An adaptive adjustment method for cleaning pressure of a pleated sintered plastic plate dust collector for mining in humid environments

Abstract

An adaptive adjustment method for cleaning pressure of a pleated sintered plastic plate dust collector used in mines under humid conditions is disclosed. The method includes the following steps: defining dimensionless geometric parameters to characterize the pleated structure; constructing a dimensionless correlation function between the pleated structure parameters and the wind speed field based on the wind speed field distribution on the windward side of the sintered plastic plate in the confined underground space; constructing a mathematical model to predict dust deposition distribution in the pleated region of the sintered plastic plate based on the dimensionless correlation function; constructing a cleaning resistance correction model coupling the pleated structure and the flow field, and calculating the critical peeling stress considering the pleated structure effect; establishing a fluid-structure interaction response function covering pulse jet pressure and wall shear stress, and inverting the minimum pulse jet pressure; and implementing an adaptive graded control strategy for cleaning pressure based on the inverted minimum pulse jet pressure and the allowable equivalent stress of the coating. This invention comprehensively considers the influence of multiple factors on cleaning pressure, achieving adaptive adjustment of cleaning pressure for a pleated sintered plastic plate dust collector used in mines under humid conditions.

Description

Technical Field

[0001] This invention relates to an adaptive adjustment method for the cleaning pressure of a pleated sintered plastic plate dust collector for mining in humid environments, belonging to the field of mine dust control technology. Background Technology

[0002] Dust control in mines is characterized by high relative humidity and large dust load. Dust particles easily deliquesce on the surface of filter elements, forming a highly adhesive dust layer, making it difficult to clean the dust removal equipment and affecting the dust removal effect. Pleated sintered plastic plate dust collectors have been widely used in the field of dust control in mines due to their advantages such as high filtration accuracy and strong moisture resistance.

[0003] However, existing cleaning strategies for pleated sintered plate dust collectors are mostly based on fixed pulse jet pressure or empirical thresholds, which have the following limitations: (1) Traditional cleaning strategies are based on the pressure difference between the clean room and the filter room of the dust collector, without considering the huge liquid bridge force generated by the capillary condensation of dust particles in the high humidity environment of the mine. This results in the pulse jet cleaning pressure being set too low, the dust layer cannot be effectively peeled off, causing the plate to stick, or the cleaning pressure being set too high, causing damage to the PTFE coating on the surface of the sintered plate; (2) Sintered plates usually adopt a pleated structure to increase the filtration area, but the flow conditions in the confined space inside the dust collector are insufficient, and the airflow field is unevenly distributed, resulting in a significant difference in dust load between the bottom and top of the pleats. The bottom of the pleats is prone to forming a dead zone of airflow, making cleaning difficult, while the top of the pleats is easily eroded by the airflow, causing the coating to wear. Existing cleaning strategies mostly simplify the sintered plate to a flat plate, making it difficult to take into account the difference in dust load brought about by the pleated structure, and ignoring the coupling effect between the pleated structure and the dust load. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an adaptive adjustment method for the cleaning pressure of a mine pleated sintered plastic plate dust collector in humid environments. This method can comprehensively consider the influence of factors such as the macroscopic geometry of the pleats, airflow field, dust load, and liquid bridge force on the cleaning pressure, thereby achieving adaptive adjustment of the cleaning pressure of the mine pleated sintered plastic plate dust collector in humid environments.

[0005] To achieve the above objectives, the present invention provides a method for adaptive adjustment of the cleaning pressure of a mine-use pleated sintered plastic plate dust collector in humid environments, comprising the following steps:

[0006] S1. Obtain the fold structure parameters of the sintered plastic plate and define dimensionless fold geometric parameters to characterize the fold structure.

[0007] S2. Based on the wind speed field distribution on the windward side of the sintered plate in the confined space underground, a dimensionless correlation function between the fold structure parameters and the wind speed field is constructed.

[0008] S3. Based on the dimensionless correlation function constructed in S2, a mathematical model is built to predict the dust deposition distribution in the folded region of the sintered plate.

[0009] S4. Real-time acquisition of multi-dimensional operating parameters of the mining plastic sintered plate dust collector, construction of a dust removal resistance correction model coupled with pleated structure and flow field, and calculation of critical peeling stress considering the pleated structure effect.

