Method for controlling bag differential pressure of electrostatic fabric filter

Abstract

The invention provides a method for controlling differential pressure of a cloth bag of an electrostatic fabric filter, and relates to the technical field of dust removers, the method comprises the following steps: subtracting outlet pressure from inlet pressure of the cloth bag to obtain the differential pressure of the cloth bag; when the pressure difference of the cloth bag belongs to the first pressure interval or the second pressure interval, the first pressure difference change rate of the cloth bag is calculated; subtracting the first pressure difference change rate from a first preset threshold value to obtain a first blowing time interval of the cloth bag, and blowing the cloth bag according to preset blowing intensity at the first blowing time interval; when the pressure difference of the cloth bag is smaller than the minimum value of the first pressure interval or larger than the maximum value of the second pressure interval, the second pressure difference change rate of the cloth bag is calculated; the second pressure difference change rate is subtracted from the first preset threshold value and then multiplied by the preset coefficient, the second injection time interval of the cloth bag is obtained, the cloth bag is injected according to the preset injection intensity at the second injection time interval, the injection time interval is dynamically adjusted, and the differential pressure of the cloth bag is accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of dust collectors, and in particular to a method for controlling the differential pressure of filter bags in an electrostatic bag composite dust collector. Background Art

[0002] The electrostatic bag composite dust collector is a highly efficient dust removal device widely used in industrial waste gas treatment. During the operation of the electrostatic bag composite dust collector, the control of the differential pressure of the filter bags is crucial for maintaining the efficient operation of the dust collector.

[0003] In traditional technologies, the differential pressure limit of the filter bags is usually set within the range of 600 - 800 Pa. However, when the unit heat load changes or the current differential pressure value exceeds this limit range, it is necessary to frequently manually adjust the spraying interval. This manual adjustment method not only increases the monitoring and operation burden of the operators, but also may cause instability in the inlet pressure of the induced draft fan, thereby affecting the safe operation and energy-saving effect of the unit. Traditional technologies cannot perform autonomous optimization adjustments according to the real-time changes in the differential pressure of the filter bags. The mode relying on manual operation is not only prone to misoperations, but also difficult to achieve precise control, thus unable to effectively reduce the system resistance and waste of compressed air caused by excessive spraying. Summary of the Invention

[0004] The present invention provides a method for controlling the differential pressure of filter bags in an electrostatic bag composite dust collector to solve the technical problem in the prior art that the differential pressure of the filter bags in the electrostatic bag composite dust collector cannot be automatically and accurately controlled.

[0005] On the one hand, the present invention provides a method for controlling the differential pressure of filter bags in an electrostatic bag composite dust collector, including: Detecting the inlet pressure and outlet pressure of the filter bag; Subtracting the outlet pressure from the inlet pressure to obtain the differential pressure of the filter bag; When the differential pressure of the filter bag belongs to the first pressure range or the second pressure range, calculating the first differential pressure change rate of the filter bag; wherein, the maximum value of the first pressure range is less than the minimum value of the second pressure range; Subtracting the first differential pressure change rate from the first preset threshold to obtain the first spraying time interval of the filter bag, and spraying the filter bag according to the preset spraying intensity using the first spraying time interval; When the differential pressure of the filter bag is less than the minimum value of the first pressure range or greater than the maximum value of the second pressure range, calculating the second differential pressure change rate of the filter bag; Subtracting the second differential pressure change rate from the first preset threshold and then multiplying by a preset coefficient to obtain the second spraying time interval of the filter bag, and spraying the filter bag according to the preset spraying intensity using the second spraying time interval.

[0006] According to the method for controlling the differential pressure of filter bags in an electrostatic bag composite dust collector provided by the present invention, it further includes: Obtain the service life of the cloth bag and the dust particle size on the surface of the cloth bag; Determine a first adjustment coefficient according to the service life; wherein, the first adjustment coefficient decreases as the service life increases; Determine a second adjustment coefficient according to the dust particle size; wherein, the second adjustment coefficient increases as the dust particle size increases; Multiply the first adjustment coefficient and the second adjustment coefficient to obtain a comprehensive adjustment coefficient; Adjust the preset injection intensity based on the comprehensive adjustment coefficient.

