CN113325814B - Automatic control system for safe production of high-tower nitro fertilizer - Google Patents
Automatic control system for safe production of high-tower nitro fertilizer Download PDFInfo
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- CN113325814B CN113325814B CN202110644485.8A CN202110644485A CN113325814B CN 113325814 B CN113325814 B CN 113325814B CN 202110644485 A CN202110644485 A CN 202110644485A CN 113325814 B CN113325814 B CN 113325814B
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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]
- G05B19/41875—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 quality surveillance of production
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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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32368—Quality control
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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 provides an automatic control system for the safe production of high-tower nitro-fertilizer, which comprises at least two mixing tanks for producing nitro-fertilizer, wherein equipment components required by each mixing tank for producing the nitro-fertilizer safely comprise a temperature detector for detecting the temperature of the mixing tank, a heating valve arranged on a steam pipeline for controlling the on and off of the steam pipeline, a water adding valve arranged on a cold water pipeline for controlling the cold water pipeline and a motor for controlling a stirrer; when the primary interlocking condition is met, controlling the heating valve to close the corresponding steam pipeline so as to stop supplying steam into the corresponding mixing tank continuously; the primary interlock condition is related to the temperature of the mixing tank; when the secondary interlocking condition is met, controlling a water adding valve to open a corresponding cold water pipeline so as to add cold water into a corresponding mixing tank for cooling; the secondary interlock condition is related to the temperature of the mixing tank, the current signal of the motor, and the operating state of the motor. The invention can realize scientific, high-efficiency and safe production.
Description
Technical Field
The invention belongs to the technical field of control, and particularly relates to an automatic control system for safe production of high-tower nitro fertilizer.
Background
Ammonium nitrate is used as a basic raw material to produce a compound fertilizer on a high tower to become a nitro-fertilizer, and because the ammonium nitrate has the characteristic of explosive decomposition possibly caused by heating, the production safety of the nitro-fertilizer is always the key point of industry attention, and the current general safety control measures adopted in the industry are as follows: set up the temperature point in the mixing tank of high tower, set up temperature overtemperature warning and interlock value, when the temperature reaches the interlock value, close heating steam and add water cooling to the mixing tank simultaneously to reach the effect that reduces the ground paste temperature and avoid the decomposition of overtemperature to explosion.
Fig. 2 is a system structure diagram for producing a nitro-fertilizer, the production process of the nitro-fertilizer includes three mixing tanks, and the temperatures of the three mixing tanks need to be monitored in the production process, that is, a first-stage mixing tank temperature-measuring point TIC112, a second-stage mixing tank temperature-measuring point TIC113, and a third-stage mixing tank temperature-measuring point TIC114, the control logic for producing the nitro-fertilizer in the prior art is shown in fig. 1, when the temperature at the temperature-measuring point regulated by one mixing tank exceeds a set threshold, cold water needs to be added, and cold water is also added to the other mixing tanks whose temperatures do not exceed the set threshold, which leads to water resource waste;
the production of the nitro-fertilizer based on the control logic has the following problems:
(1) the control method only considers safety and does not fully consider production, finished product particles cannot be prepared from the slurry after water is added, and only the slurry can be discharged, so that production waste is caused;
(2) when any tank (such as a first-stage mixing tank) is over-temperature, other two tanks (a second-stage mixing tank and a third-stage mixing tank) without over-temperature can simultaneously add water, so that unnecessary water resource waste is caused;
(3) the operation process discovery, when the agitator of mixing tank breaks down, during unable stirring, the unable mixture of material in the mixing tank easily causes the thick liquids mobility poor promptly, and heat transfer effect is poor to there is the possibility that causes the local super temperature decomposition of thick liquids, local material is heated rapidly and is decomposed and cause the accident easily to appear, causes the safety risk. Stirrer failure is mainly in three cases: firstly, the stirring paddle falls off or is damaged, secondly, a transmission shaft of the stirrer is broken, and thirdly, the overload protection of a motor is caused by the large load of the stirrer. The first two cases are embodied as low motor operating current, and the third case is embodied as a motor fault shutdown. The existing control logic does not make a precautionary measure against the important hazard factor, and has serious careless leakage, so that the existing control measure does not consider how to control slurry does not flow because of the failure of slurry stirring of the mixing tank.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies in the prior art.
