CN111686928A - Automatic control system and method for feeding pressure of cyclone - Google Patents
Automatic control system and method for feeding pressure of cyclone Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims description 88
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- 239000000463 material Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 4
- 239000004576 sand Substances 0.000 abstract description 11
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000008400 supply water Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
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Abstract
The invention relates to a system and a method for automatically controlling the feeding pressure of a swirler, which is characterized in that: the control system comprises a related device pipeline, an instrument and a PLC (programmable logic controller), and the control method adopts the control system and is characterized by comprising the following steps of: firstly, inputting a calculation formula; two, input P0、P10、Q0And C0Calculating k0(ii) a Thirdly, taking P1Data for Q and C calculate P; fourthly, comparing P with P0If P-P0If the | is smaller than the allowable error, returning to the step three; if P-P0If the | is larger than the allowable error, entering a fifth step; fifthly, calculating k corresponding to P, and opening the instruction after judgmentOr closing a cyclone, and making k equal to k0And returning to the third step. The advantages are that: need not to supply water, it is stable to control the pressure of giving the ore deposit through adjusting to open and close the platform number, has guaranteed that overflow and sand setting concentration are stable, is favorable to follow-up operation, and controls simply, and the cost is lower.
Description
Technical Field
The invention belongs to the technical field of ore feeding pressure control of a swirler of a concentrating mill, and particularly relates to an automatic ore feeding pressure control system and an automatic ore feeding pressure control method of a swirler.
Background
The hydrocyclone is a grading device for separating mixtures with different particle sizes by using a centrifugal force field, and is also a good concentrating and desliming device. The cyclone has the advantages of simple structure, convenient operation, large production capacity, higher classification efficiency, no rotating part, small occupied area, easy realization of automatic control and the like, and is widely applied to classification and concentration operation of a concentrating mill. In a large-scale ore dressing plant, 4-8 cyclones are usually configured into a cyclone group for production, dynamic pressure or static pressure ore feeding is usually adopted for ore feeding of the cyclone group, most of the conventional dynamic pressure ore feeding is adopted, and during production, because the liquid level of a pump pool is unstable, ore pulp pumped by a slurry pump often has an 'air-breathing' phenomenon, the ore feeding pressure of the cyclones is often in an unstable state. The product of the cyclone is an overflow product mainly of a fine fraction and a settled sand product mainly of a coarse fraction, the overflow concentration and the settled sand concentration are important indexes for evaluating the working effect of the cyclone, the subsequent sorting operation can be influenced when the overflow concentration is too high or too low, the subsequent ore grinding operation and other operations can be influenced when the settled sand concentration is too high or too low, and therefore, the overflow concentration and the settled sand concentration of the cyclone are very necessary to be stabilized. Research shows that the decisive factors influencing the concentration of the product of the cyclone are the feeding pressure and the feeding concentration at the feeding port of the cyclone. In the actual production process, the changes of the ore feeding flow and the ore feeding concentration of the cyclone often occur, even faults such as blockage of the cyclone and the like can occur, and the faults can cause the ore feeding pressure and the ore feeding concentration at the ore feeding port of the cyclone to fluctuate, so that the overflow concentration and the settled sand concentration of the cyclone are unstable, and the production is influenced.
In order to solve the problem of ensuring the stability of the feeding pressure of the cyclone, researchers have made many researches on how to control the feeding pressure and the feeding concentration of the cyclone.
The invention patent with application number 201610644520.5 discloses a method for determining the feeding pressure of a cyclone, which utilizes three-dimensional modeling software to analyze the internal flow field of the cyclone and explores the flowing condition of slurry in the cyclone under different feeding pressures so as to determine the optimal feeding pressure.
The invention patent with application number 201010524567.0 discloses an automatic control device and a control method of a hydrocyclone, which utilizes a programmable controller to realize the automatic control of the inlet ore pulp concentration, the inlet pipeline pressure and the pump pool liquid level of the hydrocyclone; however, the method needs to add water into the pump pool, so that the original concentration of the ore pulp can be changed, the stability of the overflow concentration and the sand setting concentration of the cyclone is influenced, and the difficulty is increased for the stable operation of the subsequent operation.