[0010] S5. Using the critical peel stress as the target condition, establish a fluid-structure interaction response function that covers pulse jet pressure and wall shear stress, and invert the minimum pulse jet pressure.

[0011] S6. Based on the minimum pulse jet pressure obtained from the inversion, and combined with the coating's allowable equivalent stress, implement an adaptive graded control strategy for the cleaning pressure.

[0012] Furthermore, the specific process of S1 is as follows:

[0013] The pleated profile of the sintered plastic plate is defined as periodically distributed along the x-axis, with pleat spacing... One cycle; if the fold depth is Under the premise of approximating the single-cycle fold profile as a sinusoidal variation, the fold profile function Represented as:

[0014] ;

[0015] in, These are the position coordinates along the fold direction;

[0016] Based on fold depth and fold spacing, dimensionless geometric parameters characterizing the depth and narrowness of folds are constructed. :

[0017] ;

[0018] in, The larger the value, the greater the geometric contraction at the top and bottom of the fold.

[0019] Furthermore, the specific process of S2 is as follows:

[0020] S2.1 Due to the confined space inside the dust collector, the velocity field of the upstream flow from the sintered plastic plate is usually non-uniformly distributed. Assume the upstream flow velocity in the windward region of the sintered plastic plate is... The average inflow velocity of the sintered plate within a single cycle. The calculation is as follows:

[0021] ;

[0022] S2.2 Based on the principle of flow continuity, the normal filtration velocity on the surface of the sintered plate is inversely proportional to the width of the airflow channel. A dimensionless geometric distribution function is constructed to characterize the effect of fold-induced airflow. :

[0023] ;

[0024] in, This is the shrinkage amplification factor. The exponential term of the geometric distribution function; the shrinkage / amplification factor. Based on the Reynolds number, which is characterized by the fold spacing. Due to gas density and gas aerodynamic viscosity Parameters are calculated:

[0025] ;

[0026] in, This is a constant quantity determined by the structure of the dust collector and the flow guidance conditions;

[0027] To account for the exponential term of the geometric distribution function that enhances inertia and turbulence, based on the Reynolds number... Perform the calculation:

[0028]

[0029] in, It is a constant determined by the folded structure and fluid properties.

[0030] S2.3, Based on average filtration velocity By combining the dimensionless geometric distribution function induced by the folds with formulas (3) to (6), a dimensionless correlation function between the fold structure parameters and the wind speed field is constructed:

[0031] ;

[0032] in, This indicates the normal filtration velocity along the fold contour of the sintered plate surface.

[0033] Furthermore, the specific process of S3 is as follows:

[0034] S3.1 Based on the dimensionless correlation function, combined with the average equivalent pore diameter of the sintered plate Calculate the local Stokes number of the folded region. This is used to represent the inertial trapping tendency of sintered plastic plates for dust particles:

[0035] ;

[0036] in, To load the true density of the particles, The median particle size of the loaded particles;

[0037] S3.2. Express the local dust particle collection efficiency of the sintered plastic plate in the form of an index. :

[0038] ;

[0039] in, The specific resistance coefficient is related to the pore structure of the sintered plate and the physical properties of the dust.

[0040] S3.3, combined with the mass concentration of dust-laden airflow upstream of the sintered plate Calculate the local depositional mass flux of dust particles per unit area. :

[0041] ;

[0042] S3.4, Based on local dust particle collection efficiency A mathematical model for predicting dust deposition distribution in the folded region of the sintered plate was constructed. Formulas (8) to (10) were combined to calculate the local deposition mass at time t. :

[0043] (11);

[0044] in, This represents the time element.

[0045] The differences in dust deposition distribution in this step are used to identify local wear risk areas at the top of the folds and local blockage risk areas at the bottom of the folds, and to formulate a zoned dust removal strategy accordingly.

