating parameters of the annular cooler, a functional relationship between the gas-solid comprehensive heat transfer coefficient of the sintered ore and the cooling air on the annular cooler is fitted, thereby calculating the expected unloading temperature of the annular cooler under the current operating conditions and realizing the prediction of the cooling effect of the annular cooler.

2. The method according to claim 1, characterized in that: During the cooling process of hot sinter under historical operating conditions, the gas-solid comprehensive heat transfer coefficient between the sinter and the cooling air on the annular cooler is fitted by measuring and analyzing the operating parameters of the annular cooler, thereby calculating the expected unloading temperature of the annular cooler under the current operating conditions. The specific steps include: S1. Historical data measurement and collection: The production parameters and heat exchange process parameters of the annular cooler under historical operating conditions are measured and collected respectively; S2. Historical data analysis and processing: Along the running direction of the ring cooler trolley, the sintered ore layer on the ring cooler is divided into multiple sections. For each section, the heat balance between the sintered ore and the cooling air is established, and the gas-solid integrated heat transfer coefficient of each section is calculated. Thus, the gas-solid integrated heat transfer coefficient between the sintered ore and the cooling air on the ring cooler under different conditions is obtained. S3. Fitting the functional relationship of the gas-solid integrated heat transfer coefficient: Based on the gas-solid integrated heat transfer coefficient of sinter and cooling air under different conditions obtained in step S2, fit the functional relationship of the gas-solid integrated heat transfer coefficient. S4. Prediction of cooling effect of the ring cooler: Based on the functional relationship of the gas-solid integrated heat transfer coefficient fitted in step S3, calculate the gas-solid integrated heat transfer coefficient between the sinter and the cooling air under the current working conditions in the ring cooler; then, based on the principle of heat balance, calculate the expected unloading temperature of the ring cooler during the feeding stage of the ring cooler, thereby realizing the prediction of the cooling effect of the ring cooler.

3. The method according to claim 2, characterized in that: In step S1, the production parameters include the throughput of the ring cooler per unit time and the thickness of the ring cooler material layer; the heat exchange process parameters include the sintering material feeding temperature, the sintering material layer distribution and particle size distribution, the sintering material unloading temperature, the cooling air temperature and cooling air volume at the bottom of the sintering material layer at different locations, and the hot waste gas temperature at the top of the sintering material layer at different locations.

4. The method according to claim 2 or 3, characterized in that: Step S2 is as follows: Along the running direction of the ring cooler trolley, m sets of temperature measuring points and flow measuring points are evenly set at corresponding positions above and below the ring cooler material layer. Using these temperature measuring points and flow measuring points as the dividing line, the sinter material layer on the ring cooler is evenly divided into m-1 segments. For each segment, a heat balance equation between sinter and cooling air is established. That is: in: In equations (1)-(3): The specific heat capacity of the cooling air, J / (m³) 3 ·℃); m is the cooling air volume of the i-th material layer on the annular cooler. 3 / s; The temperature of the hot exhaust gas above the feed end of the i-th section of the annular cooler is ℃; The temperature of the hot exhaust gas above the discharge end of the i-th section of the material layer on the annular cooler is ℃; The cooling air temperature at the bottom of the i-th section of the material layer on the annular cooler, in °C; Let be the gas-solid combined heat transfer coefficient of the i-th material layer in the annular cooler, W / (m²). 2 ·℃); C is the gas-solid heat exchange area of ​​each material layer on the annular cooler, m 2 ε represents the porosity of the sintered ore bed in the annular cooler; D represents the volume of sintered ore in each section of the annular cooler, in m³. 3 dp is the equivalent diameter of the sinter, in meters. The initial temperature of the sinter in the i-th section of the ring cooler is ℃; The sintering temperature of the i-th section of the material layer in the annular cooler is ℃; denoted as sinter specific heat capacity, J / (kg·℃); B is the throughput of the annular cooler per unit time, kg / s. Based on the above heat balance equation, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler is calculated, thereby obtaining the gas-solid integrated heat transfer coefficient of sinter and cooling air on the annular cooler under different cooling air volume, cooling air temperature, initial temperature of sinter, and material layer thickness.

5. The method according to claim 4, characterized in that: Step S3 is as follows: Based on the gas-solid integrated heat transfer coefficients obtained in step S2 for sinter and cooling air under different cooling air volume, cooling air temperature, initial sinter temperature, and bed thickness, a functional relationship for the gas-solid integrated heat transfer coefficients is fitted; that is: In equation (4): Let be the gas-solid combined heat transfer coefficient of the i-th material layer in the annular cooler, W / (m²). 2 ·℃); m is the cooling air volume of the i-th material layer on the annular cooler. 3 / s; The temperature of the cooling air at the bottom of the i-th section of the material layer on the annular cooler is ℃; is the initial temperature of the sinter in the i-th section of the annular cooler, in °C; h is the thickness of the material layer in the annular cooler, in m; , , , , , All are adjustment coefficients, among which, The value range is 0.95~1.03 s / m 3 , The value range is 0.9~1.1 ℃ -1 , The value range is 0.9~1.06 ℃ -1 , The value range is 0.92~1.05 m. -1 , The value range is 0.99~1.01 W / (m 2 ·℃), The value range is 0.8~1.2 W / (m 2 ·℃).

