A method for cleaning a concentrated emulsion separator disc

Abstract

The present application relates to concentrated latex processing equipment cleaning technical field, specifically to a kind of concentrated latex separator disc cleaning method, comprising: obtaining to be cleaned disc and protein-rubber composite gel attachment position, area and thickness, form initial inspection record and initialize cycle number;At the first rotational speed, pulse injection cleaning fluid and compressed air form gas-liquid two-phase mixed flow containing bubbles, gel is soaked and softened, and bubbles are attached to the surface of gel and the low-speed area of gasket backflow surface;After soaking, accelerate to the second rotational speed to form the same speed rotating liquid ring;Further energy consumption brake drops to the first rotational speed, produces tangential flushing and bubble breakage effect, makes gel separate from gasket backflow surface;Open discharge port to discharge and judge according to cycle number, complete confirmation after reaching threshold to form cleaning completion record.

Description

Technical Field

[0001] This invention relates to the field of cleaning technology for concentrated latex processing equipment, specifically a method for cleaning discs in a concentrated latex separator. Background Technology

[0002] Concentrated latex separators are commonly used equipment in the production of natural rubber concentrated latex. The disc group inside the drum can complete the separation of latex by centrifugation. After production, protein-rubber composite gel is easily attached to the gap between the discs and the back flow surface of the gasket. Existing cleaning methods usually involve circulating and soaking the cleaning solution, rinsing with slag discharge, or disassembling and cleaning after stopping the machine, which can clean some of the flowable areas.

[0003] As the production of concentrated latex becomes more continuous, the cleaning of separator discs is increasingly required to be completed online without changing the main structure of the equipment. However, conventional radial flow tends to form a low-speed vortex zone on the back surface of the gasket. Simply relying on soaking in the cleaning solution or ordinary rinsing is not enough to generate effective tangential shearing, resulting in insufficient peeling of the gel root, an increase in the number of cleaning cycles, and consequently affecting the subsequent operational stability and production efficiency of the separator. Summary of the Invention

[0004] The purpose of this invention is to provide a cleaning method for the discs of a concentrated latex separator, which avoids the problem that simply relying on soaking in cleaning solution or ordinary rinsing is difficult to generate effective tangential shear, resulting in insufficient peeling of the gel root on the back flow surface of the gasket. Moreover, without changing the main structure of the equipment, it is easier to generate tangential hydraulic shear and local impact pressure from bubble rupture, thereby achieving full peeling of the protein-rubber composite gel.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for cleaning the discs of a latex separator includes the following steps:

[0007] S100: Obtain the information of the disc to be cleaned and its initial state. The disc to be cleaned is placed inside the drum of a separator with a slag discharge port and has a pad with a backflow surface on its surface. The initial state information includes the position, area and thickness of the protein-rubber composite gel attached to the disc to be cleaned. Obtain the preset cleaning qualification threshold and initialize the number of cleaning cycles.

[0008] S200, pulse air intake soaking: control the separator to run at the first speed, and inject a gas-liquid two-phase mixed flow consisting of cleaning liquid and gas containing air bubbles according to the preset pulse frequency to soften the protein-rubber composite gel.

[0009] S300, accelerate ring formation: control the separator to accelerate to a second speed greater than the first speed, so that the gas-liquid two-phase mixed flow adheres to the disc to be cleaned under centrifugal force to form a liquid ring;

[0010] S400, brake flushing: When the liquid ring is rotating at the same speed, apply energy-consuming brake to the separator to reduce the speed to the first speed, generating tangential scouring and bubble breaking action, causing the protein-rubber composite gel to detach from the back flow surface of the gasket, forming the initial flushing state.

[0011] S500, Perform slag discharge check: For the initial rinsing state, open the slag discharge port to discharge the separated protein-rubber composite gel. If the number of cleaning cycles is less than the preset cleaning qualification threshold, a cyclic cleaning state is formed and the process returns to S200 to continue cleaning.

[0012] S600, complete the confirmation: if the number of cleaning cycles is not less than the preset cleaning qualification threshold, then the cleaning is confirmed to be complete and a cleaning completion record is generated.

[0013] In one possible implementation, pulsed air intake soaking includes the following steps:

[0014] S211, controls the variable frequency motor of the separator to run at the first speed, which is the low-speed soaking speed;

[0015] S212, turn on the cleaning fluid pump to inject cleaning fluid, and at the same time control the compressed air proportional solenoid valve to inject compressed air as gas at a preset pulse frequency to form a gas-liquid two-phase mixed flow.

[0016] S213, introduces a gas-liquid two-phase mixed flow into the gap between the discs to be cleaned, so that the cleaning solution chemically softens the protein-rubber composite gel.

[0017] S214, the pulsed compressed air is sheared into bubbles and the bubbles are attached to the softened protein-rubber composite gel surface and the fluid vortex zone to form an immersion state record.

[0018] In one possible implementation, the cleaning method further includes intake pulse control, which comprises the following steps:

[0019] S221, collect surface tension information of the mixture of cleaning fluid and residual latex, as well as density information of the cleaning fluid;

[0020] S222, through formula Calculate the initial equivalent radius of the attached bubble. ,in, For surface tension information, For density information, The angular velocity is based on the first rotational speed. This refers to the radial coordinate information of the inner edge of the disc to be cleaned. This is a preset gas-liquid shear constant;

[0021] S223, obtain the critical time when bubbles gather in the feed pipe of the separator and form a slug flow, set the opening time of the solenoid valve used for gas injection to be less than the critical time, and control the duty cycle to be equal to the preset ratio determined according to the critical time.

