CN107247470B - Automatic control system for repulping and washing in potash fertilizer production - Google Patents
Automatic control system for repulping and washing in potash fertilizer production Download PDFInfo
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- CN107247470B CN107247470B CN201710463895.6A CN201710463895A CN107247470B CN 107247470 B CN107247470 B CN 107247470B CN 201710463895 A CN201710463895 A CN 201710463895A CN 107247470 B CN107247470 B CN 107247470B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/003—Control of flow ratio using interconnected flow control elements
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/04—Fertilisers containing potassium from minerals or volcanic rocks
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
Abstract
The invention discloses an automatic control system for repulping and washing in potassium fertilizer production, which comprises the following components: the washing control system comprises a crude potassium ore feeding amount arithmetic instrument (3), a washing water flow setting arithmetic instrument (5), a washing water flow control instrument (7), a washing water adjusting valve actuator (9) and a washing water adjusting valve (10) which are sequentially connected; and the pulp mixing control system comprises a centrifuge filtrate flow given arithmetic unit (6), a centrifuge filtrate adjusting valve actuator (11), a centrifuge filtrate flow control instrument (13), a centrifuge filtrate adjusting valve (14) and a fine potassium ore pulp concentration display instrument (22).
Description
Technical Field
The invention belongs to the field of potash fertilizer production, and particularly relates to an automatic slurry mixing system for repulping and washing in potash fertilizer production.
Background
Automatic control means that a certain operating state or parameter of a machine, equipment or production process is automatically operated according to a predetermined rule by an external device or apparatus without direct human involvement. Automatic control is in contrast to manual control concepts.
The research of the automatic control technology is beneficial to freeing human from complex, dangerous and fussy working environment and greatly improving the control efficiency. Automatic control is a branch of engineering science. It involves automatic influence on the dynamic system using feedback principles to bring the output value close to what we want.
In the production process of the potash fertilizer, repulping and washing are processes for improving the grade of the potash fertilizer, water adding amount is a key control point for restricting the yield and quality of a potassium chloride product, and when fresh water is added to wash away sodium ions and magnesium ions in crude potassium, a centrifuge filtrate is added to adjust the repulping concentration. Repulping washing and size mixing require that the coarse potassium filter cake, fresh water and centrifuge filtrate are in a certain proportion relationship to carry out coarse potassium washing so as to improve the grade of products. At present, water is added manually by experience in a fresh water washing mode, and due to the requirement of size mixing concentration, when the added fresh water is too large, a large amount of potassium ions are lost, so that waste is caused. When the fresh water is added, the magnesium ions, the sodium ions and the impurities in the product cannot be washed cleanly, the grade of the product is influenced, and meanwhile, the addition of the filtrate of the centrifugal machine for size mixing is also added by manual experience, so that the size mixing concentration is unstable, the normal operation of the next procedure is influenced, and the continuous and stable production process is restricted.
Therefore, there is a need for an automatic slurry mixing system for repulping and washing in potassium fertilizer production, which can control the amount of fresh water and the amount of filtrate of a centrifuge in a reasonable proportion in real time according to the amount of crude potassium, so as to ensure long-term stable operation of production and improve the yield, quality and recovery rate of products.
Disclosure of Invention
Therefore, the invention provides an automatic control system for repulping and washing in potassium fertilizer production, which can solve the problems.
According to one aspect of the invention, an automatic control system for repulping and washing in potash fertilizer production is provided, which comprises: a washing control system comprises a crude potassium ore feeding amount arithmetic instrument 3, a washing water flow rate setting arithmetic instrument 5, a washing water flow rate control instrument 7, a washing water adjusting valve actuator 9 and a washing water adjusting valve 10, wherein the crude potassium ore feeding amount arithmetic instrument 3, the washing water flow rate setting arithmetic instrument 5 and the washing water flow rate control instrument 7 are sequentially connected, the washing water flow rate control instrument 7, the washing water adjusting valve actuator 9 and the washing water adjusting valve 10 are sequentially connected, and a pulp adjusting control system comprises a centrifuge filtrate flow rate setting arithmetic instrument 6, a centrifuge filtrate adjusting valve actuator 11, a centrifuge filtrate flow rate control instrument 13, a centrifuge filtrate adjusting valve 14 and a fine potassium slurry concentration display instrument 22, the centrifuge filtrate flow rate control instrument 13, the centrifuge filtrate adjusting valve actuator 11 and the centrifuge filtrate adjusting valve 14 are sequentially connected, the fine potassium slurry concentration display instrument 22 is connected with the centrifuge filtrate flow rate control instrument 13, the centrifuge filtrate flow given arithmetic unit 6 is connected with the centrifuge filtrate flow control instrument 13, the crude potassium ore feeding amount arithmetic unit 3 and the washing water flow control instrument 7 are connected with the centrifuge filtrate flow given arithmetic unit 6 so as to be connected with the washing control system and the size mixing control system, and the automatic control system carries out real-time monitoring on crude potassium ore feeding amount, washing water flow, concentrate potassium pulp concentration and centrifuge filtrate flow.
