Energy-saving method and device for large fan with air pressure and dust removal level distribution of air volume

Abstract

The embodiment of the present application provides a large fan energy-saving method and device for distributing air volume according to wind pressure and dust removal grade, and the method comprises the following steps: for each dust removal point driven by a fan, adjusting a dust removal valve corresponding to the dust removal point, so that the wind pressure value at the dust removal point is a preset negative pressure value corresponding to the dust removal point, and taking the opening percentage of the dust removal valve corresponding to the dust removal point at this time as a target opening percentage corresponding to the dust removal point; for each dust removal point, determining the number of dust removal grades corresponding to the dust removal point according to the target opening percentage corresponding to the dust removal point and the number of unit opening percentage dust removal grades corresponding to the dust removal point; summing the number of dust removal grades corresponding to all dust removal points to obtain the total number of dust removal grades corresponding to the fan; and determining the target rotating speed of the fan according to the total number of dust removal grades corresponding to the fan.

Description

Technical Field

[0001] This invention relates to the field of energy saving for large dust removal fans in steel plants, and particularly to a method and apparatus for energy saving of large fans by distributing air volume according to wind pressure and dust removal level. Background Technology

[0002] The steel plant has 10 large environmental dust collection fans with a total power of 29,250 kW. When production is not at full capacity, the excessively high fan speeds waste a significant amount of electricity, indicating a large potential for energy conservation. The existing frequency conversion energy-saving technology for these dust collection fans is relatively outdated. During production breaks, energy saving is achieved through simple operating conditions and interlocking of dust collection valves, or manual speed reduction, resulting in high fan power consumption.

[0003] In the process of developing this invention, the applicant discovered at least the following problems in the prior art:

[0004] How to achieve precise airflow distribution and reasonable and accurate control of fan speed in order to reduce energy consumption. Summary of the Invention

[0005] This invention provides a method and apparatus for energy saving of large fans by allocating air volume using wind pressure and dust removal level, which solves the problem of how to achieve precise air volume allocation and reasonable and precise control of fan speed to reduce energy consumption.

[0006] To achieve the above objectives, in one aspect, embodiments of the present invention provide an energy-saving method for large fans that allocates air volume based on wind pressure and dust removal level, comprising:

[0007] For each dust removal point driven by the fan, adjust the dust removal valve corresponding to the dust removal point so that the wind pressure at the dust removal point is the preset negative pressure value corresponding to the dust removal point, and take the opening percentage of the dust removal valve corresponding to the dust removal point at this time as the target opening percentage corresponding to the dust removal point.

[0008] For each dust removal point, the number of dust removal levels corresponding to the dust removal point is determined based on the target opening percentage corresponding to the dust removal point and the number of dust removal levels per unit opening percentage corresponding to the dust removal point.

[0009] Sum the number of dust removal levels corresponding to all dust removal points to obtain the total number of dust removal levels corresponding to the fan.

[0010] The target rotational speed of the fan is determined based on the total number of dust removal grades corresponding to the fan.

[0011] The dust removal grade serves as the smallest unit of measurement for allocating fan speed. The number of dust removal grades per unit opening percentage represents the number of dust removal grades corresponding to each 1% opening of the dust removal valve. The number of dust removal grades per unit opening percentage for each dust removal point is predetermined based on the pipe diameter of the dust removal valve corresponding to that point. The fan is connected to at least one dust removal pipe, and each dust removal pipe is connected to at least one dust removal point. A dust removal valve corresponding to each dust removal point is installed at each dust removal point, and a pressure sensor corresponding to the dust removal point is installed on the side of each dust removal valve connected to the fan. The preset negative pressure value corresponding to the dust removal point is the air pressure value corresponding to the air volume required for the dust removal point to operate normally.

[0012] On the other hand, embodiments of the present invention provide a large-scale fan energy-saving device that distributes air volume using wind pressure and dust removal level, comprising:

[0013] The target opening adjustment unit is used to adjust the dust removal valve corresponding to each dust removal point driven by the fan, so that the wind pressure at the dust removal point is the preset negative pressure value corresponding to the dust removal point, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage corresponding to the dust removal point.

[0014] The dust removal point dust removal level quantity determination unit is used to determine the number of dust removal levels corresponding to each dust removal point based on the target opening percentage corresponding to the dust removal point and the number of dust removal levels per unit opening percentage corresponding to the dust removal point.

[0015] The total dust removal level determination unit is used to sum the number of dust removal levels corresponding to all dust removal points to obtain the total number of dust removal levels corresponding to the fan.

[0016] The target speed determination unit is used to determine the target speed of the fan based on the total number of dust removal grades corresponding to the fan.