Disclosure of Invention
The invention aims to provide an automatic control system for the safe production of high-tower nitro fertilizers, which is used for overcoming the problems in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the utility model provides a fertile safety in production automatic control system of high tower nitro-compound, the system includes at least two mixing tanks that are used for producing the nitryl-compound, and the required equipment subassembly of nitryl-compound of every mixing tank safety in production includes:
a temperature detector for detecting a temperature of the mixing tank;
the heating valve is arranged on the steam pipeline and used for controlling the connection and disconnection of the steam pipeline; when the production of the nitro-fertilizer is started, controlling a heating valve to lead a steam pipeline so as to lead hot steam into the mixing tank and increase the temperature of the mixing tank;
the water adding valve is arranged on the cold water pipeline and used for controlling the on and off of the cold water pipeline;
the motor is used for controlling the stirrer to mix and stir the chemical raw materials in the mixing tank;
when the primary interlocking condition is met, controlling the heating valve to close the corresponding steam pipeline so as to stop supplying steam into the corresponding mixing tank continuously; the primary interlock condition is related to the temperature of the mixing tank;
when the secondary interlocking condition is met, controlling a water adding valve to open a corresponding cold water pipeline so as to add cold water into a corresponding mixing tank for cooling; the secondary interlock condition is related to the temperature of the mixing tank, the current signal of the motor, and the operating state of the motor.
Further, the temperature detectors include two, which respectively obtain the first temperature and the second temperature of each mixing tank.
Further, the primary interlocking condition is that the first temperature or the second temperature of the mixing tank is greater than the first set temperature.
Further, the secondary interlocking condition includes:
a first sub-condition relating to a temperature of the mixing tank, a second set temperature; the second set temperature is greater than the first set temperature;
a second sub-condition relating to a current value of the motor;
a third sub-condition relating to an operating state of the electric machine; the operational state includes stop and run.
Further, the first sub-condition is that the first temperature or the second temperature of the mixing tank is greater than a second set temperature.
Further, the second sub-condition is that the current value of the motor is smaller than the set current value.
Further, the third sub-condition is that the motor state is stop running.
Further, the difference between the first set temperature and the second set temperature is at least 5 degrees.
Has the advantages that:
according to the automatic control system for the safe production of the high-tower nitro-fertilizer, the temperature of each mixing tank in the production process is detected in real time, the temperature of the mixing tank is judged, when a primary interlocking condition is met, the heating valve is controlled to turn off the steam pipeline to stop supplying steam to the corresponding mixing tank continuously, in addition, the current value and the running state of the motor are also detected, and when a secondary interlocking condition is met, the water adding valve is controlled to open the corresponding cold water pipeline to add cold water into the corresponding mixing tank for cooling; the invention can achieve scientific and high-efficiency automatic control system for high-tower safe production of the nitro-fertilizer by reasonably arranging the two-stage interlocking automatic control system of the mixing tank on the high tower.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:
FIG. 1 is a logic diagram of an automatic control method for the safety production of high-tower nitro-fertilizer in the prior art;
FIG. 2 is a structural diagram of an automatic control system for the safe production of high-tower nitro-fertilizer;
FIG. 3 is a first-level interlocking control logic diagram of the automatic control system for the production of the nitro-fertilizer for the safety life of the invention;
FIG. 4 is a two-stage interlocking control logic diagram of the automatic control system for the production of the nitro-fertilizer by the Ansheng process.
