CN107827373B - PLC (programmable logic controller) controlled full-automatic nano calcium carbonate digestion production line - Google Patents
PLC (programmable logic controller) controlled full-automatic nano calcium carbonate digestion production line Download PDFInfo
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- CN107827373B CN107827373B CN201710985206.8A CN201710985206A CN107827373B CN 107827373 B CN107827373 B CN 107827373B CN 201710985206 A CN201710985206 A CN 201710985206A CN 107827373 B CN107827373 B CN 107827373B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/08—Devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a nano calcium carbonate digestion production line, which comprises a full-automatic PLC control system and field production equipment; the production equipment mainly comprises a groove type digestion machine, a digestion water tank, a first heat exchanger, a first circular vibrating screen, a coarse slurry tank, a waste water tank, a secondary coarse slurry tank, a hydrocyclone, a second circular vibrating screen, a recovery water tank, a fine slurry tank and a second heat exchanger, wherein the full-automatic PLC control system comprises an upper computer, a distributed I/O slave station, a control box arranged on site, a touch screen and a fault alarm; and the online concentration detector, the temperature sensor, the dust sensor, the liquid level sensor and the pressure sensor of the production equipment are all connected and communicated with the PLC control system. The invention adopts a 485-modbus control system in PLC communication, the operation and control are easy, the whole set of digestion system can completely realize the full-automatic mechanical production of the nano calcium carbonate, the field unmanned operation is realized, and the mechanical and intelligent production is completely realized from digestion, dust removal, slag removal and slurry refining.
Description
Technical Field
The invention relates to calcium carbonate production equipment, in particular to a PLC (programmable logic controller) controlled full-automatic nano calcium carbonate digestion production line.
Background
Calcium carbonate is an important inorganic chemical product and is one of the most widely used inorganic fillers at present. The nanometer calcium carbonate is suitable for different fields due to different particle sizes, and has wide application in the industries of rubber, plastics, papermaking, paint, printing ink and the like. The existing nano calcium carbonate production line has lower automation degree, unreasonable production equipment preparation and incapability of coordinating and unifying front and back control in the production process, thereby influencing the consistency of the produced nano calcium carbonate particles.
Disclosure of Invention
The invention aims to provide an automatic nano calcium carbonate production line, and the invention aims to provide a nano calcium carbonate production process based on the production line,
the purpose of the invention is realized as follows:
a PLC controlled full-automatic nanometer calcium carbonate digestion production line comprises a full-automatic PLC control system and field production equipment;
production facility shakes including slot type digesting machine, digestion water pitcher, first heat exchanger, first circle and sieves, thick liquid jar, waste water jar, second grade thick liquid jar, hydrocyclone separator, second circle and sieves, retrieves water pitcher, thin thick liquid jar, smart thick liquid jar and second heat exchanger, wherein:
A. a trough type digestion machine: the feed end of the groove type slaker is connected with a quicklime feeding device and a slaking water pipe, and the discharge end of the groove type slaker is connected with a first circular vibrating screen; a moisture discharge pipeline is arranged above the groove type digestion machine, a water film sprayer is arranged at the upper end of the moisture discharge pipeline and is connected with an emptying pipeline, and a temperature sensor and a dust sensor are respectively arranged on the moisture discharge pipeline; the waste water discharge end of the trough type digester is connected with a waste water tank through a pipeline;
B. digestion water tank: the water inlet end of the digestion water tank is connected with a water supply pipeline of the second heat exchanger, the water outlet end of the digestion water tank is connected with a digestion water pump, a temperature sensor and a liquid level sensor are arranged on the digestion water tank, and the liquid level sensor is connected and communicated with the digestion water pump;
the digestion water pump sends the digestion water in the tank into the tank-type digestion machine and the water film sprayer through a digestion water pipeline, the heat exchange is carried out between the midstream of the digestion water pipeline and the steam in the steam pipeline at the first heat exchanger, the upstream of the digestion water pipeline is provided with a pressure sensor, a flow sensor and a flow valve which are connected and communicated, and the downstream of the digestion water pipeline is provided with a temperature sensor and is connected and communicated with the flow valve arranged on the steam pipeline;