According to a preferred embodiment of the invention, the washing control system further comprises a belt filter 1, a filter frequency converter 2 and a crude potassium thickness gauge 4 are arranged on the belt filter 1, and the filter frequency converter 2 and the crude potassium thickness gauge 4 are connected with a crude potassium ore feeding amount calculator 3 to calculate the crude potassium ore feeding amount.
According to a preferred embodiment of the present invention, the washing control system further comprises a washing water flow meter 8, and the washing water flow meter 8 is connected with the washing water flow rate controller 7 and the washing water regulating valve 10.
According to a preferred embodiment of the present invention, the size mixing control system further comprises a centrifuge filtrate flow meter 12, the centrifuge filtrate flow meter 12 being connected to a centrifuge filtrate flow controller 13 and a centrifuge filtrate regulating valve 14.
According to a preferred embodiment of the present invention, the mixing control system further comprises a first stirring tank 16 and a second stirring tank 20, the first stirring tank 16 and the second stirring tank 20 are connected, and a first stirring paddle 15 and a second stirring paddle 17 are respectively arranged in the first stirring tank 16 and the second stirring tank 20.
According to a preferred embodiment of the present invention, a second agitation tank level gauge 18 and a second agitation tank level controller 19 are provided on the second agitation tank 20, which are connected in series, to prevent overflow of the slurry in the second agitation tank 20.
According to a preferred embodiment of the present invention, a potassium concentrate slurry transfer pump 23 is provided downstream of the second agitation tank 20.
According to a preferred embodiment of the present invention, a concentrate potassium ore slurry concentration meter 21 is provided downstream of the concentrate potassium ore slurry delivery pump 23, and the concentrate potassium ore slurry concentration meter 21 is connected to a concentrate potassium ore slurry concentration display 22 to feed back the actual concentrate potassium ore slurry concentration to the concentrate potassium ore slurry concentration display 22.
Through the technical scheme, the invention has the following beneficial effects:
(1) the automatic control system of the invention monitors the crude potassium ore feeding amount, the washing water flow, the concentration of the refined potassium ore pulp and the flow of the filter liquor of the centrifugal machine in real time, thereby not only realizing the optimized control of the process, but also greatly reducing the occurrence of various misoperation.
(2) The automatic control system calculates the water adding amount of the washing water according to the ore feeding amount of the crude potassium, the contents of sodium chloride and magnesium chloride in the crude potassium, the temperature of the washing water and the water content of a crude potassium filter cake, adjusts the water adding coefficient according to the grade of a refined potassium product, and calculates the filtrate adding amount of the centrifuge according to the ore feeding amount of the crude potassium, the actual water adding of the washing water and the concentration requirement of refined potassium slurry, so that the control of the water adding amount of the washing water and the concentration of the refined potassium ore is achieved, the process control level of repulping and washing in the production of the potash fertilizer is optimized, and the quality and the recovery rate.
(3) The automatic control system realizes control by utilizing a decoupling control principle, and has good compatibility and high anti-interference capability.
Drawings
FIG. 1 is an instrument flow chart of an automatic control system for repulping and washing in the production of potash fertilizer.
Fig. 2 is a control schematic diagram of the automatic control system of fig. 1.
In fig. 1, the reference numerals are: 1-belt filter, 2-filter frequency converter, 3-crude potassium ore feeding amount calculator, 4-crude potassium thickness meter, 5-washing water flow rate setting calculator, 6-centrifuge filtrate flow rate setting calculator, 7-washing water flow rate controller, 8-washing water flowmeter, 9-washing water regulating valve actuator, 10-washing water regulating valve, 11-centrifuge filtrate regulating valve actuator, 12-centrifuge filtrate flowmeter, 13-centrifuge filtrate flow rate controller, 14-centrifuge filtrate regulating valve, 15-first stirring paddle, 16-first stirring tank, 17-second stirring paddle, 18-second stirring tank liquid level meter, 19-second stirring tank liquid level controller, 20-second stirring tank, 21-fine potassium slurry meter, 22-refined potassium ore slurry concentration display instrument and 23-refined potassium ore slurry delivery pump.
