CN110689640A - Risk judgment method for composite propellant mixed torque - Google Patents

Risk judgment method for composite propellant mixed torque Download PDF

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CN110689640A
CN110689640A CN201910892377.5A CN201910892377A CN110689640A CN 110689640 A CN110689640 A CN 110689640A CN 201910892377 A CN201910892377 A CN 201910892377A CN 110689640 A CN110689640 A CN 110689640A
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李锡文
苏昌银
张立新
敖维坚
张爱科
司马凱
龙杰才
詹小斌
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Huazhong University of Science and Technology
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Abstract

The invention belongs to the field of composite propellants, and particularly discloses a risk judgment method for composite propellant mixed torque, which comprises the steps of obtaining a torque early warning value coefficient and a torque safety value coefficient of a formula A; calculating the friction sensitivity degree of the formula A mixed explosion, the friction sensitivity degree of the formula A explosion critical point and the friction sensitivity degree of the formula B explosion critical point; calculating a torque early warning value correction coefficient and a torque safety value correction coefficient by using the parameters; and finally, determining a hybrid torque early warning value and a hybrid torque safety value, judging whether the actual hybrid torque is smaller than the hybrid torque safety value, if so, ensuring the safety of the hybrid process, otherwise, ensuring the safety of the hybrid process, and setting to stop the machine when the actual hybrid torque is larger than the hybrid torque early warning value. The invention sets a complete risk judgment method aiming at the torque representing the mixing safety, and can be suitable for various working conditions of all vertical mixers, thereby effectively eliminating the potential safety hazard in the mixing process and preventing explosion.

Description

Risk judgment method for composite propellant mixed torque
Technical Field
The invention belongs to the field of composite propellants, and particularly relates to a risk judgment method for composite propellant mixing torque.
Background
The main components of the composite propellant are high polymer adhesive, inorganic oxidant and combustion agent, in addition, high-energy additive, plasticizer, curing agent, curing catalyst, anti-aging agent, combustion catalyst and technological additives. The process of preparing composite propellant is to use high polymer adhesive as elastic matrix, to mix large amount of oxidant and metal fuel powder, and to extrude viscous fluid onto the surface of multiphase mixture through mechanical mixing. The mechanical mixing is a process of coating, passivating and reducing the sense of the flammable and explosive powder by mechanical force, and is an indispensable very dangerous process in the production of the explosive.
The vertical mixer is a key device for completing the mixing process of the composite propellant, the mixing safety (whether the slurry is exploded or not) of the vertical mixer is related to the sensitivity of the propellant, the volume of the slurry, the solid content, the state of the slurry, the mixing rotating speed, the viscosity of the slurry, structural parameters of the mixer and other factors, and the mixing torque value represents the magnitude of the external force acting on the slurry and is an important quantitative index of the safety. The documents on the safety research aspect of the mixed composite propellant are less reported, and no complete risk judgment method aiming at the safety of the mixture, particularly the torque safety value is formed at present. However, as the composite propellant is developed to high energy and high burning speed, its various sensitivities are increased, the danger degree is also increased, and the requirements for the safety, stability and mixing quality of mixing are increased correspondingly. In recent years, the explosion accidents of the domestic mixing machine are almost once a year, and great loss is brought to the propellant manufacturing aspect.
How to combine the past accident record, the mixed structure parameter, the process parameter and the slurry formula characteristic to establish the risk judgment method of the composite propellant mixed torque to prevent the occurrence of explosion events has great and profound significance.
Disclosure of Invention
In view of the above-mentioned drawbacks and/or needs for improvement in the prior art, the present invention provides a method for determining the risk of hybrid torque of a composite propellant, in which a friction sensitivity number is used as a determination index, and a hybrid torque warning value and a hybrid torque safety value are obtained through calculation, so as to determine the risk of hybrid torque of the composite propellant, and thus, the method is particularly suitable for applications such as the preparation of composite propellants.
