CN112044106A - Spray drying equipment for online controlling powder moisture and powder moisture control method - Google Patents
Spray drying equipment for online controlling powder moisture and powder moisture control method Download PDFInfo
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- CN112044106A CN112044106A CN202010921460.3A CN202010921460A CN112044106A CN 112044106 A CN112044106 A CN 112044106A CN 202010921460 A CN202010921460 A CN 202010921460A CN 112044106 A CN112044106 A CN 112044106A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D1/0082—Regulation; Control
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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Abstract
The invention provides a spray drying device for controlling powder moisture on line and a powder moisture control method, wherein the spray drying device comprises: the drying device comprises a cylinder body, wherein a sprayer is arranged in the cylinder body, and the cylinder body is provided with a feeding hole, a first air inlet for leading hot air into the cylinder body and a first powder discharging hole; the feeding device comprises a material tank, a material conveying pipe connected with the material tank and the sprayer, and a feeding pump arranged on the material conveying pipe; the temperature sensor is arranged in the first powder discharge port; a first closed-loop controller connected to the feed pump and the temperature sensor; a moisture sensor mounted in the barrel; and a second closed-loop controller connected to the first closed-loop controller and the moisture sensor. The invention solves the problems that the traditional spray dryer needs to be equipped with professional technicians to detect the moisture of the powder, the time consumption is long, and the moisture parameter information has larger hysteresis.
Description
Technical Field
The invention relates to the technical field of spray dryers, in particular to a spray drying device for controlling powder moisture on line and a powder moisture control method.
Background
The spray dryer is a device for obtaining a dried powder product by atomizing a liquid raw material in the form of a solution or slurry with an atomizer and then rapidly drying the atomized liquid raw material with hot air. For the powder material produced by the traditional spray dryer, if the moisture related parameter of the powder is to be obtained, separate sampling and detection are needed, on one hand, the moisture related parameter information has larger hysteresis; on the other hand, in the production process, a professional technician is required to perform powder sampling and detection repeatedly at regular time to ensure that the produced powder product meets the process requirements.
Disclosure of Invention
In order to overcome the defects in the prior art, a spray drying device for controlling the moisture of powder on line is provided so as to solve the problems that a traditional spray dryer needs to be equipped with professional technicians to detect the moisture of the powder, the time consumption is long, and the moisture parameter information has large hysteresis.
In order to achieve the above object, a spray drying device for controlling the moisture of powder on line is provided, which comprises:
the drying device comprises a cylinder body, wherein a sprayer is arranged in the cylinder body, and the cylinder body is provided with a feeding hole, a first air inlet for leading hot air into the cylinder body and a first powder discharging hole;
the feeding device comprises a material tank, a material conveying pipe connected with the material tank and the sprayer, and a feeding pump arranged on the material conveying pipe;
the temperature sensor is arranged in the first powder discharge port;
a first closed-loop controller connected to the feed pump and the temperature sensor;
a moisture sensor mounted in the barrel; and
and the second closed-loop controller is connected to the first closed-loop controller and the moisture sensor.
Further, the first closed-loop controller and the second closed-loop controller are respectively PID controllers.
Furthermore, the cyclone separator is provided with a powder inlet, a second air inlet for guiding cold airflow and a second powder discharge port, and the powder inlet is connected with the first powder discharge port through a powder discharge pipe.
Further, the temperature of the cold air flow is 30-40 ℃.
Further, the temperature of the hot air flow is 150-160 ℃.
Furthermore, the second closed-loop controller is connected with an alarm.
