TECO Automatic Freeness Measuring System DRAINAC FX
Features
- Freeness is indicated in POD by micro sequencer control (DC4 - 20mA for DRAINAC III)
- Short measuring time (20 - 40 seconds)
- Little affect from process line by correcting consistency, temperature and differential pressure. (correcting temperature and differential pressure for DRAINAC III)
- Simple design without moving parts provides easy maintenance.
- In-line and on-line installations available
- Easy installation and lower cost
Freeness Control System
DFC Delta Freeness Control (Patented)
Features
- Original control system provides PID control by quick response to the changes of stock, freeness, consistency and flow rate.
- Increasing the number of measuring signal by 6 - 10 times reduces time-lag by using DRAINAC.
- Correct the change of temperature, consistency, pressure and flow rate
- Freeness control with no affect of refiner disk plate timely change
- Only touching a panel for grade change
- Minimize converting cost from the existing equipment
- Lower cost by simple design and software
After controlling by DFC
300 cc:± 8cc 370 cc:±5 cc
300 cc:± 8cc 370 cc:±5 cc
Before controlling by DFC
300 cc:±50 cc
300 cc:±50 cc
- Pulp: recycled corrugated paper board
- Freeness at inlet: 400 - 500 cc
- Freeness at outlet: 300 - 400 cc
- Measuring range: 250 - 500 cc
- Refiner: 20" Double-disk Refiner (Manual hydraulic clearance control)
- Refiner motor load: - 200 KW
Freeness Indicator Measuring Process
-
Starting
Pressure inside detector tube is a little higher than that of stock line.
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Sampling
Pressure inside detector tube decreases a little than that of stock line. Stock rising to screen creates pulp pad. Only filtrate enters detector tube.
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Measuring
2 pieces of thermister inside detector tube, which detects the level of filtrate, measures time for filtrate rising from bottom to top.
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Blow-down
After reaching top of thermister, filtrate returns to stock line according to higher pressure inside detector tube than that of stock line.
-
Cleaning
Detector tube and Screen are cleaned automatically when discharging for the next sampling.
| Type | Control | DFC (Delta Freeness Control) |
|---|---|---|
| DRAINAC FX (Digital) | ||
| DRAINAC Ⅲ(Analog) | ||
| Detector | In-line Type (Standard, Low-Pressure, Non-Pressure) | |
| Open Type (Non-Pressure) | ||
| Processing Elements | Stock Velocity | Above 3% of Consistency 0.3 - 1.2m/sec |
| Below 3% of Consistency 0.3 - 2.1m/sec | ||
| Stock-line Pressure | Standard: 0.07 - 0.4MPa | |
| Low Pressure: 0 - 0.1MPa | ||
| Non-Pressure: 0 MPa | ||
| Stock Consistency | Within ± 10％ of Nominal Consistency | |
| Nominal Consistency: 0.5 - 6.0％ | ||
| Stock Temperature | Below 75°C（Within ± 15°C） | |
| Freeness | Measuring Range: 0 - 800 cc C.S.F. | |
| Min. Span: 100 cc C.S.F.（400 - 500 cc C.S.F.） | ||
| Max. Span: 300 cc C.S.F.（100 - 400 cc C.S.F.） | ||
| Stock-line Pipe Diameter | 3" - | |
| Operating Conditions | Power | AC100V/110V 50/60Hz Single-phase |
| Air Pressure | Max. 0.7MPa（Min. Stock-line Pressure + 0.1MPa - ） | |
| Water Pressure | Max. 0.6MPa（Min. Stock-line Pressure + 0.2MPa - ） |