Determination method for safety limit parameters in propellant slurry mixing process
By using the pulp safety threshold measurement device during the propellant pulp mixing process, the status parameters are recorded and analyzed in real time and the safety limit parameters are determined, the problem of explosion risk during the propellant pulp mixing process is solved, and a safe and efficient mixing process is achieved.
Patent Information
- Application Number
- CN202510109116.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-05-06
AI Technical Summary
In the prior art, the propellant slurry mixing process has a large explosion risk, which makes it difficult to ensure safety when preparing solid propellant.
By placing the propellant slurry in the slurry safety threshold measurement device, setting and starting the operation parameters, recording the status parameters in real time, when an explosion occurs, the target status parameters at the acquisition time before the explosion are determined, and the corresponding target operation parameters are determined as the safety limit parameters based on the corresponding relationship table.
It effectively reduces the risk of explosion during the propellant slurry mixing process, ensures the safety of the mixing process, and provides safety limit parameters to guide subsequent mixing operations.
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Figure CN119935815A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of solid propellants, and in particular to a method for determining safety limit parameters of a propellant slurry mixing process. Background Art
[0002] Solid propellant is an energetic composite material with specific properties. It is the power source of various solid engines of missiles and spacecraft. It is generally obtained by mixing a liquid binder with several granular materials of different particle sizes. Since the propellant slurry contains extremely high energy, it is very easy to explode in the process of mixing the propellant slurry to prepare solid propellant.
[0003] Currently, the preparation of solid propellants is mainly based on empirical data, which leads to a greater risk of explosion during the propellant slurry mixing process. Summary of the invention
[0004] The embodiments of this specification provide a method for determining safety limit parameters of a propellant slurry mixing process to solve the problem of a large explosion risk in the propellant slurry mixing process in the prior art.
[0005] To solve the above technical problems, the embodiments of this specification are implemented as follows:
[0006] In a first aspect, the embodiments of this specification provide a method for determining safety limit parameters of a propellant slurry mixing process, comprising:
[0007] placing the propellant slurry in a slurry safety threshold determination device;
[0008] Setting a first operating parameter of the drug slurry safety threshold determination device;
[0009] Starting the drug slurry safety threshold determination device based on the first operating parameter;
[0010] During the operation of the slurry safety threshold determination device, the state parameters of the propellant slurry are recorded at each collection moment;
[0011] When it is determined that the propellant slurry in the slurry safety threshold determination device has exploded, the target state parameter recorded at a collection time before the explosion is determined;
[0012] Based on the correspondence table between operating parameters and state parameters, the target operating parameters corresponding to the target state parameters are determined, and the target operating parameters are used as safety limit parameters of the propellant slurry mixing process; wherein the correspondence table is used to characterize the one-to-one correspondence between operating parameters and state parameters.
[0013] An embodiment of the present specification realizes the following beneficial effects: a measurement test is performed on the propellant slurry in a slurry safety threshold measurement device, and the state parameters of the propellant slurry in the slurry safety threshold measurement device at a sampling time before the explosion are obtained, and the target operating parameters corresponding to the state parameters are determined, and the target operating parameters are used as the safety limit parameters of the propellant slurry mixing process, so that the propellant slurry can be mixed according to the safety limit parameters subsequently, thereby reducing the risk of explosion during the propellant slurry mixing process and ensuring the safety of the propellant slurry mixing process. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0015] Figure 1 A schematic flow chart of a method for determining safety limit parameters of a propellant slurry mixing process provided in an embodiment of this specification;
[0016] Figure 2 A schematic diagram of an application scenario of a method for determining safety limit parameters of a propellant slurry mixing process provided in an embodiment of this specification. DETAILED DESCRIPTION
[0017] In order to make the purpose, technical solutions and advantages of one or more embodiments of this specification clearer, the technical solutions of one or more embodiments of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of one or more embodiments of this specification.
[0018] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.
[0019] A method for determining safety limit parameters of a propellant slurry mixing process provided in an embodiment of the specification is specifically described in conjunction with the accompanying drawings.
[0020] Figure 1 A schematic flow chart of a method for determining safety limit parameters of a propellant slurry mixing process provided in an embodiment of this specification.
[0021] like Figure 1As shown, the process may include the following steps:
[0022] Step 110: placing the propellant slurry in a slurry safety threshold determination device.
