Energy-saving centrifugal fan control method for rock wool curing furnace production

Abstract

The application discloses an energy-saving centrifugal fan control method for rock wool curing furnace production, which comprises a conveying belt and a central controller. The conveying belt is used for conveying the pleated rock wool into the curing furnace. The central controller is used for acquiring the rock wool quality data, the rock wool temperature data, the resin quality data, the resin temperature data, the air inlet volume data, the air inlet temperature data, the air outlet volume data, the air outlet temperature data and the fan rotating speed. The central controller can control the frequency converter to control the rotating speed of the fan. The control method of the central controller comprises acquiring the pressure difference data and the air volume data of the rock wool during curing through the data values. In actual production, the product density value and the product feeding speed are preset. The heat value difference Delta K-air resistance closed loop provided in the central controller is used. Then, according to the rock wool density, the frequency converter is used to adjust the predetermined hot air volume output of the fan.

Description

Technical Field

[0001] The present invention relates to the field of rock wool production methods, and in particular to an energy-saving centrifugal fan control method for rock wool curing furnace production. Background Art

[0002] Rockwool is an inorganic exterior wall insulation material. It originated in Hawaii. After the first volcanic eruption, residents discovered strands of melted, soft rock on the ground. This is the first known rockwool fiber. The production process of rockwool simulates the natural process of the Hawaiian volcanic eruption. Rockwool products are made from high-quality basalt and dolomite as the main raw materials. After being melted at temperatures exceeding 1450°C, they are processed into fibers using a centrifuge at high speed. A certain amount of binder, dust-proof oil, and water-repellent are sprayed on the fibers. The fibers are then collected by a collector and processed using a pendulum method. After three-dimensional laying, the fibers are cured and cut to form rockwool products of varying specifications and uses.

[0003] In the specific production process, curing is an important step in the production of rock wool products. Its working principle is to put the finished rock wool products into the rock wool curing furnace for heating treatment, so that the rock wool fibers and the adhesive are cross-linked with each other and form a strong structure. Usually a boiler is used as the heat source, and a centrifugal fan is used to pass high-temperature hot air through the product to achieve the rock wool board or rock wool material.

[0004] The processing steps are insufficient in the following aspects:

[0005] 1. In the production process of rock wool, the curing effect has a significant impact on the quality of the product. The principle of the curing furnace is to use high-temperature hot air to penetrate the product, take away the moisture in the product, and quickly cure the phenolic resin. After the hot air penetrates the cotton board, it is reheated by the burner and recycled. At the same time, some hot air with high moisture content needs to be discharged, which is the "dehumidification" process. The dehumidified air is the waste gas of the curing furnace;

[0006] 2. However, in actual production, when producing products of different thicknesses and densities, the required hot air volume and temperature are also different;

[0007] The heat energy calculation of existing rock wool factories is generally to increase the hot air volume (in actual structure, the rock wool products themselves have a predetermined amount of heat, so simply increasing the hot air volume will lead to heat and wind redundancy), thereby realizing heat energy circulation. This often causes excessive hot air to enter the dehumidification air (that is, the hot air has redundancy, so the excess hot air will also enter the dehumidification air). This not only causes phenolic resin to be discharged into the atmosphere and cause pollution, but also increases the loss of natural gas in the boiler, and condenses in the air ducts or within the factory to form a large amount of oil pollution.

[0008] 3、The air volume and air pressure of the curing furnace fan also affect the forming structure of the rock wool product. Excessive air volume and air pressure will cause the surface flatness of the panel to decrease, and insufficient air volume and air pressure will reduce the curing effect of the adhesive, thereby affecting the product structure strength and the yield.

[0009] 4、The power of the curing furnace fan varies from tens of kilowatts to hundreds of kilowatts, and the energy consumption in the rock wool production process is relatively high, which affects the cost of rock wool products and the energy consumption of enterprises.

[0010] For example, the existing method, such as Chinese invention patent 202411450116.5, improves the efficiency of the centrifugal fan by reducing the air resistance, thereby avoiding the loss of heat energy.