C. a first circular vibrating screen: the feeding end of the first circular vibrating screen is connected with the discharging end of the trough type digestion machine, and a temperature sensor is arranged on a connecting pipeline; the discharge end of the first circular vibrating screen is connected with a coarse slurry tank; the waste water discharge end of the first circular vibrating screen is connected with a waste water tank through a pipeline;
an online concentration detector and a temperature sensor are arranged on a connecting pipeline between the groove type digester and the first circular vibrating screen;
D. a coarse slurry tank: the feeding end of the coarse slurry tank is connected with the discharging end of the first circular vibrating screen, and the discharging end of the coarse slurry tank is connected with the secondary coarse slurry tank through a coarse slurry pump; a coarse slurry stirrer is arranged in the coarse slurry tank, and a liquid level sensor connected and communicated with a coarse slurry pump is arranged on the coarse slurry tank; a pressure sensor and a flow valve are arranged on a connecting pipeline of the coarse slurry pump and the secondary coarse slurry tank;
E. a waste water tank: wastewater discharged by the trough type digester and wastewater discharged by the first circular vibrating screen flow into a wastewater tank through a wastewater pipeline;
F. a secondary coarse slurry tank: the feed end of the second-stage coarse slurry tank is connected with a coarse slurry pump, and the discharge end of the second-stage coarse slurry tank is connected with a hydrocyclone separator through a second-stage coarse slurry pump; a second-stage coarse pulp stirrer is arranged in the second-stage coarse pulp tank, and a temperature sensor and a liquid level sensor which is connected and communicated with the second-stage coarse pulp pump are arranged on the second-stage coarse pulp tank; a pressure sensor and a flow valve are arranged on a connecting pipeline of the secondary coarse slurry pump and the hydrocyclone separator;
G. a hydrocyclone: the feed end of the hydrocyclone separator is connected with a second-stage coarse slurry pump, and the discharge end of the hydrocyclone separator and the first branch of the water supply pipeline are connected with the feed end of the second circular vibrating screen; the discharge end of the water to be recovered of the hydrocyclone separator is connected with a recovery water tank;
H. a second circular vibrating screen: the discharge end of the second circular vibrating screen is connected with the fine pulp tank; the discharge end of the water to be recovered of the second circular vibrating screen is connected with a recovery water tank;
I. a water recovery tank: pumping the water to be recovered in the recovery water tank to a filter pressing working section through a recovery water pump for post-treatment; a liquid level sensor connected and communicated with the recovery water pump is arranged on the recovery water tank;
J. fine slurry tank: the discharge end of the fine pulp tank is connected with the feed end of the fine pulp tank through a fine pulp pump, and the fine pulp tank is provided with a temperature sensor and a liquid level sensor which is connected and communicated with the fine pulp pump; a pressure sensor and a flow valve are arranged on a connecting pipeline of the fine pulp pump and the fine pulp tank;
K. a refined pulp tank: the discharge end of the fine pulp tank is conveyed to a size mixing working section through a fine pulp pump for post-treatment; a fine pulp stirrer is arranged in the fine pulp tank, and a temperature sensor and a liquid level sensor which is connected and communicated with the fine pulp pump are arranged on the fine pulp tank; a pressure sensor and a flow valve are arranged on a connecting pipeline from the fine pulp pump to the pulp mixing working section, and the connecting pipeline enters the pulp mixing working section after heat exchange with a second branch of a water supply pipeline of a second heat exchanger;
the full-automatic PLC control system includes:
l, an upper computer,
m, a distributed I/O slave station, wherein the slave station is provided with a wireless transmitter and an omnidirectional antenna; and the number of the first and second groups,
n, a control box, a touch screen and a fault alarm which are arranged on site;
and the online concentration detector, the temperature sensor, the dust sensor, the liquid level sensor and the pressure sensor of the production equipment are all connected and communicated with the PLC control system.
The PLC controls the full-automatic nano calcium carbonate digestion production line, the coarse pulp tank is a double-tank body and consists of a first tank body and a second tank body, and a communicating pipeline is arranged between the first tank body and the second tank body; the feed end of the first tank body is connected with the discharge end of the first circular vibrating screen, the discharge end of the first tank body and the discharge end of the second tank body are connected with a coarse pulp pump, and a liquid level sensor on the coarse pulp tank is arranged on the second tank body.