[0023] Step 120: Setting the first operating parameter of the drug slurry safety threshold determination device.
[0024] Step 130: Start the drug slurry safety threshold determination device based on the first operating parameter.
[0025] In the examples of this specification, the experimenter puts the propellant slurry into a special slurry safety threshold determination device. The safety threshold determination device can be a device that uses a small amount of slurry for threshold determination. Only a small amount of slurry is placed in the safety threshold determination device each time, generally about 30 to 50g. Through reasonable safety settings, such as adding protective covers to key parts, setting guide grooves for flames and shock waves, etc., when the slurry explodes, it will not pose a safety threat to the surrounding environment or equipment. The slurry safety threshold determination device has sufficient strength and sealing to ensure that no leakage or accidents occur during the mixing process. Propellant slurry is generally composed of a liquid binder and several particle phase materials with different diameters. Various binders and particle phases (oxidants, metal additives) vary greatly due to different propellant formulas. Common binders include hydroxyl-terminated polybutadiene (HTPB), carboxyl-terminated polybutadiene (CTPB), various polyester polyethers, etc.; particle phase materials also vary greatly due to different types of propellants. Common ones include aluminum powder (Al) and ammonium perchlorate (AP). Some high-energy propellants contain RDX and HMX. At present, the most commonly used propellant in China is hydroxybutyrate propellant, that is, HTPB propellant. Its binder is HTPB (specific gravity of about 11%), and the particle phase is aluminum powder (about 17) and ammonium perchlorate (about 68%). There is also a small amount (a small amount is generally less than 5% of the total specific gravity of the above several types) of curing agent, anti-aging agent, and process aid. The propellant slurry is mixed and solidified to obtain a solid propellant.
[0026] According to the characteristics and mixing requirements of the propellant slurry, the experimenter can set the operating parameters of the slurry safety threshold determination device. The first operating parameter can be the operating parameter of the slurry safety threshold determination device, and the operating parameter can be multiple parameters. According to the set operating parameters, the slurry safety threshold determination device is started to work, and the slurry safety threshold determination device mixes the propellant slurry according to the preset parameters.
[0027] In practical applications, operating parameters can be set according to relevant process requirements.
[0028] Step 140: During the operation of the slurry safety threshold determination device, the state parameters of the propellant slurry are recorded at each collection moment.
[0029] In the embodiments of this specification, the physical properties of the propellant slurry may change in real time during the mixing process due to friction or other factors, and the physical properties of the propellant slurry in different areas of the slurry safety threshold determination device may also be different.
[0030] During the operation of the slurry safety threshold determination device, it is necessary to monitor the state parameters of the propellant slurry in real time. The state parameters may include pressure, temperature, shear rate, uniformity of particle mixing, etc. The slurry safety threshold determination device may be equipped with sensors for collecting the state parameters. The time intervals for data collection of each sensor may be different or the same. For example, the time interval for data collection is 0.01 seconds. The experimenter may record the state parameters of the slurry at each collection moment of the sensor.
[0031] Step 150: When it is determined that the propellant slurry in the slurry safety threshold determination device has exploded, the target state parameter recorded at a collection time before the explosion is determined.
[0032] In the embodiments of the present specification, if the propellant slurry in the slurry safety threshold determination device is found to explode during its operation, the mixing process can be stopped immediately and the last collection time before the explosion can be determined.
[0033] At this acquisition moment, the recorded state parameters are used as target state parameters.
[0034] Step 160: Based on the correspondence table between operating parameters and state parameters, determine the target operating parameters corresponding to the target state parameters, and use the target operating parameters as safety limit parameters for the propellant slurry mixing process; wherein the correspondence table is used to characterize the one-to-one correspondence between operating parameters and state parameters.
[0035] In the embodiment of the present specification, the target operating parameters corresponding to the target state parameters are searched based on a pre-established correspondence table between operating parameters and state parameters.
[0036] These target operating parameters are used as safety limit parameters for the propellant slurry mixing process. The safety limit of each operating parameter is determined. The safety limit parameters may include a series of operating parameter values that should not be exceeded, such as maximum temperature, maximum pressure, maximum shear rate, etc. Using this parameter to mix the propellant slurry can effectively avoid the explosion of the propellant slurry.