Description of the drawings: 1. a primary mixing tank; 2. a secondary mixing tank; 3. a third-stage mixing tank; 4. a first mixing agitator; 5. a second mixing agitator; 6. a third mixing agitator; 7. a first telemetering thermometer; 8. a second remote thermometer; 9. a third telemetering thermometer; 10. a first warming valve; 11. a second warming valve; 12. a third warming valve; 13. a first feed regulating valve; 14. a second feed regulating valve; 15. a third feed regulating valve; 16. a fourth feed regulating valve; 17. a water tank; 18. a first water adding valve; 19. a second water adding valve; 20. a third water adding valve; 21. a first and second telemetering thermometer; 22. a second remote thermometer; 23. and a third remote thermometer.
Detailed Description
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the application and are not limiting of the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
The utility model provides a fertile safety in production automatic control system of high tower nitro-compound, includes at least two mixing tanks that are used for producing the nitryl-compound, and the required equipment subassembly of the fertile safety in production nitryl-compound of every mixing tank includes:
two temperature detectors for detecting the temperature of the mixing tank;
the heating valve is arranged on the steam pipeline and used for controlling the connection and disconnection of the steam pipeline;
when the nitro-fertilizer begins to be produced, controlling the heating valve to lead the steam pipeline to lead hot steam into the mixing tank so as to raise the temperature of the mixing tank;
the water adding valve is arranged on the cold water pipeline and used for controlling the on and off of the cold water pipeline;
the motor is used for controlling the stirrer to mix and stir the chemical raw materials in the mixing tank;
when the primary interlocking condition is met, controlling the heating valve to close the steam pipeline so as to stop supplying steam into the corresponding mixing tank continuously; the primary interlock condition is related to the temperature of the mixing tank;
when the secondary interlocking condition is met, controlling a water adding valve to open a corresponding cold water pipeline so as to add cold water into a corresponding mixing tank for cooling; the secondary interlock condition is related to the temperature of the mixing tank, the current signal of the motor, and the operating state of the motor.
The automatic control system detects the temperature of each mixing tank in the production process in real time, judges the temperature of the mixing tanks, controls the heating valve to shut off the steam pipeline to stop supplying steam into the corresponding mixing tank when the primary interlocking condition is met, and controls the water filling valve to open the corresponding cold water pipeline to add cold water into the corresponding mixing tank to cool when the secondary interlocking condition is met; the safe production of the nitro-based fertilizer can be ensured through two-stage interlocking.
In order to more clearly illustrate the technical scheme of the invention, the following is described in detail with reference to the schematic structural diagram of the automatic control system for the safe production of the high-tower nitro-fertilizer shown in fig. 2.
In the embodiment of the present application, three mixing tanks are taken as an example, and each mixing tank is a unit, so that the system includes three units, namely, a primary mixing tank 1, a secondary mixing tank 2 and a tertiary mixing tank 3; for the primary mixing tank 1, the upper end of the primary mixing tank 1 is connected with a feeding pipe and a valve for controlling the on-off of the feeding pipe, namely a first feeding valve 13 and a second feeding valve 14, the ammonium nitrate can be controlled to be fed into the primary mixing tank 1 by controlling the opening of the first feeding regulating valve 13, and other powdery materials can be controlled to be fed into the primary mixing tank 1 by controlling the second feeding regulating valve 14; in the production process of the nitro-fertilizer, a first motor is controlled to drive a first stirrer 4 to stir the feed in a mixing tank, the interior of a first-stage mixing tank 1 is heated by controlling a heating valve 10, the production process requirement of the nitro-fertilizer is met, if the temperature in the first-stage mixing tank 1 is too high, danger can occur, and in order to ensure the safe production of the nitro-fertilizer, a temperature detector comprises two telemetering thermometers, namely a first one-to-one telemetering thermometer 7 and a first two-to-two telemetering thermometer 21, the first one-to-one telemetering thermometer 7 measures the temperature of a temperature measuring point TI112 of the first-stage mixing tank 1, and the first two-to-two telemetering thermometer 21 measures the temperature of a temperature measuring point TIC112 of the first-stage mixing tank 1; similarly, the related components arranged corresponding to the second-stage mixing tank 2 comprise a second stirrer 5, a third feed regulating valve 15, a second heating valve 11, a second remote thermometer 8 and a second remote thermometer 22; the relevant components provided in correspondence with the tertiary mixing tank 3 include a third stirrer 6, a fourth feed regulating valve 16, a third warming valve 12, a third first remote thermometer 8 and a third second remote thermometer 23.