The invention relates to a nano calcium carbonate production digestion process control system, which adopts a PLC central control system to carry out corresponding configuration management program, namely 485-modbus communication for short, carries out automatic control on field production equipment of a nano calcium carbonate production line and uses a Wivcc picture monitoring computer to monitor, and mainly realizes the functions of controlling picture dynamic display and editing and the like of automatic/manual start-stop, monitoring process flow chart and process parameter index, control regulation, trend display, alarm monitoring, log query, system equipment monitoring, online parameter modification and the like of the nano calcium carbonate production line equipment. The invention is easy to operate and control, the whole set of digestion system can completely realize the full-automatic mechanical production of the nano calcium carbonate, the temperature and dust sensors are arranged on the moisture discharge pipeline of the digestion machine equipment, the collected data are transmitted to the PLC control system for control and regulation, and the collected data are well processed by the air inducing device and the wet dust removal heat exchanger. The environment is ensured to be clean, no dust flies, meanwhile, the water and the steam realize heat exchange and are supplemented into a digestion machine, no dust is discharged to the outside, the civilized clean environment-friendly production is realized, and the production process is energy-saving, efficient and environment-friendly.
The process method of the invention realizes the field unmanned operation in the whole set of digestion process, and completely realizes the mechanized and intelligent production from digestion, dust removal, slag removal and slurry refining. The proportion of ash to water is set by the PLC control system, materials and water are accurately conveyed to the storage bin, the digestion, decomposition and exothermic reaction of the quick lime, the proportion of the stable ash to the water, the temperature of the calcium hydroxide slurry prepared by the digestion, decomposition and exothermic reaction of the quick lime, the specific gravity of the calcium hydroxide slurry and the concentration of the calcium hydroxide slurry are stable, safe, reliable, economical and practical. In the process of refining the calcium hydroxide slurry, the pressure sensor and the metering flow sensor monitor and transmit the pressure sensor and the metering flow sensor to the PLC control system in real time, the hydrocyclone and the circular vibrating screen run stably through the coordination control of the PLC control system, and the refined calcium hydroxide slurry has good quality.
Carry out real-time detection's pressure sensor to thick liquids stress, be used for carrying out real-time detection's optic fibre temperature sensor to thick liquids temperature, be used for the water supply temperature sensor who detects water, carry out synchronous detection, demonstration and storage to test data, compare with prior art, can more in time monitor the data and synchronous display in the test process come out, can know the state that thick liquids were located the very first time, be favorable to better control production process, improved the accuracy nature of thick liquids production greatly. The blanking continuity and uniformity are good, and the test precision is high. The data can be stably and reliably acquired and transmitted. The storage display displays data visually, test operators can check the data conveniently, test bases are provided for engineering technicians to research the micro processes of the flowing characteristic, the layering characteristic, the deposition rule and the like of the slurry in the flowing process, and the engineering technicians are further facilitated to research the slurry filling forming mechanism and the uneven characteristic of the slurry filling mechanism.
The field bus technology is accurately controlled in real time by precise quantity control devices such as temperature sensors, dust sensors, water film spraying detection and the like, and a plurality of redundant structures are adopted, so that the system is stable and reliable, and the operation and maintenance are simple and convenient. Meanwhile, the labor wage cost is reduced, the operation environment is good, and the environment-friendly and clean production is completely realized. The prepared calcium hydroxide slurry has good quality, fine slurry, large specific surface area, high slurry yield and fine and white slurry quality.
Drawings
FIG. 1 is a schematic diagram of the structure of the on-site production equipment of the production line of the invention.
In fig. 1: 1. a storage bin, 2, an electromagnetic vibration feeder, 3, a metering weighing belt conveyor, 4, a trough type digestion machine, 5, a water film sprayer, 6, a moisture discharge pipeline, 7, an emptying pipeline, 8, a digestion water pipeline, 9, a first heat exchanger, 10, a steam pipeline, 11, a digestion water pump, 12, a digestion water tank, 13, a water supply pipeline second branch, 14, a water supply pipeline first branch, 15, a first circular vibration sieve, 16, a first tank body, 17, a second tank body, 18, a coarse pulp stirrer, 19, a coarse pulp pump, 20, a second coarse pulp tank, 21, a second coarse pulp stirrer, 22, a second coarse pulp pump, 23, a hydrocyclone separator, 24, a second circular vibration sieve, 25, a fine pulp tank, 26, a fine pulp pump, 27, a fine pulp tank, 28, a fine pulp stirrer, 29, a fine pulp pump, 30, a fine pulp pipeline, 31, a second heat exchanger, 32, a recovery tank, 33, a recovery water pump, 34, A liquid level sensor 35, a temperature sensor 36, a pressure sensor 37, a flow sensor 38, an online concentration detector 39 and a waste water tank.