The utility model discloses an application number 201920050277.3 provides a make the control system of swirler steady operation, this system adjusts the ore deposit concentration and the pressure of giving the ore deposit of swirler through the rotational speed of the ore deposit pump that adjusts the pump pond and links to each other and add water. This control system is comparatively complicated, and also need add water to the pump sump, can change the original concentration of ore pulp equally, influences the stability of swirler overflow concentration and sand setting concentration, has also increased the degree of difficulty for the stable operation of follow-up operation.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an automatic control system and method for the feeding pressure of a cyclone, which control the feeding pressure of the cyclone to keep stable by automatically adjusting the opening and closing number of the cyclones, ensure the stability of the overflow concentration and the settled sand concentration index of the cyclone, are beneficial to the stable operation of subsequent operation, do not need to supplement water, and have simple operation and low cost.
The purpose of the invention is realized by the following technical scheme:
the invention discloses an automatic control system for feeding pressure of a cyclone, which comprises a PLC (programmable logic controller), and is characterized in that: the system comprises a flow meter, a concentration meter and a pressure meter which are arranged on a slurry conveying main pipeline, and an electric valve which is arranged on each slurry conveying branch pipe, wherein the flow meter, the concentration meter, the pressure meter and the electric valve are all connected with a PLC (programmable logic controller).
The invention discloses an automatic control method of feeding pressure of a swirler, which is characterized by comprising the following steps of:
step one, installing a flow meter, a concentration meter and a pressure meter on a slurry conveying main pipeline, arranging an electric valve on each slurry conveying branch pipe, and connecting the flow meter, the concentration meter, the pressure meter and the electric valve with a PLC (programmable logic controller);
step two, inputting a theoretical calculation formula
Inputting the following theoretical calculation formula into a PLC controller, specifically comprising:
in the formula (1) and the formula (2),
wherein:
p represents the calculated pressure at the feeding hole of the cyclone, and is MPa;
k is the number of opened cyclones;
P1the pressure intensity at the section of a pressure gauge of the slurry conveying main pipeline, namely the indication number of the pressure gauge, namely MPa;
q-slurry flow in main pipeline for slurry transport, i.e. number of meter indications, m3/h；
C is slurry concentration, weight percentage concentration, namely concentration indicator,%;
rho-density of slurry, kg/m3；
g-acceleration of gravity, m/s2；
S1Section area m at pressure gauge of main pipe for slurry transport2；
S-cyclone ore-feeding mouth section area, m2；
ρTrueTrue density of the material, kg/m3；
∑HfEnergy loss of a single cyclone, m;
step three, inputting P0、P10、Q0And C0K is calculated according to formula (4), formula (5), formula (6) and formula (2)0
P0For the pressure setting, Q, of the cyclone feed opening0Setting flow rate for slurry in main slurry conveying pipeline C0Setting the concentration, P, for the slurry10Is when P is equal to P0、Q＝Q0、C＝C0Pressure intensity and k at the section of a pressure gauge of a slurry conveying main pipeline0Is when P is equal to P0、Q＝Q0、C＝C0、P1＝P10The number of opened cyclones is P0、P10、Q0And C0Substituting the formula (4), the formula (5), the formula (6) and the formula (2) to calculate k0A value;
step four, calculating the pressure P at the ore feeding port of the cyclone according to the formula (1)
The PLC controller adopts the pressure P at the section of the pressure gauge of the slurry conveying main pipeline1The slurry flow rate Q and the slurry concentration C are calculated, and k is equal to k0Substituting, and calculating the pressure P at the ore feeding port of the cyclone according to a formula (1);
step five, comparing P and P0Deviation of (2)
If Δ P ═ P-P0If the | is less than or equal to the allowable error, returning to the fourth step;
if Δ P ═ P-P0If the | is greater than the allowable error, entering a sixth step;
step six, the PLC controller substitutes the P value obtained by calculation in the step three into a formula (4), a formula (5), a formula (6) and a formula (2) to calculate a k value corresponding to the P value,
if k-k0＞0
The PLC controller issues an instruction k ═ k0+1, opening an electric valve of a swirler, and then entering the sixth step;
if k-k0＜0
The PLC controller issues an instruction k ═ k 01, closing an electric valve of a cyclone, and then entering a sixth step;
step seven, making k equal to k0And returning to the step four.