[0046] Furthermore, the specific process of S4 is as follows:

[0047] S4.1 In the high-humidity environment of a mine, the adhesion between the dust layer and the sintered plate interface is significantly enhanced. Based on the Kelvin equation, the capillary condensation curvature radius of the dust particles is calculated. :

[0048] ;

[0049] in, The surface tension of the liquid, The volume of the liquid is the molar volume. The gas constant is Absolute temperature Relative humidity, The equivalent contact angle between dust and the surface of the sintered plastic plate;

[0050] S4.2, Combining the pores and folds of the sintered plastic plate, there are effective capillary scales in the top and bottom areas. The difference in phenomena was analyzed, and the condensation coefficient was calculated to characterize the degree of capillary condensation. :

[0051] ;

[0052] in, The steepness coefficient is the coefficient of condensation. A coefficient approaching 1 indicates that condensation is likely to occur. A value approaching 0 indicates that condensation is unlikely to occur;

[0053] S4.3, Combine formulas (12) and (13) to calculate the Laplace pressure difference of the interfacial liquid bridge:

[0054] ;

[0055] The liquid bridge force between a single loaded dust particle and the sintered plate plane is represented by the form of "surface tension term + negative pressure suction term".

[0056] ;

[0057] in, The characteristic radius of the loaded particle;

[0058] S4.4, combined with dust layer porosity Dust particle volume, and the effective contact particle number density per unit area between the dust layer and the sintered plastic plate interface. Approximately:

[0059] ;

[0060] in, The constant quantity is related to the dust layer accumulation structure and the effectiveness of contact between dust particles and sintered plastic plates;

[0061] S4.5, Based on effective contact particle number density and shear transfer coefficient The liquid bridge force between the particles and the plane is used to calculate the equivalent adhesive shear stress between the particles and the surface of the sintered plate by combining formulas (12) to (16). :

[0062] ;

[0063] S4.6. Considering the uneven increase in dust load caused by the pleated structure, resulting in a non-uniform distribution of the dust layer's peeling resistance on the sintered plate plane, a load correction factor is introduced. :

[0064] ;

[0065] in, For constant terms, This refers to the thickness of the dust layer.

[0066] S4.7. Based on the equivalent adhesion shear stress and load correction factor, and by combining formulas (17) and (18), a calculation model for the critical peel stress of the dust layer is constructed. :

[0067] .

[0068] Furthermore, the specific process of S5 is as follows:

[0069] S5.1, Based on pulse jet pressure Using a simplified gas injection relationship, the nozzle velocity can be expressed as:

[0070] ;

[0071] in, This refers to the nozzle flow coefficient.

[0072] S5.2 Considering the influence of the non-uniformity of the folded flow field, the equivalent shear stress generated on the surface of the sintered plate under pulse jet blowing is... This can be represented using a pressure-shear force mapping:

[0073] ;

[0074] in, , A constant related to nozzle diameter and pleat geometry;

[0075] Substituting formula (21) into formula (20), we get:

[0076] ;

[0077] S5.2. Effective dust removal from the sintered plastic plate requires that the critical shear stress on the surface generated by pulse jet cleaning be no less than the critical peel stress of the dust layer, i.e.:

[0078] ;

[0079] Combining formulas (22) and (23), we can inversely determine the minimum pulse jet pressure that satisfies the dust layer stripping condition:

[0080] .

[0081] Furthermore, the specific process of S6 is as follows:

[0082] S6.1 To avoid damaging the PTFE coating on the surface of the sintered plastic sheet due to excessive blowing pressure, and considering the allowable equivalent stress of the coating... Calculate the upper limit of the injection pressure:

[0083] ;

[0084] In the formula, This represents the upper limit of the allowable blowing pressure at position x and time t. The transmission attenuation coefficient for pulse jet pressure converted into coating shear stress;

[0085] S6.2. Based on the calculated minimum pulse jet pressure and the upper limit of the allowable jet pressure, implement an adaptive graded control strategy for the dust removal pressure:

[0086] Under normal operating conditions, if Then adjust the pulse pressure as follows: Perform a single pulse cleaning operation;

[0087] Under extreme operating conditions: If The limiting pulse pressure is The duration of a single pulse is divided into several sub-pulses, and a series of modulated pulse cleaning operations are performed; the series of modulated pulse cleaning operations decompose a single long pulse into a group containing One, single pulse width is The pulse interval period is The short-pulse series, while ensuring safe blowing pressure, continuously impacts and induces the plastic sintering plate to generate reciprocating acceleration, utilizing mechanical inertia to assist in the peeling of the dust layer. The specific execution logic is as follows:

[0088] ;

[0089] in, The pulse control signal function represents the control signal supplied to the electromagnetic pulse valve; This is a rectangular function representing the switching action of the electromagnetic pulse valve, indicating the intermittent blowing characteristics of the pulsed airflow.