The invention provides a powder moisture control method of spray drying equipment for controlling the moisture of powder on line, which comprises the following steps:
presetting a powder moisture value range in a second closed-loop controller, converting the powder moisture value range into an exhaust air temperature value of a first powder exhaust port of a corresponding cylinder by the second closed-loop controller, and sending the exhaust air temperature value to the outside;
the first closed-loop controller receives the air exhaust temperature value, converts the air exhaust temperature value into a corresponding feed liquid pumping speed of the feed pump based on the air exhaust temperature value and sends the feed liquid pumping speed to the outside;
the feeding pump receives the feed liquid pumping speed, the feed liquid in the material tank is pumped to the sprayer through the feed delivery pipe at the feed liquid pumping speed, the sprayer atomizes the feed liquid, the first air inlet of the cylinder introduces hot air flow to dry the atomized feed liquid into powder, and the powder is discharged out of the cylinder through the first powder discharge port;
the temperature sensor collects a real-time air exhaust temperature value in the first powder exhaust port;
the first closed-loop controller obtains the real-time exhaust temperature value, calculates and obtains a temperature difference value between the real-time exhaust temperature value and the exhaust temperature value, corrects the feed liquid pumping rate based on the temperature difference value and sends the feed liquid to the outside, and the feed pump receives the corrected feed liquid pumping rate and pumps the feed liquid at the corrected feed liquid pumping rate, so that the real-time exhaust temperature value accords with the exhaust temperature value;
after the real-time exhaust temperature value accords with the exhaust temperature and the real-time exhaust temperature value is stable, a moisture sensor acquires the real-time moisture value of the powder in the first powder outlet;
the second closed-loop controller obtains the real-time moisture value, calculates and obtains a moisture difference value between the real-time moisture value and a preset moisture value range of the powder, corrects the exhaust air temperature value based on the moisture difference value and sends the exhaust air temperature value to the outside;
the first closed-loop controller receives the corrected exhaust temperature value and corrects the feed liquid pumping speed based on the corrected exhaust temperature value, and the feed pump pumps the feed liquid at the corrected feed liquid pumping speed, so that the real-time moisture value accords with a preset powder moisture value range.
Further, when the second closed-loop controller cannot acquire the real-time moisture value, the second closed-loop controller is disconnected from the first closed-loop controller, and the feed pump pumps the feed liquid at the last feed liquid pumping rate.
Furthermore, the second closed-loop controller is connected with an alarm, and when the step of acquiring the real-time moisture value by the second closed-loop controller is implemented, the second closed-loop controller opens the alarm to give an alarm when the real-time moisture value exceeds the moisture value range of the powder.
The spray drying equipment for controlling the moisture of the powder on line has the advantages that the feed pump, the temperature sensor and the first closed-loop controller form a closed-loop control system, the second closed-loop controller, the first closed-loop controller and the moisture sensor form another closed-loop control system, and therefore the spray drying equipment for controlling the moisture of the powder on line can accurately, intelligently, efficiently and real-timely adjust and monitor the moisture value of the powder on line through the double closed-loop control system.
Drawings
Fig. 1 is a schematic block diagram of a spray drying apparatus for controlling powder moisture on line according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a spray drying device for controlling powder moisture on line according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a schematic block diagram of a spray drying apparatus for online controlling moisture of powder according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a spray drying apparatus for online controlling moisture of powder according to an embodiment of the present invention.
Referring to fig. 1 and 2, the present invention provides a spray drying apparatus for controlling moisture of powder on line, comprising: the drying device comprises a drying device 1, a feeding device 2, a temperature sensor 3, a first closed-loop controller 4, a moisture sensor 5 and a second closed-loop controller 6.
Specifically, the drying device 1 includes a cylinder 11 and a sprayer 12. An atomizer 12 is arranged in the cylinder 11. In this embodiment, the sprayer is disposed on the top of the barrel. The cylinder is in an inverted cone shape. The barrel 11 is provided with a feeding hole, a first air inlet for leading hot air flow in and a first powder outlet 10. The hot airflow is conveyed into the barrel through the first air inlet, and the atomized feed liquid is dried at high temperature to obtain powder. The powder is discharged to the outside of the cylinder through the first powder discharge port.
The temperature of the hot air flow is 150-160 ℃. In this example, the temperature of the hot gas stream is 156.6 ℃.
The feeding device 2 comprises a charging bucket 21, a feeding pipe 22 and a feeding pump 23. The feed pipe 22 is connected to the bucket 21 and the sprayer 12. A feed pump 23 is mounted to the feed delivery pipe 22 for pumping the feed liquid in the bucket to the atomizer for atomizing the feed liquid by the atomizer.
In this embodiment, the number of the material tanks is a plurality of, and the material tanks include a material tank for containing clean water and a material tank for containing material liquid. The plurality of charging buckets are connected to the conveying pipeline through the water/material switching valve.
The temperature sensor 3 is installed in the first powder discharge port 10 and is mainly used for collecting the exhaust air temperature in the first powder discharge port.
The first closed-loop controller 4 is connected to the feed pump 23 and the temperature sensor 3. The first closed-loop controller is used for acquiring the real-time air exhaust temperature of the first powder exhaust port, controlling the feed liquid pumping speed of the feed pump, and correcting the feed liquid pumping speed of the feed pump based on the preset air exhaust temperature, so that the real-time air exhaust temperature meets the preset air exhaust temperature. The feeding pump, the temperature sensor and the first closed-loop controller form a temperature closed-loop control system.