[0017] The dust removal grade serves as the smallest unit of measurement for allocating fan speed. The number of dust removal grades per unit opening percentage represents the number of dust removal grades corresponding to each 1% opening of the dust removal valve. The number of dust removal grades per unit opening percentage for each dust removal point is predetermined based on the pipe diameter of the dust removal valve corresponding to that point. The fan is connected to at least one dust removal pipe, and each dust removal pipe is connected to at least one dust removal point. A dust removal valve corresponding to each dust removal point is installed at each dust removal point, and a pressure sensor corresponding to the dust removal point is installed on the side of each dust removal valve connected to the fan. The preset negative pressure value corresponding to the dust removal point is the air pressure value corresponding to the air volume required for the dust removal point to operate normally.

[0018] The above technical solution has the following beneficial effects: By finely dividing the fan speed into dust removal levels, determining the opening degree of the dust removal valve at each dust removal point according to the required negative pressure value, and thus determining the dust removal level of each dust removal point, the total dust removal level is obtained. Based on the fan speed determined from the dust removal level, the opening degree of the dust removal valve and the speed of the dust removal fan are precisely controlled. Compared with the control methods of existing technologies, this reduces dust removal power consumption by more than 20%. The opening degree of the dust removal valve at each dust removal point is accurately set according to the negative pressure value corresponding to the airflow requirement, ensuring that the actual airflow at that dust removal point matches the airflow requirement. This avoids problems frequently encountered in existing technologies, such as electric dust removal valve failure, dust removal pipeline blockage due to airflow mismatch, and filter bag blockage caused by excessively high dust collector pressure differential. Therefore, the technical solution of this invention only requires periodic maintenance of the pressure sensor and the dust removal valve actuator, greatly reducing the maintenance workload of the dust removal system. By improving the dust removal level, the rationality and accuracy of air volume distribution at each dust removal point are enhanced, allowing the limited air volume to be rationally allocated to each dust removal point, thereby improving the dust removal effect. Intelligent means are used to achieve precise control of fan speed and air volume. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a method for energy saving of large fans by allocating air volume based on wind pressure and dust removal level, one of the embodiments of the present invention;

[0021] Figure 2 This is a schematic diagram of a large-scale fan energy-saving device that distributes air volume based on wind pressure and dust removal level, one of the embodiments of the present invention;

[0022] Figure 3 This is a schematic diagram illustrating the relative positional logic of a fan, a dust removal valve, and a pressure sensor, according to one embodiment of the present invention.

[0023] The attached diagram is labeled as follows: 1. PLC controller; 2. Fan; 3. Pressure sensor; 4. Dust removal valve; 5. Dust removal pipeline. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] On the one hand, such as Figure 1 As shown, this embodiment of the invention provides an energy-saving method for large fans that allocates air volume based on wind pressure and dust removal level, including:

[0026] Step S10: For each dust removal point driven by the fan, adjust the dust removal valve corresponding to the dust removal point so that the wind pressure at the dust removal point is the preset negative pressure value corresponding to the dust removal point, and take the opening percentage of the dust removal valve corresponding to the dust removal point at this time as the target opening percentage corresponding to the dust removal point.

[0027] Step S11: For each dust removal point, determine the number of dust removal levels corresponding to the dust removal point based on the target opening percentage corresponding to the dust removal point and the number of dust removal levels per unit opening percentage corresponding to the dust removal point.

[0028] Step S12: Sum the number of dust removal levels corresponding to all dust removal points to obtain the total number of dust removal levels corresponding to the fan;

[0029] Step S13: Determine the target rotational speed of the fan based on the total number of dust removal levels corresponding to the fan;

[0030] The dust removal grade serves as the smallest unit of measurement for allocating fan speed. The number of dust removal grades per unit opening percentage represents the number of dust removal grades corresponding to each 1% opening of the dust removal valve. The number of dust removal grades per unit opening percentage for each dust removal point is predetermined based on the pipe diameter of the dust removal valve corresponding to that point. The fan is connected to at least one dust removal pipe, and each dust removal pipe is connected to at least one dust removal point. A dust removal valve corresponding to each dust removal point is installed at each dust removal point, and a pressure sensor corresponding to the dust removal point is installed on the side of each dust removal valve connected to the fan. The preset negative pressure value corresponding to the dust removal point is the air pressure value corresponding to the air volume required for the dust removal point to operate normally.