[0090] This invention characterizes the folded structure by defining dimensionless folded geometric parameters and constructs a dimensionless correlation function between the folded structure parameters and the wind speed field based on the wind speed field distribution on the windward side of the sintered plate in the confined space underground. Based on this dimensionless correlation function, a mathematical model is constructed to predict the dust deposition distribution in the folded region of the sintered plate. By real-time sensing of the multi-dimensional operating parameters of the mine sintered plate dust collector, a dust removal resistance correction model coupling the folded structure and the flow field is constructed. The critical peeling stress considering the folded structure effect is calculated. Finally, using the critical peeling stress as the target condition, a fluid-structure interaction response function covering pulse jet pressure and wall shear stress is established. The minimum pulse jet pressure is inverted, and combined with the coating's allowable equivalent stress, an adaptive graded control strategy for dust removal pressure is implemented. This invention establishes a fluid-structure interaction response function including pulse jet pressure, pleated flow field distribution, and wall shear stress. Using the calculated critical peeling stress as the target, the minimum pulse jet pressure that satisfies the dust removal conditions is derived. While ensuring the dust removal effect, it overcomes the limitation of relying on experience to set the jet pressure, reduces compressed air consumption, and achieves energy-saving operation of the dust removal system. A series of modulated pulse cleaning strategies are proposed, which decompose a single long pulse cleaning into multiple short single pulses. Under the premise of ensuring a safe jet pressure, continuous impact induces the sintered plate to generate reciprocating acceleration. The mechanical inertial force is used to assist in the peeling of the dust layer. This can strictly limit the peak pressure of the pulse jet, protect the PTFE coating on the surface of the sintered plate from damage, and extend the service life of the sintered plate filter element. Attached Figure Description

[0091] Figure 1 This is a flowchart of the method of the present invention;

[0092] Figure 2 This is a schematic diagram of the geometric parameters of the pleated sintered plate in an embodiment of the present invention;

[0093] Figure 3 This is a schematic diagram of the liquid bridge force model in an embodiment of the present invention;

[0094] Figure 4 This is a schematic diagram of pulse jet pressure inversion and logic control in an embodiment of the present invention. Detailed Implementation

[0095] The invention will now be further described with reference to the accompanying drawings.

[0096] like Figure 1 As shown, a method for adaptive adjustment of cleaning pressure in a mine pleated sintered plastic plate dust collector for use in humid environments includes the following steps:

[0097] S1. Obtain the fold structure parameters of the sintered plastic plate and define dimensionless fold geometric parameters to characterize the fold structure.

[0098] S2. Based on the wind speed field distribution on the windward side of the sintered plate in the confined space underground, a dimensionless correlation function between the fold structure parameters and the wind speed field is constructed.

[0099] S3. Based on the dimensionless correlation function constructed in S2, a mathematical model is built to predict the dust deposition distribution in the folded region of the sintered plate.

[0100] S4. Real-time sensing of multi-dimensional operating parameters of the mining plastic sintered plate dust collector, constructing a dust removal resistance correction model coupled with the pleated structure and flow field, and calculating the critical peeling stress considering the pleated structure effect.

[0101] S5. Using the critical peel stress as the target condition, establish a fluid-structure interaction response function that covers pulse jet pressure and wall shear stress, and invert the minimum pulse jet pressure.

[0102] S6. Based on the minimum pulse jet pressure obtained from the inversion, and combined with the coating's allowable equivalent stress, implement an adaptive graded control strategy for the cleaning pressure.

[0103] The embodiments of the present invention are applied to the dust control system of a large coal mine underground tunneling face, and the selected dust removal equipment is a mine-use pleated plastic sintered plate dust collector.