[0022] S224 executes a gas pulse injection action according to the set opening time and duty cycle to form an intake pulse setting.

[0023] In one possible implementation, accelerating ring formation includes the following steps:

[0024] S311, Collect soaking duration information and compare the soaking duration information with the preset soaking time threshold;

[0025] S312, if the soaking duration information is greater than or equal to the preset soaking time threshold, then control the separator to accelerate to the second speed with constant angular acceleration; if the soaking duration information is less than the preset soaking time threshold, then maintain the first speed and continue to perform pulse air intake soaking.

[0026] S313, under the action of centrifugal force, makes the gas-liquid two-phase mixed flow adhere closely to the disc to be cleaned, and forms a liquid ring rotating at the same speed with the drum of the separator;

[0027] S314 compresses and retains the attached air bubbles in the vortex region on the back surface of the gasket under centrifugal force, forming a liquid ring state record.

[0028] In one possible implementation, brake flushing includes the following steps:

[0029] S411, when the liquid ring is rotating at the same speed, applies energy-consuming braking to the variable frequency motor of the separator;

[0030] S412, the drum of the forced separator drops abruptly from the second speed to the first speed within a preset braking time;

[0031] S413 utilizes the rotational inertia of the fluid to cause circumferential relative sliding between the cleaning fluid in the gap between the discs to be cleaned and the discs to be cleaned after deceleration.

[0032] S414, the cleaning fluid is made to laterally impact the back flow surface of the gasket with a tangential relative sliding velocity, forming a tangential flushing state.

[0033] In one possible implementation, the cleaning method further includes braking control, which comprises the following steps:

[0034] S421, obtain the disc gap information and fluid kinematic viscosity information of the disc to be cleaned, and calculate the delay time of the cleaning fluid following the deceleration of the separator drum;

[0035] S422, Calculate the braking deceleration, which is the difference between the second speed and the first speed divided by the preset braking time;

[0036] S423, calculate the braking deceleration threshold based on the product of the second rotational speed, the delay time, and the slip determination coefficient preset based on the fluid kinematic viscosity information;

[0037] S424, if the braking deceleration is greater than the braking deceleration threshold, it is determined that tangential hydraulic shear has occurred; if the braking deceleration is less than or equal to the braking deceleration threshold, it is determined that no tangential hydraulic shear has occurred and the braking parameters are adjusted to form a braking setting.

[0038] In one possible implementation, the generation of bubble bursting includes the following steps:

[0039] S431, at the instant when the cleaning fluid laterally impacts the back flow surface of the gasket, the local dynamic pressure of the flow field at the impact point is converted into static pressure.

[0040] S432 utilizes local pressure drastic changes to cause cavitation effects in bubbles trapped in the vortex region on the back flow surface.

[0041] S433, bubbles are compressed to the critical cavitation pressure and rupture under hydraulic impact, generating local impact pressure;

[0042] S434 uses a combination of local impact pressure and tangential hydraulic shear generated by lateral impact to physically peel off the protein-rubber composite gel at its root.

[0043] In one possible implementation, the slag discharge check includes the following steps:

[0044] S511, the separator's slag discharge port is opened the instant the speed is reduced to the first rotational speed;

[0045] S512, utilizing the residual centrifugal force in the drum of the separator and the scouring force generated by the rapid drop in liquid level;

[0046] S513, close the slag discharge port and update the current cleaning cycle count;

[0047] S514, if the accumulated number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, the cleaning is deemed qualified; if the accumulated number of cleaning cycles is less than the preset cleaning qualification threshold, the cleaning is deemed unqualified and a cyclic cleaning command is triggered, forming a cyclic cleaning state.

[0048] In one possible implementation, the cleaning method further includes exception handling, which includes the following steps:

[0049] S711 detects the vibration and gas-liquid flow of the separator. If the vibration amplitude exceeds the preset vibration threshold or gas blockage occurs, it is marked as a cleaning abnormality.

[0050] S712, executes abnormal handling actions such as reducing the rotation speed or stopping the gas injection according to the type of cleaning abnormality;

[0051] S713, re-detect the vibration state and gas-liquid flow state after abnormality handling;

[0052] S714 If the vibration amplitude is less than or equal to the preset vibration threshold and no air blockage or caking occurs, return to the corresponding cleaning step to continue execution; otherwise, stop cleaning and output an abnormal record.

[0053] In one possible implementation, completing the confirmation includes the following steps:

[0054] S611, record the actual number of cleaning cycles performed and the sewage discharge status of the slag discharge port;

[0055] S612, compare the number of cleaning cycles with the preset cleaning qualification threshold;

[0056] S613 After confirming that there is no residue in the sewage discharge and the number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, a cleaning qualification record is generated.

[0057] S614, Create a cleaning completion record.

[0058] The beneficial effects of this invention are:

[0059] 1. This invention solves the problem of low-speed vortex zones easily forming on the back surface of the gasket during conventional cleaning by using a timed combination of pulsed air intake soaking, accelerated ring formation, and braking flushing. During the braking deceleration phase, the fluid rotational inertia generates circumferential relative slippage, forming tangential scouring. At the same time, it causes the bubbles trapped in the vortex zone to undergo cavitation and break up under local pressure changes. The combined effect of tangential hydraulic shearing and the local impact pressure generated by bubble breakage achieves effective physical peeling of the protein-rubber composite gel root, improving the cleaning effect of the vortex zone on the back surface of the gasket.