The moisture sensor 5 is installed in the cylinder 11 and is mainly used for collecting the real-time moisture value of the powder in the cylinder.
The second closed-loop controller 6 is connected to the first closed-loop controller 4 and the moisture sensor 5. The second closed-loop controller obtains a real-time moisture value, and based on the preset moisture value range of the powder, the first closed-loop controller adjusts the real-time exhaust temperature value based on the corrected exhaust temperature value range by correcting the exhaust temperature range, so that the real-time moisture value of the powder conforms to the preset moisture value range of the powder in the second closed-loop controller.
The second closed-loop controller, the first closed-loop controller and the moisture sensor form another moisture closed-loop control system, so that the spray drying equipment for controlling the moisture of the powder on line can accurately, intelligently, efficiently and real-timely adjust and monitor the moisture value of the powder on line through the double closed-loop control system.
In the present embodiment, the first closed-loop controller 4 and the second closed-loop controller 6 are pid (performance Integration differentiation) closed-loop controllers, respectively.
A PID controller (proportional-integral-derivative controller) is a common feedback loop component in industrial control applications, consisting of a proportional unit P, an integral unit I and a derivative unit D. The basis of PID control is proportional control; integral control may eliminate steady state errors, but may increase overshoot; differential control can accelerate the response speed of the large inertia system and weaken the overshoot tendency.
The PID closed-loop controller calculates the difference between the set value and the actual value by a method of proportion, integral and differential, and feeds the result back to the frequency converter, so that the frequency converter can more quickly and better integrate the set value with the actual value.
In this embodiment, the spray drying apparatus for online controlling moisture of powder further comprises a cyclone separator 7. Specifically, the cyclone separator 7 is provided with a powder inlet, a second air inlet for introducing cold air flow, and a second powder outlet. The temperature of the cold air flow is 30-40 ℃. In this example, the temperature of the cold gas stream is 35 ℃.
The powder inlet of the cyclone 7 is connected to the first powder outlet 10 via a powder discharge pipe 13. Because the dry powder in the barrel is discharged into the cyclone separator through the powder discharge pipe, the temperature of the dry powder is higher, and the cold air flow is introduced into the cyclone separator through the second air inlet to cool the dry powder with higher temperature.
As a preferred embodiment, the cyclone separator is connected to a plurality of powder collecting cylinders, and the cooled dry powder is transported to the plurality of powder collecting cylinders through pipelines for storage.
In a preferred embodiment, an alarm 8 is connected to the second closed-loop controller 6. And under the condition that the alarm is started, namely after the powder moisture alarm function is started, the second closed-loop controller automatically monitors the real-time moisture value of the powder according to the real preset moisture value range of the powder, and automatically gives an alarm for prompting when the real-time moisture value exceeds the moisture value range of the powder.
In this embodiment, the moisture sensor is an online near-infrared detector, and can directly output the calibrated moisture measurement value of the powder, and is linked with the second closed-loop controller to stably control the moisture value of the produced powder.
The moisture closed loop control system may be manually selectively activated or deactivated. If the moisture closed-loop control system is selected to be started, the moisture closed-loop control system automatically adjusts the set value of the exhaust air temperature according to the real-time moisture value, and meanwhile, the temperature closed-loop control system adjusts the feed liquid pumping speed of the feeding pump according to the set exhaust air temperature set by the moisture closed-loop control system, so that the online double-closed-loop real-time moisture control is realized.
When the exhaust temperature is stable during continuous production, the function of the moisture closed-loop control system can be started manually. If the moisture closed-loop control system is stopped manually, the temperature closed-loop control system is kept started, and a user can modify the set value of the exhaust air temperature by himself. If the user does not modify the set value of the air exhaust temperature after the function of the moisture closed-loop control system is stopped, the air exhaust temperature of the temperature closed-loop control system is kept unchanged according to the set value of the air exhaust temperature output last time before the moisture closed-loop control system is stopped, and the operation is continued.
The second closed-loop controller outputs a lower limit value to an upper limit value of the set value of the exhaust air temperature with a ratio of 0-100%. The upper and lower limit values of the set value of the exhaust air temperature of the second closed-loop controller need to be manually modified through logging in corresponding authority of a human-machine interface (HMI), and if the corresponding authority is not logged in correctly, the upper and lower limit values cannot be modified.