[0007] According to a control method for the differential pressure of the cloth bag of an electric-bag composite dust collector provided by the present invention, determining the first adjustment coefficient according to the service life includes: Multiply a preset attenuation coefficient by the service life of the cloth bag to obtain a first product; Subtract the first product from a preset value to obtain the first adjustment coefficient; Determining the second adjustment coefficient according to the dust particle size includes: Multiply a preset growth coefficient by the dust particle size to obtain a second product; Subtract the second product from a preset value to obtain the second adjustment coefficient; When the comprehensive adjustment coefficient is less than the minimum value of the first coefficient preset range, multiply the minimum value of the first coefficient preset range by the preset injection intensity; When the comprehensive adjustment coefficient belongs to the first coefficient preset range, multiply the maximum value of the first coefficient preset range by the preset injection intensity; When the comprehensive adjustment coefficient is greater than the maximum value of the first coefficient preset range, continue to use the preset injection intensity.

[0008] According to a control method for the differential pressure of the cloth bag of an electric-bag composite dust collector provided by the present invention, an ozone decomposition device is arranged at the inlet of the cloth bag, and the method further includes: Detect the ozone concentration in a preset area of the cloth bag; When the ozone concentration exceeds a preset concentration threshold, start the ozone decomposition device; Reduce the corona voltage of the electric-bag composite dust collector.

[0009] According to a control method for the differential pressure of the cloth bag of an electric-bag composite dust collector provided by the present invention, it further includes: Detect the flue gas flow rate in a preset area of the cloth bag; When the flue gas flow rate is higher than a preset flow rate threshold, reduce the first preset threshold of the cloth bag, including: Calculate the difference between the detected flue gas flow velocity and the preset flow velocity threshold, calculate the ratio of the difference to the preset flow velocity threshold, multiply the ratio by the flow velocity adjustment coefficient to obtain a multiplication result, and reduce the first preset threshold of the filter bag based on the multiplication result.

[0010] According to a control method for the differential pressure of the filter bag of an electric-bag composite dust collector provided by the present invention, it further includes: Detect the humidity in the preset area of the filter bag; When the humidity is lower than the preset humidity threshold, increase the humidity of the injection gas.

[0011] According to a control method for the differential pressure of the filter bag of an electric-bag composite dust collector provided by the present invention, it further includes: Detect the dust concentration in the preset area of the filter bag; When the dust concentration is higher than the preset concentration threshold, start the mechanical rapping device or the acoustic cleaning device to clean the filter bag.

[0012] According to a control method for the differential pressure of the filter bag of an electric-bag composite dust collector provided by the present invention, it further includes: Perform pre-charging treatment on the dust in the electric field area of the electric-bag composite dust collector to make the dust particles carry the same kind of charge; Introduce the pre-charged dust into the bag dust removal area, and utilize the electrostatic repulsion force between the dust particles to form a dust layer when the dust is deposited on the surface of the filter bag; Dynamically adjust the electric field strength according to the porosity of the dust layer on the surface of the filter bag to maintain the air permeability and peelability of the dust layer.

[0013] According to a control method for the differential pressure of the filter bag of an electric-bag composite dust collector provided by the present invention, the dynamically adjusting the electric field strength according to the porosity of the dust layer on the surface of the filter bag to maintain the air permeability and peelability of the dust layer includes: Judge whether the porosity of the dust layer is within the preset interval: If the porosity is lower than the lower limit value of the preset porosity interval, increase the electric field strength; If the porosity is higher than the upper limit value of the preset porosity interval, reduce the electric field strength.

[0014] According to a control method for the differential pressure of the filter bag of an electric-bag composite dust collector provided by the present invention, it further includes: Detect the temperature in the preset area of the filter bag; When the temperature is lower than the lowest value of the preset temperature interval, heat the filter bag area to prevent condensation on the surface of the filter bag and dust adhesion; When the temperature is higher than the highest value of the preset temperature interval, cool the filter bag area to prevent dust combustion.

[0015] The control method for the differential pressure of the filter bags in an electrostatic - bag combined dust collector provided by the present invention detects the differential pressure of the filter bags, calculates the differential pressure change rate according to the interval where it is located, and then dynamically adjusts the pulse - jet interval time, achieving precise control of the differential pressure of the filter bags. Compared with the traditional manual adjustment method, this method can automatically adapt to the change of the differential pressure of the filter bags, reduce the operation burden of the operating personnel, and improve the operation stability and energy - saving effect of the electrostatic - bag combined dust collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic flow chart of the control method for the differential pressure of the filter bags in an electrostatic - bag combined dust collector provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of the control device for the differential pressure of the filter bags in an electrostatic - bag combined dust collector provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention fall within the protection scope of the present invention.