[0060] 2. This invention combines information such as the surface tension, density, kinematic viscosity, and disc gap of the cleaning fluid to perform targeted control of the air intake and braking processes. In the air intake pulse control, by constraining the opening time and duty cycle of the solenoid valve, it effectively avoids the formation of slug flow or air blockage in the feed pipe. In the braking control, by calculating the delay time and braking deceleration threshold, it ensures that tangential hydraulic shear can be stably generated for each braking, avoiding ineffective mechanical deceleration operations and ensuring the stability of the gas-liquid two-phase flow operation.

[0061] 3. This invention improves the online processing flow without changing the main structure of the separator; the slag discharge port is opened instantly when the speed is reduced to a low soaking speed, utilizing the residual centrifugal force in the drum and the scouring force generated by the drop in liquid level; at the same time, the system has a built-in abnormal handling mechanism for excessive vibration amplitude and air blockage and agglomeration, and uses the number of cleaning cycles and actual sewage discharge as the basis for confirmation, realizing closed-loop control of the cleaning process, ensuring the stability of the separator's subsequent operation and continuous production efficiency. Attached Figure Description

[0062] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0063] Figure 1 This is a flowchart of a cleaning method for a concentrated latex separator disc according to the present invention. Detailed Implementation

[0064] 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.

[0065] Please see Figure 1 A method for cleaning the discs of a concentrated latex separator includes the following steps:

[0066] S100: Obtain the information of the disc to be cleaned and its initial state. The disc to be cleaned is placed inside the drum of a separator with a slag discharge port and has a pad with a backflow surface on its surface. The initial state information includes the position, area and thickness of the protein-rubber composite gel attached to the disc to be cleaned. Obtain the preset cleaning qualification threshold and initialize the number of cleaning cycles.

[0067] S200, pulse air intake soaking: control the separator to run at the first speed, and inject a gas-liquid two-phase mixed flow consisting of cleaning liquid and gas containing air bubbles according to the preset pulse frequency to soften the protein-rubber composite gel.

[0068] S300, accelerate ring formation: control the separator to accelerate to a second speed greater than the first speed, so that the gas-liquid two-phase mixed flow adheres to the disc to be cleaned under centrifugal force to form a liquid ring;

[0069] S400, brake flushing: When the liquid ring is rotating at the same speed, apply energy-consuming brake to the separator to reduce the speed to the first speed, generating tangential scouring and bubble breaking action, causing the protein-rubber composite gel to detach from the back flow surface of the gasket, forming the initial flushing state.

[0070] S500, Perform slag discharge check: For the initial rinsing state, open the slag discharge port to discharge the separated protein-rubber composite gel. If the number of cleaning cycles is less than the preset cleaning qualification threshold, a cyclic cleaning state is formed and the process returns to S200 to continue cleaning.

[0071] S600, complete the confirmation: if the number of cleaning cycles is not less than the preset cleaning qualification threshold, then confirm that the cleaning is complete and generate a cleaning completion record;

[0072] The pulse air intake soaking includes the following steps: S211, controlling the variable frequency motor of the separator to run at a first speed, the first speed being the low-speed soaking speed;

[0073] S212, turn on the cleaning fluid pump to inject cleaning fluid, and at the same time control the compressed air proportional solenoid valve to inject compressed air as gas at a preset pulse frequency to form a gas-liquid two-phase mixed flow.

[0074] S213, introduces a gas-liquid two-phase mixed flow into the gap between the discs to be cleaned, so that the cleaning solution chemically softens the protein-rubber composite gel.

[0075] S214, the pulse-injected compressed air is sheared into bubbles and the bubbles are attached to the softened protein-rubber composite gel surface and fluid vortex zone to form an immersion state record;

[0076] The cleaning method also includes air intake pulse control, which includes the following steps: S221, collecting surface tension information of the mixture of cleaning fluid and residual latex and density information of the cleaning fluid;

[0077] S222, through formula Calculate the initial equivalent radius of the attached bubble. ,in, For surface tension information, For density information, The angular velocity is based on the first rotational speed. This refers to the radial coordinate information of the inner edge of the disc to be cleaned. This is a preset gas-liquid shear constant;

[0078] S223, obtain the critical time when bubbles gather in the feed pipe of the separator and form a slug flow, set the opening time of the solenoid valve used for gas injection to be less than the critical time, and control the duty cycle to be equal to the preset ratio determined according to the critical time.

[0079] S224 executes a gas pulse injection action according to the set opening time and duty cycle to form an intake pulse setting;

[0080] Further explanation: After a production batch of natural rubber concentrated latex is completed, the disc centrifuge is kept in a cleanable state. The cleaning control program reuses the original feed pipe, drum, frequency converter motor and slag discharge port of the separator, and is connected to the compressed air proportional solenoid valve through the feed pipe bypass.

[0081] The object to be cleaned is the disc assembly inside the drum. The discs are separated by spacers that are distributed radially. Conventional radial flow tends to create a low-speed region on the back surface of the spacers.

[0082] Maintain the residence time of the cleaning fluid at a low speed under the first rotational speed condition to provide a source of bubbles for generating cavitation effect in subsequent steps;

[0083] When performing S100, the operator or testing device performs an initial inspection of the disc to be cleaned and records the adhesion location, adhesion area and adhesion thickness of the protein-rubber composite gel on the disc; the above information forms the initial inspection record of the disc and is saved as the starting basis for this cleaning batch.