[0104] In this embodiment, (1) the geometric parameters of the sintered plastic plate are first obtained through actual on-site measurement. The measured wrinkle depth is... =40 mm, fold spacing =60 mm. For example... Figure 2 As shown, the pleated profile of the sintered plate is considered as a sinusoidal function that is periodically distributed along the x-axis. The single-period pleated profile function... Represented as:

[0105]

[0106] Based on fold depth and fold spacing, dimensionless geometric parameters characterizing the depth and narrowness of folds are constructed. :

[0107] ;

[0108] (2) The wind speed distribution on the windward side of the sintered plate is obtained using a sensor array installed inside the dust collector housing. The upstream inflow velocity distribution in the windward area of ​​the sintered plate is obtained through testing. The average incoming flow velocity within a single cycle is obtained by integral calculation. Based on the principle of flow continuity, a dimensionless geometric distribution function is constructed to characterize the effect of fold-induced airflow. :

[0109] ;

[0110] Among them, the shrinkage amplification factor and exponential terms Based on Reynolds number Calculate the gas density. = 1.2 kg / m 3 Aerodynamic viscosity =1.8×10 -5 Pa·s, calculated to ≈6000. A constant quantity determined by the dust collector structure and flow conditions. , Calculation ≈1.2, ≈1.1. Then, a dimensionless correlation function is constructed:

[0111] ;

[0112] (3) Test the physical parameters of the dust and load the true density of the particles. ≈1500 kg / m 3 Median particle size ≈20 µm. (Based on the average equivalent pore diameter of the sintered plastic plate) ≈5 µm, calculate the local Stokes number of the folded region:

[0113]

[0114] Based on local capture efficiency Combined with inlet dust concentration ≈500 kg / m 3 Calculate the local deposition mass at time t. Calculation results show that the top of the folds has a high airflow velocity and a large local Stokes number, resulting in a large amount of dust deposition and a higher risk of localized wear on the sintered plate. The bottom of the folds, with its low airflow velocity and small local Stokes number, is prone to forming a loosely accumulated dust layer, which is difficult to peel off from the surface of the sintered plate with the airflow. Based on this, localized wear risk areas at the top of the folds and localized blockage risk areas at the bottom of the folds were identified.

[0115] (4) Real-time acquisition of environmental parameters, relative humidity RH=90%. Calculation of capillary condensation curvature radius based on Kelvin equation. :

[0116]

[0117] Substitute the surface tension of water ≈0.072 N / m, molar volume ≈1.8 m 3 Parameters such as / mol were calculated to obtain Value. For example... Figure 3 As shown, calculate the condensation coefficient. and the Laplace pressure difference of the liquid bridge Then, the liquid bridge force of a single particle can be obtained. Calculate the load correction factor based on the dust layer thickness. Finally, the critical peel stress of the dust layer was calculated. ;

[0118] (5) Using the critical peel stress as the target condition, establish a fluid-structure interaction response function that covers the pulse jet pressure and wall shear stress, and invert the minimum pulse jet pressure;

[0119] The necessary condition for dust removal is the wall shear stress generated by pulse jet cleaning. It must be greater than the critical peel stress ,Right now Based on the fluid-structure interaction response function encompassing pulse jet pressure and wall shear stress. Invert the minimum pulse jet pressure that satisfies the dust layer stripping condition. The maximum value calculated across the entire sintered plate area is taken as the minimum pulse jet pressure required to meet the dust removal conditions. The calculation yields... ≈0.5 MPa;

[0120] (6) Based on the minimum pulse jet pressure obtained from the inversion, and combined with the allowable equivalent stress of the coating, an adaptive graded control strategy for cleaning pressure is implemented: based on the allowable shear stress of the PTFE coating on the surface of the sintered plate. Calculate the upper limit of the injection pressure. ≈0.4 MPa. Execute as follows: Figure 4 The pulse jet pressure execution logic shown is determined. If the cleaning operation is performed with the minimum pulse jet pressure, the PTFE coating on the sintered steel plate surface will be damaged. Therefore, the pulse jet pressure is limited to 0.4 MPa, and a series of modulated pulse cleaning operations are performed, according to… Generate pulse jet control signals.

[0121] As can be seen from the above embodiments, the present invention can adjust the cleaning mode and pulse jet pressure according to the actual high humidity environment downhole and the dust load of the sintered plate. This not only avoids the phenomenon of difficult cleaning, but also protects the PTFE coating on the surface of the sintered plate, reduces the energy consumption of the pulse jet cleaning system, and extends the service life of the sintered plate.