[0019] Figure 1 is a schematic flow chart of the control method for the differential pressure of the filter bags in an electrostatic - bag combined dust collector provided by an embodiment of the present invention. The execution subject of this control method can be devices such as computers and tablet computers.

[0020] See Figure 1 , the control method for the differential pressure of the filter bags in an electrostatic - bag combined dust collector may include the following steps.

[0021] Step 101: Detect the inlet pressure and outlet pressure of the filter bag.

[0022] In this step, pressure sensors can be respectively arranged on the inlet pipeline and the outlet pipeline of the filter bag, so as to collect the inlet pressure and outlet pressure of the filter bag in real time.

[0023] Step 102: Subtract the outlet pressure from the inlet pressure to obtain the differential pressure of the fabric filter bag.

[0024] Step 103: When the differential pressure of the fabric filter bag belongs to the first pressure range or the second pressure range, calculate the first differential pressure change rate of the fabric filter bag; wherein, the maximum value of the first pressure range is less than the minimum value of the second pressure range.

[0025] In this step, the first differential pressure change rate is the differential pressure of the fabric filter bag within a preset time period. The preset time period can be set, for example, to 2 minutes, 1 minute, 30 seconds, etc. The first pressure range can be set, for example, to 600 - 650 Pa, and the second pressure range can also be set, for example, to 750 - 800 Pa. It can be understood that when the differential pressure of the fabric filter bag is greater than 650 and less than 750, the current state is maintained without any processing.

[0026] Step 104: Subtract the first differential pressure change rate from the first preset threshold to obtain the first jetting time interval of the fabric filter bag, and jet the fabric filter bag according to the preset jetting intensity using the first jetting time interval.

[0027] In this step, the first preset threshold can generally be set to 500 seconds. It can be understood that subtracting the first differential pressure change rate from the first preset threshold means directly subtracting their numerical values, ignoring the units. The preset jetting intensity can also be set according to the actual situation, and no specific limitation is made here.

[0028] Step 105: When the differential pressure of the fabric filter bag is less than the minimum value of the first pressure range or greater than the maximum value of the second pressure range, calculate the second differential pressure change rate of the fabric filter bag.

[0029] In this step, the calculation of the second differential pressure change rate can refer to the calculation method of the above first differential pressure change rate, which will not be elaborated here.

[0030] Step 106: After subtracting the second differential pressure change rate from the first preset threshold and multiplying by a preset coefficient, obtain the second jetting time interval of the fabric filter bag, and jet the fabric filter bag according to the preset jetting intensity using the second jetting time interval.

[0031] In this step, subtracting the second differential pressure change rate from the first preset threshold means directly subtracting their numerical values, ignoring the units. The preset coefficient can be set to 2, or other values, such as any value between 1.5 - 3.

[0032] In this embodiment, by detecting the differential pressure of the fabric filter bag and calculating the differential pressure change rate according to the interval it is in, and then dynamically adjusting the jetting time interval, precise control of the differential pressure of the fabric filter bag is achieved. Compared with the traditional manual adjustment method, this method can automatically adapt to the change of the differential pressure of the fabric filter bag, reduce the operation burden of the operating personnel, and improve the operation stability and energy-saving effect of the electric - bag composite dust collector.

[0033] In one embodiment of this specification, the method for controlling the differential pressure of the filter bags in an electric - bag composite dust collector further includes: Step 1: Obtain the service life of the filter bag and the dust particle size on the surface of the filter bag.

[0034] In this step, an input interface of "filter bag installation date" can be set in the control system of the dust collector. The maintenance personnel input the specific date when installing the filter bag, and the system automatically calculates the service life according to the current date. The unit of the service life can be years. Sensors (such as capacitive, piezoelectric sensors) can also be installed on the surface of the filter bag to estimate the dust particle size by monitoring the capacitance or pressure changes caused by dust deposition. The unit of the dust particle size can be microns.

[0035] Step 2: Determine the first adjustment coefficient according to the service life; wherein, the first adjustment coefficient decreases as the service life increases.