[0084] At the same time, the number of cleaning cycles is set to an initial value; this initial inspection record is not used to change the disc structure, but to determine whether subsequent cleaning processes need to enter the cycle cleaning;

[0085] If the adhesion thickness of a certain local area cannot be confirmed during the initial inspection, that area will still be included in the cleaning scope, and the cleaning process will not skip that area due to the lack of single thickness information; however, the missing information will be retained in the disc's initial inspection record for easy verification during the confirmation process.

[0086] When executing S200, the variable frequency motor controls the separator at the first speed; this first speed is the low-speed soaking speed, set to 10% to 20% of the rated speed of the separator, so that the cleaning fluid has a residence time in the disc gap to reach the preset soaking time threshold; after the cleaning fluid pump is started, the cleaning fluid enters the disc gap through the feed pipe;

[0087] The compressed air proportional solenoid valve opens intermittently according to a preset pulse frequency, and the compressed air and cleaning fluid form a gas-liquid two-phase mixed flow containing air bubbles in the feed channel;

[0088] Since the separator is not at high speed at this time, the cleaning fluid is mainly used to soften the protein-rubber composite gel. After the compressed air is sheared into bubbles, some bubbles enter the gap between the discs with the fluid and adhere to the softened gel surface and the low-speed area near the back flow surface of the gasket.

[0089] The cleaning control program writes the first rotation speed, the operating status of the cleaning fluid pump, the pulse execution status of the compressed air proportional solenoid valve, and the soaking duration into the soaking status record for subsequent accelerated loop forming steps to read.

[0090] If compressed air is injected into the feed pipe at a fixed pulse frequency, when the properties of the cleaning fluid change or the residual latex content is high, the air bubbles may coalesce in the feed pipe, forming a slug flow, causing air blockage or unstable flow.

[0091] Therefore, in the intake pulse control, the cleaning control program first collects the surface tension information of the mixture of cleaning fluid and residual latex, as well as the density information of the cleaning fluid, and reads the first rotational speed and the radial coordinate information of the inner edge of the disc;

[0092] The above data is used to estimate the initial equivalent radius of the attached air bubbles before they enter the disc gap;

[0093] Specifically, the formula for calculating the initial equivalent radius of the attached bubble is as follows:

[0094]

[0095] The surface tension coefficient is obtained by calculating the ratio of surface tension information to cleaning fluid density information; the first rotational speed is obtained and converted into angular velocity. The product is calculated by combining the radial coordinate information of the inner edge of the disc to obtain the local linear velocity at that coordinate.

[0096] Since fluid shear force is related to the square of the local linear velocity, and the ability of a bubble to maintain its shape is related to the kinematic surface tension coefficient, the kinematic surface tension coefficient is divided by the square of the local linear velocity and then multiplied by a preset gas-liquid shear constant. This allows us to deduce the initial equivalent radius of the bubble when it is sheared and adheres under the given shear conditions. ;

[0097] For example, if the cleaning fluid density is set to 1000 kg / m³ and the surface tension is 0.07 N / m, the calculated surface tension coefficient is 7.0 × 10⁻⁻⁻⁶. 5 Based on the m³ / s², combined with the corresponding local linear velocity and gas-liquid shear constant, the initial equivalent radius of the bubble is quantitatively calculated to be on the order of 0.5 mm. This calculation result is not directly used as the basis for the cleaning qualification, but as the constraint basis for the solenoid valve pulse setting.

[0098] Furthermore, the cleaning control program obtains the critical time when bubbles coalesce in the feed pipe and form a slug flow, and sets the opening time of the compressed air proportional solenoid valve to be less than this critical time.

[0099] The duty cycle is set according to a preset ratio determined by the critical time. For example, in a specific preferred application, the on time can be set to 0.5s, the off time can be set to 1.0s, and the duty cycle is no more than one-third.

[0100] After the settings are completed, the air intake pulse setting is written into the control record of this cleaning batch. When the S200 is executed, it directly reads the setting and no longer recalculates the bubble radius before each valve action, thereby avoiding unnecessary recalculation in the valve action of the preset control cycle during the control process.

[0101] If the surface tension or density information collected is unavailable in the current sampling period, the cleaning control program can pause updating the intake pulse setting and continue to execute the previous valid intake pulse setting.

[0102] If no previous valid setting is available, the injection of compressed air will stop, and the cleaning fluid will continue to soak at a low speed. The air intake pulse will be marked as not enabled in the soaking status record.

[0103] This treatment method does not change the low-speed soaking effect of S200, but avoids continuing to inject uncontrolled gas into the feed pipe when necessary data is lacking;

[0104] After the low-speed pulse air intake soaking is completed, the soaking status record is transferred to the subsequent steps; the accelerated loop is only entered when the disc to be cleaned is in a soaked and softened state; otherwise, the cleaning control program continues to maintain the soaking at the first speed, or stops the current cleaning process according to the abnormal handling requirements.

[0105] The initial inspection record generated by S100, the soaking status record generated by S200, and the air intake pulse generated by S224 are sequentially associated within the same cleaning batch. Subsequent steps can directly read the corresponding records without having to re-trace back the initial inspection process or the air intake calculation process.

[0106] In a preferred embodiment of the present invention, accelerated ring formation includes the following steps: S311, collecting soaking duration information and comparing the soaking duration information with a preset soaking time threshold.

[0107] S312, if the soaking duration information is greater than or equal to the preset soaking time threshold, then control the separator to accelerate to the second speed with constant angular acceleration; if the soaking duration information is less than the preset soaking time threshold, then maintain the first speed and continue to perform pulse air intake soaking.

