How to deal with the solvent tail gas in the ink production workshop? The collection and configuration of the dispersion grinding and blending filling link
Release date: 2026-10-21
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How to control the solvent exhaust in the ink production workshop? The idea is three steps: first, classify the emission sources according to the links-disperse the respiratory emission of grinding equipment, open volatilization of blending and filling, and intermittent emission of solvent storage and transportation and cylinder washing; Then collect them separately according to the point characteristics, and make local enclosure at the breathing port of the equipment and the open operation point. Finally, the treatment route based on condensation recovery is selected according to the composition and concentration, the solvent for ink is mainly ester ketone alcohol, the component is relatively single, and the reuse value of condensate is obvious. The advantage of ink production is that the emission point is concentrated, the batch operation is controllable, and the treatment and recovery can be solved together.
Where does the exhaust gas from the ink workshop come from?
The connecting material resin of ink needs to be diluted and dispersed by solvent. When the sand mill, stirring tank and high-speed dispersing machine are tightly stirred, the positive and negative pressure breathing in the equipment will bring out the solvent vapor, which is a continuous emission source. Volatility in open operation of dilution, color mixing and filling fluctuates with batches; Washing tanks and tanks are cleaned with solvent, with short-term high concentration; Respiratory emissions from solvent warehouse and intermediate tank are concentrated in storage area. The air volume and concentration of the four types of points vary greatly and are accounted for separately when configured.
How to collect the dispersion grinding link
The sand mill and the mixing tank lead out the collection branch pipe at the top breathing port or feed port, and the shaft seal of the closed equipment and the manhole are partially enclosed to escape; the feeding operation is replaced by closed conveying or feeding port with enclosure to reduce the opening time. The air volume emitted by the equipment breathing is not large but the concentration is considerable, and it is collected into the collection main pipe after separate accounting, and the processing device is shared with other points. The emission characteristics and configuration of each link are shown in the table below:
| link | Emission characteristics | Collection and processing methods |
|---|---|---|
| Dispersion grinding equipment | Closed stirred breath discharge, higher concentration | Breathing port closed inlet into main |
| Blending and filling | Open volatile, fluctuating with batch | Local enclosure plus directional exhaust |
| wash tank wash | Intermittent short, high concentration | Overall enclosure and ventilation in cleaning area |
| Solvent reservoir and intermediate tank | normal temperature breathing discharge | Breathing tube collection and warehouse ventilation |
How to collect the filling and cleaning links
The mixing tank and the filling mouth are covered with semi-closed cover and directional exhaust, and the escape of the gap between the filling mouth and the barrel mouth is controlled by the air speed of the cover surface. The washing tank area is surrounded as a whole, and the cleaning operation is concentrated in a fixed station. The ventilation and cleaning interlock start and stop. After the low concentration branch is merged into the main pipe, it is merged into the condensation section or is additionally equipped with an adsorption unit according to the concentration. The air exchange volume is approved according to the space and solvent turnover, and excessive large air volume dilution of the whole room is not done.
How should condensation recovery be configured?
The solvent components for ink are mainly ester ketone alcohols, and the condensate recovered by condensation has high reuse value: the front stage precooling cools the tail gas to cool and dehumidify, and the rear stage cryogenic condenses most of the solvent vapor, and the cold quantity is recovered between the two stages; The condensate is used for thinning ingredients after component and moisture verification. Batches mixed with impurities are sent to refining units or entrusted for disposal. The ledger registers the recovery amount and destination according to batches. In the case of batch production, the processing device is configured according to the batch peak value, and the batch gap is maintained with a buffer.
How to promote the implementation of transformation
- On-site survey, confirm emission source, concentration and air volume point by point, and verify the working conditions of sand mill and mixing tank;
- According to the point collection plan: equipment suction pipe, enclosure exhaust and tank washing area collection one by one;
- Approve the concentration monitoring and interlocking scheme, and confirm the safety entry before the recovery entry;
- After construction and installation, adjust the balance of air volume and verify the collection effect point by point;
- After putting into operation, the discharge port shall be inspected periodically, and the condensate shall be tested in batches and checked for reuse.
Frequently Asked Questions
Will the breathing pipe of the sand mill affect the operation of the equipment?
The diameter and resistance of the lead pipe shall be approved according to the breathing volume of the equipment, and the mixing and grinding conditions shall not be affected when the configuration is reasonable. During the debugging stage, the internal pressure of the equipment and the smoothness of feeding shall be observed, and the pipe diameter shall be adjusted after negative pressure suction or pressure suppression occurs.
Can the recovered solvent be directly returned to the ink?
Condensate can be used in the thinning process after component and moisture verification. Batches mixed with resin and pigment will be sent to the refining unit for treatment and then determined, subject to the measured data and ingredient requirements.
Does the workshop batch gap exhaust still need to be opened?
The collection branch and equipment operation interlock start and stop, and the processing device and the main pipe can be kept in operation; The ventilation of the whole room shall be approved according to the solvent retention, and no invalid long-open large air volume shall be made, taking into account the energy consumption and stable working conditions.
What supporting services does WoHong offer?
Luoyang Wo Hong Petrochemical Equipment Co., Ltd. provides design, manufacture, installation and commissioning services for waste gas treatment and solvent recovery devices in ink production workshops. Welcome to contact and exchange.
This article is organized by Luoyang wohong petrochemical equipment co., ltd. if you need to evaluate the waste gas treatment in the ink workshop or conduct on-site investigation, please contact and exchange.