In order to achieve the above object, the present invention provides a method for determining the risk of hybrid torque of a composite propellant, comprising the following steps:
s1, determining a torque explosion value, a torque early warning value and a torque safety value of the formula A according to the torque historical data of the mixed accident, and thus obtaining a torque early warning coefficient and a torque safety coefficient of the formula A;
s2, calculating the friction sensitivity degree of the mixed explosion of the formula A, the friction sensitivity degree of the explosion critical point of the formula A and the friction sensitivity degree of the explosion critical point of the formula B according to the force increment and the speed increment of the paddle;
s3, calculating a torque early warning value correction coefficient and a torque safety value correction coefficient by using the torque early warning coefficient and the torque safety coefficient of the formula A obtained in the step S1, and the friction sensitivity number of the formula A mixed explosion, the friction sensitivity number of the formula A explosion critical point and the friction sensitivity number of the formula B explosion critical point obtained in the step S2;
s4, determining a hybrid torque early warning value and a hybrid torque safety value according to the torque early warning value correction coefficient and the torque safety value correction coefficient obtained in the step S3, judging whether the actual hybrid torque is smaller than the hybrid torque safety value, if so, the hybrid process is safe, if not, the hybrid process is unsafe, and setting the device to stop when the actual hybrid torque is larger than the hybrid torque early warning value.
As a further preferred option, in step S1, the formula a torque warning coefficient is calculated by using the following formula,
Figure BDA0002209161390000021
in the formula k1Torque early warning coefficient, T, for formulation aA-mixed explosionTorque explosion value, T, for formulation AA-early warningThe torque early warning value of formula A;
the formula a torque safety factor was calculated using the following formula,
Figure BDA0002209161390000031
in the formula k2Torque safety factor, T, for formulation aA-safetyTorque safety values for formulation a.
As a further preferred, in step S2, the calculating the friction sensitivity number of the formula a mixed explosion includes the following sub-steps:
s21 calculation of the increment of force Δ P of the mixed explosive slurry of formulation A using the following formulaSlurry-mix explosion，
Figure BDA0002209161390000032
In the formula (d)BladeIs the diameter of the blade, SArea ofIs the effective stressed area of the blade;
s22 calculation of slurry velocity increment Δ v using the following equationCombination of Chinese herbs，
ΔvCombination of Chinese herbs＝(πNPublicdPublic+πNFromdBlade)
In the formula, NPublicRevolution speed of the blade, dPublicIs the revolution diameter of the blade, NFromThe rotation speed of the paddle is the rotation speed;
s23 Using Δ P obtained in the step S21Slurry-mix explosionAnd Δ v obtained in said step S22Combination of Chinese herbsThe degree of frictional sensitivity E of the mixed explosion of formulation A was calculated according to the following formulaA-mixed explosion，
Figure BDA0002209161390000033
As a further preferred, in step S2, the step of calculating the friction sensitivity number of the explosion critical point of formula a includes the following sub-steps:
s24 test for the stress increment delta P of the formula A at the explosion critical point, namely the explosion probability of 17 percentA-criticalAnd the velocity increment of the slurry Δ vA-critical；
S25 the degree of frictional sensitivity E at the explosion critical point of formulation A was calculated according to the following formulaA-critical，
Figure BDA0002209161390000034
As a further preferred, in step S2, the step of calculating the friction sensitivity number of the explosion critical point of formula B includes the following sub-steps:
s26 test for the stress increment delta P of the formula B when the explosion critical point, namely the explosion probability is 17 percentB-criticalAnd the velocity increment of the slurry Δ vB-critical；
S27 the degree of frictional sensitivity E at the explosion critical point of formulation B was calculated according to the following formulaB-critical，
Figure BDA0002209161390000041
As a further preference, the step S3 includes the following sub-steps:
S31A coefficient k for correcting the degree of friction sensitivity of formulation A was calculated according to the following equation3，
Figure BDA0002209161390000042
S32 judging degree of friction sensitivity E of formula B mixed explosionB-criticalWhether or not the degree of frictional sensitivity E is less than or equal to the explosion critical point of the formula AA-criticalIf yes, go to step S33, otherwise, go to step S34;
s33 setting a correction coefficient k of the torque early warning valueEarly warning＝k1k3While setting a torque safety value correction coefficient kSecurity＝k2k3；
S34 setting a correction coefficient k of the torque early warning valueEarly warning＝nk1k3While setting a torque safety value correction coefficient kSecurity＝nk2k3，n＞1。
More preferably, the value of n in step S34 is preferably 1.5-2.