Brief description of the control principles of the invention
As shown in fig. 1, the derivation processes of formula (1), formula (2), formula (4), formula (5) and formula (6) are as follows:
bernoulli equation
Selecting a section at a pressure gauge on a slurry conveying main pipeline as a first section, a section at a feeding hole of a single cyclone as a second section, and obtaining the Bernoulli equation as follows according to the law of conservation of energy by taking the first section as a zero-potential energy surface:
wherein:
Z1，Z2respectively at the first section and the second sectionA head;
p is the pressure at the feeding hole of the swirler in MPa;
P1the pressure intensity at the section of a pressure gauge of the slurry conveying main pipeline, namely the indication number of the pressure gauge, namely MPa;
rho-density of slurry, kg/m3；
g-acceleration of gravity, m/s2；
U1-slurry flow velocity m/h at the section of the pressure gauge of the main slurry conveying pipe;
U2-slurry flow velocity at the cyclone feed port, m/h;
k-the number of opened cyclones is one;
∑Hf-individual cyclone energy loss, m;
in the formula (7), the flow rate U of slurry at the section of the pressure gauge of the main slurry conveying pipeline1And the slurry flow rate U at the feeding hole of the cyclone2Can be expressed by equation (8) and equation (9), respectively:
in equations (8) and (9):
the flow rate of the slurry in the main Q-slurry conveying pipeline, i.e. the number of flow indicators, m3/h；
S1Cross-sectional area at the pressure gauge cross-section of the main pipe for transporting slurry, m2；
Cross sectional area of ore feeding port of S-cyclone, m2；
In the formula (7), the slurry density ρ is related to the true density of the material and the slurry concentration, and the specific relational expression is as follows:
in equation (3):
ρtrueTrue density of the material, kg/m3；
C-slurry concentration, weight percentage concentration, i.e. concentration number,%;
secondly, establishing a relational expression between the pressure P at the ore feeding port of the cyclone and the opening number k of the cyclones
In equation (7), the first cross section and the second cross section are selected to be at the same height, where Z is1＝Z2Substituting the formula (8) and the formula (9) into the formula (7) when the pressure is 0, and obtaining a relation formula (1) of the pressure P at the ore feeding port of the swirler and the opening number k of the swirler after deformation finishing
Thirdly, establishing a relational expression between the number k of opened cyclones and the pressure P at the ore feeding port of the cyclone
Substituting the formula (3) into the formula (1), and obtaining the formula (10) after deformation as follows:
solving the formula (10), the relation between the number k of the opened cyclones and the pressure P at the ore feeding port of the cyclone can be obtained as follows:
wherein,
compared with the prior art, the invention has the advantages that:
(1) the invention overcomes the defect that the feeding pressure of the cyclone is controlled by adding water to the pump pool, namely the water is added to change the feeding concentration of the cyclone, thereby changing the concentrations of overflow products and settled sand products of the cyclone and influencing the stable operation and effect of subsequent operation; the invention controls the feeding pressure of the cyclone by adjusting the number of the opened cyclones, does not need to add water to the pump pool to control the feeding pressure of the cyclone, and can maintain the stable feeding concentration of the cyclone, thereby ensuring the stability of concentration indexes of overflow products and settled sand products of the cyclone and being beneficial to the stable operation of subsequent operation.
(2) The invention has simple and quick operation and control, when the ore feeding flow (namely the flow Q in the main pipeline), the ore feeding concentration (C) and the ore feeding pressure (P) are changed, the PLC control system can automatically adjust the number of the opened cyclones and stabilize the feeding pressure of the cyclones within an allowable range; when 1 or several swirlers in the swirler group break down, the PLC system can make a response in time, increase the number of opened swirlers, and ensure the normal operation of production.
(3) The whole control process of the invention depends on the control function of the PLC, and other additional equipment and facilities are not needed to be added, thus the invention is easy to realize and has low cost.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the control system of the present invention.