[0031] In some embodiments, in some dust collection systems, a fan can drive one or more dust collection points. For each dust collection point, a preset negative pressure value is determined based on the air pressure value corresponding to the air volume required for normal operation. The target opening percentage of the dust collection valve corresponding to that dust collection point is then determined based on the preset negative pressure value. This allows the opening of the dust collection valve at each dust collection point to be set to an optimal level, neither too large nor too small. The fan drives one or more dust collection ducts, each connecting to one or more dust collection points. Each dust collection point is equipped with a corresponding dust collection valve, and the pipe diameters of the various dust collection valves can be the same or different. The number of dust removal grades per unit opening percentage for each dust removal point is determined based on the pipe diameter of the dust removal valve. For example, for a large-diameter dust removal valve with a large air volume requirement, each 1% opening corresponds to 5 dust removal grades; for a medium-diameter dust removal valve, each 1% opening corresponds to 3 dust removal grades; for a small-diameter dust removal valve, each 1% opening corresponds to 1 dust removal grade, and so on. Based on the target opening percentage and the number of dust removal grades per unit opening percentage for each dust removal point, the number of dust removal grades corresponding to that point is determined. The total number of dust removal grades for all dust removal points is then summed to obtain the total number of dust removal grades for the fan. Finally, the target speed of the fan is determined based on the total number of dust removal grades for the fan. Figure 3 This diagram illustrates the relative positions and logical relationships of the fan, dust collection valve, and pressure sensor. It also represents the architecture of a specific embodiment of a PLC-based dust collection system. The system utilizes a pressure sensor (electronic pressure gauge), adjustable-opening dust collection valves, and a PLC system for data acquisition and interlocking. Energy-saving control is implemented for complex dust collection conditions. The system includes a PLC controller 1, a fan 2, and a fan driving multiple dust collection pipes 5. Each pipe 5 connects to a dust collection point, and each point is equipped with a pressure sensor 3 and a dust collection valve 4. Because some dust collection points, such as those for molten iron mixing and primary refining, have flue gas temperatures exceeding 900℃ and 500℃ respectively, placing the pressure sensor at the front end of the pipe would significantly reduce its lifespan, affecting detection accuracy and stability. Therefore, the pressure sensor 3 (pressure gauge) is placed before the dust collection valve 4, but away from the high-temperature operating conditions. By connecting to a PLC system, the wind pressure value (pressure value) of the pressure sensor is collected in real time, and the opening percentage of the dust removal valve is tracked and the opening degree of the dust removal valve is controlled to realize the embodiment of the present invention, so as to achieve automatic control. According to the opening percentage of the dust removal valve at each dust removal point, a dust removal level rule is compiled. A certain opening percentage of a certain dust removal valve can accurately correspond to a certain number of dust removal levels. The number of dust removal levels represents the approximate air volume requirement through the dust removal valve at this valve opening. The fan speed interlock relationship corresponding to the sum of the dust removal levels of the dust removal system is pre-compiled.

[0032] The embodiments of this invention have the following technical effects: By finely dividing the fan speed into dust removal levels, and determining the opening degree of the dust removal valve at each dust removal point according to the required negative pressure value, the dust removal level of each dust removal point is determined, thus obtaining the total dust removal level. Based on the fan speed determined from the dust removal level, the opening degree of the dust removal valve and the speed of the dust removal fan are precisely controlled. Compared with the control methods of existing technologies, this reduces dust removal power consumption by more than 20%. The opening degree of the dust removal valve at each dust removal point is accurately set according to the negative pressure value corresponding to the air volume requirement, ensuring that the actual air volume at that dust removal point matches the air volume requirement. This avoids problems frequently encountered in existing technologies, such as electric dust removal valve failure, dust removal pipeline blockage due to air volume mismatch, and filter bag blockage caused by excessively high dust collector pressure differential. Therefore, the technical solution of this invention only requires periodic maintenance of the pressure sensor and dust removal valve actuator, greatly reducing the maintenance workload of the dust removal system. By improving the dust removal level, the rationality and accuracy of the air volume distribution at each dust removal point are improved, allowing the limited air volume to be rationally allocated to each dust removal point, thereby improving the dust removal effect.

[0033] Furthermore, for each dust removal point, in advance, under the working state of the dust removal point, the pressure sensor corresponding to the dust removal point is used to monitor the wind pressure value required for the smoke and dust passing through the dust removal point to stay at the dust removal point for two seconds, and the obtained wind pressure value is used as the preset negative pressure value corresponding to the dust removal point.

[0034] In some embodiments, the smoke and dust are drawn away after only about two seconds at the suction port. This indicates that the negative pressure is appropriate, neither too high nor too low. For example, if the smoke and dust that just emerged only stays at the suction port for half a second, it means that the suction is too strong and wastes power. If it stays for more than three seconds, it means that the suction is not strong enough, which may lead to the accumulation of smoke and dust and eventually overflowing the suction hood, causing environmental pollution.