The method comprises the steps of detecting the internal temperature of a first-stage mixing tank 1 in real time through a first remote thermometer 7 and a first second remote thermometer 21, detecting the internal temperature of a second-stage mixing tank 2 in real time through a second first remote thermometer 8 and a second remote thermometer 22, and automatically cooling through temperature information obtained by detecting the internal temperature of a third-stage mixing tank 3 in real time through a third first remote thermometer 9 and a third second remote thermometer 23, wherein in order to achieve the purpose of cooling, the method adopts the means of stopping heating (namely stopping steam supply) and introducing cold water into the mixing tank, can realize the purpose of stopping heating (namely stopping steam supply) through a heating stopping valve for stopping heating, and is provided with a water tank 17 for introducing cold water into the mixing tank, and is additionally provided with a first water adding valve 18 and a second water adding valve for respectively controlling different mixing tanks, And a second water adding valve 19 and a third water adding valve 20 are respectively and correspondingly controlled whether water is introduced into the first-stage mixing tank 1, the second-stage mixing tank 2 and the third-stage mixing tank 3.
The automatic control system for safe production of the nitro-fertilizer mainly realizes monitoring control on the production state of the mixing tank in the production process by detecting the temperature in the mixing tank, and then controls the corresponding first heating valve 10, second heating valve 11 and/or third heating valve 12 to stop heating when the temperature of a certain mixing tank rises and meets the primary interlocking condition, so as to avoid the temperature from rising continuously; with the continuous rise of the temperature in a certain mixing tank in the production process, when the second-stage interlocking condition is met, the first water adding valve 18, the second water adding valve 19 and the third water adding valve 20 are controlled to be opened, and the cold water in the water tank 17 flows into different mixing tanks to be cooled so as to achieve the purpose of safe production.
In the embodiment of the present application, for the primary mixing tank 1, the first telemetering thermometer 7 is disposed at the temperature measuring point TI112 of the primary mixing tank 1, and is used for measuring the temperature of the temperature measuring point TI112, that is, the first temperature of the primary mixing tank 1, and the first telemetering thermometer 21 is disposed at the temperature measuring point TIC112 of the primary mixing tank 1, and is used for measuring the temperature of the temperature measuring point TIC113, that is, the second temperature of the secondary mixing tank 2; for the secondary mixing tank 2, the second first telemetering thermometer 8 is arranged at the temperature measuring point TI113 of the secondary mixing tank 2 for measuring the temperature of the temperature measuring point TI113, that is, the first temperature of the secondary mixing tank 2, and the second telemetering thermometer 22 is arranged at the temperature measuring point TIC113 of the secondary mixing tank 2 for measuring the temperature of the temperature measuring point TIC113, that is, the second temperature of the secondary mixing tank 2; for the third-stage mixing tank 3, the third first telemetric thermometer 9 is provided at a temperature measurement point TI114 of the third-stage mixing tank 3 for measuring the temperature of the temperature measurement point TI114, that is, the first temperature of the third-stage mixing tank 3, and the third second telemetric thermometer 23 is provided at a temperature measurement point TIC114 of the third-stage mixing tank 3 for measuring the temperature of the temperature measurement point TIC114, that is, the second temperature of the third-stage mixing tank 3.