Fig. 2 is a schematic top view of fig. 1.
Fig. 3 is a block diagram of a flow structure of a PLC control method of the present invention.
Detailed Description
The invention will be further described with reference to the following detailed description and drawings:
as shown in fig. 1 to 3, the automatic control system for feeding pressure of a cyclone provided by the invention comprises a PLC controller, and is characterized in that: the system comprises a flow meter, a concentration meter and a pressure meter which are arranged on a slurry conveying main pipeline, and an electric valve which is arranged on each slurry conveying branch pipe, wherein the flow meter, the concentration meter, the pressure meter and the electric valve are all connected with a PLC (programmable logic controller).
The control system comprises a pump pool 5, a delivery pump 6, a slurry delivery main pipeline 4, slurry delivery branch pipe groups and a cyclone set, wherein the slurry delivery main pipeline 4 is connected with the pump pool 5 and the slurry delivery branch pipe groups, the delivery pump 6 is arranged on the slurry delivery main pipeline 4 at the side of the pump pool 5, the cyclone set comprises 4-8 cyclones 7, each slurry delivery branch pipe 8 is correspondingly communicated with a feeding port of one cyclone 7, the control system further comprises a flow meter 1, a concentration meter 2, a pressure meter 3, an electric valve 9 and a PLC (programmable logic controller) 10, the flow meter 1, the concentration meter 2 and the pressure meter 3 are all arranged on the slurry delivery main pipeline 4, the electric valve 9 is arranged on each slurry delivery branch pipe 8, and the flow meter 1, the concentration meter 2, the pressure meter 3 and the electric valve 9 are all connected with the PLC 10;
the invention discloses a control method for adjusting feeding pressure of a swirler based on the number of opening and closing devices, which is characterized by comprising the following steps of:
step one, installing a flow meter, a concentration meter and a pressure meter on a slurry conveying main pipeline, arranging an electric valve on each slurry conveying branch pipe, and connecting the flow meter, the concentration meter, the pressure meter and the electric valve with a PLC (programmable logic controller);
step two, inputting a theoretical calculation formula
Inputting the following theoretical calculation formula into the PLC controller 10, specifically including:
in the formula (1) and the formula (2),
wherein:
p-calculated pressure at the ore feeding port of the swirler 7, in MPa;
k is the number of opened cyclones 7;
P1the pressure intensity at the section of a pressure gauge of the main slurry conveying pipeline 4, namely the indication number of the pressure gauge, MPa;
q-slurry flow in the main conduit 4 for slurry transport, i.e. the number of meter readings, m3/h；
C is slurry concentration, weight percentage concentration, namely concentration indicator,%;
rho-density of slurry, kg/m3；
g-acceleration of gravity, m/s2；
S1Section area m at pressure gauge of main slurry conveying pipeline 42；
S-swirler 7 feed hole cross section area, m2；
ρTrueTrue density of the material, kg/m3；
∑HfEnergy loss of a single cyclone 7, m;
step two, inputting P0、P10、Q0And C0K is calculated according to formula (4), formula (5), formula (6) and formula (2)0
P0Set value of pressure, Q, for the feed opening of the cyclone 70Setting flow rate, C, for slurry in main slurry conveying pipeline 40Setting the concentration, P, for the slurry10Is when P is equal to P0、Q＝Q0、C＝C0Pressure intensity and k at the section of a pressure gauge of a main slurry conveying pipeline 40Is when P is equal to P0、Q＝Q0、C＝C0、P1＝P10The number of cyclones 7 opened is P0、P10、Q0And C0Substituting the formula (4), the formula (5), the formula (6) and the formula (2) to calculate k0A value;
step four, calculating the pressure P at the ore feeding port of the cyclone 7 according to the formula (1)
The PLC 10 adopts the pressure P at the section of the pressure gauge of the main slurry conveying pipeline 41The slurry flow rate Q and the slurry concentration C are calculated, and k is equal to k0Substituting, and calculating the pressure P at the ore feeding port of the cyclone 7 according to the formula (1);
step five, comparing P and P0Deviation of (2)
If Δ P ═ P-P0If the | is less than or equal to the allowable error, returning to the fourth step;
if Δ P ═ P-P0If the | is greater than the allowable error, entering a sixth step;
step six, the PLC 10 substitutes the P value obtained by calculation in the step three into a formula (4), a formula (5), a formula (6) and a formula (2) to calculate a k value corresponding to the P value,
if k-k0＞0
The PLC controller 10 issues an instruction k-k0+1, opening an electric valve 9 of a cyclone 7, and then entering the sixth step;
if k-k0＜0
The PLC controller 10 issues an instruction k-k 01, closing the electric valve 9 of one cyclone 7, and then entering step seven;
step seven, making k equal to k0And returning to the step four.