[0011] Among the above-mentioned deficiencies, adjusting the speed of the curing furnace fan is the most direct and effective solution, but in actual production process, it is difficult to achieve reasonable working conditions by manually adjusting the speed of the fan and then adjusting the air volume and air pressure.

[0012] Therefore, in actual energy efficiency control, there are still limitations, so how to design a dynamic adjustment control system with good universality is the key to design. SUMMARY

[0013] The main purpose of the present application is to provide an energy-saving centrifugal fan control method for rock wool curing furnace production, which aims to realize precise control of hot air parameters through multi-parameter acquisition, and then realize the function of precise energy saving.

[0014] To achieve the above-mentioned purpose, the present application provides an energy-saving centrifugal fan control method for rock wool curing furnace production, comprising:

[0015] A conveyor belt is used to convey the pleated rock wool into the curing furnace, and the front end of the conveyor belt is provided with a resin flow meter and a furnace front sensor;

[0016] The furnace front sensor is used to acquire rock wool mass data and rock wool temperature data;

[0017] The resin flow meter is used to acquire resin mass data and resin temperature data;

[0018] The curing furnace comprises an upper air box and a lower air box, and the conveyor belt is arranged between the upper air box and the lower air box,

[0019] The lower air box is provided with an air inlet, and the air inlet is provided with an air inlet sensor, and the air inlet sensor is used to acquire air inlet volume data and air inlet temperature data;

[0020] The upper air box is provided with an air outlet, and the air outlet is provided with an air outlet sensor, and the air outlet sensor is used to acquire air outlet volume data and air outlet temperature data;

[0021] The air outlet is connected with a boiler, the boiler is connected with a fan, the fan is provided with a frequency converter, and the fan is used to deliver fluid to the air inlet and then apply high-temperature hot air to the rock wool to penetrate its structure;

[0022] A central controller is used to acquire rock wool quality data, rock wool temperature data, resin quality data, resin temperature data, air inlet volume data, air inlet temperature data, air outlet volume data, air outlet temperature data and fan speed, and the central controller can control the frequency converter to control the speed of the fan;

[0023] The control method using the central controller includes acquiring differential pressure data and air volume data of the rock wool during curing through data values;

[0024] The differential pressure control data includes:

[0025] The pressure difference of the inlet and outlet of the curing furnace fan = outlet pressure - internal resistance of the curing furnace - resistance of the rock wool product,

[0026] When the internal resistance of the curing furnace is constant, the resistance of the rock wool product is adapted to its density, the central controller controls the working frequency data of the frequency converter according to the pressure difference, and adjusts the hot air pressure output by the fan and obtains the air resistance closed-loop control data according to the density of the rock wool product;

[0027] The air volume control data includes:

[0028] It is determined that the curing of the rock wool product needs to absorb heat in the hot air to reach the target temperature,

[0029] In actual production, the product density value and the product feeding speed are preset, and then the heat value K1 required for the product to reach the target temperature is calculated;

[0030] The air inlet volume data, the air inlet temperature data, the air outlet volume data and the air outlet temperature data can be used to calculate the input heat value K2 of the curing furnace, the output heat value K3,

[0031] And then the heat loss K4 of the curing furnace itself is obtained,

[0032] Therefore, the product heat absorption value K1 = K2-K3-K4, and the heat value difference ΔK = K2-K3 between the inlet and outlet of the curing furnace; through the heat value difference ΔK-air resistance closed-loop control data provided in the central controller, the predetermined hot air volume output by the fan is adjusted according to the rock wool density through the frequency converter;

[0033] The dynamic adjustment module, in actual production, the air volume and air pressure output by the centrifugal fan at different speeds are not in a linear relationship;

[0034] The dynamic adjustment module sets the ΔK upper limit threshold and the ΔK lower limit threshold, and controls the frequency converter to adjust the wind pressure and air volume of the fan on the basis of ensuring the input calorific value K2 of the curing furnace;

[0035] The dynamic adjustment module adaptively adjusts the minimum value ΔK between the ΔK upper limit threshold and the ΔK lower limit threshold.