[0108] S313, under the action of centrifugal force, makes the gas-liquid two-phase mixed flow adhere closely to the disc to be cleaned, and forms a liquid ring rotating at the same speed with the drum of the separator;

[0109] S314, the attached air bubbles are compressed and retained in the vortex region of the back flow surface of the gasket under the action of centrifugal force, forming a liquid ring state record;

[0110] Braking flushing includes the following steps: S411, applying energy-consuming braking to the variable frequency motor of the separator while the liquid ring is rotating at the same speed;

[0111] S412, the drum of the forced separator drops abruptly from the second speed to the first speed within a preset braking time;

[0112] S413 utilizes the rotational inertia of the fluid to cause circumferential relative sliding between the cleaning fluid in the gap between the discs to be cleaned and the discs to be cleaned after deceleration.

[0113] S414, the cleaning fluid is made to laterally impact the back flow surface of the gasket with a tangential relative sliding velocity, forming a tangential flushing state;

[0114] The cleaning method also includes braking control, which includes the following steps: S421, obtaining the disc gap information and fluid kinematic viscosity information of the disc to be cleaned, and calculating the delay time of the cleaning fluid following the deceleration of the separator drum;

[0115] S422, Calculate the braking deceleration, which is the difference between the second speed and the first speed divided by the preset braking time;

[0116] S423, calculate the braking deceleration threshold based on the product of the second rotational speed, the delay time, and the slip determination coefficient preset based on the fluid kinematic viscosity information;

[0117] S424, if the braking deceleration is greater than the braking deceleration threshold, it is determined that tangential hydraulic shear has occurred; if the braking deceleration is less than or equal to the braking deceleration threshold, it is determined that tangential hydraulic shear has not occurred and the braking parameters are adjusted to form a braking setting.

[0118] The generation of bubble bursting effect includes the following steps: S431, at the instant when the cleaning fluid laterally impacts the back flow surface of the gasket, the local dynamic pressure of the impact point is converted into static pressure.

[0119] S432 utilizes local pressure drastic changes to cause cavitation effects in bubbles trapped in the vortex region on the back flow surface.

[0120] S433, bubbles are compressed to the critical cavitation pressure and rupture under hydraulic impact, generating local impact pressure;

[0121] S434 uses a combination of local impact pressure and tangential hydraulic shear generated by lateral impact to physically peel off the protein-rubber composite gel at its root.

[0122] Further explanation: After the disc separator on the same natural rubber concentrate latex production line completes the low-speed pulse air intake soaking, the cleaning control program continues to execute acceleration, braking and rinsing actions based on the soaking status record;

[0123] This stage does not change the type of cleaning fluid, nor does it add an external high-pressure rinsing device. Instead, it uses the acceleration and energy-consuming braking of the variable frequency motor to make the drum, discs, and the cleaning fluid in the gap between the discs form different relative motion states at different time periods.

[0124] When S311 is executed, the cleaning control program reads the soaking status record formed in S200 and obtains the soaking duration information; this duration is compared with the preset soaking time threshold.

[0125] If the soaking duration has not yet reached the threshold, the separator continues to maintain the first rotation speed, and the cleaning liquid and bubbles are still in the low-speed soaking stage; if the soaking duration reaches or exceeds the threshold, then proceed to S312.

[0126] In S312 to S314, the variable frequency motor accelerates the separator from a first speed to a second speed at a constant angular acceleration; the second speed is greater than the first speed and is set to 30% to 50% of the separator's rated speed.

[0127] During acceleration, the gas-liquid two-phase mixture is subjected to centrifugal force, gradually adhering to the surface of the disc to be cleaned, and forming a liquid ring rotating at the same speed with the drum;

[0128] In the previous stage, the air bubbles attached to the gel surface and near the back flow surface of the gasket are compressed under the action of centrifugal force and remain in the vortex area of ​​the back flow surface of the gasket; the cleaning control program writes the second rotation speed, acceleration duration, liquid ring formation status and air bubble retention status into the liquid ring status record for use in the braking flushing step.

[0129] During braking flushing, when the liquid ring is rotating at the same speed, the cleaning control program applies energy-consuming braking to the variable frequency motor, causing the drum to drop from the second speed to the first speed within a preset braking time.

[0130] At this time, the drum and disc decelerate due to mechanical braking, while the cleaning fluid in the disc gap maintains its original rotational tendency due to its own rotational inertia, resulting in circumferential relative slippage between the cleaning fluid and the disc.

[0131] Since the gaskets are arranged along the surface of the disc, the circumferentially sliding cleaning fluid will laterally impact the back flow surface of the gaskets, thus forming a tangential flushing state; this state is recorded in the initial flushing state record as a prerequisite for slag removal inspection.

[0132] In braking control, the cleaning control program reads the disc gap information and fluid kinematic viscosity information of the disc to be cleaned, and calculates the delay time of the cleaning fluid following the drum deceleration accordingly.

[0133] Specifically, the formula for calculating the delay time of the cleaning fluid following the deceleration of the separator drum is as follows:

[0134]

[0135] The numerical values ​​of the obtained disc gap information are squared to characterize the characteristic area factor of the fluid affected by the boundary layer in the slit.

