The quality control system in the papermaking production process is an important means and measure to improve product quality, save raw materials, reduce costs, improve automation and the economic benefits of enterprises. BN QCS3200 quantitative / moisture control system is a subsystem in paper mill DCS system, which is mainly used for quantitative moisture control in papermaking section. It is mainly composed of a computer, a scanning frame and sensors, and an actuator. It is a comprehensive application of computer technology, nuclear testing technology, applied optics, and precision machinery manufacturing technology in the paper industry.

Smart3200 intelligent scanning rack

1. Four alloy steel rails, with closed cavity structure, solid structure, and high mechanical precision

Mechanical accuracy:

Vertical: ≤ + 0.02mm

Level: ≤ + 0.2mm

Movement: ≤ + 0.2mm

2. AC variable frequency drive, fast scanning speed, 50-400mm / sec

3. Probe air-gap constant temperature control to eliminate the influence of environment on sensor measurement

4. Fast Ethernet optical fiber communication interface, fast communication speed, strong anti-interference ability

5. Z-direction sensor for detection and compensation of guide rail accuracy

6. The precise positioning of the probe (0.75mm) to create conditions for quantitative control of the thickness of the banner

7. With an independent operation interface, even if the system control station fails, the Siemens operation interface of the scanning frame control station can still achieve the horizontal and vertical detection and display of quantitative moisture. Technical specifications

Dosing sensor

1. BNQCS3200 quantitative moisture control system quantitative sensor

2. Imported Kr85 radiation source; with air gap temperature detection and compensation function ;

3. With air-gap hot air constant temperature function and anti-condensation function ;

4. Powerful combination correction function, through comparison of the internal standard sample and the background sample, the possible drift error of more than 98% can be eliminated!

Moisture sensor

1. BNQCS3200 Moisture Sensor for Quantitative Moisture Control System

2. SY-WMT microwave moisture meter consists of upper and lower probes as a resonant cavity. When the paper passes between the upper and lower probes, the paper as a medium due to the presence of moisture changes the Q value of the oscillating circuit formed by the resonant cavity. The rate is directly proportional! After signal processing, the digital moisture meter sends out a digital moisture signal.

3. Because the resonance frequency of the microwave meter is on the order of GHz, its data processing and transmission rate are also above the order of MHZ, and it is in a completely continuous working mode. Therefore, the speed of the microwave moisture meter is highly adaptable and can be adapted to the speed of more than one kilometer. Paper machine, this is unmatched by an infrared moisture meter.

System Features

A. Vertical and horizontal separation technology-to achieve true banner display. Some products seem to display banner curves in real-time, but they do not know that the banner curve displayed at this time contains a lot of vertical information!

B. A plurality of control algorithms - fully adapt to a variety of machine conditions ( depending on the paper machine objects may have estimated, decoupling, fuzzy, neuronal and feedforward algorithms );

C. Multiple software control schemes —ensure that the quantitative moisture closed-loop problem is solved in various situations; such as flow control, valve position control, incremental control, position control

D. Complete historical records-easy to analyze various quality conditions ;

E. Report configuration function-sufficient to meet the various management needs of users, and can configure various types of roll, shift, and daily reports according to user needs ;

F. Standard OPC interface-provides OPC interface for quantitative moisture banner data and vertical data, which is convenient for the connection with other systems ;

G. Complete user operation records—easy for users to operate and manage the system ;

H. Open configuration function-convenient for users to expand, add loops, and change control methods. 

Technical performance

1. Excellent control quality

2. 100% double-closed loop decoupling fully automatic control.

3. High system reliability

4. The normal operating rate of the system is more than 95%; 80% of the components and devices in the system are imported or assembled products ;

5. Short commissioning cycle and long service period.

Excellent performance-price ratio

1. System performance reaches the level of foreign products, and the price is only less than 1/3 of similar imported products; the cost of after-sales service is unmatched by other similar products ;

2. System integrity is good

3. The system includes all detection components, actuators, and control workstations, including the pulp concentration control subsystem, the net dry pulp control subsystem, the paper drying process control subsystem, the vehicle speed detection feedback subsystem, and the quantitative moisture scanning detection control subsystem, breaks during process control subsystem ;

4. System adaptability to working conditions 5.

5. The BN QCS3000 system is developed and honed in the domestic environment. It is particularly suitable for our national conditions! Usually, it works in a large closed-loop full-automatic state. Under the action of the paper machine condition optimization software, the machine enters more and more stable. Benign state.