[0036] Step 3: Determine the second adjustment coefficient according to the dust particle size; wherein, the second adjustment coefficient increases as the dust particle size increases. Among them, the value ranges of both the first adjustment coefficient and the second adjustment coefficient can be (0, 1].

[0037] Step 4: Multiply the first adjustment coefficient and the second adjustment coefficient to obtain a comprehensive adjustment coefficient.

[0038] Step 5: Adjust the preset injection intensity based on the comprehensive adjustment coefficient.

[0039] In this embodiment, the service life of the filter bag and the dust particle size are introduced as adjustment factors, and the comprehensive adjustment coefficient is calculated to dynamically adjust the injection intensity, which enables the injection intensity to be optimized according to the actual usage conditions of the filter bag and the dust characteristics, further improving the dust removal efficiency, extending the service life of the filter bag, and reducing the waste of compressed air caused by excessive injection.

[0040] In one embodiment of this specification, determining the first adjustment coefficient according to the service life includes: Multiply the preset attenuation coefficient by the service life of the filter bag to obtain a first product; Subtract the first product from the preset value to obtain the first adjustment coefficient; The calculation formula of the first adjustment coefficient is as shown in formula (1) below: C1 = 1 - k1×T (1); Wherein, C1 is the first adjustment coefficient, T is the service life of the filter bag (unit: year), k1 is the attenuation coefficient, and its value range is (0, 0.1], and 1 is the preset value; Determining the second adjustment coefficient according to the dust particle size includes: Multiply the preset growth coefficient by the dust particle size to obtain a second product; Subtract the second product from the preset value to obtain a second adjustment coefficient; The calculation formula for the second adjustment coefficient is shown in the following formula (2): C2 = 1 - k2×D (2); where C2 is the second adjustment coefficient, D is the dust particle size (unit: micrometer), k2 is the growth coefficient, and the value range is (0, 0.01]; When the comprehensive adjustment coefficient is less than the minimum value of the first coefficient preset range, multiply the minimum value of the first coefficient preset range by the preset injection intensity; When the comprehensive adjustment coefficient belongs to the first coefficient preset range, multiply the maximum value of the first coefficient preset range by the preset injection intensity; When the comprehensive adjustment coefficient is greater than the maximum value of the first coefficient preset range, continue to use the preset injection intensity.

[0041] In this embodiment, it can be understood that the preset value is greater than the first product and the second product. The specific calculation methods of the first adjustment coefficient and the second adjustment coefficient are clarified, providing a quantitative basis for the determination of the comprehensive adjustment coefficient, enabling more precise adjustment of the injection intensity according to the service life of the cloth bag and the dust particle size, and enhancing the scientificity and operability of the control method.

[0042] In an embodiment of this specification, an ozone decomposition device is provided at the inlet of the cloth bag, and the method further includes: Detect the ozone concentration in the preset area of the cloth bag; When the ozone concentration exceeds the preset concentration threshold, start the ozone decomposition device; Reduce the corona voltage of the electrostatic - fabric composite dust collector.

[0043] In this embodiment, select a suitable ozone sensor (such as an electrochemical sensor or an ultraviolet absorption sensor), install the sensor in the preset area of the cloth bag to ensure that the sensor can detect the ozone concentration near the cloth bag, for example, usually installed near the inlet of the cloth bag or in the key area inside the dust collector. Integrating the ozone sensor into the control system of the dust collector can realize real - time detection of the ozone concentration in the preset area of the cloth bag. Setting an ozone decomposition device at the inlet of the cloth bag and starting the device and adjusting the corona voltage according to the ozone concentration can effectively avoid potential damage of ozone to the cloth bag and other components of the dust collector. At the same time, reducing the corona voltage helps to reduce energy consumption and further optimize the operating performance of the dust collector.

[0044] In an embodiment of this specification, the method for controlling the differential pressure of the cloth bag of the electrostatic - fabric composite dust collector further includes: Detect the flue gas flow velocity in the preset area of the cloth bag; When the flue gas flow rate is higher than the preset flow rate threshold, reducing the first preset threshold of the cloth bag includes: Calculating the difference between the detected flue gas flow rate and the preset flow rate threshold, calculating the ratio of the difference to the preset flow rate threshold, multiplying the ratio by the flow rate adjustment coefficient to obtain a multiplication result, and reducing the first preset threshold of the cloth bag based on the multiplication result; Reducing the first preset threshold of the cloth bag is shown in the following formula (3): (3); where is the adjusted first preset threshold, is the first preset threshold, V is the detected flue gas flow rate, is the preset flow rate threshold; is the flow rate adjustment coefficient.