[0037] In practical applications, after determining the safety limit parameters of the propellant slurry mixing process, the actual operating parameters of the slurry safety threshold determination device can be adjusted according to the safety limit parameters. Based on the adjusted operating parameters, the slurry safety threshold determination device is restarted to further verify the safety of the propellant slurry mixing process and effectively reduce safety risks.
[0038] It should be understood that the order of some steps in the methods described in one or more embodiments of this specification can be interchanged according to actual needs, or some steps can be omitted or deleted.
[0039] In an embodiment of the present specification, the propellant slurry is mixed in a slurry safety threshold determining device, the state parameter of the propellant slurry in the slurry safety threshold determining device at a collection time before the explosion is obtained, the target operating parameter corresponding to the state parameter is determined, and the target operating parameter is used as the safety limit parameter of the propellant slurry mixing process, so that the propellant slurry can be mixed according to the safety limit parameter subsequently, thereby reducing the risk of explosion during the propellant slurry mixing process and ensuring the safety of the propellant slurry mixing process.
[0040] based on Figure 1 The method in this specification also provides some specific implementation plans of the method, which are described below.
[0041] Optionally, before determining the target operating parameter corresponding to the target state parameter based on the operating parameter and state parameter correspondence table in the embodiments of this specification, the method may further include:
[0042] Determining a constitutive model based on rheological parameters of the propellant slurry;
[0043] Acquire a plurality of the second operating parameters of the drug mixing device under different working conditions;
[0044] The constitutive model and each of the second operating parameters are input into a simulation platform to obtain a plurality of state parameters in the propellant slurry mixing process under different working conditions; the simulation platform simulates the propellant slurry mixing process based at least on the constitutive model and the second operating parameters;
[0045] Establish a corresponding relationship table between operating parameters and status parameters.
[0046] In the embodiments of this specification, rheological parameters may include viscosity, shear rate, flow index, etc. The constitutive model is a mathematical model used to describe the relationship between material stress and strain. Determining a suitable constitutive model based on the rheological parameters of the propellant slurry can more accurately simulate the behavior of the propellant slurry during the mixing process.
[0047] The drug mixing device may refer to a device for mixing the propellant slurry in the actual production process. The second operating parameter may be the operating parameter of the drug mixing device, which collects the operating parameters of the drug mixing device under different working conditions (such as temperature, pressure, mixing speed, etc.). The determined constitutive model and the operating parameters under different working conditions are input into the simulation platform. The simulation platform is a software system that can simulate the actual physical process. It can simulate the mixing process of the propellant slurry in the drug mixing device according to the input constitutive model and operating parameters. During the simulation process, the simulation platform will calculate and output the state parameters of the propellant slurry mixing process under each working condition.
[0048] According to the simulation results, a corresponding relationship table between the operating parameters and state parameters of the mixing device is established. This table records the state parameters of the propellant slurry mixing process under different operating parameters, providing data support for subsequent parameter optimization and determination of target state parameters.
[0049] In practical applications, the various state parameters in the propellant slurry mixing process can be determined through a method that is mainly based on simulation, supplemented by theory, and verified by measurement values.
[0050] There are many constitutive models for characterizing non-Newtonian fluids, such as the Herschel-Bukely model, the Cross model, the Carreau model, etc. Each model has its own characteristics and scope of application. For example, when the yield stress of the propellant slurry is greater than 80Pa, the Herschel-Bukely model can be used, and when the yield stress of the propellant slurry is less than 30Pa, the Carreau model can be used. You can also choose a suitable constitutive model based on the experience of the experimenter.
[0051] Optionally, the constitutive model determined based on the rheological parameters of the propellant slurry in the embodiments of this specification may specifically include:
[0052] Measuring rheological parameters of the propellant slurry using a rheometer;
[0053] Preprocessing the rheological parameters to obtain target rheological parameters;
[0054] Based on the target rheological parameters, a constitutive model is determined.
[0055] In the embodiments of this specification, a rheometer is a device specifically used to measure the rheological properties of materials. After obtaining the original rheological parameters, they need to be preprocessed. The main purpose of preprocessing is to eliminate distorted samples, confirm valid parameters, and reduce the impact of errors on subsequent steps. Specifically, the measurement data can be analyzed for errors to identify and eliminate data points with large errors. Then, the remaining valid data is sorted and analyzed to obtain the target rheological parameters.