The actual moisture control and regulation effect can be realized by inquiring the historical curve and the related historical data of the powder through the real-time moisture value curve of the powder output by the second closed-loop controller.
The second closed-loop controller is in signal connection with the moisture sensor, and the communication mode of the second closed-loop controller and the moisture sensor is as follows: the physical layer is connected by RJ45 network cables, the communication protocol adopts a general open TCP protocol, the second closed-loop controller side actively receives a 64-bit double-precision floating point water content value, and the second closed-loop controller exchanges high and low bytes of the 64-bit floating point number and converts the high and low bytes into 32-bit floating point numbers which can be operated and controlled in a PLC program of the second closed-loop controller.
The moisture sensor is an online monitoring intelligent sensor, the User Datagram Protocol (UDP) to TCP software of the moisture sensor must be started, and the second closed-loop controller can receive a real-time moisture value, namely an online moisture measurement value. If the service is started, when the external failure of the TCP communication is solved, the moisture measured value of the touch screen of the second closed-loop controller automatically recovers to be received. And the second closed-loop controller automatically closes the automatic moisture regulation function when the TCP communication fails, and cuts off the signal connection with the first closed-loop controller.
The invention provides a powder moisture control method of spray drying equipment for controlling the moisture of powder on line, which comprises the following steps:
s1: the moisture value range of the powder is preset in the second closed-loop controller 6, and the second closed-loop controller 6 converts the moisture value range of the powder into the corresponding exhaust air temperature value of the first powder exhaust port 10 of the barrel 11 and sends the exhaust air temperature value to the outside.
S2: the first closed-loop controller 4 receives the exhaust air temperature value, converts the exhaust air temperature value into the corresponding feed liquid pumping rate of the feed pump 23, and sends the feed liquid pumping rate to the outside.
S3: the feeding pump 23 receives the feed liquid pumping rate, the feed liquid in the material tank 21 is pumped to the sprayer 12 through the feed delivery pipe 22 at the feed liquid pumping rate, the sprayer 12 atomizes the feed liquid, hot air is introduced into the first air inlet of the cylinder 11 to dry the atomized feed liquid into powder, and the powder is discharged out of the cylinder 11 through the first powder discharge port 10.
And the powder is cooled by the cyclone separator and then is conveyed to the powder collecting cylinder for storage.
S4: the temperature sensor 3 collects the real-time exhaust temperature value in the first powder discharging port 10.
S5: the first closed-loop controller 4 obtains a real-time exhaust temperature value, calculates a temperature difference between the real-time exhaust temperature value and the exhaust temperature value, corrects the pumping speed of the feed liquid based on the temperature difference, and sends the feed liquid to the outside, and the feed pump 23 receives the corrected pumping speed of the feed liquid and pumps the feed liquid at the corrected pumping speed of the feed liquid, so that the real-time exhaust temperature value is in accordance with the exhaust temperature value.
S6: after the real-time exhaust temperature value meets the exhaust temperature and the real-time exhaust temperature value is stable, the moisture sensor 5 acquires the real-time moisture value of the powder in the first powder outlet 10.
S7: the second closed-loop controller 6 obtains the real-time moisture value, calculates the moisture difference value between the real-time moisture value and the preset moisture value range of the powder, corrects the exhaust air temperature value based on the moisture difference value and sends the exhaust air temperature value to the outside.
When the second closed-loop controller 6 cannot acquire the real-time moisture value (i.e., the second closed-loop controller fails to communicate with the moisture sensor), the second closed-loop controller 6 is disconnected from the first closed-loop controller 4, and the feed pump 23 pumps the feed liquid at the last feed liquid pumping rate received.
The second closed-loop controller 6 is connected with an alarm 8, and when the real-time moisture value exceeds the moisture value range of the powder, the second closed-loop controller 6 starts the alarm 8 to give an alarm.
S8: the first closed-loop controller 4 receives the corrected exhaust air temperature value and corrects the feed liquid pumping speed based on the corrected exhaust air temperature value, and the feed pump 23 pumps the feed liquid at the corrected feed liquid pumping speed, so that the real-time moisture value meets the preset powder moisture value range.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the invention is to be defined by the scope of the appended claims.
