JPH01236902A - Automation process in operation of spray dryer - Google Patents

Abstract

PURPOSE:To automate operations of a spray dryer, by effectively separating functions of a personal computer UK and a programmable controller PC, monitoring operations of devices by means of PC and temperature conditions etc. by means of UK in each module. CONSTITUTION:A personal computer (hereinafter referred to as UK) and a programmable controller (referred to as PC) are combined with each other to conduct an operation control and operation-state control. And operations from starting to stopping of devices are classified into each of modules, i.e. preset means, air purge means, burner ignition means, heat up means, spray drying means, and cool down means, following which starting and termination of each module is judged by means of PC or UK from characteristics of operations and manipulated variables of constituent devices to operate them automatically. That is, operation of each module device is monitored by PC, while monitoring of temperature conditions and flow rate operation is conducted by UK. As a result, spray drying can be operated by automation.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a method for automating a series of spray drying operations using a component automatic monitoring system that effectively combines a personal computer and a programmable controller. It is something.

(Prior art) Conventionally, powder products have been obtained by atomizing various stock solutions to increase the surface area per unit mass, and then injecting the powder into a high-temperature air stream to dry the stock solution in seconds. Using personal computer software that can automatically set operating conditions by simply obtaining the minimum data to be filed for each stock solution and inputting the processing amount and processing temperature, equipment operation and operating status can be controlled using a personal computer and a programmable controller. The present inventor has developed a spray drying device that performs this process.

(Problems to be Solved by the Invention) Therefore, this invention divides the operation of the spray drying apparatus from start to stop into six modules based on the operation and operation amount characteristics of the component equipment, and the start and end of each module is programmable. The controller (PC) or personal computer (UK) makes decisions and automatically operates the component equipment.
The present invention provides a method of automating spray drying operation in which a PC monitors device operation in each module, and a FC performs temperature condition monitoring and flow rate control, thereby effectively sharing functions.

(Structure of the Invention) Hereinafter, in explaining one embodiment of the present invention with reference to the drawings, a signal system for performing these functions is shown in FIG. The conceptual flow of automation is shown in Figure 2. It is a spray drying device that sprays a stock solution in a high-temperature tank and dries it into powder. (1) is a drying oven, and (2) is a drying oven. (3) is a hot air generating furnace that blows hot air into the drying oven (1), (4) is a raw solution heater that warms the raw solution, and (5) is a tank that supplies the raw solution to be sprayed. This is a powder collection device that spray-dries the raw solution and collects the powder that has become a product. (5a) is a collection container, and (6) is an exhaust heat recovery device.

Next, the details of these operations will be described according to Fig. 1. ■ Preset means Manually enter the desired operating conditions (processing amount IQL, processing temperature IATZ), and set the corresponding atomization conditions (raw solution injection pressure P R
SL, atomization air pressure P RS A, disc rotation speed N
DISK) is calculated and displayed on the CRT. Additionally, the drying operating conditions (hot air volume WA, hot air inlet temperature ATI) are calculated and displayed. Drying operating conditions are automatically set by UK in the spray drying module.

■When Air Purge J-Ten 1 presses the start button on the control panel, P
C is the main blower (Ml) and burner blower (M
2) and air purges the inside of the hot air generating furnace (3) for about 1 minute.

■Burner ignition means PC ignites the banner ignition and opens the pilot burner solenoid valve. Fire detector (F.

After confirming pilot ignition at ), open the main burner solenoid valve and perform burner ignition operation. It also sends the ignition signal to the UK.

■The heat-up means tJK receives the burner ignition signal from the PC and controls the heat amplifier temperature using the hot air inlet temperature controller (TEC/AT 1).
). As a result, the temperature controller automatically controls the burner combustion amount so that the set temperature is achieved. When the drying oven wall temperature (CT) and the hot air outlet temperature (AT2) become higher than the heat-up target temperature, UK detects this and instructs to complete the drying oven heat-up and start the stock solution heat-up.

When the PC receives the signal from tJK, it starts the stock solution pump (M3) and preheats the stock solution if the stock solution temperature ("T'L") is below the set value.

(2) The spray drying means UK outputs the drying operation conditions calculated by the preset module to each actuator. First, the set value (AT L ) is output to the hot air inlet temperature controller, the pulp temperature is output to the hot air control valve and the stock solution control valve, and the actual temperature (AT 1 ) is the set temperature (AT 1 ).
When the condition setting is completed, a condition setting completion signal is sent to the PC.

The PC opens the stock solution stop valve and starts the air plumer (device for blowing off particles adhering to the furnace wall) and rotary valve.

Hot air temperature at each position in UK during spray drying (ATL to AT6)
and the weight of the collected product (WPT), the desired treatment temperature (AT2), and the collection efficiency (ηt).

Evaluate the thermal efficiency (η) and if the actual value differs, perform a heat balance calculation and reset the drying operating conditions.

On the other hand, when the collection container (5a) is full at the end of the product, the PC receives a signal from the powder level sensor (LV3), stops the rotary valve, and issues an alarm and warning light to request the driver to collect the product powder. .

To end spray drying, the driver presses the end button on the control panel.

- The cool-down means UK fully opens the hot air control valve, and the - side PC extinguishes the burner and continues to operate the blower for about 10 minutes to cool the device, and then stops it. Further, tJK displays the drying operation data on the CRT and ends the control.

The functions of the CPU in the personal computer are: (a) Determining operating conditions (determining the operation amount related to spray drying by referring to a disk file) and setting; (b) Confirming the start/end of the operating operation module. Instructions (transfers air purge, burner ignition, heat amplifier, spray drying, cool down, and spray drying equipment operation module signals to and from the programmable controller), (C) Error display of component equipment (receives abnormal signals from the programmable controller) (d) Operation data display (hot air inlet, outlet temperature, hot air volume,
(e) Sensing the operating status and resetting operating conditions for optimization (displaying spray drying operation data such as the amount of product collected on a CRT) (b) Starting and stopping equipment components, (b) Confirming the start and end of operation modules and sending signals, (c) Operating, detecting and taking actions on equipment components and outputting signals to the computer and control panel. There are 3 items.

(Effects of the Invention) According to the present invention, by effectively sharing functions between a personal computer and a programmable controller, the personal computer or programmable controller determines the start and end of each module and automatically operates the component devices. A programmable controller monitors device operation in each module, and a FC performs temperature condition monitoring and flow rate control.By effectively sharing functions, it is possible to automate spray drying operations, which is extremely beneficial.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an operating method according to an embodiment of the present invention, and FIG. 2 is a system diagram showing the overall configuration of a spray drying apparatus according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Drying oven 1.2... Raw solution tank, 3... Hot air generation furnace, 4... Raw solution heater, 5... Powder collection device, 5a... Collection container, 6.・・Exhaust heat recovery device,

Claims (1)

[Claims] When operating a spray drying device that uses a combination of a personal computer and a programmable controller to control operation and operating conditions, the operations from start to stop of the device are controlled by presetting means, air purge means, burner ignition means, heat up means, and spray drying. The programmable controller (PC) or personal computer (UK) determines the start and end of each module based on the operation and operation amount characteristics of the component devices, and automatically operates the component devices. A method for automating operation of a spray drying apparatus, characterized in that equipment operation in each module is monitored by a PC, and temperature condition monitoring and flow rate operation are performed by a FC.