[0045] In this embodiment, the first preset threshold is adjusted according to the flue gas flow rate so that the injection interval can adapt to different flue gas flow rate conditions. When the flue gas flow rate is too high, shortening the injection interval can clean the cloth bag more timely, prevent excessive pressure difference caused by dust accumulation, and thus improve the adaptability of the dust collector to different working conditions. The flue gas flow rate refers to the speed of the flue gas passing through the bag filter, usually in meters per second (m / s). In a typical industrial boiler or power plant dust collector, the flue gas flow rate may be between 1 - 5 m / s. The preset flow rate threshold is a reference value set by the system to determine whether the current flue gas flow rate is too high. The preset flow rate threshold may be set to 3 m / s or 4 m / s. The flow rate adjustment coefficient is a coefficient used to adjust the injection interval, and its magnitude depends on the influence degree of the flue gas flow rate on the operation of the dust collector. Usually, the value range is between 0.5 - 2. The multiplication result should be less than the preset value, that is, less than 1.

[0046] In an embodiment of this specification, the method for controlling the differential pressure of the cloth bag of the electrostatic - bag composite dust collector further includes: Detecting the humidity in the preset area of the cloth bag; When the humidity is lower than the preset humidity threshold, increasing the humidity of the injection gas.

[0047] In this embodiment, detecting the humidity and adjusting the humidity of the injection gas according to the humidity situation can effectively prevent dew condensation on the surface of the cloth bag and dust adhesion. This helps to maintain good air permeability of the cloth bag, reduce the decrease in dust removal efficiency caused by humidity problems, and further ensure the stable operation of the dust collector.

[0048] In an embodiment of this specification, the method for controlling the differential pressure of the cloth bag of the electrostatic - bag composite dust collector further includes: Detecting the dust concentration in the preset area of the cloth bag; When the dust concentration is higher than the preset concentration threshold, starting the mechanical vibration device or the acoustic cleaning device to clean the cloth bag.

[0049] In this embodiment, when the dust concentration is too high, the mechanical vibration device or the acoustic soot cleaning device is started to clean the filter bag, providing an additional means for cleaning the filter bag. This combined cleaning method can more effectively remove the dust on the surface of the filter bag, further reduce the differential pressure of the filter bag, and improve the operation efficiency of the dust collector. A dust concentration sensor suitable for on-line monitoring can be selected, such as a laser dust detector or a capacitive dust sensor. The sensor is installed at a key position in the filter bag dust removal area (such as near the inlet or outlet of the filter bag) to ensure that the dust concentration in the preset area of the filter bag can be accurately detected.

[0050] In an embodiment of this specification, the method for controlling the differential pressure of the filter bag of the electrostatic bag composite dust collector further includes: Pre-charging the dust in the electric field area of the electrostatic bag composite dust collector so that the dust particles carry the same kind of charge; Introducing the pre-charged dust into the filter bag dust removal area, and using the electrostatic repulsion force between the dust particles to form a dust layer when the dust is deposited on the surface of the filter bag; Dynamically adjusting the electric field strength according to the porosity of the dust layer on the surface of the filter bag to maintain the air permeability and peelability of the dust layer.

[0051] In this embodiment, by pre-charging the dust in the electric field area and dynamically adjusting the electric field strength according to the porosity of the dust layer, a dust layer with a high porosity can be formed on the surface of the filter bag. This is not only beneficial to the peeling of the dust, but also can maintain the air permeability of the surface of the filter bag, further improving the dust removal efficiency and reducing the risk of filter bag blockage. The porosity refers to the ratio of the pore volume to the total volume in the material, usually expressed as a percentage (%). In the context of the dust layer, a high porosity means that there are more voids between the dust particles, and these voids help the gas to pass through, thereby improving the air permeability of the filter bag and the peelability of the dust.