[0136] Divide the characteristic area factor by the fluid kinematic viscosity information This reflects the hysteresis effect of viscous damping on momentum transfer, and is consistent with the dimensionless structural constants pre-calibrated based on the internal geometry of the separator. Thus, the delay time can be calculated. ;

[0137] When the disc gap is 0.5 mm, the kinematic viscosity of the cleaning fluid is 1.0 × 10⁻⁻⁻⁶. 6 At m² / s, assuming a pre-calibrated dimensionless structure constant of 0.04, the calculated characteristic area factor is 2.5 × 10⁻ 7 The delay time is approximately 0.01 s when the value is m², divided by the kinematic viscosity and multiplied by a constant.

[0138] The cleaning control program calculates the braking deceleration based on the difference between the second and first speeds and the preset braking time, and then calculates the braking deceleration based on the second speed. The braking deceleration threshold is calculated by multiplying the delay time and the slip determination coefficient pre-set based on fluid kinematic viscosity information. The formula for calculating the braking deceleration threshold is defined as follows:

[0139]

[0140] When the braking deceleration is greater than the braking deceleration threshold, the cleaning control program determines that tangential hydraulic shearing can be generated, and the current braking parameters are written into the braking settings and used to execute S411 to S414.

[0141] When the braking deceleration is less than or equal to the braking deceleration threshold, the cleaning control program determines that no tangential hydraulic shearing has occurred, and adjusts the braking parameters to re-establish the braking setting. This adjustment can be achieved by shortening the preset braking time or adjusting the deceleration relationship between the second speed and the first speed, but the execution after adjustment is still limited by the allowable operating range of the separator.

[0142] If a braking setting that meets the threshold cannot be formed within the current cleaning batch, the cleaning control program will not enter the rapid deceleration flushing, but will retain the liquid ring status record and switch to abnormal handling or stop the current cleaning process to avoid repeated ineffective braking in the absence of effective crossflow.

[0143] While the tangential flushing state is being formed, the bubble bursting occurs near the back flow surface of the gasket; at the instant the cleaning fluid laterally impacts the back flow surface of the gasket, the local dynamic pressure of the flow field at the impact point is converted into static pressure, and the local pressure changes; the bubbles pre-embedded in the aforementioned low-speed soaking stage and compressed and retained in the accelerated ring-forming stage undergo cavitation under this pressure change.

[0144] When bubbles are compressed to the critical cavitation pressure and burst under hydraulic impact, local impact pressure is generated. This local impact pressure, together with the tangential hydraulic shear generated by the transverse impact, acts on the root of the protein-rubber composite gel, causing the gel to peel off from the back flow surface of the gasket and assisting in the formation of the initial flushing state.

[0145] In this process, the bubble bursting effect depends on the initial equivalent radius of the bubble and the liquid ring state provided by the preceding steps; if the air intake pulse is not marked as enabled in the preceding soaking record, the current braking flush can still generate tangential hydraulic shear, but bubble bursting effect will not be the main source of stripping.

[0146] If the liquid ring status record indicates that a stable liquid ring has not been formed in the gas-liquid two-phase mixed flow, the cleaning control program will not perform energy-consuming braking flushing, but will return to low-speed immersion or enter abnormal handling. Through this process, the sequential relationship between immersion, ring formation, braking and bubble rupture is maintained, avoiding the direct execution of subsequent actions when the state conditions are not met.

[0147] In a preferred embodiment of the present invention, the slag discharge inspection includes the following steps: S511, at the instant the speed is reduced to the first rotational speed, the slag discharge port of the separator is opened;

[0148] S512, utilizing the residual centrifugal force in the drum of the separator and the scouring force generated by the rapid drop in liquid level;

[0149] S513, close the slag discharge port and update the current cleaning cycle count;

[0150] S514, if the accumulated number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, the cleaning is deemed qualified; if the accumulated number of cleaning cycles is less than the preset cleaning qualification threshold, the cleaning is deemed unqualified and a cyclic cleaning command is triggered to form a cyclic cleaning state.

[0151] The cleaning method also includes abnormal handling, which includes the following steps: S711, the vibration state and gas-liquid flow state of the separator are detected. If the vibration amplitude is greater than the preset vibration threshold or gas blockage occurs, it is marked as a cleaning abnormality.

[0152] S712, executes abnormal handling actions such as reducing the rotation speed or stopping the gas injection according to the type of cleaning abnormality;

[0153] S713, re-detect the vibration state and gas-liquid flow state after abnormality handling;

[0154] S714 If the vibration amplitude is less than or equal to the preset vibration threshold and no air blockage or caking occurs, return to the corresponding cleaning step to continue execution; otherwise, stop cleaning and output an abnormal record.

[0155] The confirmation process includes the following steps: S611, record the actual number of cleaning cycles performed and the sewage discharge status of the slag discharge port;

[0156] S612, compare the number of cleaning cycles with the preset cleaning qualification threshold;

[0157] S613 After confirming that there is no residue in the sewage discharge and the number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, a cleaning qualification record is generated.

[0158] S614, Create a cleaning completion record.

[0159] Further explanation: After completing one braking flush, the drum of the separator on the same natural rubber concentrated latex production line has been reduced to the first speed.

[0160] At this point, some of the protein-rubber composite gel in the disc gap has detached from the back flow surface of the gasket, but may still be suspended in the drum or remain near the discharge path with the cleaning fluid; therefore, the subsequent steps discharge the detached protein-rubber composite gel through the slag discharge port, and decide whether to continue cleaning based on the number of cycles and the sludge discharge situation.

[0161] When S511 is executed, the cleaning control program opens the slag discharge port the instant the separator decelerates to the first rotation speed; at this moment, a certain amount of residual centrifugal force is still retained, and the opening of the slag discharge port will cause the liquid level in the drum to drop rapidly, and the cleaning fluid and detached dirt in the drum will be carried out.