As a further preference, the step S4 includes the following sub-steps:
s41 Using E obtained in the step S2B-criticalCalculating the torque threshold T for formulation B according toB-critical，
Figure BDA0002209161390000043
S42 using the TB-critical、kEarly warningAnd kSecurityRespectively calculating a hybrid torque early warning value T according to the following formulaHybrid early warningAnd a hybrid torque safety value THybrid security，
Figure BDA0002209161390000044
Figure BDA0002209161390000045
S43 judges the actual hybrid torque TActual mixing torqueWhether it is less than the safe value T of the mixed torqueHybrid securityIf yes, the mixing process is safe, if no, the mixing process is unsafe, and the actual mixing torque T is setActual mixing torqueIs greater thanThe hybrid torque early warning value THybrid early warningAnd stopping the machine.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the friction sensitivity number is used as a safety judgment index, and a complete risk judgment method is formulated aiming at the torque representing the mixing safety, so that guidance is provided for determining the early warning value and the safety value of the mixing torque, the method can be suitable for various working conditions of all vertical mixing machines, such as different structural parameters, process parameters and formula characteristics, further the potential safety hazard in the mixing process is effectively eliminated, the explosion accident is prevented, and the reliability is higher through the engineering verification of multiple formulas of multiple sets of vertical mixing systems;
2. particularly, the critical friction sensitivity number of the formula A and the critical friction sensitivity number of the formula B are compared to determine whether the formula B is more dangerous than the formula A, so that the torque early warning correction coefficient and the torque safety value correction coefficient are determined, the mixed torque early warning value and the mixed torque safety value can be accurately optimized, and the risk judgment is more accurate and reliable.
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Fig. 1 is a flow chart of a risk assessment method for composite propellant mixing torque provided by a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present invention provides a method for determining a risk of hybrid propellant torque, the method including the steps of:
s1 determining the torque explosion value of formula A according to the torque history data of the mixed accidentTA-mixed explosionTorque early warning value TA-early warningAnd a torque safety value TA-safetyCalculating formula A torque early warning coefficient k by respectively using formula (1) and formula (2)1And formulation A Torque safety factor k2，
Figure BDA0002209161390000061
Figure BDA0002209161390000062
S2 the degree of friction sensitivity E of the mixed explosion of formula A was calculated using the formula (3)A-mixed explosionThe degree of frictional sensitivity E at the explosion critical point of formulation AA-criticalDegree of Friction with explosion Critical Point of formulation BB-critical，
Figure BDA0002209161390000063
In the formula EFeeling of massageIs degree of frictional sensitivity, Δ POar with a rotating shaftDelta v is the increment of the drug pulp stress (average pressure of the pulp leaves to the drug pulp)Combination of Chinese herbsThe formula can comprehensively consider the influence of the structural parameters, the process parameters and the formula characteristics of the medicinal slurry on the medicinal slurry speed increment (taking the maximum linear speed of the tip of the blade);
s3 utilizes the torque early warning coefficient k of the formula A obtained in the step S11Torque safety factor k2And the degree of frictional sensitivity E of the mixed explosion of the formulation A obtained in the step S2A-mixed explosionThe degree of frictional sensitivity E at the explosion critical point of formulation AA-criticalDegree of Friction with explosion Critical Point of formulation BB-criticalCalculating a torque early warning value correction coefficient kEarly warningAnd a torque safety value correction coefficient kSecurity；
S4 uses the torque warning value correction coefficient k obtained in step S3Early warningAnd a torque safety value correction coefficient kSecurityDetermining a hybrid torque warning value THybrid early warningAnd a hybrid torque safety value THybrid securityDetermining the actual hybrid torque TPractical mixing torqueMomentWhether it is less than the safe value T of the mixed torqueHybrid securityIf yes, the mixing process is safe, if no, the mixing process is unsafe, and the actual mixing torque T is setActual mixing torqueGreater than the early warning value T of the mixed torqueHybrid early warningAnd stopping the machine.