Detailed Description
The present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific examples described in the following embodiments of the present invention are merely illustrative of specific embodiments of the present invention and do not limit the scope of the invention.
FIG. 1 is an instrument flow chart of an automatic control system for repulping and washing in the production of potash fertilizer. In fig. 1, the thin solid line is marked with a dashed line to indicate a control signal line, and as shown in fig. 1, the invention provides an automatic control system for repulping and washing in potassium fertilizer production, wherein the automatic control system comprises: the washing control system comprises a belt filter 1, a filter frequency converter 2, a crude potassium ore feeding amount arithmetic instrument 3, a crude potassium thickness gauge 4, a washing water flow setting arithmetic instrument 5, a washing water flow controller 7, a washing water flow meter 8, a washing water regulating valve actuator 9 and a washing water regulating valve 10, wherein the filter frequency converter 2 and the crude potassium thickness gauge 4 are connected with the belt filter 1, and the washing water flow meter 8 and the washing water regulating valve actuator 9 are connected with the washing water regulating valve 10; and a pulp mixing control system, which comprises a centrifuge filtrate flow rate setting arithmetic device 6, a centrifuge filtrate flow rate controller 11, a centrifuge filtrate flow meter 12, a centrifuge filtrate regulating valve controller 13, a centrifuge filtrate regulating valve 14, a first stirring paddle 15, a first stirring tank 16, a second stirring paddle 17, a second stirring tank level meter 18, a second stirring tank level controller 19, a second stirring tank 20, a potassium concentrate concentration meter 21, a potassium concentrate concentration display 22 and a potassium concentrate delivery pump 23, a centrifuge filtrate regulating valve actuator 11 and a centrifuge filtrate flow meter 12 are connected with the centrifuge filtrate regulating valve 14, the first stirring tank 16 and the second stirring tank 20 are sequentially connected, the first stirring paddle 15 is arranged in the first stirring tank 16, the second stirring paddle 17 is arranged in the second stirring tank 20, the centrifuge filtrate flow rate setting arithmetic device 6 is connected with the centrifuge filtrate flow rate controller 13, the automatic control system monitors the crude potassium ore feeding amount, the washing water flow, the concentration of the refined potassium ore pulp and the flow of the filter liquor of the centrifugal machine in real time, not only realizes the optimal control of the technological process, but also greatly reduces the occurrence of various misoperation.
In the washing control system, a crude potassium thickness gauge 4 and a filter frequency converter 2 are respectively connected with a crude potassium ore feeding amount calculator 3 to calculate the crude potassium ore feeding amount, specifically, the crude potassium ore feeding amount, that is, the volume flow rate of crude potassium, which is the thickness of crude potassium x the width of a belt filter x the speed of the filter.
In the washing control system, the washing water flow rate controller 7 is connected with a washing water adjusting valve actuator 9 to adjust the washing water flow rate through a washing water adjusting valve 10.
In the washing control system, a crude potassium ore feeding amount arithmetic unit 3, a washing water flow rate setting arithmetic unit 5 and a washing water flow rate control unit 7 are connected in sequence to calculate and control the washing water flow rate, specifically, according to sodium chloride (NaCl) and magnesium chloride (MgCl) in crude potassium2) The content, the temperature of washing water and the moisture content of the crude potassium filter cake are used for carrying out automatic control water adding washing of system strategy proportioning, crude potassium component data obtained by assay are input into a computer, the computer carries out real-time calculation (formula 1) according to a set program, and theoretical water adding amount is obtained:
in the formula, WcTheoretical amount of water added, QcCrude Potassium ore quantity, t temperature, NcMine moisture, M-composition in mine, 0.296-dissolution coefficient, 0.0006-temperature coefficient.
In the washing control system, a crude potassium ore feeding amount arithmetic instrument 3 and a washing water flow control instrument 7 are connected to a centrifuge filtrate flow setting arithmetic instrument 6 so as to connect the washing control system and a size mixing control system and calculate the centrifuge filtrate flow addition amount.