[0162] S512 uses residual centrifugal force and the scouring force generated by the drop in liquid level to discharge the detached dirt from the drum; after the slag discharge is completed, S513 closes the slag discharge port and accumulates and updates the current cleaning cycle count.

[0163] The updated cleaning cycle count is written to the record of this cleaning batch so that subsequent judgments can directly read this updated value;

[0164] The cleaning control program compares the accumulated number of cleaning cycles with the preset cleaning qualification threshold. If the accumulated number of cleaning cycles is less than the preset cleaning qualification threshold, it is determined to be unqualified and a cycle cleaning command is triggered. The process returns to S200 and pulse air intake soaking, accelerated ring formation, braking flushing and slag discharge check are re-executed.

[0165] If the cumulative number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, the cleaning is deemed qualified and the completion confirmation is allowed. This judgment uses the number of cycles as a necessary condition to avoid prematurely ending the cleaning process due to the absence of obvious dirt in a single slag discharge.

[0166] If normal sewage discharge fails to occur after the slag discharge port is opened during the cycle, the cleaning control program will not treat this slag discharge as a normal completion result, but will retain the current cycle record and enter the abnormal handling stage.

[0167] This process is linked to the anomaly handling; the anomaly handling detects the vibration state and gas-liquid flow state of the separator; when the vibration amplitude exceeds the preset vibration threshold, or when gas blockage and caking are detected, the current cleaning batch is marked as a cleaning anomaly.

[0168] The type of cleaning anomaly determines the subsequent actions: if the anomaly is mainly manifested as vibration amplitude exceeding the preset vibration threshold, the rotation speed is reduced; if the anomaly is mainly manifested as air blockage and caking, gas injection is stopped and the cleaning fluid is kept in single-phase flow; after the anomaly is handled, the cleaning control program re-detects the vibration status and gas-liquid flow status.

[0169] If the vibration amplitude is less than or equal to the preset vibration threshold and no air blockage or caking occurs, return to the corresponding cleaning step and continue execution; otherwise, stop cleaning and output an error record.

[0170] When the number of cleaning cycles reaches the preset cleaning qualification threshold, the cleaning control program records the actual number of cleaning cycles and the sewage discharge status of the slag discharge port, and compares the number of cleaning cycles with the preset cleaning qualification threshold.

[0171] A cleaning pass record and a cleaning completion record are only generated after it is confirmed that there is no residue in the sewage discharge and the number of cleaning cycles is greater than or equal to the preset cleaning pass threshold.

[0172] If the number of cycles has reached the threshold but there is still residue discharged from the slag discharge port, no cleaning qualified record will be generated, and the cycle cleaning can continue or the record that needs to be reviewed can be output; if there is no residue discharged but the number of cycles has not yet reached the threshold, the cleaning will continue according to S514 and return to S200 until the number of cycles meets the requirements.

[0173] The cleaning completion record should at least correspond to the initial inspection record, soaking status record, liquid ring status record, braking settings, slag discharge inspection results, actual number of cycles, and abnormal record information for this cleaning batch.

[0174] The above records are used to illustrate the execution process of the cleaning process for this batch and to provide a basis for setting the cleaning parameters for the next time. In the entire implementation method, the structure of the separator disc, gasket, drum and slag discharge port does not need to be changed. The cleaning action is completed by the timing coordination of the cleaning liquid pump, the compressed air proportional solenoid valve, the frequency converter motor and the slag discharge port.

[0175] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for cleaning the discs of a concentrated latex separator, characterized in that, Includes the following steps: S100, acquire the disc to be cleaned and its initial state information. The disc to be cleaned is placed inside the drum of a separator with a slag discharge port and has a pad with a backflow surface on its surface. The initial state information includes the position, area and thickness of the protein-rubber composite gel attached to the disc to be cleaned. Acquire the preset cleaning qualification threshold and initialize the number of cleaning cycles. S200, pulse air intake soaking: control the separator to operate at the first speed, and inject a gas-liquid two-phase mixed flow consisting of cleaning liquid and gas containing air bubbles at a preset pulse frequency to soften the protein-rubber composite gel. S300, Accelerate ring formation: Control the separator to accelerate to a second speed greater than the first speed, so that the gas-liquid two-phase mixed flow adheres to the disc to be cleaned under centrifugal force to form a liquid ring; S400, brake flushing: When the liquid ring is rotating at the same speed, energy-consuming brakes are applied to the separator to reduce the speed to the first speed, generating tangential scouring and bubble bursting effects, causing the protein-rubber composite gel to detach from the back flow surface of the gasket, forming the initial flushing state; S500, Perform slag discharge check: For the initial rinsing state, open the slag discharge port to discharge the separated protein-rubber composite gel. If the number of cleaning cycles is less than the preset cleaning qualification threshold, a cyclic cleaning state is formed and the process returns to S200 to continue cleaning. S600, Confirm completion: If the number of cleaning cycles is not less than the preset cleaning qualification threshold, then confirm that the cleaning is complete and form a cleaning completion record.

2. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The pulse air intake soaking includes the following steps: S211, control the variable frequency motor of the separator to operate at the first speed, the first speed being the low-speed soaking speed; S212, turn on the cleaning fluid pump to inject the cleaning fluid, and at the same time control the compressed air proportional solenoid valve to inject compressed air as the gas at the preset pulse frequency to form the gas-liquid two-phase mixed flow. S213, the gas-liquid two-phase mixed flow is introduced into the gap between the discs to be cleaned, so that the cleaning liquid chemically softens the protein-rubber composite gel. S214, the pulsed compressed air is sheared into bubbles, and the bubbles are attached to the softened protein-rubber composite gel surface and the fluid vortex zone to form an immersion state record.