[0035] The embodiments of this invention have the following technical effects: Accurately setting the required wind pressure value (i.e., the preset negative pressure value) for each dust removal point, and accurately setting the opening degree of the dust removal valve at each dust removal point according to the negative pressure value corresponding to the airflow demand, ensures that the actual airflow at each dust removal point matches the airflow demand. This avoids problems frequently encountered in existing technologies, such as electric dust removal valve failure, dust removal pipeline blockage due to airflow mismatch, and filter bag blockage caused by excessively high dust collector pressure differential. Therefore, the technical solution of this invention only requires periodic maintenance of the pressure sensor and dust removal valve actuator, greatly reducing the maintenance workload of the dust removal system. The accurately set preset negative pressure value yields the dust removal valve opening percentage that accurately matches the airflow demand, and thus the dust removal level that accurately matches the airflow demand. Finally, the dust removal level improves the rationality and accuracy of airflow distribution at each dust removal point, allowing limited airflow to be rationally allocated to each dust removal point, thereby improving the dust removal effect.

[0036] Further, for each dust removal point driven by the fan, adjusting the dust removal valve corresponding to the dust removal point so that the wind pressure at the dust removal point is a preset negative pressure value corresponding to the dust removal point, and taking the opening percentage of the dust removal valve corresponding to the dust removal point at this time as the target opening percentage corresponding to the dust removal point, includes:

[0037] For each dust removal point, the pressure sensor corresponding to the dust removal point is used to collect the wind pressure value of the dust removal point;

[0038] If the wind pressure value at the dust removal point is not within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value at the dust removal point is greater than the preset negative pressure value corresponding to the dust removal point, then the opening of the dust removal valve corresponding to the dust removal point is increased periodically at a preset time interval by a preset opening step value, and the wind pressure value at the dust removal point is monitored by the pressure sensor corresponding to the dust removal point until the wind pressure value at the dust removal point is within the specified deviation range of the preset negative pressure value corresponding to the dust removal point. Then the adjustment of the dust removal valve corresponding to the dust removal point is stopped, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage of the dust removal point.

[0039] If the wind pressure value at the dust removal point is not within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value at the dust removal point is less than the preset negative pressure value corresponding to the dust removal point, then the opening of the dust removal valve corresponding to the dust removal point is reduced periodically at a preset time interval according to a preset opening step value, and the wind pressure value at the dust removal point is monitored by the pressure sensor corresponding to the dust removal point until the wind pressure value at the dust removal point is within the specified deviation range of the preset negative pressure value corresponding to the dust removal point. Then, the adjustment of the dust removal valve corresponding to the dust removal point is stopped, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage of the dust removal point.

[0040] In some embodiments, the opening degree of the dust removal valve is set more accurately by adjusting it in small steps multiple times. For example, the dust removal valve and the corresponding pressure sensor (pressure gauge) are interlocked. Each dust removal valve is set with a unique preset negative pressure value. When the wind pressure value (pressure value or negative pressure value) detected by the pressure sensor corresponding to the dust removal valve is higher than the preset negative pressure value, the valve opens by 5% every 5 seconds (equivalent to a preset time interval). When the wind pressure value (pressure value or negative pressure value) detected by the pressure sensor is lower than the preset negative pressure value, the valve closes by 5% every 5 seconds (equivalent to a preset time interval). This continues until the deviation between the wind pressure value (measured negative pressure value) at the dust removal point and the preset negative pressure value is within 10% (a specified deviation neighborhood). At this point, the dust removal valve stops moving, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage for the dust removal point.

[0041] The embodiments of the present invention have the following technical effects: by adjusting the dust removal valves in small steps and multiple times, the opening percentage of the dust removal valves can be set accurately in a simple way. By combining the number of dust removal levels per unit opening percentage of each dust removal valve, the number of dust removal levels at each dust removal point can be accurately determined. In this way, the allocation of air volume to each dust removal point is improved through the dust removal level, so that the limited air volume can be reasonably allocated to each dust removal point, thereby improving the dust removal effect.

[0042] Furthermore, for each dust removal point, the number of dust removal levels corresponding to the dust removal point is determined based on the target opening percentage and the number of dust removal levels per unit opening percentage, including:

[0043] For each dust removal point, the target opening percentage corresponding to the dust removal point is multiplied by the number of dust removal levels per unit opening percentage corresponding to the dust removal point to obtain the number of dust removal levels corresponding to the dust removal point.

[0044] In some embodiments, the number of dust removal levels per unit opening percentage corresponding to a dust removal point is set separately according to the pipe diameter of the dust removal valve corresponding to the dust removal point. This allows for the independent setting of the number of dust removal levels for each dust removal point based on its different operating conditions. The settings for each dust removal point are independent of each other and do not affect each other, thus increasing the flexibility and accuracy of the system.