Further, step S2 includes the following sub-steps:
s21 calculation of stress increment DeltaP of mixed explosive slurry of formula A according to formula (4)Slurry-mix explosion，
Figure BDA0002209161390000071
In the formula (d)BladeIs the diameter of the blade, SArea ofIs the effective stressed area of the blade, SArea ofThe calculation can be carried out by adopting the formula (5), and the calculation can also be obtained by carrying out simulation measurement on a three-dimensional model,
in the formula, H is a function of material height, the expression is shown in formula (6), delta is the height of the gap of the bottom of the pan, F (x) is a function of blade height, G (y) is a function of the blade width expansion line,
in the formula, WMedicineRho is the density of the medicinal slurry (rho is 100/∑ (mi/di), mi is the mass percent of the components in the formula, di is the density value of the components in the formula), V is the weight of the mixed medicinal slurryEfficient bladeThe total volume r of the paddle immersed in the slurryOar with a rotating shaftIs the blade radius (r)Oar with a rotating shaft＝dOar with a rotating shaft/2)；
S22 calculation of slurry velocity increment Deltav according to equation (7)Combination of Chinese herbs，
ΔvCombination of Chinese herbs＝(πNPublicdPublic+πNFromdBlade) (7)
In the formula NPublicRevolution speed of the blade, dPublicIs the revolution diameter of the blade, NFromThe rotation speed of the paddle is the rotation speed;
s23 Using Δ P obtained in step S21Slurry-mix explosionAnd Δ v obtained in step S22Combination of Chinese herbsThe degree of frictional sensitivity E of the mixed explosion of the formulation A was calculated from the formula (8)A-mixed explosion，
Figure BDA0002209161390000074
S24 testing stress increment delta P of the drug slurry when the explosion critical point, namely the explosion probability is 17 percent, of the formula A through a friction sensitivity instrumentA-criticalAnd the velocity increment of the slurry Δ vA-critical；
S25 the degree of frictional sensitivity E at the explosion critical point of formulation A was calculated from the formula (9)A-critical，
Figure BDA0002209161390000075
S26 testing the stress increment delta P of other formula, such as formula B, at the explosion critical point, i.e. the explosion probability of 17%B-criticalAnd the velocity increment of the slurry Δ vB-critical；
S27 is based on the formula
Figure BDA0002209161390000081
Calculating the degree of frictional sensitivity E of the explosion critical point of the formula BB-critical。
Further, step S3 includes the following sub-steps:
s31 is based on the formula
Figure BDA0002209161390000082
Calculating the frictional sensitivity number correction coefficient k of formula A3；
S32 judges whether or not formula B is more sensitive (dangerous) than formula A, i.e., satisfies EB-critical≤EA-criticalIf yes, the formula B is safer than the formula A, the step is switched to S33, and if not, the formula B is more dangerous than the formula A, the step is switched to S34;
S33 setting a torque early warning value correction coefficient kEarly warning＝k1k3While setting a torque safety value correction coefficient kSecurity＝k2k3；
S34 setting a correction coefficient k of the torque early warning valueEarly warning＝nk1k3While setting a torque safety value correction coefficient kSecurity＝nk2k3N is greater than 1, and more preferably 1.5 to 2.
Further, step S4 includes the following sub-steps:
s41 Using E obtained in step S2B-criticalAccording to the formula
Figure BDA0002209161390000083
Calculate Torque threshold T for formulation BB-criticalThe calculation formula is suitable for all vertical mixers;
s42 uses TB-critical、kEarly warningAnd kSecurityAccording to the formula respectively
Figure BDA0002209161390000084
Calculating a hybrid torque early warning value THybrid early warningAnd a hybrid torque safety value THybrid security；
S43 judges the actual hybrid torque TActual mixing torqueWhether it is less than the safe value T of the mixed torqueHybrid securityIf yes, the mixing process is safe, if no, the mixing process is unsafe, and the actual mixing torque T is setActual mixing torqueGreater than the early warning value T of the mixed torqueHybrid early warningAnd stopping the machine.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims (8)

1. A risk assessment method for hybrid propellant torque is characterized by comprising the following steps:
s1, determining a torque explosion value, a torque early warning value and a torque safety value of the formula A according to the torque historical data of the mixed accident, and thus obtaining a torque early warning coefficient and a torque safety coefficient of the formula A;
s2, calculating the friction sensitivity degree of the mixed explosion of the formula A, the friction sensitivity degree of the explosion critical point of the formula A and the friction sensitivity degree of the explosion critical point of the formula B according to the force increment and the speed increment of the paddle;
s3, calculating a torque early warning value correction coefficient and a torque safety value correction coefficient by using the torque early warning coefficient and the torque safety coefficient of the formula A obtained in the step S1, and the friction sensitivity number of the formula A mixed explosion, the friction sensitivity number of the formula A explosion critical point and the friction sensitivity number of the formula B explosion critical point obtained in the step S2;
s4, determining a hybrid torque early warning value and a hybrid torque safety value according to the torque early warning value correction coefficient and the torque safety value correction coefficient obtained in the step S3, judging whether the actual hybrid torque is smaller than the hybrid torque safety value, if so, the hybrid process is safe, if not, the hybrid process is unsafe, and setting the device to stop when the actual hybrid torque is larger than the hybrid torque early warning value.
