Double-field coupling dehydrator and parameter optimization therefor

Abstract

The invention discloses a double-field coupling dehydrator and an optimization method for parameters thereof. The optimization method includes: determining parameters to be optimized; carrying out simulations to the double-field coupling dehydrator according to the parameters to be optimized, separately; determining optimal ranges of the parameters to be optimized according to simulation results; determining optimized parameter combinations of the parameters to be optimized, separately; carrying out simulations to the double-field coupling dehydrator according to the optimized parameter combinations, separately; obtaining separation efficiencies of the double-field coupling dehydrator under different optimized parameter combinations; and determining an optimal parameter combination according to the separation efficiencies of the double-field coupling dehydrator. The method considers both influences of single parameters and interactions between the parameters on the separation efficiency. Based on numerical simulation results of the double-field coupling dehydrator, these influences are analyzed by a software Design-Expert to obtain an optimal parameter combination.

What is claimed is: 
     
         1 . A double-field coupling dehydrator, comprising
 an overflow pipe,   a plurality of inlets,   a straight pipe,   a first truncated cone,   a second truncated cone, and   an underflow pipe;   wherein the overflow pipe and the plurality of inlets are provided on the straight pipe; the inlets are arranged on an outer wall of the straight pipe and are tangential to a wall of the straight pipe so as to allow a liquid to enter the straight pipe at a certain speed and rotate along an inner wall of the straight pipe; the overflow pipe is arranged along an axis of the straight pipe; a high-voltage electric field is arranged between an outer wall of the overflow pipe in the straight pipe and the inner wall of the straight pipe; and the straight pipe, the first truncated cone, the second truncated cone and the underflow pipe are sequentially connected.   
     
     
         2 . The double-field coupling dehydrator of  claim 1 , wherein the outer wall of the overflow pipe is provided with a positive electrode of a high-voltage power, and the inner wall of the straight pipe is provided with a negative electrode of the high-voltage power, so that the high-voltage electric field is formed between the outer wall of the overflow pipe and the inner wall of the straight pipe. 
     
     
         3 . The double-field coupling dehydrator of  claim 1 , wherein at least two inlets are rotatablely provided on the straight pipe in an symmetrical manner. 
     
     
         4 . The double-field coupling dehydrator of  claim 1 , wherein the straight pipe, the first truncated cone, the second truncated cone and the underflow section are connected by welding to form a one-piece structure; and the overflow pipe and the straight pipe are connected via bolts. 
     
     
         5 . The double-field coupling dehydrator of  claim 1 , wherein a joint between the first and second truncated cones has a nominal diameter D of 20 mm˜22 mm; the first truncated cone has a first cone angle β of 20°˜22°; and the second truncated cone has a second cone angle α of 5°˜6°. 
     
     
         6 . A parameter optimization method for a double-field coupling dehydrator, comprising:
 determining parameters to be optimized;   simulating the double-field coupling dehydrator according to the determined parameters individually;   determining an optimal range of individual parameters according to simulation results;   determining combinations of the optimized parameters within the optimal range;   simulating the double-field coupling dehydrator according to the determined parameter combinations individually;   obtaining separation efficiencies of the double-field coupling dehydrator under individual optimized parameter combinations; and   determining an optimal parameter combination according to the separation efficiencies of the double-field coupling dehydrator.   
     
     
         7 . The parameter optimization method of  claim 6 , wherein the step of determining the optimal parameter combination comprises the following steps:
 establishing functional relationships between the individual optimized parameter combinations and the individual separation efficiencies;   carrying out a significance analysis for a model of the optimized parameter combinations according to the functional relationships;   determining whether each of the optimized parameter combinations satisfies requirements according to the significance analysis; if not, returning to the previous step for the significance analysis of other optimized parameter combinations; if yes, then determining the optimized parameter combinations;   analyzing influences of interactions of the optimized parameter combinations on the separation efficiencies; and   determining the optimal parameter combination.   
     
     
         8 . The parameter optimization method of  claim 6 , wherein the parameters to be optimized of the double-field coupling dehydrator comprise a nominal diameter D, a first cone angle β and a second cone angle α. 
     
     
         9 . The parameter optimization method of  claim 6 , wherein a joint between first and second truncated cones has a nominal diameter D of 20 mm˜22 mm; the first truncated cone has a first cone angle β of 20°˜22°, and the second truncated cone has a second cone angle α of 5°˜6°. 
     
     
         10 . The parameter optimization method of  claim 6 , wherein a multiple quadratic regression model of the functional relationships between the optimized parameter combinations and the separation efficiencies is established and calculated according to the following equations;
     E   dw =266.26−8.798 x   1 −12.43 x   2 −1.197 x   3 +0.799 x   1   x   2 +0.528 x   1   x   3 +3.166 x   2   x   3 −1.76 x   1   2 +0.101 x   2   2 +0.12 x   3   2 ;
       E   do =1716.68+11.68 x   1 −29.9 x   2 −126.5 x   3 +3.11 x   1   x   2 −8.13 x   1   x   3 −2.28 x   2   x   3 +7.72 x   1   2 +1.43 x   2   2 +5.22 x   3   2 ;
   wherein x 1 Error! Reference source not found., x 2 Error! Reference source not found. and x 3 Error! Reference source not found. correspond to α, β, and D, respectively; E dw  is the dehydration rate %; E do  is the deoiling rate %;   an optimal condition is that the dehydration rate and deoiling rate of the double-field coupling dehydrator are maximal at the same time; and   the optimal parameter combination is obtained.