FIG. 2 is the statistics of the particle size distribution of the nano calcium carbonate particles produced by the production line and the production process of the present invention.
Detailed Description
Example 1
The nano calcium carbonate production line comprises a full-automatic PLC control system and field production equipment.
The structure of the on-site production equipment is shown in figure 1, and mainly comprises a groove type slaker 4, a quicklime feeding device, a slaking water tank 12, a first heat exchanger 9, a first circular vibrating screen 15, a coarse pulp tank, a wastewater tank 39, a secondary coarse pulp tank 20, a hydrocyclone 23, a second circular vibrating screen 24, a recovery water tank 32, a fine pulp tank 25, a fine pulp tank 27 and a second heat exchanger 31.
The trough type digester 4 is a three-trough digester, the feed end of the first trough of the three-trough digester is respectively connected with a raw lime feeding device and a slaking water pipe, the discharge end of the third trough is connected with a first circular vibrating screen 15, and the waste water discharge end of the three-trough digester is connected to a waste water tank 39 through a connecting pipeline. Temperature sensors 35 are arranged on three tanks of the three-tank digestion machine, and a temperature sensor 35 and an online concentration detector 38 are arranged on a connecting pipeline between the discharge end of the third tank and the first circular vibrating screen 15.
The quick lime feeding device comprises a stock bin 1, an electromagnetic vibration feeder 2 and a measuring and weighing belt conveyor 3, and the quick lime in the stock bin 1 falls onto the measuring and weighing belt conveyor 3 through the electromagnetic vibration feeder 2 and is conveyed into the three-groove slaker.
The first source of the digestion water in the digestion water tank 12 is condensed water of other working sections, the second source is production water, the production water passes through the second branch 13 of the water supply pipeline, firstly passes through the second heat exchanger 31, and carries out primary heat exchange with the fine pulp pipeline 30 of the second heat exchanger 31, and after the heat of the fine pulp in part of the fine pulp pipeline 30 is recovered, the water flows into the digestion water tank 12 to be used as the digestion water. The digestion water in the digestion water tank 12 enters the digestion water pipeline 8 through the digestion water pump 11. The middle section (i.e., the midstream section) of the digestion water line 8 is heat-exchanged with the steam line 10 at the first heat exchanger 9, and the digestion water rises and is then sent to the three-tank digester. A flow sensor 37 and a flow valve which are communicated with each other are arranged at the upstream of the digestion water pipeline 8; a temperature sensor 35 is installed downstream of the digestion water pipe 8 and a flow valve communicating with the temperature sensor 35 is installed on the steam pipe 10.
The PLC control system carries out PID operation at any time according to feedback data and adjusts quicklime feeding amount, slaking water flow and steam flow of the quicklime feeding device in time according to feedback data of the temperature sensor 35 and the online concentration detector 38 on the three-groove slaker, on a connecting pipeline between the three-groove slaker and the first circular vibrating screen 15, feedback data of the upstream flow sensor 37 of the slaking water pipeline 8, feedback data of the metering weighing belt conveyor 3 and feedback data of the downstream temperature sensor 35 of the slaking water pipeline 8. The decomposition exothermic reaction of calcium oxide of calcium lime and water is ensured to be always in a boiling state (the temperature exceeds 100 ℃) through the adjustment of a PLC control system, and the temperature of the calcium hydroxide slurry is kept unchanged at 108 ℃. The decomposition exothermic reaction speed is very fast, the calcium hydroxide slurry digested from the first tank enters the second tank and the third tank, so that fine calcium oxide particles in the calcium hydroxide slurry are fully mixed and reacted, the temperature of the calcium hydroxide slurry is reduced to 80 ℃ when the calcium hydroxide slurry reaches the third tank, the decomposition exothermic reaction of the calcium oxide and the water is basically finished, and the temperature of the calcium hydroxide slurry is kept unchanged at 80 ℃.