Example (b):
the invention relates to a control method for adjusting the feeding pressure of a swirler based on the number of opened and closed swirlers, wherein a swirler group of a certain iron ore dressing plant consists of 8 swirlers with the specification of phi 660, and the control system of claim 1 is adopted, and the control method is characterized by comprising the following steps:
step one, fixed parameter values required by the calculation formula are input into the PLC 10 together with the calculation formula
The fixed parameters required for the calculation formula can be determined according to the equipment pipeline configuration selection and the ore properties as follows:
S1sectional area of 4 pressure gauge of main slurry conveying pipe, 0.1425m2；
S-swirler 7 ore-feeding mouth section area, 0.0137m2；
ρTrueTrue density of the material, 3100kg/m3；
∑HfSingle cyclone 7 energy loss, 0.10 m.
The detection parameters required by the calculation formula include: p1The pressure intensity at the section of a pressure gauge of the main slurry conveying pipeline 4, namely the indication number of the pressure gauge, MPa; q is the flow rate of the slurry in the main slurry conveying pipeline 4, i.e. the number of the meter, m3H; c is the concentration of the slurry, the weight percentage concentration, namely the concentration indicator,%.
The calculation parameters of the calculation formula include: p is a calculated pressure value at the ore feeding port of the swirler 7, and is MPa; k is the number of opened cyclones 7.
Step two, determining the number k of the initial cyclones0
The number k of the opened initial cyclones can be determined according to the ore amount processed by the on-site cyclone group and the optimal technological parameters0
Given P0Q is a set control value of the pressure of the ore feeding port of the cyclone 7 as 0.150Setting flow value C for slurry in the main slurry conveying pipeline 4 as 10000The concentration value, P, is set for the slurry at 58101.00 is defined as P ═ P0、Q＝Q0、C＝C0The pressure value at the section of a pressure gauge of a main slurry conveying pipeline 4 is P0、P10、Q0And C0The calculation result is obtained by substituting formula (4), formula (5), formula (6), and formula (2) where P is equal to P0、Q＝Q0、C＝C0、P1＝P10Number k of cyclone table opened0，k0Table 1:
TABLE 1 number of initial swirler openings k0
| Parameter(s) | P0(MPa) | P10(MPa) | Q0(m3·h-1) | C0(％) | k0(Table) |
| Optimum value | 0.15 | 1.00 | 1000 | 58 | 6 |
Step three, calculating the pressure P at the ore feeding port of the cyclone 7 according to the formula (1)
The PLC 10 adopts the pressure P at the section of the pressure gauge of the main slurry conveying pipeline 41The slurry flow rate Q and the slurry concentration C are calculated, and k is equal to k0Substituting, and calculating the pressure P at the ore feeding port of the cyclone 7 according to the formula (1);
step four, comparing P and P0Deviation of (2)
If Δ P ═ P-P0If the | is less than or equal to 0.02, returning to the third step;
if Δ P ═ P-P0If the absolute value is more than 0.02, entering a fifth step;
step five, the PLC 10 substitutes the P value obtained by the calculation in the step three into a formula (4), a formula (5), a formula (6) and a formula (2) to calculate a k value corresponding to the P value,
if k-k0＞0
The PLC controller 10 issues an instruction k-k0+1, opening an electric valve 9 of a cyclone 7, and then entering the sixth step;
if k-k0＜0
The PLC controller 10 issues an instruction k-k 01, closing the electric valve 9 of one cyclone 7, and then entering step six;
step six, making k equal to k0And returning to the step three.