2. The method for determining the risk of hybrid torque of a composite propellant according to claim 1, wherein in step S1, a formula A torque warning coefficient is calculated using the following formula,
in the formula k1Torque early warning coefficient, T, for formulation aA-mixed explosionTorque explosion value, T, for formulation AA-early warningThe torque early warning value of formula A;
the formula a torque safety factor was calculated using the following formula,
Figure FDA0002209161380000012
in the formula k2Torque safety factor, T, for formulation aA-safetyTorque safety values for formulation a.
3. The method for determining the risk of hybrid propellant torque as claimed in claim 1 or 2, wherein the step S2 of calculating the friction sensitivity number of the formula a hybrid explosion includes the following sub-steps:
s21 calculation of the increment of force Δ P of the mixed explosive slurry of formulation A using the following formulaSlurry-mix explosion，
In the formula (d)BladeIs the diameter of the blade, SArea ofIs the effective stressed area of the blade;
s22 calculation of slurry velocity increment Δ v using the following equationCombination of Chinese herbs，
ΔvCombination of Chinese herbs＝(πNPublicdPublic+πNFromdBlade)
In the formula, NPublicRevolution speed of the blade, dPublicIs the revolution diameter of the blade, NFromThe rotation speed of the paddle is the rotation speed;
s23 Using Δ P obtained in the step S21Slurry-mix explosionAnd Δ v obtained in said step S22Combination of Chinese herbsThe degree of frictional sensitivity E of the mixed explosion of formulation A was calculated according to the following formulaA-mixed explosion，
Figure FDA0002209161380000022
4. The method for determining the risk of hybrid propellant torque as claimed in claim 1, wherein the step S2 of calculating the friction sensitivity number of the explosion critical point of the formulation a comprises the following sub-steps:
s24 test for the stress increment delta P of the formula A at the explosion critical point, namely the explosion probability of 17 percentA-criticalAnd the velocity increment of the slurry Δ vA-critical；
S25 the degree of frictional sensitivity E at the explosion critical point of formulation A was calculated according to the following formulaA-critical，
Figure FDA0002209161380000023
5. The method for determining the risk of hybrid propellant torque as claimed in claim 1, wherein the step S2 of calculating the friction sensitivity number of the explosion critical point of the formulation B comprises the following sub-steps:
s26 test for the stress increment delta P of the formula B when the explosion critical point, namely the explosion probability is 17 percentB-criticalAnd the velocity increment of the slurry Δ vB-critical；
S27 the degree of frictional sensitivity E at the explosion critical point of formulation B was calculated according to the following formulaB-critical，
Figure FDA0002209161380000031
6. The method for determining the risk of hybrid torque of a composite propellant according to claim 1, wherein the step S3 includes the substeps of:
S31A coefficient k for correcting the degree of friction sensitivity of formulation A was calculated according to the following equation3，
Figure FDA0002209161380000032
S32 judging degree of friction sensitivity E of formula B mixed explosionB-criticalWhether or not the degree of frictional sensitivity E is less than or equal to the explosion critical point of the formula AA-criticalIf yes, go to step S33, otherwise, go to step S34;
s33 setting a correction coefficient k of the torque early warning valueEarly warning＝k1k3While setting a torque safety value correction coefficient kSecurity＝k2k3；
S34 setting a correction coefficient k of the torque early warning valueEarly warning＝nk1k3While setting a torque safety value correction coefficient kSecurity＝nk2k3，n＞1。
7. The method for determining the risk of hybrid torque of the composite propellant according to claim 6, wherein n in the step S34 preferably takes a value of 1.5-2.
8. The method for determining the risk of hybrid torque of a composite propellant according to any one of claims 1 to 7, wherein the step S4 includes the substeps of:
s41 Using E obtained in the step S2B-criticalCalculating the torque threshold T for formulation B according toB-critical，
Figure FDA0002209161380000033
S42 using the TB-critical、kEarly warningAnd kSecurityRespectively calculating a hybrid torque early warning value T according to the following formulaHybrid early warningAnd a hybrid torque safety value THybrid security，
Figure FDA0002209161380000041
Figure FDA0002209161380000042
S43 judges the actual hybrid torque TActual mixing torqueWhether it is less than the safe value T of the mixed torqueHybrid securityIf yes, the mixing process is safe, if no, the mixing process is unsafe, and the actual mixing torque T is setActual mixing torqueGreater than the early warning value T of the mixed torqueHybrid early warningAnd stopping the machine.
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