The upper port of the three-groove slaker is connected with a moisture discharge pipeline 6, and when a large amount of hot steam and a small amount of dust generated in the process of decomposing and releasing heat of quicklime and water are discharged from the moisture discharge pipeline 6, the dust is removed through a water film sprayer 5 arranged on the moisture discharge pipeline 6 and then discharged through an emptying pipeline 7 arranged on the water film sprayer 5. Be provided with temperature sensor and dust sensor (not shown in figure 1) on evacuation pipeline 7, according to temperature and dust sensor detection data on evacuation pipeline 7, PLC control system sends the adjustment instruction at any time to make evacuation pipeline 7 discharge up to standard more accurately.
The discharge end of the third tank of the three-tank digestion machine is connected with the feed end of the first circular vibrating screen 15, the discharge end of the first circular vibrating screen 15 is connected with the coarse pulp tank, and the waste water discharge end of the first circular vibrating screen 15 is connected to the waste water tank 39 through a connecting pipeline. When the coarse slurry generated by the three-tank digesting machine enters the first circular vibrating screen 15, the PLC control system sends an instruction to start the first circular vibrating screen 15 (80 meshes), and the coarse slurry of the calcium hydroxide enters the coarse slurry tank after being screened.
The coarse pulp tank is a double-tank body and is composed of a first tank body 16 and a second tank body 17, coarse pulp stirrers 18 are arranged in the first tank body 16 and the second tank body 17, the feeding end of the first tank body 16 is connected with the discharging end of a first circular vibrating screen 15, the discharging ends are arranged at the bottoms of the first tank body 16 and the second tank body 17 and are connected with an inlet of a coarse pulp pump 19 together, meanwhile, the side walls of the first tank body 16 and the second tank body 17 are communicated, and a liquid level sensor 34 communicated with the coarse pulp pump 19 is arranged on the second tank body 17. When the slurry liquid level in the second tank 17 reaches a certain liquid level height, the PLC control system sends an instruction to start the coarse slurry agitator 18.
The discharge end of the coarse pulp tank is connected with the feed end of a second-stage coarse pulp tank 20 through a coarse pulp pump 19, and the discharge end of the second-stage coarse pulp tank 20 is connected with the inlet of a second-stage coarse pulp pump 22. A second-stage coarse pulp stirrer 21 is arranged in the second-stage coarse pulp tank 20, and a temperature sensor 35 and a liquid level sensor 34 communicated with the second-stage coarse pulp pump 22 are arranged on the tank body of the second-stage coarse pulp tank 20.
The discharge end of the second-stage coarse pulp tank 20 is connected with the feed end of a hydrocyclone 23 through a second-stage coarse pulp pump 22, the discharge end of the hydrocyclone 23 and the first branch 14 of the water supply pipeline are jointly connected with the feed end of a second circular vibrating screen 24, and the discharge end of the second circular vibrating screen 24 is connected with the feed end of a fine pulp tank 25. The discharge end of the water to be recovered of the hydrocyclone 23 and the discharge end of the water to be recovered of the second circular vibrating screen 24 are both connected to a recovery water tank 32, and the recovery water tank 32 sends the recovered water to a filter pressing working section through a recovery water pump 33 for post-treatment.
The discharge end of the fine pulp tank 25 is connected with the feed end of the fine pulp tank 27 through a fine pulp pump 26; a temperature sensor 35 and a level sensor 34 in communication with the fine slurry pump 26 are provided on the fine slurry tank 25. The discharge end of the fine pulp tank 27 is connected with a fine pulp pipeline 30 through a fine pulp pump 29; a fine pulp stirrer 28 is provided in the fine pulp tank 27, and a temperature sensor 35 and a level sensor 34 communicating with the fine pulp pump 29 are attached to the fine pulp tank 27.
The fine pulp pipeline 30 is connected to the pulp mixing section after heat exchange with the water supply pipeline second branch 13 through a second heat exchanger 31.
Further, pressure sensors 36 and flow valves communicating with the pressure sensors 36 on the respective lines are installed on the connection lines between the slurry pump 19 and the second-stage slurry tank 21, between the second-stage slurry pump 22 and the hydrocyclone 23, and between the slurry pump 26 and the fine slurry tank 27, and on the fine slurry line 30.
And the online concentration detector 38, the temperature sensor 35, the dust sensor, the liquid level sensor 34, the pressure sensor 36 and the like of each production device are connected and communicated with the PLC control system.