[0056] The appropriate constitutive model is determined according to the target rheological parameters. When selecting the constitutive model, factors such as the rheological properties of the propellant slurry, the accuracy of the measurement data and the applicability of the model should be considered comprehensively.
[0057] Taking the Herschel-Bukely model as an example, the Herschel-Bukely model is a constitutive model that describes the power-law Bingham fluid, and its basic expression is:
[0058]
[0059] Where, σ is the shear stress in the fluid; σ y is the yield stress; K is a parameter that characterizes the viscosity of the material. The larger the K value, the higher the fluid viscosity. is the shear rate of the slurry; n is the non-Newtonian exponent in the power law. For pseudoplastic fluids, n is less than 1.
[0060] Optionally, in the embodiments of this specification, the first operating parameters include at least geometric parameters, control parameters and environmental parameters.
[0061] Specifically, the geometric parameters may be parameters related to the structure and dimensional characteristics of the drug slurry safety threshold determination device itself, for example, the shape and size of the mixing kettle, the type, position and size of the agitator, and the like.
[0062] Control parameters can refer to those parameters that can be precisely controlled by external devices or systems, such as agitator speed, mixing time, temperature, etc.
[0063] Environmental parameters can refer to those external environmental factors that affect the mixing process, such as ambient temperature, ambient humidity, air circulation conditions, etc.
[0064] The operating parameters may also include the time of delivery of the propellant slurry, the order of delivery of each substance in the propellant slurry, the time interval for delivery of each substance, and the like.
[0065] In practical applications, the second operating parameter may be the same as the first operating parameter.
[0066] Optionally, the method described in the embodiments of this specification may also include:
[0067] When it is determined that the propellant slurry in the slurry safety threshold determination device has not exploded, obtaining a maximum control parameter for controlling the operation of the slurry safety threshold determination device;
[0068] Determining whether a control parameter in the first operating parameter is equal to the maximum control parameter;
[0069] If not, adjusting the control parameter to a target control parameter; the target control parameter is greater than the control parameter;
[0070] Based on the target control parameter, the drug slurry safety threshold determination device is restarted.
[0071] In the embodiment of this specification, when it is confirmed that the propellant slurry in the slurry safety threshold determination device has not exploded, it is determined whether the control parameter has reached the maximum control parameter of the slurry safety threshold determination device. The maximum control parameter may refer to the maximum operating condition allowed by the slurry safety threshold determination device, such as the maximum temperature, maximum pressure, maximum speed of the stirrer, etc.
[0072] If the current control parameter has not reached the maximum control parameter, the control parameter can be adjusted to the target control parameter. After adjusting the control parameter, restart the slurry safety threshold determination device, conduct a determination test on the propellant slurry, and closely monitor the operation status of the slurry safety threshold determination device and the state parameters of the propellant slurry. For example, if the current temperature set by the slurry safety threshold determination device is 50 degrees, and the maximum control temperature of the mixing device is 100 degrees, the temperature can be adjusted to 51 degrees, restart the slurry safety threshold determination device, and mix the propellant slurry.
[0073] If the current control parameter is already the maximum control parameter, it indicates that the control parameter is an insensitive factor in the propellant slurry mixing process, that is, the possibility of the control parameter causing the propellant slurry to explode during the propellant slurry mixing process is low. In this case, the geometric parameters or environmental parameters in the first operating parameter can be adjusted, such as adjusting the size and number of agitators or replacing the slurry safety threshold measuring device, and starting the slurry safety threshold measuring device according to the adjusted operating parameters to cause the propellant slurry to explode in the slurry safety threshold measuring device.
[0074] Figure 2 A schematic diagram of an application scenario of a method for determining safety limit parameters of a propellant slurry mixing process provided in an embodiment of this specification.