[0036] In actual control, the density of cotton rock in the same batch is constant, and the wind pressure and air volume required by the fan are preliminarily obtained based on the wind resistance closed-loop control data;

[0037] The wind resistance closed-loop control data can be obtained through the inlet air volume data and the outlet air volume data, and can be obtained by performing multiple tests on the same batch of cotton rock.

[0038] When the fan's wind pressure and air volume determine the initial value,

[0039] Since the fan operating points obtained from the pressure difference control data and the air volume control data do not coincide, the centralized controller is equipped with an optimization algorithm (dynamic adjustment module) that couples the output results of the pressure difference control data and the air volume control data, and optimizes towards the minimum fan power.

[0040] This effectively reduces the waste of output heat and at the same time effectively reduces boiler energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of the operation of the present invention;

[0042] Figure 2 This is the cotton rock production flow chart;

[0043] Figure 3 Schematic diagram of the curing oven;

[0044] Figure 4 This is the example working condition record table.

[0045] In the figure,

[0046] 1- Rockwool;

[0047] 2- Upper bellows;

[0048] 3-air outlet; 3a-air outlet sensor;

[0049] 4-lower bellows;

[0050] 5-air inlet; 5a-air inlet sensor;

[0051] 6- conveyor belt; 6a- furnace front sensor;

[0052] 7-Resin flow meter. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0055] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] like Figures 1 to 4 As shown, an energy-saving centrifugal fan control method for rock wool curing furnace production includes:

[0057] A conveyor belt is used to transport the pleated rock wool into the curing furnace. A resin flow meter and a furnace front sensor are provided at the front end of the conveyor belt;

[0058] The furnace front sensor is used to obtain rock wool quality data and rock wool temperature data;

[0059] The resin flow meter is used to obtain resin quality data and resin temperature data;

[0060] The curing oven includes an upper bellows and a lower bellows, and the conveyor belt is arranged between the upper bellows and the lower bellows.

[0061] The lower air box is provided with an air inlet, and the air inlet is provided with an air inlet sensor, and the air inlet sensor is used to obtain air inlet volume data and air inlet temperature data;

[0062] The upper wind box is provided with an air outlet, and the air outlet is provided with an air outlet sensor for acquiring air outlet air volume data and air outlet temperature data.

[0063] The air outlet is connected with a boiler, the boiler is connected with a fan, the fan is provided with a frequency converter, and the fan is used to deliver fluid to the air inlet to apply high-temperature hot air to the rock wool to penetrate its structure.

[0064] A central controller is used to acquire rock wool mass data, rock wool temperature data, resin mass data, resin temperature data, air inlet air volume data, air inlet temperature data, air outlet air volume data, air outlet temperature data and fan speed, and the central controller can control the frequency converter to control the speed of the fan.

[0065] The control method using the central controller includes acquiring pressure difference data and air volume data of the rock wool during curing through data values.

[0066] The pressure difference control data includes:

[0067] The pressure difference of the fan inlet and outlet of the curing furnace = outlet pressure - internal resistance of the curing furnace - resistance of the rock wool product,

[0068] When the internal resistance of the curing furnace is constant, the resistance of the rock wool product is adapted to its density, the central controller controls the working frequency data of the frequency converter according to the pressure difference, and adjusts the hot air pressure output by the fan according to the density of the rock wool product to obtain air resistance closed-loop control data.

[0069] That is, according to the continuously measured and calculated predetermined air resistance, the predetermined hot air pressure of the curing furnace is obtained, and then the pressure difference is adjusted according to different resistances.

[0070] The air volume control data includes:

[0071] The curing of the rock wool product needs to absorb heat in the hot air to reach the target temperature,

[0072] In actual production, the product density value and product feeding speed are preset, and then the heat value K1 required for the product to reach the target temperature is calculated.