The invention discloses a control method for adjusting the feeding pressure of a swirler based on the number of opening and closing devices, which has three states in the control process, one state is | P-P0| 0.02, the other is | P-P0| > 0.02, and three states of the specific control process and the associated detection and calculation data are shown in table 2:
TABLE 2 detailed control procedures and associated data
As can be seen from Table 2, in the case of State 1, k is set06 and other PLC controllers 101Substituting Q and C into equation (1) to obtain P as 0.15, | P-P0And |0.14-0.15| ═ 0.01MPa, which is smaller than the allowable error value of 0.02MPa, at this time, the PLC controller 10 sends an instruction and directly returns to the step three, and a control loop of next data acquisition, calculation determination and instruction sending is performed.
As can be seen from Table 2, in the case of State 2, k is set06 and other relevant parameters P taken by the PLC controller 101Substituting Q and C into equation (1) to determine that P is 0.18, since | P-P0Since |0.18 to 0.15| 0.03MPa is larger than the allowable error value of 0.02MPa, it is necessary to proceed to step five to obtain the k value at which P is 0.18 MPa. When P is 0.18MPa and is substituted into equation (2), k is 6.71, where k-k is0＝6.71-6＝0.71>0, so that the PLC controller 10 sends an instruction k to 6+1 to 7, and simultaneously sends an instruction to open one electric valve 9, and one more cyclone 7; then step six is carried out, and k is made to be 7 to k0And returning to the step three, and carrying out the control cycle of next data acquisition, calculation judgment and instruction sending.
As can be seen from Table 2, in the case of State 3, k is set06 and other relevant parameters P taken by the PLC controller 101Substituting Q and C into equation (1) to obtain P as 0.11, | P-P0Since |0.11 to 0.15| 0.04MPa is larger than the allowable error value of 0.02MPa, it is necessary to proceed to step five to obtain the k value at which P is 0.11 MPa. When P is 0.11MPa and is substituted into the formula (2), k is 5.13, where k-k is05.13-6 ═ -0.87 < 0, the PLC controller 10 therefore issues a command k ═ k0-1-6-1-5, with a command to an electric valve 9 to close, and a cyclone 7 to close; then entering step six, and making k equal to 5 equal to k0And returning to the step three, and carrying out the control cycle of next data acquisition, calculation judgment and instruction sending.
In the next control cycle, if it is the case of state 1, the new k0At 6, the PLC controller 10 continues to assume the relevant parameter P1And the Q and C detection values are calculated and judged, and an instruction is sent to control k, so that the opening and closing of each electric valve 9 in the cyclone group are controlled.
In the next control cycle, if it is the case of state 2, the new k0The PLC controller 10 continues to assume the relevant parameter P71And the Q and C detection values are calculated and judged, and an instruction is sent to control k, so that the opening and closing of each electric valve 9 in the cyclone group are controlled.
In the next control cycle, if it is the case of state 3, the new k0At 5, the PLC controller 10 continues to assume the relevant parameter P1And the detection values of Q and C are calculated and judged, and an instruction is sent to control k, so that the opening and closing of each electric valve 9 in the cyclone group are controlled.
By repeating the steps, the PLC controls the opening and closing of each electric valve 9 in the cyclone group so as to control the feeding pressure of the cyclone within an allowable range.
Claims (2)
1. The utility model provides a swirler ore feeding pressure automatic control system, includes the PLC controller, its characterized in that: the system comprises a flow meter, a concentration meter and a pressure meter which are arranged on a slurry conveying main pipeline, and an electric valve which is arranged on each slurry conveying branch pipe, wherein the flow meter, the concentration meter, the pressure meter and the electric valve are all connected with a PLC (programmable logic controller).