[0045] Further, determining the target rotational speed of the fan based on the total number of dust removal levels corresponding to the fan includes:

[0046] Based on the total number of dust removal levels corresponding to the fan and the pre-set matching relationship between the number of dust removal levels and the fan speed, the fan speed corresponding to the total number of dust removal levels is determined as the target speed of the fan.

[0047] In some embodiments, after determining the number of dust removal levels corresponding to each dust removal point in the dust removal system, it is necessary to determine the total number of dust removal levels required for the entire dust removal system, i.e., the total number of dust removal levels corresponding to the fan. A matching relationship between the total number of dust removal levels and the fan speed is pre-established. Based on the pre-established matching relationship and the total number of dust removal levels corresponding to the fan, the required fan speed can be determined. The matching relationship between the number of dust removal levels and the fan speed can be set using a table of dust removal levels and fan speed, or it can be set as a specified function. When the working state of a dust removal point changes, the number of dust removal levels corresponding to that point will also change, which in turn will cause a change in the total number of dust removal levels corresponding to the fan. Through the pre-established matching relationship, the fan speed is ultimately adjusted. Preferably, the matching relationship between the number of dust removal levels and the fan speed specifically involves dividing the range of the total number of dust removal levels into multiple consecutive dust removal level segments, and setting a corresponding fan speed for each dust removal level segment. Below is a specific example of the matching relationship between the number of dust removal grades and the fan speed. Based on the following interlocking logic, the fan speed for different dust removal grades is determined as follows: Condition 1, with a total number of dust removal grades between 0 and 5, the fan speed is 400 rpm; Condition 2, with a total number of dust removal grades between 6 and 10, the fan speed is 500 rpm; Condition 3, with a total number of dust removal grades between 11 and 20, the fan speed is 600 rpm; Condition 4, with a total number of dust removal grades between 21 and 35, the fan speed is 660 rpm.

[0048] The embodiments of the present invention have the following technical effects: by dividing the fan speed into fine-grained segments according to the dust removal level, the air volume required by the dust removal system can be assessed more accurately and reasonably, thereby determining the required fan speed more accurately and reasonably.

[0049] On the other hand, such as Figure 2 As shown, this embodiment of the invention provides a large-scale fan energy-saving device that distributes air volume based on wind pressure and dust removal level, comprising:

[0050] The target opening adjustment unit 200 is used to adjust the dust removal valve corresponding to each dust removal point driven by the fan, so that the wind pressure at the dust removal point is the preset negative pressure value corresponding to the dust removal point, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage corresponding to the dust removal point.

[0051] The dust removal point dust removal level determination unit 201 is used to determine the number of dust removal levels corresponding to each dust removal point based on the target opening percentage corresponding to the dust removal point and the number of dust removal levels per unit opening percentage corresponding to the dust removal point.

[0052] The total dust removal level determination unit 202 is used to sum up the number of dust removal levels corresponding to all dust removal points to obtain the total number of dust removal levels corresponding to the fan.

[0053] The target speed determination unit 203 is used to determine the target speed of the fan based on the total number of dust removal levels corresponding to the fan.

[0054] The dust removal grade serves as the smallest unit of measurement for allocating fan speed. The number of dust removal grades per unit opening percentage represents the number of dust removal grades corresponding to each 1% opening of the dust removal valve. The number of dust removal grades per unit opening percentage for each dust removal point is predetermined based on the pipe diameter of the dust removal valve corresponding to that point. The fan is connected to at least one dust removal pipe, and each dust removal pipe is connected to at least one dust removal point. A dust removal valve corresponding to each dust removal point is installed at each dust removal point, and a pressure sensor corresponding to the dust removal point is installed on the side of each dust removal valve connected to the fan. The preset negative pressure value corresponding to the dust removal point is the air pressure value corresponding to the air volume required for the dust removal point to operate normally.

[0055] Furthermore, the device also includes: a preset negative pressure value determination unit, used to, for each dust removal point, use the pressure sensor corresponding to the dust removal point to monitor the wind pressure value required for the smoke and dust passing through the dust removal point to stay at the dust removal point for two seconds when the dust removal point is in operation, and use the obtained wind pressure value as the preset negative pressure value corresponding to the dust removal point.

[0056] Furthermore, the target opening adjustment unit 200 specifically includes:

[0057] The wind pressure value acquisition module is used to acquire the wind pressure value of each dust removal point from the pressure sensor corresponding to that dust removal point.