[0073] The air inlet air volume data, the air inlet temperature data, the air outlet air volume data and the air outlet temperature data can be used to calculate the input heat value K2 of the curing furnace, the output heat value K3,

[0074] And the heat loss K4 of the curing furnace itself is obtained,

[0075] Therefore, the product heat absorption value K1 = K2-K3-K4, and the heat value difference ΔK between the inlet and outlet of the curing furnace = K2-K3; through the heat value difference ΔK-air resistance closed-loop control data provided in the central controller, the predetermined hot air volume output by the fan is adjusted according to the rock wool density through the frequency converter.

[0076] Dynamic adjustment module: In actual production, the air volume and air pressure output by the centrifugal fan at different speeds are not in a linear relationship;

[0077] The dynamic adjustment module sets the ΔK upper limit threshold and the ΔK lower limit threshold, and controls the frequency converter to adjust the wind pressure and air volume of the fan on the basis of ensuring the input calorific value K2 of the curing furnace;

[0078] The dynamic adjustment module adaptively adjusts the minimum value ΔK between the ΔK upper limit threshold and the ΔK lower limit threshold.

[0079] In actual control, the density of cotton rock in the same batch is constant, and the wind pressure and air volume required by the fan are preliminarily obtained based on the wind resistance closed-loop control data;

[0080] The wind resistance closed-loop control data can be obtained through the inlet air volume data and the outlet air volume data, and can be obtained by performing multiple tests on the same batch of cotton rock.

[0081] When the fan's wind pressure and air volume determine the initial value,

[0082] Since the fan operating points obtained from the pressure difference control data and the air volume control data do not coincide, the centralized controller is equipped with an optimization algorithm (dynamic adjustment module) that couples the output results of the pressure difference control data and the air volume control data, and optimizes towards the minimum fan power.

[0083] This effectively reduces the waste of output heat and at the same time effectively reduces boiler energy consumption.

[0084] Specifically, in the actual processing steps:

[0085] S1, rock wool passes through the furnace front sensor 6a, and obtains the initial parameters of rock wool T1, M1, C1;

[0086] After S2 and rock wool pass through the resin nozzle, they pass through the resin flow meter 7 to obtain the initial parameters of the resin T2, M2, and C2;

[0087] S3. After the rock wool enters the curing furnace, the input hot air parameters T3, M3, and C3 are obtained through the air inlet sensor 5a, and the output hot air parameters T4, M4, and C4 are obtained through the air outlet sensor 3a;

[0088] S4. Calculate K1 and K2 using the above formula;

[0089] S5. The centralized controller of the present invention compares the values ​​of K1 and K2, adjusts the fan frequency 8 to control M3, and records the adjusted K1 and K2 into the database;

[0090] in;

[0091] Rock wool temperature-T1

[0092] Rockwool quality-M1

[0093] Rock wool specific heat capacity-C1

[0094] Resin temperature-T2

[0095] Resin quality-T3

[0096] Resin specific heat capacity-C2

[0097] Inlet air temperature-T3

[0098] Air intake quality-M3

[0099] Inlet air specific heat capacity-C3

[0100] Air outlet temperature-T4

[0101] Air quality-M4

[0102] Outlet specific heat capacity-C4

[0103] Heat required for rock wool curing K1

[0104] The curing furnace input calorific value K2.

[0105] Specifically, the calorific value required for the product to reach the target temperature is K1 = (250°C - T1) * M1 * C1 + (250°C - T2) * M2 * C2;

[0106] The curing furnace input calorific value K2 = T3*M3*C3 - T4*M4*C4.

[0107] Specifically, in a single production process, T1, T2, T3, M1, M2, C1, and C2 are considered constants, and K2 can be adjusted to K1 by controlling the fan frequency conversion to adjust M3 and M4;

[0108] The dynamic adjustment module is used to adjust the minimum value ΔK between the input calorific value K2 of the curing furnace and the heat required for rock wool curing K1, thereby controlling and reducing the fan power and boiler power.

[0109] Specifically, in the actual continuous production process, the centralized controller continuously obtains the variables T1, T2, T3, M1, M2, C1, and C2 sent back by the sensor.

[0110] The centralized controller stores and analyzes the data of continuous production to obtain the minimum value ΔK between K2→K1, thereby optimizing energy consumption in continuous production and achieving energy efficiency control.

