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the Establishment of laws of change of efficiency of process dezagregatsii from device key parametres

C by the purpose of definition of reproducibility and adequacy of values of efficiency of process dezagregatsii received during experiences have been received a design value of criterion Kohrena that is less the than tabular

Values, and also a design value of criterion of Fisher which also less tabular also makes.

These values testify about

Adequacy and reproducibility of the data received as a result of experiments. On the basis of results of experiments the regress equation is received
(4.7) in the coded sort, characterising law of change of efficiency of process dezagregatsii in which it is not defined any prenebrezhimo small factor.

η = 28,886 - 0,563∙X1 - 1,783∙X2+0,815∙X3 + 1,415∙X4 - 3,505∙X12 - 1,704∙X22 -

- 1,054∙X32 - 1,429∙X42 + 0,137∙X1∙X2 - 0,075∙X1∙X3 + 0,075∙X1∙X4 + 0,225∙X2∙X3 -

- 0,375∙X2∙X4 + 0,037∙X3∙X4 (4.7)

The analysis of factors of the given equation shows, that the greatest influence on value of efficiency of process dezagregatsii renders factor X12, character of its impact on function not the linear. Significant are X2 and X22, X42значение factors, at them-1,783 and-1,704,-1,429 accordingly. With increase in value of factor X2 value of function of the response η decreases is is connected by that at increase in height of installation of the device (parametre H∕h) in separatsionnoj to the chamber of a tape of the device are displaced from a working area of interaction with the assembly units going in krupku owing to what there are less than crushed fines particles can get to a thin product. The greatest impact among pair members renders X2 ∙ X4.

The equation in a natural sort (4.8) has been received as a result of transformations of the equation (4.6):

η =-172,041 +103,845∙H∕h+7,0920∙T∕h +1068,543∙B∕D + 4,821 ∙Ω - 0,035 ∙Ω 2

- 841,777 ∙ (H∕h) 2 1,054 ∙ (T∕h) 2 14295,000 ∙ (B∕D) 2 + 0,305 ∙Ω∙ HH - 0,007 ∙Ω∙ T∕h +

+0,750 ∙Ω∙ B∕D + 5,000HHTH - 833,333∙H∕h∙B∕D + 3,750∙T∕h∙B∕D (4.8)

In drawing 4.13 dependences of efficiency of process dezagregatsii in a dynamic separator from factors B/D, T∕hи H∕h, B/D accordingly also are presented. Change of these factors in practice is a change of design data B (width of a tape), T (a step of tapes) and H (heights of installation of the device), where h (height of the chamber of separation) and D (diameter separatsionnoj chambers) the fixed parametres of a separator.

In drawing 4.13 it is possible to see change of efficiency of separation in limits from 21,4 % to 29,4 %. The function surface parabolicheskaja also reaches peak values close to the central values of factors
Variations, for B/D=0,032, and for T/hznachenie in the centre it is equaled 3.

Function growth nabljudaetsja at change of values of factors in a direction of the central values for B/Di T/h. The minimum value of efficiency of process dezagregatsii comes at the minimum values of factors. Growth of efficiency of process dezagregatsii occurs at increase in value T/h to 3, it is caused by that at increase in a step of tapes Tобеспечивается approaching for dezagregatsii a step providing front or close to head-on collision of the assembly unit with tapes. The increase in value T/hsvyshe 3 leads to decrease in efficiency of process dezagregatsii as the corner of ascending gradient of tapes dezagregirujushchego changes aside from the most effective values for formation of particles of a crushed fines at the expense of destruction of assembly units.

Drawing of 4.13 Dependences of efficiency of process dezagregatsii from parametres

Devices: B/Di T/h, H/hi B/D

At increase in factor B/Ddo of values 0,032 growth of efficiency of process dezagregatsii is observed, that is the width of tape B increases and thus the active contact area with assembly units increases. But at the further increase of value of the factor, efficiency of process dezagregatsii starts to decrease smoothly is speaks about decrease in quantity of a small particles of assembly units formed as a result of contact to tapes. There is it because the further increase in width of tape B leads to increase in time of stay of particles at tape surfaces at skatyvanii, thus
Collision of assembly units and their destruction at contact to tapes occurs not effectively as a result dempfirovanija.

In drawing 4. 13 efficiency of process dezagregatsii varies from 19,3 to 29,8 %. The Peak value dezagregatsii reaches efficiency of process at values of factors H/h =0,090 and B/D=0,033, at the further increase in parametre B/Di reduction H/hznachenie of function decreases. The minimum value η reaches at minimum value B/D=0,019 and maximum H/h=0,155. The increase in efficiency of process dezagregatsii at increase of parametre value H/hsvjazano by that change of height H of position dezagregirujushchego devices in separatsionnoj to the chamber with 0,027 to 0,100 moves the device to a working area of more intensive interaction with assembly units where formation of particles of a crushed fines as a result dezagregatsii increases. For values of factor H/hsvyshe 0,100 function of the response η starts to decrease sharply as dezagregirujushchee the device moves above a working area of the most active interaction with assembly units. Decrease in efficiency of process dezagregatsii also takes place at values of factor B/Dnizhe 0,032 as thus there is a reduction of width of tapes B so also surfaces of contact of tapes of the device with assembly units. Increase B/Dsvyshe 0,032 leads to efficiency decrease dezagregtsii, owing to dempfirovanija assembly units.