Claims

1. A method for adaptively adjusting the cleaning pressure of a pleated sintered plastic plate dust collector for mining in humid environments, characterized in that, Includes the following steps: S1. Obtain the fold structure parameters of the sintered plastic plate and define dimensionless fold geometric parameters to characterize the fold structure. S2. Based on the wind speed field distribution on the windward side of the sintered plate in the confined space underground, a dimensionless correlation function between the fold structure parameters and the wind speed field is constructed. S3. Based on the dimensionless correlation function constructed in S2, a mathematical model is built to predict the dust deposition distribution in the folded region of the sintered plate. S4. Real-time acquisition of multi-dimensional operating parameters of the mining plastic sintered plate dust collector, construction of a dust removal resistance correction model coupled with pleated structure and flow field, and calculation of critical peeling stress considering the pleated structure effect. S5. Using the critical peel stress as the target condition, establish a fluid-structure interaction response function that covers pulse jet pressure and wall shear stress, and invert the minimum pulse jet pressure. S6. Based on the minimum pulse jet pressure obtained from the inversion, and combined with the coating's allowable equivalent stress, implement an adaptive graded control strategy for the cleaning pressure.

2. The adaptive adjustment method for cleaning pressure of a mine pleated sintered plastic plate dust collector in a humid environment according to claim 1, characterized in that, The specific process of S1 is as follows: The pleated profile of the sintered plastic plate is defined as periodically distributed along the x-axis, with pleat spacing... One cycle; if the fold depth is Under the premise of approximating the single-cycle fold profile as a sinusoidal variation, the fold profile function Represented as: ； in, These are the position coordinates along the fold direction; Based on fold depth and fold spacing, dimensionless geometric parameters characterizing the depth and narrowness of folds are constructed. : ； in, The larger the value, the greater the geometric contraction at the top and bottom of the fold.

3. The adaptive adjustment method for cleaning pressure of a mine pleated sintered plastic plate dust collector in a humid environment according to claim 2, characterized in that, The specific process of S2 is as follows: S2.1, Assume the upstream flow velocity in the windward area of ​​the sintered plastic plate is... The average inflow velocity of the sintered plate within a single cycle. The calculation is as follows: ； S2.2 Based on the principle of flow continuity, the normal filtration velocity on the surface of the sintered plate is inversely proportional to the width of the airflow channel. A dimensionless geometric distribution function is constructed to characterize the effect of fold-induced airflow. : ； in, This is the shrinkage amplification factor. The exponential term of the geometric distribution function; the shrinkage / amplification factor. Based on the Reynolds number, which is characterized by the fold spacing. Due to gas density and gas aerodynamic viscosity Parameters are calculated: ； in, This is a constant quantity determined by the structure of the dust collector and the flow guidance conditions; To account for the exponential term of the geometric distribution function that enhances inertia and turbulence, based on the Reynolds number... Perform the calculation: in, It is a constant determined by the folded structure and fluid properties. S2.3, Based on average filtration velocity By combining the dimensionless geometric distribution function induced by the folds with formulas (3) to (6), a dimensionless correlation function between the fold structure parameters and the wind speed field is constructed: ； in, This indicates the normal filtration velocity along the fold contour of the sintered plate surface.

4. The adaptive adjustment method for cleaning pressure of a mine pleated sintered plastic plate dust collector in a humid environment according to claim 3, characterized in that, The specific process of S3 is as follows: S3.1 Based on the dimensionless correlation function, combined with the average equivalent pore diameter of the sintered plate Calculate the local Stokes number of the folded region. This is used to represent the inertial trapping tendency of sintered plastic plates for dust particles: ； in, To load the true density of the particles, The median particle size of the loaded particles; S3.

2. Express the local dust particle collection efficiency of the sintered plastic plate in the form of an index. : ； in, The specific resistance coefficient is related to the pore structure of the sintered plate and the physical properties of the dust. S3.3, combined with the mass concentration of dust-laden airflow upstream of the sintered plate Calculate the local depositional mass flux of dust particles per unit area. : ； S3.4, Based on local dust particle collection efficiency A mathematical model for predicting dust deposition distribution in the folded region of the sintered plate was constructed. Formulas (8) to (10) were combined to calculate the local deposition mass at time t. : （11）； in, This represents the time element.