In the slurry mixing control system, a fine potassium ore slurry concentration display instrument 22 is connected with a centrifuge filter fluid flow control instrument 13 so as to adjust the centrifuge filter fluid flow according to the actual fine potassium ore slurry concentration and the fine potassium ore slurry requirement; a second agitation tank 20, a second agitation tank liquid level meter 18 and a second agitation tank liquid level controller 19 to prevent the overflow of the slurry in the second agitation tank 20; the centrifuge filtrate regulating valve actuator 11 is connected to a centrifuge filtrate flow controller 13 to regulate the centrifuge filtrate flow through a centrifuge filtrate regulating valve 14.
The first stirring tank 16 and the second stirring tank 20 are connected for secondary stirring, and a first stirring paddle 15 and a second stirring paddle 17 are respectively arranged in the first stirring tank 16 and the second stirring tank 20 to sufficiently stir the slurry.
Fig. 2 is a control schematic diagram of the automatic control system of fig. 1.
As shown in FIG. 2, in the washing control system, the amount of crude potassium ore on the belt filter is measured by using the frequency converter 2 of the filter and the crude potassium thickness gauge 4 as measuring elements, and the amount is determined according to the sodium chloride (NaCl) and magnesium chloride (MgCl) in the crude potassium2) The content, the temperature of washing water and the water content of the crude potassium filter cake are used for carrying out system strategy proportioning automatic control water adding washing, crude potassium component data obtained by assay are input into a computer, and the computer carries out real-time calculation (formula 1) according to a set program to obtain theoretical water adding amount; and comparing the measured feedback values of the theoretical water adding amount and the actual water adding amount in a ratio device in real time, correcting the parameters of the washing water flow controller 7 in real time, and outputting a control signal (4-20mA) to the washing water electric regulating valve by the washing water flow controller 7 so as to control the opening degree of the valve to control the water adding amount in real time. The water adding ratio parameters of the theoretical water adding amount and the actual water adding amount can be set through the automatic control system, and monitoring and modification are carried out through the automatic control system. The automatic control system of the invention keeps the actual water adding amount Fs as equal as possible to the theoretical water adding amount Wc when the temperature coefficient and the dissolution coefficient are unchanged according to the measured feedback values of the theoretical water adding amount and the actual water adding amount given by the washing water given calculator. When the ore feeding amount and the components of the crude potassium are changed, the theoretical water adding amount is also changed,the relation of the ratio of the theoretical water addition Wc to the actual water addition Fs is always maintained. The ratio can be adjusted according to the parameters on the refined potassium laboratory sheet, and the ratio relation is relatively accurate, so that the automatic tracking of the water adding amount is realized. The automatic control system calculates the water adding amount of the washing water according to the ore adding amount of the crude potassium, the contents of sodium chloride and magnesium chloride in the crude potassium, the temperature of the washing water and the water content of a crude potassium filter cake, adjusts the water adding coefficient according to the grade of a refined potassium product, and calculates the filtrate adding amount of the centrifuge according to the ore adding amount of the crude potassium, the actual water adding of the washing water and the concentration requirement of the refined potassium slurry, so that the process control level of repulping and washing in the production of the potash fertilizer is optimized by controlling the water adding amount of the washing water and the concentration of the refined potassium slurry, and the quality and the recovery rate of potassium.
In a pulp mixing control system, after washing and automatic water addition are finished, sodium ions and magnesium ions in the crude potassium slurry are ensured to be washed away, and simultaneously, a certain proportion of centrifuge filtrate is added for pulp mixing so as to ensure the concentration of repulping. Setting a given value of the concentration of the concentrate potassium ore pulp, comparing a measurement feedback value of a concentrate potassium ore pulp concentration meter 21 with the given value of the concentration of the concentrate potassium ore pulp, outputting a control signal output by a washing water flow controller 7, adjusting a specific value parameter in a comparator, enabling the ore feeding amount of crude potassium to enter a centrifuge filter liquor flow given arithmetic unit 6 to calculate the flow of a pulp mixing mother liquor, and enabling the washing water flow and the centrifuge filter liquor flow to react on an output signal of the centrifuge filter liquor flow given arithmetic unit 6 to ensure that the pulp mixing concentration of the concentrate potassium ore pulp is consistent with the given value of the concentration of the concentrate potassium ore pulp. The method aims to keep the filtrate volume of the size mixing centrifuge to follow the crude potassium ore feeding volume and the washing water flow volume as much as possible, and always keep the sum of the washing water flow volume and the centrifuge filtrate flow volume to be proportional to the washed fine potassium ore volume, so that the stability of size mixing concentration is ensured, and the size mixing balance of the centrifuge filtrate is realized.
