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System for optimising settling time of oil products in storage reservoirs depending on temperature distribution of oil product on height of reservoir and shape of contaminant particles. RU patent 2509354. |
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IPC classes for russian patent System for optimising settling time of oil products in storage reservoirs depending on temperature distribution of oil product on height of reservoir and shape of contaminant particles. RU patent 2509354. (RU 2509354):
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FIELD: information technology. SUBSTANCE: system includes units for identifying the base address of the section of oil products, identifying the base address of a reservoir page, generating signals for reading parameters of a section of the reservoir, recording parameters of a section of the reservoir, generating signals for calling a subprogram for calculating the settling rate of particles of the contaminant in the oil products, selecting the average settling rate of contaminant particles in the section of the reservoir, comparing said average settling rate with a standard settling rate, identifying the base address of the height of the section of the reservoir, generating signals for reading settling time codes of the oil products on sections of the storage reservoir, generating signals for calling the subprogram for calculating the inverse of the midsection coefficient, correcting the settling time of oil products in the storage reservoir based on the shape of contaminant particles, outputting settling time codes of the oil products in the storage reservoir. EFFECT: broader functional capabilities of the system by enabling analysis and processing of contaminant particles with not only a regular shape, but particles of any arbitrary shape. 14 dwg
The invention relates to the computer engineering, in particular to the optimization of time advocate of oil products in storage tanks depending on the temperature distribution of oil in a reservoir height and shape of the particle pollution, implementing the use of new information technologies in oil product storage. One way to clean fuel from mechanical impurities is defending. Preliminary sedimentation fuel allows to reduce a significant amount of mechanical impurities and water droplets before fuel filtration. The efficiency of sedimentation depends on its duration and from viscosity and density of the fuel, from the nature of the material particle pollution, their weight, size and shape. The higher the viscosity and density of a fuel and the lower the degree of correspondence form analyzed particles of pollution form spherical, the slower the deposited particles of mechanical impurities and water droplets and therefore the greater the time required for assertion of fuel. Standard on the defense of the fuel tanks of services for fuel is established by order of the Department of air transport of the Ministry of transport of the RSFSR №DV -126 from 17.10.1992, and is 4 hours on 1 meter level. This standard corresponds to the speed of sedimentation of particles of mechanical impurities within ~0,07 mm/S. However, this standard does not take into account not only the density of contamination particles, their size and shape, but also the density, viscosity and temperature of the fuel itself. In [3] is theoretically substantiated study of the processes of sedimentation fuel tanks. This the result shows that the velocity V is o (the Stokes formula) particles pollution in aviation fuel depends on the radius r C particle contamination density p C particle contamination density p T and viscosity γ T fuel V o = 2180 r C 2 γ T ( p C p T - 1 ) . ( 1 )In turn, and the fuel density p T , and viscosity of the fuel γ T is a function of temperature t of fuel: p T = p 20 - ( 0,8205 - 0,00013 * p 20 ) * ( t - 20 ) , ( 2 ) γ T = 1,8742 - 0,0362 t + 0,0007 t 2 - 10 - 5 t 3 - 10 - 7 t 4 - 10 - 7 t 5 + + 10 - 10 t 6 , ( 3 )where: t - the current temperature of fuel, p 20 - density fuel at a temperature of +20 C, specified in the passport on fuel (t=+20 C temperature standard atmospheric conditions for aviation fuel). Since the formulas (1) - (3) fair for motor fuels, related to light petroleum products and liquid petroleum oils special purpose [4], then all further arguments will build for oil products. Given this, the determination of the allowable time advocate of oil for each tank of fuel service can only be determined from consideration of the peculiarities of the distribution of temperature of oil in the height of each tank. For this distribution graph of temperature of oil in a reservoir height is divided into separate sections. As end (the end) parcel points are considered point of the graph, where the temperature measurement of oil products with a special system to control parameters of oil in a reservoir height (not shown). Each segment received split schedule is characterized by the values of the temperature on its borders. The temperature of the bottom border of one of the area equal to the temperature of the upper adjacent bottom of the plot. The breaking of the