Claims (9)
1. A spray drying equipment for controlling the moisture of powder on line is characterized by comprising:
the drying device comprises a cylinder body, wherein a sprayer is arranged in the cylinder body, and the cylinder body is provided with a feeding hole, a first air inlet for leading hot air into the cylinder body and a first powder discharging hole;
the feeding device comprises a material tank, a material conveying pipe connected with the material tank and the sprayer, and a feeding pump arranged on the material conveying pipe;
the temperature sensor is arranged in the first powder discharge port;
a first closed-loop controller connected to the feed pump and the temperature sensor;
a moisture sensor mounted in the barrel; and
and the second closed-loop controller is connected to the first closed-loop controller and the moisture sensor.
2. The spray drying equipment for controlling powder moisture on line according to claim 1, wherein the first closed-loop controller and the second closed-loop controller are respectively PID controllers.
3. The spray drying equipment for controlling the moisture of the powder body on line according to claim 1, further comprising a cyclone separator, wherein the cyclone separator is provided with a powder inlet, a second air inlet for introducing cold air flow and a second powder outlet, and the powder inlet is connected to the first powder outlet through a powder outlet pipe.
4. The spray drying equipment for controlling the moisture of powder on line according to claim 3, wherein the temperature of the cold air flow is 30-40 ℃.
5. The spray drying equipment for controlling the moisture of powder on line according to claim 1, wherein the temperature of the hot air flow is 150-160 ℃.
6. The spray drying equipment for controlling the moisture of powder on line according to claim 1, wherein the second closed-loop controller is connected with an alarm.
7. The powder moisture control method of the spray drying equipment for controlling the powder moisture on line according to any one of claims 1 to 6, characterized by comprising the following steps:
presetting a powder moisture value range in a second closed-loop controller, converting the powder moisture value range into an exhaust air temperature value of a first powder exhaust port of a corresponding cylinder by the second closed-loop controller, and sending the exhaust air temperature value to the outside;
the first closed-loop controller receives the air exhaust temperature value, converts the air exhaust temperature value into a corresponding feed liquid pumping speed of the feed pump based on the air exhaust temperature value and sends the feed liquid pumping speed to the outside;
the feeding pump receives the feed liquid pumping speed, the feed liquid in the material tank is pumped to the sprayer through the feed delivery pipe at the feed liquid pumping speed, the sprayer atomizes the feed liquid, the first air inlet of the cylinder introduces hot air flow to dry the atomized feed liquid into powder, and the powder is discharged out of the cylinder through the first powder discharge port;
the temperature sensor collects a real-time air exhaust temperature value in the first powder exhaust port;
the first closed-loop controller obtains the real-time exhaust temperature value, calculates and obtains a temperature difference value between the real-time exhaust temperature value and the exhaust temperature value, corrects the feed liquid pumping rate based on the temperature difference value and sends the feed liquid to the outside, and the feed pump receives the corrected feed liquid pumping rate and pumps the feed liquid at the corrected feed liquid pumping rate, so that the real-time exhaust temperature value accords with the exhaust temperature value;
after the real-time exhaust temperature value accords with the exhaust temperature and the real-time exhaust temperature value is stable, a moisture sensor acquires the real-time moisture value of the powder in the first powder outlet;
the second closed-loop controller obtains the real-time moisture value, calculates and obtains a moisture difference value between the real-time moisture value and a preset moisture value range of the powder, corrects the exhaust air temperature value based on the moisture difference value and sends the exhaust air temperature value to the outside;
the first closed-loop controller receives the corrected exhaust temperature value and corrects the feed liquid pumping speed based on the corrected exhaust temperature value, and the feed pump pumps the feed liquid at the corrected feed liquid pumping speed, so that the real-time moisture value accords with a preset powder moisture value range.
8. The powder moisture control method of claim 7, wherein when the second closed-loop controller fails to obtain the real-time moisture value, the second closed-loop controller is disconnected from the first closed-loop controller, and the feed pump pumps the feed liquid at the last feed liquid pumping rate.
9. The powder moisture control method of the spray drying equipment according to claim 7, wherein the second closed-loop controller is connected with an alarm, and when the step of acquiring the real-time moisture value by the second closed-loop controller is performed, the second closed-loop controller starts the alarm to give an alarm when the real-time moisture value exceeds the range of the powder moisture value.
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| CN202010921460.3A CN112044106A (en) | 2020-09-04 | 2020-09-04 | Spray drying equipment for online controlling powder moisture and powder moisture control method |
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| CN202010921460.3A CN112044106A (en) | 2020-09-04 | 2020-09-04 | Spray drying equipment for online controlling powder moisture and powder moisture control method |
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