The automatic control system realizes control by utilizing a decoupling control principle, and has good compatibility and high anti-interference capability.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (8)
1. An automatic control system for repulping and washing in potash fertilizer production, wherein the automatic control system comprises:
a washing control system, the washing control system comprises a crude potassium ore feeding amount arithmetic instrument (3), a washing water flow given arithmetic instrument (5), a washing water flow controller (7), a washing water adjusting valve actuator (9) and a washing water adjusting valve (10), the crude potassium ore feeding amount arithmetic instrument (3), the washing water flow given arithmetic instrument (5) and the washing water flow controller (7) are sequentially connected, the washing water flow controller (7), the washing water adjusting valve actuator (9) and the washing water adjusting valve (10) are sequentially connected, and
the slurry mixing control system comprises a centrifuge filtrate flow given arithmetic unit (6), a centrifuge filtrate adjusting valve actuator (11), a centrifuge filtrate flow control instrument (13), a centrifuge filtrate adjusting valve (14) and a potassium concentrate concentration display instrument (22), wherein the centrifuge filtrate flow control instrument (13), the centrifuge filtrate adjusting valve actuator (11) and the centrifuge filtrate adjusting valve (14) are sequentially connected, the potassium concentrate concentration display instrument (22) is connected with the centrifuge filtrate flow control instrument (13), the centrifuge filtrate flow given arithmetic unit (6) is connected with the centrifuge filtrate flow control instrument (13),
the crude potassium ore feeding quantity arithmetic instrument (3) and the washing water flow control instrument (7) are connected to the centrifuge filtrate flow given arithmetic instrument (6) so as to connect the washing control system and the size mixing control system,
the automatic control system monitors the ore feeding amount of crude potassium, the flow rate of washing water, the concentration of fine potassium ore pulp and the flow rate of filter liquor of the centrifugal machine in real time.
2. The automatic control system according to claim 1, wherein the washing control system further comprises a belt filter (1), a filter frequency converter (2) and a crude potassium thickness meter (4) are arranged on the belt filter (1), and the filter frequency converter (2) and the crude potassium thickness meter (4) are connected with the crude potassium ore feeding amount calculator (3) to calculate the crude potassium ore feeding amount.
3. The automatic control system according to claim 1, wherein the washing control system further comprises a washing water flow meter (8), the washing water flow meter (8) being connected with the washing water flow controller (7) and the washing water regulating valve (10).
4. The automatic control system of claim 1, wherein the sizing control system further comprises a centrifuge filtrate flow meter (12), the centrifuge filtrate flow meter (12) being connected with the centrifuge filtrate flow controller (13) and the centrifuge filtrate regulating valve (14).
5. The automatic control system according to claim 1, wherein the mixing control system further comprises a first mixing tank (16) and a second mixing tank (20), the first mixing tank (16) and the second mixing tank (20) being connected and a first mixing paddle (15) and a second mixing paddle (17) being provided in the first mixing tank (16) and the second mixing tank (20), respectively.
6. The automatic control system according to claim 5, wherein a second agitation tank level gauge (18) and a second agitation tank level controller (19) are provided on the second agitation tank (20) in series to prevent overflow of the slurry in the second agitation tank (20).
7. The automatic control system according to claim 5, wherein a fine potassium slurry delivery pump (23) is provided downstream of the second agitation tank (20).
8. The automatic control system according to claim 7, wherein a concentrate potassium slurry concentration meter (21) is provided downstream of the concentrate potassium slurry delivery pump (23), the concentrate potassium slurry concentration meter (21) being connected to the concentrate potassium slurry concentration display (22) to feed back the actual concentrate potassium slurry concentration to the concentrate potassium slurry concentration display (22).
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| CN108052129B (en) * | 2017-12-08 | 2021-08-20 | 横琴七弦琴知识产权服务有限公司 | Control method of crude potassium repulping washing device |
| CN108752058A (en) * | 2018-07-16 | 2018-11-06 | 青海盐湖工业股份有限公司 | A kind of method and apparatus for producing potash fertilizer using carnallite based on on-line checking |
| CN115771904A (en) * | 2022-06-24 | 2023-03-10 | 青海盐湖工业股份有限公司 | Crude potassium repulping washing method |
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