3. The cleaning method for the disc of a concentrated latex separator according to claim 2, characterized in that, The cleaning method further includes intake pulse control, which includes the following steps: S221, Collect the surface tension information of the mixture of cleaning fluid and residual latex, as well as the density information of the cleaning fluid; S222, through formula Calculate the initial equivalent radius of the attached bubble. ,in, For the surface tension information, For the density information, The angular velocity is based on the first rotational speed. This refers to the radial coordinate information of the inner edge of the disc to be cleaned. This is a preset gas-liquid shear constant; S223, obtain the critical time when bubbles gather in the feed pipe of the separator and form a slug flow, set the opening time of the solenoid valve used to inject the gas to be less than the critical time, and control the duty cycle to be equal to a preset ratio determined according to the critical time. S224 executes a gas pulse injection action according to the set opening time and duty cycle to form an intake pulse setting.

4. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The accelerated ring formation includes the following steps: S311, Collect soaking duration information and compare the soaking duration information with a preset soaking time threshold; S312, if the soaking duration information is greater than or equal to the preset soaking time threshold, then control the separator to accelerate to the second rotation speed with constant angular acceleration; if the soaking duration information is less than the preset soaking time threshold, then maintain the first rotation speed and continue pulse air intake soaking; S313, under the action of centrifugal force, the gas-liquid two-phase mixed flow is made to adhere closely to the disc to be cleaned, and form a liquid ring rotating at the same speed with the drum of the separator; S314, the attached air bubbles are compressed and retained in the vortex region of the back flow surface of the gasket under the action of centrifugal force, forming a liquid ring state record.

5. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The brake flushing includes the following steps: S411, when the liquid ring is rotating at the same speed, apply energy-consuming braking to the variable frequency motor of the separator; S412, the drum of the separator is forced to drop abruptly from the second speed to the first speed within a preset braking time; S413, by utilizing the rotational inertia of the fluid, the cleaning fluid in the gap between the discs to be cleaned and the discs to be cleaned after deceleration are made to slide relative to each other in the circumferential direction. S414, the cleaning fluid is laterally impacted on the back surface of the gasket at a tangential relative sliding speed to form a tangential flushing state.

6. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The cleaning method further includes braking control, which includes the following steps: S421 acquires the disc gap information and fluid kinematic viscosity information of the disc to be cleaned, and calculates the delay time of the cleaning fluid following the deceleration of the drum of the separator; S422, Calculate the braking deceleration, wherein the braking deceleration is the difference between the second rotational speed and the first rotational speed divided by the preset braking time; S423, calculate the braking deceleration threshold based on the product of the second rotational speed, the delay time, and the slip determination coefficient preset based on the fluid kinematic viscosity information; S424, if the braking deceleration is greater than the braking deceleration threshold, it is determined that tangential hydraulic shear has occurred; if the braking deceleration is less than or equal to the braking deceleration threshold, it is determined that no tangential hydraulic shear has occurred and the braking parameters are adjusted to form a braking setting.

7. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The bubble bursting effect is generated by the following steps: S431, at the instant when the cleaning fluid laterally impacts the back flow surface of the gasket, the local dynamic pressure of the flow field at the impact point is converted into static pressure. S432, by utilizing a sudden change in local pressure, the bubbles trapped in the vortex region on the back flow surface undergo a cavitation effect; S433, the bubble is compressed to the critical cavitation pressure and ruptures under hydraulic impact, generating local impact pressure; S434, the local impact pressure and the tangential hydraulic shear generated by the lateral impact are combined to physically peel off the root of the protein-rubber composite gel.

8. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The slag discharge inspection includes the following steps: S511, at the instant the speed is reduced to the first rotational speed, the slag discharge port of the separator is opened; S512, utilizing the residual centrifugal force in the drum of the separator and the scouring force generated by the rapid drop in liquid level; S513, close the slag discharge port and increment and update the current cleaning cycle count; S514, if the accumulated number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, the cleaning is deemed qualified; if the accumulated number of cleaning cycles is less than the preset cleaning qualification threshold, the cleaning is deemed unqualified and a cyclic cleaning command is triggered to form the cyclic cleaning state.

9. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The cleaning method further includes anomaly handling, which includes the following steps: S711, The vibration state and gas-liquid flow state of the separator are detected. If the vibration amplitude is greater than the preset vibration threshold or gas blockage occurs, it is marked as a cleaning abnormality. S712, perform abnormal handling actions such as reducing the rotation speed or stopping the injection of the gas according to the type of cleaning abnormality; S713, re-detect the vibration state and gas-liquid flow state after abnormality handling; S714, if the vibration amplitude is less than or equal to the preset vibration threshold and no air blockage or caking occurs, return to the corresponding cleaning step to continue execution; otherwise, stop cleaning and output an abnormal record.

10. The cleaning method for the disc of a concentrated latex separator according to claim 1, characterized in that, The completion confirmation includes the following steps: S611, record the actual number of cleaning cycles performed and the sewage discharge status of the slag discharge port; S612, compare the number of cleaning cycles with the preset cleaning qualification threshold; S613, after confirming that the sewage discharge is without residue and the number of cleaning cycles is greater than or equal to the preset cleaning qualification threshold, a cleaning qualification record is generated. S614, Create a cleaning completion record.

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