2. An automatic control method for feeding pressure of a cyclone is characterized by comprising the following steps:
step one, installing a flow meter, a concentration meter and a pressure meter on a slurry conveying main pipeline, arranging an electric valve on each slurry conveying branch pipe, and connecting the flow meter, the concentration meter, the pressure meter and the electric valve with a PLC (programmable logic controller);
step two, inputting a theoretical calculation formula
Inputting the following theoretical calculation formula into a PLC controller, specifically comprising:
in the formula (1) and the formula (2),
wherein:
p represents the calculated pressure at the feeding hole of the cyclone, and is MPa;
k is the number of opened cyclones;
P1the pressure intensity at the section of a pressure gauge of the slurry conveying main pipeline, namely the indication number of the pressure gauge, namely MPa;
q-slurry flow in main pipeline for slurry transport, i.e. number of meter indications, m3/h；
C is slurry concentration, weight percentage concentration, namely concentration indicator,%;
rho-density of slurry, kg/m3；
g-acceleration of gravity, m/s2；
S1Section area m at pressure gauge of main pipe for slurry transport2；
S-cyclone ore-feeding mouth section area, m2；
ρTrueTrue density of the material, kg/m3；
∑HfEnergy loss of a single cyclone, m;
step three, inputting P0、P10、Q0And C0K is calculated according to formula (4), formula (5), formula (6) and formula (2)0
P0For the pressure setting, Q, of the cyclone feed opening0Setting flow rate for slurry in main slurry conveying pipeline C0Setting the concentration, P, for the slurry10Is when P is equal to P0、Q＝Q0、C＝C0Pressure intensity and k at the section of a pressure gauge of a slurry conveying main pipeline0Is when P is equal to P0、Q＝Q0、C＝C0、P1＝P10The number of opened cyclones is P0、P10、Q0And C0Substituting the formula (4), the formula (5), the formula (6) and the formula (2) to calculate k0A value;
step four, calculating the pressure P at the ore feeding port of the cyclone according to the formula (1)
The PLC controller adopts the pressure P at the section of the pressure gauge of the slurry conveying main pipeline1The slurry flow rate Q and the slurry concentration C are calculated, and k is equal to k0Substituting, and calculating the pressure P at the ore feeding port of the cyclone according to a formula (1);
step five, comparing P and P0Deviation of (2)
If Δ&＝|&-&(If the | is less than or equal to the allowable error, returning to the fourth step;
if Δ P ═ P-P(If the | is greater than the allowable error, entering a sixth step;
step six, the PLC controller substitutes the P value obtained by calculation in the step three into a formula (4), a formula (5), a formula (6) and a formula (2) to calculate a k value corresponding to the P value,
if k-k0＞0
The PLC controller issues an instruction k ═ k0+1, opening an electric valve of a swirler, and then entering the sixth step;
if k-k0＜0
The PLC controller issues an instruction k ═ k01, closing an electric valve of a cyclone, and then entering a sixth step;
step seven, making k equal to k0And returning to the step four.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1503883A1 (en) * | 1984-08-31 | 1989-08-30 | Kopanitsa Dmitrij N | Automatic control device for hydraulic cyclone |
| CN102008998A (en) * | 2010-10-29 | 2011-04-13 | 东南大学 | Automatic control device and automatic control method of hydrocyclone |
| CN104549795A (en) * | 2015-01-09 | 2015-04-29 | 山西太钢不锈钢股份有限公司 | Feeding pressure control method for whirlcone |
| CN205084859U (en) * | 2015-10-21 | 2016-03-16 | 中冶北方（大连）工程技术有限公司 | Ball -milling - closed circuit control system of swirler group |
| CN106294988A (en) * | 2016-08-09 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of determine the hydrocyclone method to ore deposit pressure |
-
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1503883A1 (en) * | 1984-08-31 | 1989-08-30 | Kopanitsa Dmitrij N | Automatic control device for hydraulic cyclone |
| CN102008998A (en) * | 2010-10-29 | 2011-04-13 | 东南大学 | Automatic control device and automatic control method of hydrocyclone |
| CN104549795A (en) * | 2015-01-09 | 2015-04-29 | 山西太钢不锈钢股份有限公司 | Feeding pressure control method for whirlcone |
| CN205084859U (en) * | 2015-10-21 | 2016-03-16 | 中冶北方（大连）工程技术有限公司 | Ball -milling - closed circuit control system of swirler group |
| CN106294988A (en) * | 2016-08-09 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of determine the hydrocyclone method to ore deposit pressure |
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