[0058] The opening adjustment module is used to periodically increase the opening of the dust removal valve corresponding to the dust removal point at preset time intervals by preset opening step values ​​if the wind pressure value at the dust removal point is not within a specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value at the dust removal point is greater than the preset negative pressure value corresponding to the dust removal point. The module monitors the wind pressure value at the dust removal point using a pressure sensor corresponding to the dust removal point until the wind pressure value at the dust removal point is within a specified deviation range of the preset negative pressure value corresponding to the dust removal point. Then, the adjustment of the dust removal valve is stopped, and the opening percentage of the dust removal valve at this point is taken as the target opening value for the dust removal point. Percentage of opening degree; if the wind pressure value of the dust removal point is not within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value of the dust removal point is less than the preset negative pressure value corresponding to the dust removal point, then the opening degree of the dust removal valve corresponding to the dust removal point is reduced periodically at a preset time interval according to a preset opening degree step value, and the wind pressure value of the dust removal point is monitored by the pressure sensor corresponding to the dust removal point until the wind pressure value of the dust removal point is within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, then the adjustment of the dust removal valve corresponding to the dust removal point is stopped, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage of the dust removal point.

[0059] Furthermore, the dust removal point dust removal level determination unit 201 is specifically used for:

[0060] For each dust removal point, the target opening percentage corresponding to the dust removal point is multiplied by the number of dust removal levels per unit opening percentage corresponding to the dust removal point to obtain the number of dust removal levels corresponding to the dust removal point.

[0061] Furthermore, the target rotational speed determining unit 203 is specifically used for:

[0062] Based on the total number of dust removal levels corresponding to the fan and the pre-set matching relationship between the number of dust removal levels and the fan speed, the fan speed corresponding to the total number of dust removal levels is determined as the target speed of the fan.

[0063] The embodiments of the present invention are device-type embodiments that correspond one-to-one with the foregoing method embodiments. The embodiments of the present invention can be understood based on the foregoing method embodiments, and will not be repeated here.

[0064] The embodiments of this invention have the following technical effects: By finely dividing the fan speed into dust removal levels, and determining the opening degree of the dust removal valve at each dust removal point according to the required negative pressure value, the dust removal level of each dust removal point is determined, thus obtaining the total dust removal level. Based on the fan speed determined from the dust removal level, the opening degree of the dust removal valve and the speed of the dust removal fan are precisely controlled. Compared with the control methods of existing technologies, this reduces dust removal power consumption by more than 20%. The opening degree of the dust removal valve at each dust removal point is accurately set according to the negative pressure value corresponding to the air volume requirement, ensuring that the actual air volume at that dust removal point matches the air volume requirement. This avoids problems frequently encountered in existing technologies, such as electric dust removal valve failure, dust removal pipeline blockage due to air volume mismatch, and filter bag blockage caused by excessively high dust collector pressure differential. Therefore, the technical solution of this invention only requires periodic maintenance of the pressure sensor and dust removal valve actuator, greatly reducing the maintenance workload of the dust removal system. By improving the dust removal level, the rationality and accuracy of the air volume distribution at each dust removal point are improved, allowing the limited air volume to be rationally allocated to each dust removal point, thereby improving the dust removal effect.

[0065] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0066] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the invention.

[0067] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0068] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations falling within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is used in a manner similar to the term "including." Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0069] Those skilled in the art will also understand that the various illustrative logical blocks, units, and steps listed in the embodiments of the present invention can be implemented by electronic hardware, computer software, or a combination of both. To clearly demonstrate the interchangeability of hardware and software, the functions of the various illustrative components, units, and steps described above have been generally described. Whether such functionality is implemented through hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functions using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present invention.

[0070] The various illustrative logic blocks or units described in the embodiments of this invention can be implemented or operate the described functions using a general-purpose processor, digital signal processor, application-specific integrated circuit (ASIC), field-programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor; alternatively, it can be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented using a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0071] The steps of the methods or algorithms described in the embodiments of this invention can be directly embedded in hardware, a software module executed by a processor, or a combination of both. The software module can be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from and write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium can be housed in an ASIC, which can be housed in a user terminal. Optionally, the processor and storage medium can also be housed in different components of the user terminal.

[0072] In one or more exemplary designs, the functions described in the embodiments of the present invention can be implemented in hardware, software, firmware, or any combination of these three. If implemented in software, these functions can be stored on a computer-readable medium or transmitted on a computer-readable medium in the form of one or more instructions or code. Computer-readable media include computer storage media and communication media that facilitate the transfer of computer programs from one place to another. Storage media can be any available media that can be accessed by a general-purpose or special-purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store program code in the form of instructions or data structures and other forms that can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection can be suitably defined as a computer-readable medium, for example, if the software is transmitted from a website, server or other remote resource via a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wirelessly, such as infrared, wireless and microwave, it is also included in the defined computer-readable medium. The disks and discs mentioned include compressed disks, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs. Disks typically copy data magnetically, while disks typically copy data optically using lasers. Combinations of the above can also be contained in computer-readable media.