[0052] In an embodiment of this specification, dynamically adjusting the electric field strength according to the porosity of the dust layer on the surface of the filter bag to maintain the air permeability and peelability of the dust layer includes: Judging whether the porosity of the dust layer is within a preset interval: If the porosity is lower than the lower limit value of the preset porosity interval, increase the electric field strength; If the porosity is higher than the upper limit value of the preset porosity interval, reduce the electric field strength.

[0053] In this embodiment, a specific method for adjusting the electric field strength according to the porosity of the dust layer is defined, that is, increasing the electric field strength when the porosity is lower than the lower limit value and decreasing the electric field strength when it is higher than the upper limit value. This dynamic adjustment method can better maintain the air permeability and peelability of the dust layer, further optimize the performance of the dust collector, and increase the service life of the filter bag. The porosity of an ordinary dust layer may be between 30% and 40%, while a dust layer with a high porosity formed by optimized treatment (such as pre-charging) may reach 50% - 70%. Therefore, the preset porosity range can be selected as 50% - 70%, or 50% - 60%.

[0054] In an embodiment of this specification, the method for controlling the differential pressure of the filter bag of the electrostatic - bag composite dust collector further includes: Detect the temperature in the preset area of the filter bag; When the temperature is lower than the lowest value of the preset temperature range, heat the filter bag area to prevent condensation on the surface of the filter bag and dust adhesion; When the temperature is higher than the highest value of the preset temperature range, cool the filter bag area to prevent dust combustion.

[0055] In this embodiment, by detecting the temperature and heating or cooling the filter bag area according to the temperature situation, it can effectively prevent condensation on the surface of the filter bag and dust combustion. This helps to maintain the good working state of the filter bag, reduce the risk of dust removal efficiency decline and equipment damage caused by temperature problems, and further ensure the safe and stable operation of the dust collector. Install electric heaters in the inlet pipeline of the filter bag area or inside the filter bag to ensure uniform heat distribution. Integrate the electric heaters with temperature sensors and the PLC control system, and automatically start the heaters when the temperature is lower than the lowest value of the preset temperature range; automatically stop heating when the temperature reaches the preset value. Install spray devices in the inlet pipeline or on the surface of the filter bag area to ensure that the spray can evenly cover the filter bag area, integrate the spray devices with temperature sensors and the PLC control system, and automatically start the spray devices when the temperature is higher than the highest value of the preset temperature range; automatically stop spraying when the temperature drops to the preset value.

[0056] In some other embodiments of this specification, the method for controlling the differential pressure of the filter bag of the electrostatic - bag composite dust collector further includes: Install dust property sensors at the inlet or pre - charging area of the electrostatic - bag composite dust collector to detect the physical properties of the dust in real - time, such as particle size distribution, specific resistance, humidity, etc.; According to the physical properties of the dust, such as particle size distribution, specific resistance, humidity, etc., dynamically adjust the electric field strength and pre - charging parameters, specifically as follows: When the particle size of the dust is less than the minimum value of the preset size range, increase the electric field strength to improve the charging efficiency of small - particle dust; when the particle size is greater than the maximum value of the preset size range, appropriately reduce the electric field strength to reduce energy consumption; When the dust resistivity is higher than the maximum value of the preset resistivity range, increase the electric field strength to improve the charging efficiency; when the dust resistivity is lower than the minimum value of the preset resistivity range, reduce the electric field strength to prevent excessive dust accumulation; When the dust humidity is higher than the maximum value of the preset humidity range, appropriately reduce the electric field strength to prevent dust adhesion; when the humidity is lower than the minimum value of the preset humidity range, increase the electric field strength to improve the dust removal efficiency.

[0057] In some other embodiments of this specification, the method for controlling the differential pressure of the filter bags in an electrostatic - bag composite dust collector further includes: Set multiple resistivity monitoring points in the electric field area of the electrostatic - bag composite dust collector to monitor the change of the dust resistivity in different areas in real time; According to the distribution of the resistivity, divide the electric field area into multiple sub - areas, and each sub - area is monitored and controlled independently; According to the resistivity data of each area, dynamically adjust the electric field strength and pre - charging parameters, specifically as follows: When the resistivity of a certain area is higher than the maximum value of the preset resistivity range, increase the electric field strength and pre - charging strength of this area to improve the charging efficiency of the dust; When the resistivity of a certain area is lower than the minimum value of the preset resistivity range, appropriately reduce the electric field strength to prevent excessive energy consumption and secondary dust emission; Combined with the change of the resistivity, dynamically adjust the spraying parameters of the filter bags, specifically as follows: When the resistivity is higher than the maximum value of the preset resistivity range and the electric field strength increases, appropriately shorten the spraying time interval to prevent dust accumulation; When the resistivity is lower than the minimum value of the preset resistivity range and the electric field strength decreases, extend the spraying time interval and reduce the spraying frequency to reduce energy consumption.