5. The adaptive adjustment method for cleaning pressure of a mine pleated sintered plastic plate dust collector in a humid environment according to claim 4, characterized in that, The specific process of S4 is as follows: S4.1 Calculate the capillary condensation radius of curvature of dust particles based on the Kelvin equation. : ； in, The surface tension of the liquid, The volume of the liquid is the molar volume. The gas constant is Absolute temperature Relative humidity, The equivalent contact angle between dust and the surface of the sintered plastic plate; S4.2, Combining the pores and folds of the sintered plastic plate, there are effective capillary scales in the top and bottom areas. The difference in phenomena was analyzed, and the condensation coefficient was calculated to characterize the degree of capillary condensation. : ； in, The steepness coefficient is the coefficient of condensation. A coefficient approaching 1 indicates that condensation is likely to occur. A value approaching 0 indicates that condensation is unlikely to occur; S4.3, Combine formulas (12) and (13) to calculate the Laplace pressure difference of the interfacial liquid bridge: ； The liquid bridge force between a single loaded dust particle and the sintered plate plane is represented by the form of "surface tension term + negative pressure suction term". ； in, The characteristic radius of the loaded particle; S4.4, combined with dust layer porosity Dust particle volume, and the effective contact particle number density per unit area between the dust layer and the sintered plastic plate interface. Approximately: ； in, The constant quantity is related to the dust layer accumulation structure and the effectiveness of contact between dust particles and sintered plastic plates; S4.5, Based on effective contact particle number density and shear transfer coefficient The liquid bridge force between the particles and the plane is used to calculate the equivalent adhesive shear stress between the particles and the surface of the sintered plate by combining formulas (12) to (16). : ； S4.

6. Considering the uneven increase in dust load caused by the pleated structure, resulting in a non-uniform distribution of the dust layer's peeling resistance on the sintered plate plane, a load correction factor is introduced. : ； in, For constant terms, This refers to the thickness of the dust layer. S4.

7. Based on the equivalent adhesion shear stress and load correction factor, and by combining formulas (17) and (18), a calculation model for the critical peel stress of the dust layer is constructed. : 。 6. The adaptive adjustment method for cleaning pressure of a mine pleated sintered plastic plate dust collector in a humid environment according to claim 5, characterized in that, The specific process of S5 is as follows: S5.1, Based on pulse jet pressure Using a simplified gas injection relationship, the nozzle velocity can be expressed as: ； in, This refers to the nozzle flow coefficient. S5.2 Considering the influence of the non-uniformity of the folded flow field, the equivalent shear stress generated on the surface of the sintered plate under pulse jet blowing is... This can be represented using a pressure-shear force mapping: ； in, , A constant related to nozzle diameter and pleat geometry; Substituting formula (21) into formula (20), we get: ； S5.

2. Effective dust removal from the sintered plastic plate requires that the critical shear stress on the surface generated by pulse jet cleaning be no less than the critical peel stress of the dust layer, i.e.: ； Combining formulas (22) and (23), we can inversely determine the minimum pulse jet pressure that satisfies the dust layer stripping condition: 。 7. The adaptive adjustment method for cleaning pressure of a mine pleated sintered plastic plate dust collector in a humid environment according to claim 6, characterized in that, The specific process of S6 is as follows: S6.1 To avoid damaging the PTFE coating on the surface of the sintered plastic sheet due to excessive blowing pressure, and considering the allowable equivalent stress of the coating... Calculate the upper limit of the injection pressure: ； In the formula, This represents the upper limit of the allowable blowing pressure at position x and time t. The transmission attenuation coefficient for pulse jet pressure converted into coating shear stress; S6.

2. Based on the calculated minimum pulse jet pressure and the upper limit of the allowable jet pressure, implement an adaptive graded control strategy for the dust removal pressure: Under normal operating conditions, if Then adjust the pulse pressure as follows: Perform a single pulse cleaning operation; Under extreme operating conditions: If The limiting pulse pressure is The duration of a single pulse is divided into several sub-pulses, and a series of modulated pulse cleaning operations are performed. The series of modulated pulse cleaning operations decomposes a single long pulse into a series of pulses containing... One, single pulse width is The pulse interval period is The short-pulse series, while ensuring safe blowing pressure, continuously impacts and induces the plastic sintering plate to generate reciprocating acceleration, utilizing mechanical inertia to assist in the peeling of the dust layer. The specific execution logic is as follows: ； in, The pulse control signal function represents the control signal supplied to the electromagnetic pulse valve; This is a rectangular function representing the switching action of the electromagnetic pulse valve, indicating the intermittent blowing characteristics of the pulsed airflow.

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