For the detection of the temperature of the mixing tank, a primary interlocking and a secondary interlocking are arranged, wherein the condition of the primary interlocking is that the first temperature or the second temperature of the mixing tank is greater than a first set temperature, when the condition of the primary interlocking is met, a heating valve is controlled to turn off a corresponding steam pipeline so as to stop continuously supplying steam into the corresponding mixing tank, the condition of the secondary interlocking comprises a first sub-condition, the first sub-condition is related to the temperature of the mixing tank and a second set temperature, specifically, the first sub-condition is that the first temperature or the second temperature of the mixing tank is greater than the second set temperature, and the second set temperature is greater than the first set temperature; and when the first sub-condition of the two-stage interlocking is met, controlling the water adding valve to open the corresponding cold water pipeline so as to add cold water into the corresponding mixing tank for cooling. Wherein the second settlement temperature is 5 degrees with first settlement temperature difference in temperature at least, sets up two settlement temperatures that have the difference in temperature, can realize the two-stage interlocking of temperature, and the interlocking breaks steam when the temperature in the mixing tank is greater than first settlement temperature, and the interlocking adds cold water when the temperature in the mixing tank is greater than the second settlement temperature, realizes more reasonable two-stage interlocking control.
In order to avoid waste of mixed materials which are not over-heated during interlocking in the operation process, a frequency converter is added ON a motor corresponding to a stirrer, a current signal and a fault signal (namely an operation state, namely a signal output by the frequency converter is changed from normally closed ON to OFF) of the operation of the motor are introduced into a DOC control system, whether the operation of the stirrer is normal or not is judged according to the current value and the operation state of the motor, and when the current value of the motor is lower than a set current value (the set current value is set as the minimum value when no slurry in a mixing tank corresponds to the idling of the stirrer, the stirrer does not normally work. Therefore, low-current interlocks are respectively set for the three mixing tanks, so that the two-stage interlock connection of the present application further includes a second sub-condition and a third sub-condition, the second sub-condition is related to the current value of the motor, specifically, the current value of the motor is smaller than the set current value, and when the current value of the motor is smaller than the set current value, the water adding valve can be controlled to open the corresponding cold water pipeline so as to add cold water into the corresponding mixing tank for cooling; the third sub-condition is related to the running state of the motor, the running state comprises running and stopping running, and when the running state of the motor is stopping running, the water adding valve can be controlled to open the corresponding cold water pipeline so as to add cold water into the corresponding mixing tank for cooling.
The three mixing tanks are provided with low-current interlocking, so that the phenomenon that the stirring blades fall off or the stirring shaft falls off or stirring is stopped to cause the static heat accumulation of slurry in the tanks, and the material is decomposed and exploded at an excessive temperature is avoided; when the low current interlocking occurs during stirring, all feeding materials in the tank are automatically cut off (heating steam is automatically cut off and primary interlocking caused by overtemperature is not used in the process), the heating steam in the tank is automatically cut off, and if the temperature rises again to trigger overtemperature secondary interlocking conditions, water is automatically added into the tank for cooling, so that the safety is ensured. Therefore, on the basis of targeted automatic control to the maximum extent, unnecessary waste of production materials is reduced, and meanwhile, production safety is fundamentally ensured.
Fig. 3 is a first-level interlocking control logic diagram of an automatic control system for the safety production of the nitro-fertilizer, fig. 4 is a second-level interlocking control logic diagram of the automatic control system for the safety production of the nitro-fertilizer, and the control logic of the automatic control system for the safety production of the nitro-fertilizer is further described with reference to fig. 2-4.
In the embodiment of the invention, each mixing tank in the automatic control system is independently interlocked and controlled as a unit, wherein the first set temperature is 180 ℃, and the second set temperature is 185 ℃.