The full-automatic PLC control system comprises an upper computer, a distributed I/O slave station (the slave station is provided with a wireless transmitter and an omnidirectional antenna), a control box arranged on site, a touch screen and a fault alarm. All signals can be transmitted to a remote central control PLC system through a slave station, the touch screen at the machine side can also feed back and control various actual actions and running states of the field equipment in real time, and the control box at the machine side can manually start and stop the field equipment. When equipment fails or gives an alarm, the alarm interfaces of the touch screen and the upper computer of the central control room are displayed, the time of the failed equipment and the time of the failed equipment can be quickly found in the fault alarm record, and the fault information is still kept in the alarm record for 1 year after the alarm is reset. The 485-modbus has the main functional blocks divided into: the method comprises the following steps of configuring system hardware equipment, configuring a control algorithm, configuring a graph, configuring a report, modifying an operator station human-computer interface on line, downloading a control program to a field control station by means of redundant 485-modbus, debugging on line and the like. The operator station runs a corresponding real-time monitoring program to monitor and control the entire system. The field control station mainly includes an FM series main control unit and an I/O (input/output) unit. The core equipment of the field control station of the FM801 main control unit 485-modbus system adopts a hot backup mode for redundancy, namely, hardware is used in pairs and mutually stands by, and the functions of automatic undisturbed switching, data acquisition and processing, control operation and the like can be realized; data exchange with the engineer/operator station is effected via redundant ethernet interfaces. The I/O unit completes the connection of the field instrument signal and collects and converts the input signal. The 485-modbus system provides several types of I/O units, and the system will be very useful in the engineering configuration process to ensure accurate implementation of the control scheme. The field control adopts a distributed structure design, and the expandability is strong. The design, operation and monitoring of a control strategy program are realized, and the off-line simulation debugging of the algorithm is supported; supporting two modes of incremental downloading and complete downloading of the master control unit database; all data in the current project may be read from the master control unit. The control functions of loop regulation, mathematical operation, logic operation, alarm and the like are realized by combining some functional modules, and each functional module is provided with an input pin and an output pin for signal interconnection among the modules. Various process graphs can be easily manufactured by utilizing a graph editor, each graph element on a picture has respective corresponding static characteristics (rotation, stretching, copying, pasting and the like of graphs such as points, lines, circles, rectangles and the like), dynamic characteristics (numerical value display, filling, flashing, color changing and the like) and interactive characteristics (control functions of various operation buttons, graph switching, parameter modification and the like), and programming interface functions can access all variables, alarms, trends, graphs, control and communication interfaces of the system.
Example 2
The process for producing nano calcium carbonate using the production line described in example 1 was:
(1) the screened quicklime is sent into a bin 1, the quicklime in the bin falls onto a metering weighing belt conveyor 3 through an electromagnetic vibration feeder 2 and is conveyed into a trough type slaker 4; the process water enters the digestion water tank 12 after being primarily heated up by the second heat exchanger 31 along the second branch 13 of the water supply pipeline. The slaked water in the slaking water tank 12 is pumped into the slaking water pipeline 8 through the slaking water pump 11, the slaking water in the slaking water pipeline 8 exchanges heat with the steam in the steam pipeline 10 in the first heat exchanger 9, the slaking water is further heated and then enters the groove-type slaking machine 4, and the lime in the groove-type slaking machine 4 reacts with the slaking water to obtain the coarse slurry of the calcium hydroxide.
(2) The coarse slurry enters a coarse slurry tank after being screened by a first circular vibrating screen 15, when the liquid level of the coarse slurry in the coarse slurry tank reaches a certain height, a PLC control system starts a coarse slurry stirrer 18 to stir, simultaneously starts a coarse slurry pump 19 to pump the slurry in the coarse slurry tank into a secondary coarse slurry tank 20, when the liquid level of the slurry in the secondary coarse slurry tank 20 reaches a certain height, the PLC control system starts a secondary coarse slurry stirrer 21 to stir, simultaneously starts a secondary coarse slurry pump 22 and a hydrocyclone 23 to send the slurry in the secondary coarse slurry tank 20 into the hydrocyclone 23; the PLC control system adjusts the flow rates of the secondary coarse slurry pump 22 and the hydrocyclone 23 according to the pressure monitored by the pressure sensor 36 on the connecting pipeline between the secondary coarse slurry pump 22 and the hydrocyclone 23.