vessel stations allows you to more closely follow the changes in the speed of sedimentation of particles of pollution with petroleum products, and, consequently, to identify more precisely the time of his assertion. For this purpose by the formulas (1) - (3) are determined by the speed of sedimentation of particles of pollution for each boundary temperature in the selected area of the tank. Interpreting further speed particles pollution, obtained for the temperature of the upper border of the plot of the tank, as the speed of entering the area of the tank, and the speed of sedimentation of particles of pollution, obtained for the temperature of the bottom border of a site of the reservoir, as the rate of release from the reservoir, calculates the average speed of the particles of pollution in this section of the tank. It should be noted that in calculating the average speed of sedimentation of particulate pollution on each area of the reservoir considered and form analyzed particle pollution. Based on the concepts of «particles» as «the degree of correctness patterns or topography particles (usually the correct form of the particles are spherical)» in accordance with GOST R 51109-97 adopted by the Decree of Gosstandart of Russia from 17.12.1997, №413 and is in force since 1999, introduces definitions [5]: - middle section of the particle - size projection of a particle on a plane normal to the direction of motion of the particles, which determines the drag motion of the particles in the fluid flow»; - coefficient of the middle section - «the ratio of the area middle section to the area of a circle with a diameter equal to the largest size measured particles». The coefficient fuselage mid-section k, which is the characteristic form of particle pollution, changes in limits 0 < k ≤ 1 : ( 4 )k=1 - particle correct (spherical) shape; 0<k<1 for particles, whose form does not match the spherical form. The degree of conformity of the particle shape the spherical shape is defined by the value of the value of coefficient k fuselage mid-section. The higher the degree of conformity of the form analyzed the form of spherical particles, the closer the value of its coefficient k fuselage mid-section 1. Conversely, the lower the degree of correspondence form analyzed the form of spherical particles, the closer the value of its coefficient k fuselage mid-section to 0. Since the formulas (1) - (3) is valid only for spherical particles to apply these equations for particles of any other form in [6, p.64] under equal speeds subsidence of a spherical particle pollution diameter d EQ and arbitrary particle pollution of the same nature with maximum linear size l max and characteristic form factor middle section) the formula k d E. to in = l max k , ( 5 )where d EQ - the equivalent diameter of a spherical particle pollution, l max - maximum linear size is not spherical particle pollution, k - the coefficient of the middle section is not spherical particle pollution. While the ratio middle section k is not spherical particle pollution also has a function of l max [6, s] k = 1 - 8.45 x 10 - 2 l max - 1.25 . ( 6 )In accordance with formulas (5) and (6) particle pollution (type quartz) of the arbitrary form with maximum linear size l max will be moving (settling) toward the bottom of the tank at the same rate as the spherical particle diameter d EQ . From the point of view of safety of flights, the greatest interest is the problem of determining the time of assertion of petroleum in tanks storage for particle pollution (type quartz) of arbitrary shape and size of the form l max & GE; δ ( 7 )where l max =2r C (r, z radius of the particle pollution), δ (table 1) clearance between the spool and sleeve for various regulatory elements pump control aircraft GTE [7]. Table 1 No. p/pSpool pair equipment aircraft GTE The gap δ [mkm] 1The throttle valve - sleeve 8-12 2The valve pressure sleeve 7-9 3The control valve sleeve 10-14 4The rod - coupling 6-8 5Plunger - sleeve 15-22 6Valve relief valve sleeve 5-8Be aware that particle pollution (type quartz) the amount of 5-10 microns have very low sedimentation rate in connection with the manifestation of -diffusive equilibrium, when the velocity of the Brownian motion is approaching the speed of sedimentation (sedimentation). Therefore, to remove these particles after settling oil tanks use filtration system with filtration of less than 3 microns. Taking this into account and in accordance with table 1, the values of l max in formula (7) is taken equal 12-22 microns. Taking maximum linear size of the particle pollution (type quartz) of arbitrary shape l max = 2 r C ( 8 )and substituting it into (5), we obtain that the radius of the equivalent of a spherical particle pollution has the form r E. to in = r C k . ( 9 )Then, in accordance with (1) sedimentation rate spherical particles pollution equivalent of radius r EQ has the form V o ( r E. to in ) = 2180 * r E. to in 2 γ T ( p C p T - 1 ) . ( 10 )Substituting (9) into (10), we obtain that V o ( r E. to in ) = 2180 * r C 2 γ T ( p C p T - 1 ) * k . ( 11 )From (11) taking into account (1) and (8) we obtain that V o ( d E. to in ) = V o ( l max ) * k , ( 12 )where V is o (d EQ - the speed of sedimentation of a spherical particle pollution equivalent diameter equal to the speed of sedimentation of particulate pollution from a maximum linear size l max factor middle section k (condition (5)), V o l max ) - sedimentation rate spherical particle pollution diameter l max , k - the coefficient of the fuselage mid-section of particle pollution with maximum linear size l max . From the expression (12) it follows that the speed of sedimentation of particulate pollution (type quartz) of any arbitrary shape with maximum linear size l max factor middle section k is a factor in the settling velocity of a spherical particle contamination of the same nature diameter l max factor fuselage mid-section k, corresponding form of a spherical particle with maximum linear size l max . According to (12) average sedimentation rate for each particle pollution of arbitrary shape with maximum linear size l max and coefficient middle section k on each section of the tank can also be represented as the product of average sedimentation rate spherical particle pollution diameter l max factor middle section k is not spherical particles with maximum linear size l max . Hence, knowing the height of each section of the tank, can ratio of the height of the considered area to the average speed of the particles of pollution in this area to determine the time of particles in this area, which by analogy with (13) has the form T o ( d E. to in ) = T o ( l max ) * 1 k ' ( 14 )where T o d (EQ ) - time settling of spherical particles of pollution diameter d EQ equal to the time particles pollution is not spherical shape with maximum linear size l max factor middle section k (condition (5))T o (l max ) - the time frames for spherical particles of pollution diameter l max , 1 k- return the value of the coefficient middle section for non-spherical particles with maximum linear size l max . The expression (14) shows that the time of settling any arbitrary particles pollution (type quartz) with maximum linear size l max and characteristic of the form k is a factor in the time frames for spherical particles of pollution diameter l max , and values of the inverse coefficient middle section 1 kfor non-spherical particles with maximum linear size l max factor middle section k. The total aggregate time intervals obtained for all sections of the reservoir and will specify the estimated time of defending the oil in the reservoir. Therefore, it seems advisable to create such an automated system, which would allow to identify the readiness of oil in storage tanks to the issuance by the average speed of the particles of pollution (type quartz) of any form in each area of the tank and issuing time of defending oil product as on every separate section of the tank, and the tank. Known systems that could be used to solve the tasks set [1, 2]. The first known systems includes the Central processor module, the inlets of which are connected with the memory modules and the modules of preparation and input, and outputs are connected to the corresponding memory modules, the module is processing data, information input of which is connected to the outputs of the relevant modules of memory, clock inputs are connected to the control outputs of the Central processor module, and the module is an information system output [1]. A significant disadvantage of this system is its low performance, due to the fact that the procedures for analytical processing of data is implemented through data search through the whole database that when large amounts database inevitably leads to unnecessarily high costs of time to receive the analytical estimates. Known and another system that contains the identity module base address section of the oil product identification module base address of the page of the tank, the module of the signal conditioning read the section of the tank, the registration module parameters of the plot tank module of the signal conditioning subroutine call computing speed particles pollution, oil registration module settling velocity of the particle pollution with petroleum products, the module selection average over plot of reservoir sedimentation rate particle pollution with petroleum products, a module compare the average on area of reservoir sedimentation rate particle contamination of the oil with the regulatory sedimentation rate, identity module base address of the height of the area of the reservoir, the module of the signal conditioning reading middle section of the tank settlement acceptable time defending oil registration module middle section of the tank settlement acceptable time for the sake of oil product delivery module settlement acceptable time for the sake of oil. [2] The last of the above technical solutions of the most close to the described in the application technical solution. Purpose of invention-to expand the functionality of the system, allowing in the settling process of petroleum product into the storage tank to analyze and process the contaminates not only the right (spherical) shape, but also any other particles of arbitrary shape.
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