Graphic dependences of efficiency of process dezagregatsii from combinations of factors B/Di Ω, T/hi H/hpredstavleny in drawing 4.14, accordingly. In drawing 4.14 efficiency of process dezagregatsii changes in the range from 16,8 % to 29,2 %, a peak value response function has at values B/D=0,035 and Ω =69 hailstones. The function minimum η corresponds to the least value of factor B/D=0,019 and the greatest Ω =84. Efficiency of process dezagregatsii raises with increase in width of tapes dezagregirujushchego devices B to 0,032, but still bolshy growth proishodit at increase s 56 to 69 degrees. Accordingly decrease in efficiency of process dezagregatsii occurs at increase in a corner of installation of tapes of the device from 69 degrees till the end of a range, thus decrease η at
Increase in value of factor B∕Dот of value 0,033 and further less sharp. At value of a corner Ω =69 degrees dezagregatsija occur most effectively, and the corner between a vector of speed of assembly units and tapes comes nearer to 90 degrees.

Drawing of 4.14 Dependences of efficiency of process dezagregatsii from device parametres: B/Di Ω, T∕hи H∕h

In drawing 4.14 surface of function of efficiency of process dezagregatsii has values from 19,2 % to 29,4 %. Value η reaches peak value T∕h=3,15и H∕h=0,07. Function accepts the minimum value at smaller T∕hи maximum H∕h.Рост efficiency of process dezagregatsii occurs as a result of reduction of value H∕hдо of value 0,07, but thus increase T∕hдо 3,15 also raises efficiency of process dezagregatsii. Value nachinaet decreases at change of parametres H∕hот 0,07 to 0,027 and T∕hот 3,15 to 4,409. Thus, growth of efficiency of process dezagregatsii depends on a step of installation of tapes of the device, the schedule shows, that process dezagregatsii is most effective at T∕h=3,15. The greatest influence on function growth renders parametre H∕h, here it is obvious, that the the big surface of tapes is in a working area of contact to assembly units, the it is more than particles of a thin product is formed as a result of interaction.

In drawing 4.15 dependences of efficiency of process dezagregatsii from parametres T∕hи Ω, H∕hи Ω are shown. Function of efficiency of process
dezagregatsii on schedule 4.15 changes from 18,1 to 29,0 %. The greatest value η reaches at Ω =68 degrees and T/h=3,16. From the schedule it is visible, that dezagregatsii change of a corner of installation of tapes influences efficiency of process in bolshej degrees, than parametre T/h. Function growth occurs at change of a corner from 56 to 68 degrees and at increase T/hot of the minimum value to 3,16. Further there is a sharp decrease pri increase s 68 to 84 degrees and smooth decrease at growth of value of factor T/hdo 4,409 with 3,16. The corner of installation of tapes okazyvaet considerable influence on process of interaction of tapes of the device with assembly units and on their destruction, thus a step of installation of tapes influences destruction of assembly units to a lesser degree.

Drawing 4.15 Efficiency of process dezagregatsii from T/hi Ω; i H/h

Drawing 4.15 represents dependence of change ot factors i H/h, thus efficiency varies from 15,6 to 29,3 %. The Peak value η reaches at coal of installation of tapes of 72 degrees and value H/h=0,096. A function minimum at maximum H/hi Ω. Growth of efficiency of process dezagregatsii occurs at increase in a corner of installation from 56 to 71 degrees, then there is a decrease similar to growth η. Efficiency of process dezagregatsii slightly raises at increase H/hs 0,027 to 0,096, at further increase H/heffektivnost of process dezagregatsii sharply falls, similar to a situation occurs at reduction s 72 to 56 degrees.

As a result of device installation on level 0,096 and above a tape move to a working area where it is less than assembly units as assembly units of particles of large fraction have a descending trajectory owing to what formation of particles of a crushed fines decreases, efficiency of process dezagregatsii also decreases [93]. Change of a corner of installation of tapes in the parties from the central value of the plan equally leads to decrease in efficiency of process dezagregatsii both at increase and at reduction Ω, that speaks about decrease in efficiency of process dezagregatsii as a result of increase in contacts of particles with tapes on a trajectory tangent line.

In comparison with a separator without dezagregirujushchego devices increase of efficiency of process dezagregatsii on 14,2 % from 14,6 % to 28,8 % is reached.

4.4.4

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A source: Trofimchenko Vladimir Nikolaevich. PERFECTION of PROCESS DEZAGREGATSII of PARTICLES of the MATERIAL In the DYNAMIC SEPARATOR With the DEVICE In the form of mnogozahodnyh TAPES. The dissertation on competition of a scientific degree of a Cand.Tech.Sci. Belgorod - 2017. 2017

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