[0073] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for energy saving in large fans by distributing air volume based on wind pressure and dust removal level, characterized in that, include: For each dust removal point driven by the fan, adjust the dust removal valve corresponding to the dust removal point so that the wind pressure at the dust removal point is the preset negative pressure value corresponding to the dust removal point, and take the opening percentage of the dust removal valve corresponding to the dust removal point at this time as the target opening percentage corresponding to the dust removal point. For each dust removal point, the number of dust removal levels corresponding to the dust removal point is determined based on the target opening percentage corresponding to the dust removal point and the number of dust removal levels per unit opening percentage corresponding to the dust removal point. Sum the number of dust removal levels corresponding to all dust removal points to obtain the total number of dust removal levels corresponding to the fan. The target rotational speed of the fan is determined based on the total number of dust removal grades corresponding to the fan. The dust removal grade serves as the smallest unit of measurement for allocating fan speed. The number of dust removal grades per unit opening percentage represents the number of dust removal grades corresponding to each 1% opening of the dust removal valve. The number of dust removal grades per unit opening percentage for each dust removal point is predetermined based on the pipe diameter of the dust removal valve corresponding to that point. The fan is connected to at least one dust removal pipe, and each dust removal pipe is connected to at least one dust removal point. A dust removal valve corresponding to each dust removal point is installed at each dust removal point, and a pressure sensor corresponding to the dust removal point is installed on the side of each dust removal valve connected to the fan. The preset negative pressure value corresponding to the dust removal point is the air pressure value corresponding to the air volume required for the dust removal point to operate normally.

2. The energy-saving method for large fans that distributes air volume based on wind pressure and dust removal level as described in claim 1, characterized in that, For each dust removal point, in the working state of the dust removal point, the pressure sensor corresponding to the dust removal point is used to monitor the wind pressure value required for the smoke and dust passing through the dust removal point to stay at the dust removal point for two seconds, and the obtained wind pressure value is used as the preset negative pressure value corresponding to the dust removal point.

3. The energy-saving method for large fans that allocates air volume based on wind pressure and dust removal level as described in claim 1, characterized in that, For each dust removal point driven by the fan, the dust removal valve corresponding to the dust removal point is adjusted so that the wind pressure at the dust removal point is a preset negative pressure value corresponding to the dust removal point. The opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage corresponding to the dust removal point, including: For each dust removal point, the pressure sensor corresponding to the dust removal point is used to collect the wind pressure value of the dust removal point; If the wind pressure value at the dust removal point is not within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value at the dust removal point is greater than the preset negative pressure value corresponding to the dust removal point, then the opening of the dust removal valve corresponding to the dust removal point is increased periodically at a preset time interval by a preset opening step value, and the wind pressure value at the dust removal point is monitored by the pressure sensor corresponding to the dust removal point until the wind pressure value at the dust removal point is within the specified deviation range of the preset negative pressure value corresponding to the dust removal point. Then the adjustment of the dust removal valve corresponding to the dust removal point is stopped, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage of the dust removal point. If the wind pressure value at the dust removal point is not within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value at the dust removal point is less than the preset negative pressure value corresponding to the dust removal point, then the opening of the dust removal valve corresponding to the dust removal point is reduced periodically at a preset time interval according to a preset opening step value, and the wind pressure value at the dust removal point is monitored by the pressure sensor corresponding to the dust removal point until the wind pressure value at the dust removal point is within the specified deviation range of the preset negative pressure value corresponding to the dust removal point. Then, the adjustment of the dust removal valve corresponding to the dust removal point is stopped, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage of the dust removal point.

4. The energy-saving method for large fans that allocates air volume based on wind pressure and dust removal level as described in claim 1, characterized in that, For each dust removal point, the number of dust removal levels corresponding to the dust removal point is determined based on the target opening percentage and the number of dust removal levels per unit opening percentage, including: For each dust removal point, the target opening percentage corresponding to the dust removal point is multiplied by the number of dust removal levels per unit opening percentage corresponding to the dust removal point to obtain the number of dust removal levels corresponding to the dust removal point.

5. The energy-saving method for large fans that allocates air volume based on wind pressure and dust removal level as described in claim 1, characterized in that, Determining the target rotational speed of the fan based on the total number of dust removal grades corresponding to the fan includes: Based on the total number of dust removal levels corresponding to the fan and the pre-set matching relationship between the number of dust removal levels and the fan speed, the fan speed corresponding to the total number of dust removal levels is determined as the target speed of the fan.