(3) The slurry discharged from the discharge end of the hydrocyclone 23 and the production water from the first branch 14 of the water supply pipeline enter a second circular vibrating screen 24 for further screening treatment, and the obtained fine slurry flows into a fine slurry tank 25 along a connecting pipeline for temporary storage; the water to be recovered discharged from the hydrocyclone 23 and the water to be recovered discharged from the second circular vibrating screen 24 enter the recovery water tank 32 through a connecting pipeline, and the water to be recovered in the recovery water tank 32 is sent to a filter-pressing working section through the recovery water pump 33 for post-treatment.
(4) When the liquid level of the slurry in the slurry tank 25 reaches a certain height, the liquid level sensor 34 on the slurry tank 25 transmits the liquid level information to the PLC control system, and the PLC control system starts the slurry pump 26 to feed the slurry temporarily stored in the slurry tank 25 into the slurry tank 27 through the slurry pump 26.
(5) When the liquid level of thick liquid in the fine pulp jar 27 reachd the take the altitude, PLC control system starts fine pulp agitator 28 stirring and starts fine pulp pump 29 simultaneously, and fine pulp liquid sends into fine pulp pipeline 30 through fine pulp pump 29, and fine pulp pipeline 30 realizes the heat exchange with the production water in the water supply pipeline second branch 13 in second heat exchanger 31, realizes heat recovery, and fine pulp liquid gets into the workshop section of sizing mixing.
The statistics of the particle size distribution of the nano calcium carbonate particles prepared by the above process are shown in fig. 2.
Claims (2)
1. A PLC controlled full-automatic nano calcium carbonate digestion production line is characterized by comprising a full-automatic PLC control system and field production equipment;
production facility shakes including slot type digesting machine, digestion water pitcher, first heat exchanger, first circle and sieves, thick liquid jar, waste water jar, second grade thick liquid jar, hydrocyclone separator, second circle and sieves, retrieves water pitcher, thin thick liquid jar, smart thick liquid jar and second heat exchanger, wherein:
A. a trough type digestion machine: the feed end of the groove type slaker is connected with a quicklime feeding device and a slaking water pipe, and the discharge end of the groove type slaker is connected with a first circular vibrating screen; a moisture discharge pipeline is arranged above the groove type digestion machine, a water film sprayer is arranged at the upper end of the moisture discharge pipeline and is connected with an emptying pipeline, and a temperature sensor and a dust sensor are respectively arranged on the moisture discharge pipeline; the waste water discharge end of the trough type digester is connected with a waste water tank through a pipeline;
B. digestion water tank: the water inlet end of the digestion water tank is connected with a water supply pipeline of the second heat exchanger, the water outlet end of the digestion water tank is connected with a digestion water pump, a temperature sensor and a liquid level sensor are arranged on the digestion water tank, and the liquid level sensor is connected and communicated with the digestion water pump;
the digestion water pump sends the digestion water in the tank into the tank-type digestion machine and the water film sprayer through a digestion water pipeline, the heat exchange is carried out between the midstream of the digestion water pipeline and the steam in the steam pipeline at the first heat exchanger, the upstream of the digestion water pipeline is provided with a pressure sensor, a flow sensor and a flow valve which are connected and communicated, and the downstream of the digestion water pipeline is provided with a temperature sensor and is connected and communicated with the flow valve arranged on the steam pipeline;
C. a first circular vibrating screen: the feeding end of the first circular vibrating screen is connected with the discharging end of the trough type digestion machine, and a temperature sensor is arranged on a connecting pipeline; the discharge end of the first circular vibrating screen is connected with a coarse slurry tank; the waste water discharge end of the first circular vibrating screen is connected with a waste water tank through a pipeline;
an online concentration detector and a temperature sensor are arranged on a connecting pipeline between the groove type digester and the first circular vibrating screen;
D. a coarse slurry tank: the feeding end of the coarse slurry tank is connected with the discharging end of the first circular vibrating screen, and the discharging end of the coarse slurry tank is connected with the secondary coarse slurry tank through a coarse slurry pump; a coarse slurry stirrer is arranged in the coarse slurry tank, and a liquid level sensor connected and communicated with a coarse slurry pump is arranged on the coarse slurry tank; a pressure sensor and a flow valve are arranged on a connecting pipeline of the coarse slurry pump and the secondary coarse slurry tank;