In the safe production process of the nitro-fertilizer, detecting the temperature of the mixing tank in real time, when primary interlocking is carried out, judging that the temperature of the primary mixing tank 1 is higher than the primary interlocking condition when the first temperature of the primary mixing tank 1 obtained through a temperature measuring point TI112 of the primary mixing tank 1 or the second temperature of the primary mixing tank 1 obtained through a temperature measuring point TIC112 exceeds 180 ℃, only controlling to close a first heating valve TV112 of the primary mixing tank 1, and stopping continuously supplying steam into the primary mixing tank 1; when the first temperature of the secondary mixing tank 2 obtained through the temperature measuring point TI113 of the secondary mixing tank 2 or the second temperature of the secondary mixing tank 2 obtained through the temperature measuring point TIC113 exceeds 180 ℃, judging that the temperature of the secondary mixing tank 2 is higher than a primary interlocking condition, only controlling to close the second heating valve TV113 of the secondary mixing tank 2, and stopping continuously supplying steam into the secondary mixing tank 2; when the first temperature of the three-stage mixing tank 3 obtained through the temperature measuring point TI114 of the three-stage mixing tank 3 or the second temperature of the three-stage mixing tank 3 obtained through the temperature measuring point TIC114 exceeds 180 ℃, the temperature of the three-stage mixing tank 3 is judged to be higher to reach the first-stage interlocking condition, only the third heating valve TV114 of the three-stage mixing tank 3 is controlled to be closed, and the steam is stopped to be continuously supplied into the three-stage mixing tank 3.
With the continuous production operation of the stirrer in the mixing tank, the secondary interlocking control is carried out on the basis of the primary interlocking control, and at the moment, the temperature of each mixing tank needs to be continuously detected, and the current value of the motor and the operation state of the motor also need to be detected. Specifically, when the first temperature of the primary mixing tank 1 exceeds 185 degrees, the second temperature of the primary mixing tank 1 exceeds 185 degrees, the first motor current value AI110C corresponding to the primary mixing tank 1 is less than 16A or the motor is stopped (P110C is OFF), it is determined that the secondary interlocking condition is met, and only the first water adding valve HV107 corresponding to the primary mixing tank 1 is controlled to be opened, and the primary mixing valve 1 starts to be filled with cold water to cool; when the first temperature of the secondary mixing tank 2 exceeds 185 ℃, the second motor current value AI110B corresponding to the secondary mixing tank 2 is less than 16A or the motor stops running (P110B is OFF), judging that the secondary interlocking condition is reached, only controlling to open the second water adding valve HV106 corresponding to the secondary mixing tank 2, and starting to introduce cold water into the secondary mixing tank 2 for cooling; when the first temperature of the third-stage mixing tank 3 exceeds 185 degrees, the second temperature of the third-stage mixing tank 3 exceeds 185 degrees, the third motor current value AI110A corresponding to the third-stage mixing tank 3 is less than 16A, or the motor is stopped (P110A is OFF), it is determined that the second-stage interlocking condition is met, and only the third water adding valve HV105 corresponding to the third-stage mixing tank 3 is controlled to be opened, and the cooling is started by introducing cold water into the third-stage mixing tank 3.
Based on the above detailed introduction to the control logic of the high-tower nitro fertilizer safety production control system, it can be known that:
(1) this application changes original integral control mode (the three mixing tank constitutes the joint interlocking of an AND door), revises for the independent interlocking that is a unit respectively with every mixing tank, can be independent control different mixing tanks, effectively avoids causing unnecessary interference to other normal, safety in production's mixing tanks.
(2) The interlocking control of this application is provided with the two-stage interlocking respectively, can avoid when interlocking in the safety in-process, and the mixing tank material that does not overtemperature is extravagant, can also prevent that the stirring paddle leaf from dropping or the (mixing) shaft drops or perhaps the stirring stops to cause the interior stagnant heat of ground paste of groove to gather to cause the material to break down the explosion at an overtemperature, guaranteed production safety fundamentally.