6. A large-scale fan energy-saving device that distributes air volume based on wind pressure and dust removal level, characterized in that, include: The target opening adjustment unit is used to adjust the dust removal valve corresponding to each dust removal point driven by the fan, so that the wind pressure at the dust removal point is the preset negative pressure value corresponding to the dust removal point, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage corresponding to the dust removal point. The dust removal point dust removal level quantity determination unit is used to determine the number of dust removal levels corresponding to each dust removal point based on the target opening percentage corresponding to the dust removal point and the number of dust removal levels per unit opening percentage corresponding to the dust removal point. The total dust removal level determination unit is used to sum the number of dust removal levels corresponding to all dust removal points to obtain the total number of dust removal levels corresponding to the fan. The target speed determination unit is used to determine the target speed of the fan based on the total number of dust removal grades corresponding to the fan. The dust removal grade serves as the smallest unit of measurement for allocating fan speed. The number of dust removal grades per unit opening percentage represents the number of dust removal grades corresponding to each 1% opening of the dust removal valve. The number of dust removal grades per unit opening percentage for each dust removal point is predetermined based on the pipe diameter of the dust removal valve corresponding to that point. The fan is connected to at least one dust removal pipe, and each dust removal pipe is connected to at least one dust removal point. A dust removal valve corresponding to each dust removal point is installed at each dust removal point, and a pressure sensor corresponding to the dust removal point is installed on the side of each dust removal valve connected to the fan. The preset negative pressure value corresponding to the dust removal point is the air pressure value corresponding to the air volume required for the dust removal point to operate normally.

7. The energy-saving device for large-scale fans that distributes air volume based on wind pressure and dust removal level as described in claim 6, characterized in that, The device further includes: The preset negative pressure value determination unit is used to, for each dust removal point, use the pressure sensor corresponding to the dust removal point to monitor the wind pressure value required for the smoke and dust passing through the dust removal point to stay at the dust removal point for two seconds when the dust removal point is in operation, and use the obtained wind pressure value as the preset negative pressure value corresponding to the dust removal point.

8. The energy-saving device for large-scale fans that distributes air volume based on wind pressure and dust removal level as described in claim 6, characterized in that, The target opening adjustment unit specifically includes: The wind pressure value acquisition module is used to acquire the wind pressure value of each dust removal point from the pressure sensor corresponding to that dust removal point. The opening adjustment module is used to periodically increase the opening of the dust removal valve corresponding to the dust removal point at preset time intervals by preset opening step values ​​if the wind pressure value at the dust removal point is not within a specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value at the dust removal point is greater than the preset negative pressure value corresponding to the dust removal point. The module monitors the wind pressure value at the dust removal point using a pressure sensor corresponding to the dust removal point until the wind pressure value at the dust removal point is within a specified deviation range of the preset negative pressure value corresponding to the dust removal point. Then, the adjustment of the dust removal valve is stopped, and the opening percentage of the dust removal valve at this point is taken as the target opening value for the dust removal point. Percentage of opening degree; if the wind pressure value of the dust removal point is not within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, and the wind pressure value of the dust removal point is less than the preset negative pressure value corresponding to the dust removal point, then the opening degree of the dust removal valve corresponding to the dust removal point is reduced periodically at a preset time interval according to a preset opening degree step value, and the wind pressure value of the dust removal point is monitored by the pressure sensor corresponding to the dust removal point until the wind pressure value of the dust removal point is within the specified deviation range of the preset negative pressure value corresponding to the dust removal point, then the adjustment of the dust removal valve corresponding to the dust removal point is stopped, and the opening percentage of the dust removal valve corresponding to the dust removal point at this time is taken as the target opening percentage of the dust removal point.

9. The energy-saving device for large-scale fans that distributes air volume based on wind pressure and dust removal level as described in claim 6, characterized in that, The unit for determining the number of dust removal points and their dust removal levels is specifically used for: For each dust removal point, the target opening percentage corresponding to the dust removal point is multiplied by the number of dust removal levels per unit opening percentage corresponding to the dust removal point to obtain the number of dust removal levels corresponding to the dust removal point.

10. The energy-saving device for large-scale fans that distributes air volume based on wind pressure and dust removal level as described in claim 6, characterized in that, The target rotational speed determination unit is specifically used for: Based on the total number of dust removal levels corresponding to the fan and the pre-set matching relationship between the number of dust removal levels and the fan speed, the fan speed corresponding to the total number of dust removal levels is determined as the target speed of the fan.

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