E. a waste water tank: wastewater discharged by the trough type digester and wastewater discharged by the first circular vibrating screen flow into a wastewater tank through a wastewater pipeline;
F. a secondary coarse slurry tank: the feed end of the second-stage coarse slurry tank is connected with a coarse slurry pump, and the discharge end of the second-stage coarse slurry tank is connected with a hydrocyclone separator through a second-stage coarse slurry pump; a second-stage coarse pulp stirrer is arranged in the second-stage coarse pulp tank, and a temperature sensor and a liquid level sensor which is connected and communicated with the second-stage coarse pulp pump are arranged on the second-stage coarse pulp tank; a pressure sensor and a flow valve are arranged on a connecting pipeline of the secondary coarse slurry pump and the hydrocyclone separator;
G. a hydrocyclone: the feed end of the hydrocyclone separator is connected with a second-stage coarse slurry pump, and the discharge end of the hydrocyclone separator and the first branch of the water supply pipeline are connected with the feed end of the second circular vibrating screen; the discharge end of the water to be recovered of the hydrocyclone separator is connected with a recovery water tank;
H. a second circular vibrating screen: the discharge end of the second circular vibrating screen is connected with the fine pulp tank; the discharge end of the water to be recovered of the second circular vibrating screen is connected with a recovery water tank;
I. a water recovery tank: pumping the water to be recovered in the recovery water tank to a filter pressing working section through a recovery water pump for post-treatment; a liquid level sensor connected and communicated with the recovery water pump is arranged on the recovery water tank;
J. fine slurry tank: the discharge end of the fine pulp tank is connected with the feed end of the fine pulp tank through a fine pulp pump, and the fine pulp tank is provided with a temperature sensor and a liquid level sensor which is connected and communicated with the fine pulp pump; a pressure sensor and a flow valve are arranged on a connecting pipeline of the fine pulp pump and the fine pulp tank;
K. a refined pulp tank: the discharge end of the fine pulp tank is conveyed to a size mixing working section through a fine pulp pump for post-treatment; a fine pulp stirrer is arranged in the fine pulp tank, and a temperature sensor and a liquid level sensor which is connected and communicated with the fine pulp pump are arranged on the fine pulp tank; a pressure sensor and a flow valve are arranged on a connecting pipeline from the fine pulp pump to the pulp mixing working section, and the connecting pipeline enters the pulp mixing working section after heat exchange with a second branch of a water supply pipeline of a second heat exchanger;
the full-automatic PLC control system includes:
l, an upper computer,
m, a distributed I/O slave station, wherein the slave station is provided with a wireless transmitter and an omnidirectional antenna; and the number of the first and second groups,
n, a control box, a touch screen and a fault alarm which are arranged on site;
and the online concentration detector, the temperature sensor, the dust sensor, the liquid level sensor and the pressure sensor of each production device are all connected and communicated with the PLC control system.
2. The PLC-controlled full-automatic nano calcium carbonate digestion production line according to claim 1, wherein the coarse pulp tank is a double-tank body and is composed of a first tank body and a second tank body, and a communication pipeline is arranged between the first tank body and the second tank body; the feed end of the first tank body is connected with the discharge end of the first circular vibrating screen, the discharge end of the first tank body and the discharge end of the second tank body are connected with a coarse pulp pump, and a liquid level sensor on the coarse pulp tank is arranged on the second tank body.
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| CN108529906B (en) * | 2018-06-29 | 2024-01-19 | 刘寒 | Quicklime digestion system and working method thereof |
| US11623174B2 (en) * | 2018-11-27 | 2023-04-11 | Vortx Kleanair Systems | Temperature controlled exhaust steam water filter for coffee roasters |
| CN110262596A (en) * | 2019-06-19 | 2019-09-20 | 常熟美特钙业有限公司 | A kind of temperature control control technique of calcium carbonate slurry concentration |
| CN112374775A (en) * | 2020-12-08 | 2021-02-19 | 襄阳聚曐矿业有限公司 | Quick lime efficient digestion device and digestion method |
| CN112920431B (en) * | 2021-01-26 | 2023-04-14 | 佛山市三水区康立泰无机合成材料有限公司 | Preparation method and application of inorganic water-based filler slurry |
| CN114315177B (en) * | 2021-12-22 | 2024-01-19 | 靖江市得意节能科技有限公司 | Equipment is cleared up to calcium oxide |
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