[0111] Specifically, the dynamic adjustment module implements energy-saving control through the following process:

[0112] Real-time monitoring: Continuously detect the heat difference between the inlet and outlet of the curing furnace ΔK=K2-K3.

[0113] Specifically, threshold protection:

[0114] 2.1. When ΔK>ΔKmax exceeds the upper limit (heat waste), the fan speed is automatically increased to increase the hot air penetration to reduce ΔK;

[0115] 2.2. When ΔK<ΔKmax is lower than the lower limit (insufficient heat), the fan speed is automatically lowered to reduce heat input to increase ΔK.

[0116] Specifically,

[0117] Interval optimization: When ΔK is within a safe range, the module takes the current frequency as the center and, through a "probe-compare-adjust" closed-loop strategy, gradually approaches the fan speed that minimizes ΔK, ultimately reaching a stable state with the lowest energy consumption.

[0118] Example:

[0119] If the current ΔK=1200kJ and ΔKmax=1000kJ is set, the module automatically increases the fan frequency until ΔK≤1000kJ; then, within the range of 800kJ≤ΔK≤1000kJ, the module fine-tunes the frequency multiple times to find the lowest energy consumption point of ΔK=820kJ and maintain operation.

[0120] in Figure 4 This is one of the specific embodiments. The first to fifth optimizations in the table represent five operating condition records of the fan described in the present invention according to the above algorithm and control method during the continuous rock wool curing production process. During the continuous production process, the unit mass density of the rock wool products is basically the same.

[0121] After five optimization cycles since startup, the difference between the heat output of the curing furnace and the heat absorbed by the rock wool products has gradually decreased from 34.82% to approximately 18%. Due to the minimum calorific value difference detection range, the control system stopped interfering with the fan operation after the third optimization cycle. For ease of understanding, the hot air volume is corrected by taking the average of the inlet and outlet air volumes, and the specific heat capacity is calculated as a constant.

[0122] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for controlling an energy-saving centrifugal fan in a rock wool curing furnace, characterized in that: include: A conveyor belt is used to transport the pleated rock wool into the curing furnace. A resin flow meter and a furnace front sensor are provided at the front end of the conveyor belt; The furnace front sensor is used to obtain rock wool quality data and rock wool temperature data; The resin flow meter is used to obtain resin quality data and resin temperature data; The curing oven includes an upper bellows and a lower bellows, and the conveyor belt is arranged between the upper bellows and the lower bellows. The lower air box is provided with an air inlet, and the air inlet is provided with an air inlet sensor, and the air inlet sensor is used to obtain air inlet volume data and air inlet temperature data; The upper air box is provided with an air outlet, and the air outlet is provided with an air outlet sensor, and the air outlet sensor is used to obtain air volume data and air temperature data; The air outlet is connected to a boiler, the boiler is connected to a fan, the fan is provided with a frequency converter, and the fan is used to transport the fluid to the air inlet and then apply high-temperature hot air to the cotton rock to penetrate its structure; A centralized controller, which is used to obtain rock wool quality data, rock wool temperature data, resin quality data, resin temperature data, inlet air volume data, inlet air temperature data, outlet air volume data, outlet air temperature data, and fan speed. The centralized controller can control the frequency converter to control the fan speed; The control method using the centralized controller includes obtaining the pressure difference data and air volume data of the cotton rock during solidification through data values; The pressure difference data includes: The pressure difference between the inlet and outlet of the curing furnace fan = outlet pressure - resistance inside the curing furnace - resistance of rock wool products. When the resistance in the curing furnace is constant, the resistance of the rock wool product is suitable for its density. The centralized controller controls the operating frequency data of the inverter according to the pressure difference, and adjusts the hot air pressure output by the fan according to the density of the rock wool product to obtain the wind resistance closed-loop control data. The air volume data includes: Determine that the curing of rock wool products needs to absorb the heat from the hot air to reach the target temperature, During actual production, the product density value and product feeding speed are preset, and then the calorific value K1 required for the product to reach the target temperature is calculated; The input calorific value K2 and output calorific value K3 of the curing furnace can be calculated through the inlet air volume data, inlet air temperature data, outlet air volume data and outlet air temperature data. Then we can get the heat loss K4 of the curing furnace itself. Therefore, the product absorption calorific value K1 = K2-K3-K4, and the calorific value difference between the inlet and outlet of the curing furnace ΔK = K2-K3; through the calorific value difference ΔK-wind resistance closed-loop control data set in the centralized controller, the fan output predetermined hot air volume is adjusted through the inverter according to the rock wool density; Dynamic adjustment module: In actual production, the air volume and air pressure output by the centrifugal fan at different speeds are not in a linear relationship; The dynamic adjustment module sets the ΔK upper limit threshold and the ΔK lower limit threshold, and controls the frequency converter to adjust the wind pressure and air volume of the fan on the basis of ensuring the input calorific value K2 of the curing furnace; The dynamic adjustment module adaptively adjusts the minimum value ΔK between the ΔK upper limit threshold and the ΔK lower limit threshold.

2. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 1, characterized in that: In the actual processing steps: S1 and rock wool pass through the furnace front sensor (6a) to obtain the initial parameters of rock wool T1, M1, C1; After S2 and rock wool pass through the resin nozzle, they pass through the resin flow meter (7) to obtain the initial parameters of the resin T2, M2, and C2; S3, after the rock wool enters the curing furnace, the input hot air parameters T3, M3, C3 are obtained through the air inlet sensor (5a), and the output hot air parameters T4, M4, C4 are obtained through the air outlet sensor 3a; S4. Calculate K1=K2-K3-K4 to obtain K1 and K2; S5. The centralized controller compares K1 and K2, adjusts the fan frequency M3, and records the adjusted K1 and K2 into the database; in; Rock wool temperature-T1 Rockwool quality-M1 Rock wool specific heat capacity-C1 Resin temperature-T2 Resin quality-T3 Resin specific heat capacity-C2 Inlet air temperature-T3 Air intake quality-M3 Inlet air specific heat capacity-C3 Air outlet temperature-T4 Air quality-M4 Outlet specific heat capacity-C4 Heat required for rock wool curing K1 The curing furnace input calorific value K2.

3. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 2, characterized in that: The calorific value required for the product to reach the target temperature is K1=(250℃-T1)*M1*C1+(250℃-T2)*M2*C2; The input calorific value of the curing furnace is K2=T3*M3*C3-T4*M4*C4.

4. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 3, characterized in that: In a single production process, T1, T2, T3, M1, M2, C1, and C2 are considered constants. By controlling the fan frequency conversion and adjusting M3 and M4, K2 can be adjusted to K1. The dynamic adjustment module is used to adjust the minimum value ΔK between the input calorific value K2 of the curing furnace and the heat required for rock wool curing K1, thereby controlling and reducing the fan power and boiler power.

5. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 3, characterized in that: In the actual continuous production process, the centralized controller continuously obtains the variables T1, T2, T3, M1, M2, C1, and C2 sent back by the sensor. The centralized controller stores and analyzes the continuously produced data to obtain the minimum value ΔK between K2→K1.

6. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 5, characterized in that: The dynamic adjustment module implements energy-saving control through the following process: Real-time monitoring: Continuously detect the heat difference ΔK=K2−K3 between the inlet and outlet of the curing furnace.

7. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 6, characterized in that: Threshold protection: 2.

1. When ΔK>ΔKmax exceeds the upper limit, the fan speed is automatically increased to increase the hot air penetration to reduce ΔK; 2.

2. When ΔK<ΔKmax is lower than the lower limit, the fan speed is automatically reduced to reduce heat input to increase ΔK.

8. The energy-saving centrifugal fan control method for rock wool curing furnace production according to claim 7, characterized in that: Interval optimization: When ΔK is within the safe range, the module takes the current frequency as the center, Through the closed-loop strategy of "trial-comparison-adjustment", the fan speed that minimizes ΔK is gradually approached, and finally a stable state with the lowest energy consumption is achieved.

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