6. The method according to claim 5, characterized in that: Step S4 is as follows: Based on the functional relationship (4) of the gas-solid integrated heat transfer coefficient fitted in step S3, the gas-solid integrated heat transfer coefficient of each material layer on the annular cooler under the current operating conditions is calculated; then, based on the principle of heat balance and combined with the calculated gas-solid integrated heat transfer coefficient, the expected unloading temperature of the annular cooler is estimated during the material distribution stage; where: in: In equations (5)-(7): The specific heat capacity of the cooling air, J / (m³) 3 ·℃); The cooling air volume (m) for the j-th section of the material layer in the annular cooler under the current operating conditions. 3 / s; The temperature of the hot exhaust gas above the j-th section of the material layer in the annular cooler under the current operating conditions is ℃; The temperature of the cooling air at the bottom of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃; B' represents the specific heat capacity of the sinter, in J / (kg·℃); B' represents the throughput of the annular cooler per unit time under the current operating conditions, in kg / s. The initial ore temperature of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃; The expected termination temperature of the j-th section of the material layer on the annular cooler under the current operating conditions is ℃; The gas-solid combined heat transfer coefficient of the j-th section of the material bed in the annular cooler under the current operating conditions, in W / (m²). 2 ·℃); The gas-solid heat exchange area of ​​each material layer on the annular cooler under current operating conditions, in meters. 2 ε' represents the porosity of the sintered ore bed in the annular cooler under the current operating conditions; D' represents the volume of sintered ore in each section of the annular cooler under the current operating conditions, in meters. 3 ;dp' is the equivalent diameter of the sinter under the current operating conditions, in meters; In the calculation process, the gas-solid integrated heat transfer coefficient of each section of the material layer on the annular cooler under the current working condition is first calculated according to formula (4); then, based on the initial ore temperature (i.e. sintering ore feeding temperature), the cooling air temperature and cooling air volume of the first section of the material layer on the annular cooler under the current working condition, the expected termination ore temperature of the first section of the material layer on the annular cooler and the hot exhaust gas temperature of the first section of the material layer are calculated by combining the above formulas (5)-(7); then, the expected termination ore temperature of the first section of the material layer on the annular cooler is used as the initial ore temperature of the second section of the material layer, and the calculation is carried out in sequence according to formulas (5)-(7) until the last section of the material layer on the annular cooler is calculated, so as to obtain the expected unloading temperature of the sintering ore on the annular cooler. Thus, the expected unloading temperature of the annular cooler is calculated at the material feeding stage of the annular cooler, and the hot exhaust gas temperature distribution of the annular cooler is obtained, so as to further realize the prediction of the cooling effect of the annular cooler.

7. The method according to any one of claims 2-6, characterized in that: The method also includes: S5. Circular Cooler Cooling Effect Control: Set the target unloading temperature of the circular cooler to T. s目标 The expected unloading temperature of the annular cooler obtained in step S4 is T. s预计 Calculate the absolute value of the difference between the expected unloading temperature and the target unloading temperature of the annular cooler, denoted as Δt; where: S501. If Δt > 10℃, it means that the expected unloading temperature of the annular cooler deviates significantly from the target unloading temperature. Adjust the total air volume of all blowers into the annular cooler so that Δt ≤ 10℃. S502. If Δt≤10℃, it means that the deviation between the expected unloading temperature and the target unloading temperature of the annular cooler is small and the deviation is within a reasonable range. Continue to operate with the existing parameters. As a preferred option, T s目标 The value range is 100~150℃, preferably 105~130℃.

8. A system for monitoring and analyzing the cooling effect of an annular cooler or a system for the method described in any one of claims 1-7, characterized in that: The system includes a sintering machine (1) and an annular cooler (2); the annular cooler (2) is located downstream of the sintering machine (1), and the two are connected by a discharge device; the tail section temperature identification device (3) is provided at the tail of the sintering machine (1); the material layer cross section scanning device (4) and the material level detection device (5) are provided at the feed inlet of the annular cooler (2); the material temperature detection device (6) is provided at the discharge outlet of the annular cooler (2); along the running direction of the trolley of the annular cooler (2), multiple sets of first gas temperature detection devices (701) are uniformly arranged above the material layer of the annular cooler (2), and correspondingly, multiple sets of second gas temperature detection devices (702) and gas flow detection devices (8) are uniformly arranged at the corresponding positions below the material layer of the annular cooler (2); the system also includes a granulation device (9) located downstream of the annular cooler (2), and the annular cooler (2) and the granulation device (9) are connected by a belt; a particle size detection device (10) is also provided on the belt.

9. The system according to claim 8, characterized in that: The bottom of the annular cooler (2) is equipped with multiple fans (11); the feed inlet of the annular cooler (2) is also equipped with a material flow detection device (12); and / or Multiple sets of the first gas temperature detection devices (701) are set at the same height above the material layer of the annular cooler (2); multiple sets of the second gas temperature detection devices (702) are set at the same height below the material layer of the annular cooler (2); multiple sets of the gas flow detection devices (8) are set at the same height below the material layer of the annular cooler (2).

10. The system according to claim 8 or 9, characterized in that: The system also includes a controller (13); the controller (13) is connected to the tail section temperature identification device (3), the material layer section scanning device (4), the material level detection device (5), the material temperature detection device (6), the first gas temperature detection device (701), the second gas temperature detection device (702), the gas flow detection device (8), the particle size detection device (10), the fan (11), and the material flow detection device (12), and controls the operation of the corresponding devices.

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