(3) In order to better judge the reaction temperature condition of the mixing tanks, each mixing tank is additionally provided with a temperature measuring point, and any one of the two temperature measuring points can be interlocked when overtemperature occurs; and the over-temperature interlocking of each mixing tank is divided into two stages: the primary interlocking content is that when any one of two temperature measuring points of the mixing tank exceeds a first set temperature (180 ℃), a steam heating valve of the mixing tank is automatically closed, and an external heating source is cut off; secondary interlocking content: when the current of the stirring motor is lower than 16A, the stirring motor stops running, any one of the two temperature measuring points exceeds a second set temperature (185 ℃), the cooling and water adding valve is automatically opened, water is rapidly added for dilution and cooling, and the feeding of the feeding belt is stopped.
(4) The bottom of a three-stage mixing tank on a high tower is respectively added with a thermocouple, the thermocouple and the original thermocouple are in the direction of 180 degrees, the temperature display is added to observe whether the temperature difference in the mixing tank is normal or not at any time (the temperature display difference is within 2 ℃, the thermocouple is normal), two thermocouples in each mixing tank are respectively used as reference values for temperature overtemperature alarm and interlocking indication, two stages of temperature overtemperature interlocking are arranged, when the temperature of a certain mixing tank first reaches one stage, heating steam in the mixing tank is cut off, if the temperature rises again to reach two cascaded locking values, water is automatically added into the tank for cooling, and the safety is ensured. The temperature difference between the first stage and the second stage is more than 5 ℃ according to the characteristic of the temperature rise of the nitro-fertilizer, the temperature controlled by two stages in an interlocking way is more than 5 ℃, the nitro-fertilizer slurry is considered to be actually heated continuously, the temperature is further controlled, and the temperature difference range can be determined to be more than 5 ℃.
In conclusion, the production system of the nitro-fertilizer scientifically ensures the production safety by the automatic treatment measure aiming at the overtemperature, and reduces unnecessary waste of production materials caused by safe treatment to the maximum extent; the method has demonstration significance for the automatic control of the safe production of the high-tower nitro-based fertilizer.
The above embodiments are only for illustrating the technical solutions of the present application and not for limiting the same, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (2)
1. The utility model provides a fertile safety in production automatic control system of high tower nitro-compound, the system includes at least two mixing tanks that are used for producing the nitryl-compound, its characterized in that, the fertile required equipment subassembly of nitryl-compound of every mixing tank safety production includes:
a temperature detector for detecting a temperature of the mixing tank;
the heating valve is arranged on the steam pipeline and used for controlling the connection and disconnection of the steam pipeline; when the production of the nitro-fertilizer is started, controlling a heating valve to lead a steam pipeline so as to lead hot steam into the mixing tank and increase the temperature of the mixing tank;
the water adding valve is arranged on the cold water pipeline and used for controlling the on and off of the cold water pipeline;
the motor is used for controlling the stirrer to mix and stir the chemical raw materials in the mixing tank;
the temperature detectors comprise two temperature detectors, and the first temperature and the second temperature of each mixing tank are respectively obtained;
when the primary interlocking condition is met, controlling the heating valve to close the corresponding steam pipeline so as to stop supplying steam into the corresponding mixing tank continuously; the primary interlocking condition is that the first temperature or the second temperature of the mixing tank is higher than a first set temperature;
when the secondary interlocking condition is met, controlling a water adding valve to open a corresponding cold water pipeline so as to add cold water into a corresponding mixing tank for cooling;
the secondary interlocking conditions include:
a first sub-condition that either the first temperature or the second temperature of the mixing tank is greater than a second set temperature; the second set temperature is greater than the first set temperature;
a second sub-condition that a current value of the motor is smaller than a set current value;
and a third sub-condition that the motor state is a stop operation.
2. The automatic control system for the safe production of the high-tower nitro-fertilizer according to claim 1, wherein the difference between the first set temperature and the second set temperature is at least 5 degrees.
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Citations (9)
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