[0075] Step 201: obtaining rheological parameters of the propellant slurry and determining a constitutive model;
[0076] Step 202: obtaining second operating parameters of the drug mixing device under different working conditions;
[0077] Step 203: inputting the constitutive model and the second operating parameters under each working condition into the simulation platform to obtain the state parameters of the propellant slurry mixing process under each working condition;
[0078] Step 204: Establishing a corresponding relationship table between operating parameters and state parameters;
[0079] Step 205: setting a first operating parameter of the drug slurry safety threshold determination device, starting the drug slurry safety threshold determination device, and mixing the propellant drug slurry in the drug slurry safety threshold determination device;
[0080] Step 206: when it is determined that the propellant slurry in the slurry safety threshold determination device explodes, the target state parameter recorded at a collection time before the explosion is determined;
[0081] Step 207: based on the correspondence table between the operating parameters and the state parameters, determine the target operating parameters of the drug mixing device corresponding to the target state parameters, and use the target operating parameters as the safety limit parameters of the propellant slurry mixing process;
[0082] Step 208: when it is determined that the propellant slurry in the slurry safety threshold determination device has not exploded, determining whether the control parameter in the first operating parameter is equal to the maximum control parameter for controlling the operation of the slurry safety threshold determination device;
[0083] Step 209: If yes, determine that the control parameter is an insensitive factor in the propellant slurry mixing process;
[0084] Step 210: If not, adjust the control parameter to the target control parameter; if the target control parameter is greater than the control parameter, then execute step 205 to restart the drug slurry safety threshold determination device based on the target control parameter.
[0085] In practical applications, the data measured for the same propellant under the same conditions also have errors. Therefore, multiple measurement results should be provided for each data item, and error analysis and data processing should be performed on the measurement results to ensure the accuracy of the state parameters of the propellant slurry.
[0086] Determine the safety limit of each operating parameter, obtain the safety limit parameters of the propellant slurry mixing process, reduce the risk of explosion when the propellant slurry is mixed in the mixing device, and ensure the safety of the propellant slurry mixing process.
[0087] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.
[0088] The above describes specific embodiments of this specification, and other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily have to be performed in the specific order or continuous order shown to achieve the desired results. The various embodiments in this specification are described in a progressive manner, and the same and similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.
[0089] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.
[0090] The above is only an embodiment of this specification and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims
1. A method for determining safety limit parameters of a propellant slurry mixing process, characterized in that: include: placing the propellant slurry in a slurry safety threshold determination device; Setting a first operating parameter of the drug slurry safety threshold determination device; Starting the drug slurry safety threshold determination device based on the first operating parameter; During the operation of the slurry safety threshold determination device, the state parameters of the propellant slurry are recorded at each collection moment; When it is determined that the propellant slurry in the slurry safety threshold determination device has exploded, the target state parameter recorded at a collection time before the explosion is determined; Based on the correspondence table between operating parameters and state parameters, the target operating parameters corresponding to the target state parameters are determined, and the target operating parameters are used as safety limit parameters of the propellant slurry mixing process; wherein the correspondence table is used to characterize the one-to-one correspondence between operating parameters and state parameters.
2. The method according to claim 1, characterized in that Before determining the target operating parameter corresponding to the target state parameter based on the operating parameter and state parameter correspondence table, the method further includes: Determining a constitutive model based on rheological parameters of the propellant slurry; Acquire multiple second operating parameters of the drug mixing device under different working conditions; The constitutive model and each of the second operating parameters are input into a simulation platform to obtain a plurality of state parameters in the propellant slurry mixing process under different working conditions; the simulation platform simulates the propellant slurry mixing process based at least on the constitutive model and the second operating parameters; Establish a corresponding relationship table between operating parameters and status parameters.
3. The method according to claim 2, characterized in that The constitutive model is determined based on the rheological parameters of the propellant slurry, specifically comprising: Measuring rheological parameters of the propellant slurry using a rheometer; Preprocessing the rheological parameters to obtain target rheological parameters; Based on the target rheological parameters, a constitutive model is determined.
4. The method according to claim 1, characterized in that: The first operating parameters include at least geometric parameters, control parameters and environmental parameters.
5. The method according to claim 4, characterized in that The method further comprises: When it is determined that the propellant slurry in the slurry safety threshold determination device has not exploded, obtaining a maximum control parameter for controlling the operation of the slurry safety threshold determination device; Determining whether a control parameter in the first operating parameter is equal to the maximum control parameter; If not, adjusting the control parameter to a target control parameter; the target control parameter is greater than the control parameter; Based on the target control parameter, the drug slurry safety threshold determination device is restarted.