[0058] In some other embodiments of this specification, the method for controlling the differential pressure of the filter bags in an electrostatic - bag composite dust collector further includes: Collect historical data of the filter bag differential pressure, spraying time interval, spraying intensity, environmental factors (temperature, humidity, flue gas flow rate, etc.) as training samples; Use machine learning algorithms (such as LSTM neural network, ARIMA model, etc.) to train the training samples to establish a differential pressure prediction model; According to the differential pressure result of the filter bag predicted by the differential pressure prediction model, adjust the spraying time interval or spraying intensity in advance to optimize the operation parameters of the dust collector.

[0059] Based on the same general inventive concept, the present invention also protects a control device for the differential pressure of the filter bags in an electrostatic - bag composite dust collector, as Figure 2 shown, Figure 2It is a schematic structural diagram of a control device for the differential pressure of filter bags in an electric - bag composite dust collector provided by an embodiment of the present invention. The control device for the differential pressure of filter bags in the electric - bag composite dust collector provided by the present invention will be described below. The control device for the differential pressure of filter bags in the electric - bag composite dust collector described below can be correspondingly referred to the control method for the differential pressure of filter bags in the electric - bag composite dust collector described above.

[0060] The control device for the differential pressure of filter bags in the electric - bag composite dust collector includes a pressure detection module 201, a differential pressure calculation module 202, a first differential pressure change rate calculation module 203, a first pulse - jet time control module 204, a second differential pressure change rate calculation module 205, and a second pulse - jet time control module 206.

[0061] The pressure detection module 201 detects the inlet pressure and outlet pressure of the filter bag. The differential pressure calculation module 202 subtracts the outlet pressure from the inlet pressure to obtain the differential pressure of the filter bag. When the differential pressure of the filter bag belongs to the first pressure range or the second pressure range, the first differential pressure change rate calculation module 203 calculates the first differential pressure change rate of the filter bag; wherein, the maximum value of the first pressure range is less than the minimum value of the second pressure range. The first pulse - jet time control module 204 subtracts the first differential pressure change rate from the first preset threshold to obtain the first pulse - jet time interval of the filter bag, and performs pulse - jetting on the filter bag according to the preset pulse - jet intensity using the first pulse - jet time interval. When the differential pressure of the filter bag is less than the minimum value of the first pressure range or greater than the maximum value of the second pressure range, the second differential pressure change rate calculation module 205 calculates the second differential pressure change rate of the filter bag. The second pulse - jet time control module 206 subtracts the second differential pressure change rate from the first preset threshold and then multiplies it by a preset coefficient to obtain the second pulse - jet time interval of the filter bag, and performs pulse - jetting on the filter bag according to the preset pulse - jet intensity using the second pulse - jet time interval.

[0062] Figure 3 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

[0063] As Figure 3 shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340. Among them, the processor 310, the communication interface 320, and the memory 330 complete communication with each other through the communication bus 340. The processor 310 can call the logical instructions in the memory 330 to execute the control method for the differential pressure of filter bags in the electric - bag composite dust collector.

[0064] In addition, when the logical instructions in the above-mentioned memory 330 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0065] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method for the differential pressure of the filter bags of the electric bag composite dust collector provided by the above-mentioned various methods.

[0066] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the control method for the differential pressure of the filter bags of the electric bag composite dust collector provided by the above-mentioned various methods.

[0067] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0068] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the technical solution, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disks, optical discs, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for controlling the bag differential pressure of an electric bag composite dust collector, characterized in that: include: Detect the inlet and outlet pressure of the bag; The bag pressure difference is obtained by subtracting the outlet pressure from the inlet pressure; When the bag pressure difference belongs to the first pressure interval or the second pressure interval, calculating the first pressure difference change rate of the bag; wherein the maximum value of the first pressure interval is less than the minimum value of the second pressure interval; A first blowing time interval of the bag is obtained by subtracting the first pressure difference change rate from the first preset threshold value, and the bag is blown according to a preset blowing intensity using the first blowing time interval; When the bag pressure difference is less than the minimum value of the first pressure interval or greater than the maximum value of the second pressure interval, calculating the second pressure difference change rate of the bag; The second pressure difference change rate is subtracted from the first preset threshold and multiplied by a preset coefficient to obtain a second blowing time interval of the cloth bag. The cloth bag is blown at a preset blowing intensity using the second blowing time interval.

2. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: Also includes: Obtaining the service life of the bag and the dust particle size on the surface of the bag; Determine a first adjustment coefficient according to the service life; wherein the first adjustment coefficient decreases as the service life increases; Determining a second adjustment coefficient according to the dust particle size; wherein the second adjustment coefficient increases as the dust particle size increases; Multiplying the first adjustment coefficient and the second adjustment coefficient to obtain a comprehensive adjustment coefficient; The preset blowing intensity is adjusted based on the comprehensive adjustment coefficient.

3. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 2, characterized in that: Determining a first adjustment coefficient according to the useful life includes: The preset attenuation coefficient is multiplied by the service life of the bag to obtain a first product; Subtracting the first product from a preset value to obtain a first adjustment coefficient; Determining a second adjustment coefficient according to the dust particle size includes: Multiply the dust particle size by the preset growth coefficient to obtain the second product; Subtracting the second product from a preset value to obtain a second adjustment coefficient; When the comprehensive adjustment coefficient is less than the minimum value of the first coefficient preset interval, multiplying the minimum value of the first coefficient preset interval by the preset blowing intensity; When the comprehensive adjustment coefficient belongs to the first coefficient preset interval, multiplying the maximum value of the first coefficient preset interval by the preset blowing intensity; When the comprehensive adjustment coefficient is greater than the maximum value of the first coefficient preset interval, the preset blowing intensity continues to be used.

4. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: An ozone decomposition device is provided at the inlet of the bag, and the method further comprises: Detect ozone concentration in the preset area of ​​the bag; When the ozone concentration exceeds a preset concentration threshold, starting the ozone decomposition device; Reduce the corona voltage of the electric bag composite dust collector.

5. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: Also includes: Detect the flue gas velocity within the preset area of ​​the bag filter; When the flue gas flow rate is higher than a preset flow rate threshold, reducing a first preset threshold of the bag filter comprises: Calculate the difference between the detected flue gas flow rate and the preset flow rate threshold, and calculate the ratio of the difference to the preset flow rate threshold, multiply the ratio by the flow rate adjustment coefficient to obtain the multiplication result, and reduce the first preset threshold of the bag based on the multiplication result.

6. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: Also includes: Detect humidity in the preset area of ​​the bag; When the humidity is lower than a preset humidity threshold, the humidity of the blowing gas is increased.

7. The method for controlling bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: Also includes: Detect dust concentration in the preset area of ​​the bag; When the dust concentration is higher than a preset concentration threshold, a mechanical vibration device or an ultrasonic cleaning device is started to clean the bags.

8. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: Also includes: The dust is pre-charged in the electric field area of ​​the electric bag composite dust collector so that the dust particles have the same charge; The pre-charged dust is introduced into the bag dust removal area, and the electrostatic repulsion between the dust particles is used to form a dust layer when the dust is deposited on the bag surface; According to the porosity of the dust layer on the surface of the bag, the electric field strength is dynamically adjusted to maintain the air permeability and peelability of the dust layer.

9. The method for controlling the bag differential pressure of an electric bag composite dust collector according to claim 8, characterized in that: The electric field strength is dynamically adjusted according to the porosity of the dust layer on the surface of the bag to maintain the air permeability and peelability of the dust layer, including: Determine whether the porosity of the dust layer is within the preset range: If the porosity is lower than the lower limit of the preset porosity interval, increasing the electric field strength; If the porosity is higher than the upper limit of the preset porosity range, the electric field strength is reduced.

10. The method for controlling bag differential pressure of an electric bag composite dust collector according to claim 1, characterized in that: Also includes: Detect the temperature in the preset area of ​​the bag; When the temperature is lower than the lowest value of the preset temperature range, the bag area is heated to prevent condensation and dust adhesion on the bag surface; When the temperature is higher than the highest value of the preset temperature range, the bag area is cooled to prevent dust combustion.

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