In the paper industry, the adoption of liquid ring vacuum pumps has proven essential for optimizing production processes, reducing costs, and improving paper quality. These pumps are widely used in vacuum systems for papermaking and dewatering applications. Below are some key applications:

Liquid Ring Vacuum Pumps in the Paper Industry

1. Black Liquor Evaporation

In pulp mills, black liquor evaporators concentrate the black liquor produced during the pulp washing process. This process facilitates the recovery of chemical agents in recovery boilers, enabling their reuse in pulp production.

2. Brown Stock Washers

Before bleaching or further processing, brown stock washers remove pulp chemicals (“black liquor”) from raw materials. These washers typically feature horizontal rotary drum filters where vacuum inside the drum allows the raw material to adhere to the drum surface and effectively separates black liquor from the pulp.

3. Lime Slurry Filters

In pulp mills, lime slurry filters recover lime during the white liquor clarification process. Like the brown stock washer, the lime slurry filter also employs a rotary drum mechanism. The vacuum inside the drum creates a lime cake on the drum surface, which is scraped off and reused in the process.

4. Precipitator Filters

Precipitator filters are used to remove non-combustible particles, unburned carbon, iron compounds, and furnace debris from the green liquor. These filters, utilizing vacuum technology, are instrumental in ensuring the quality of the recovery process.

5. Vacuum Dehydrators

Vacuum dehydrators are deployed during the raw material preparation phase to increase pulp concentration. These rotary drum filters use vacuum pressure to remove water from the pulp and enhance its consistency.

6. Raw Material and White Water Degassing Systems

Degassing systems remove entrained air from raw materials or diluted white water before they enter the headbox. This process prevents air bubbles in the pulp, which can cause pinholes in the paper, ultimately affecting its printability and overall quality.

7. Headbox Compressors and Vacuum Pumps

These pumps are used in the headbox to control the discharge rate of pulp by creating pressure or vacuum above the pulp level. This ensures precise flow regulation for consistent papermaking.

8. Suction Boxes

Suction boxes are stationary devices positioned in the forming section of the paper machine. They remove water directly from the pulp. Since suction boxes handle large volumes of water, pre-separators are installed to protect the vacuum pump.

9. Couch Rolls

Located at the end of the forming section, couch rolls are critical for water removal. These rolls influence dewatering efficiency in the press section and steam consumption in the drying section.

10. Transfer and Pickup Rolls

Transfer rolls lift the paper from the forming fabric and guide it to the press section. Pickup rolls transfer paper between fabrics in the press section. These rolls do not contribute significantly to dewatering but assist in transferring paper efficiently.

11. Vacuum Pressing

Vacuum pressing mechanically removes water from the paper in the press section. This process utilizes vacuum-assisted rolls to dewater paper efficiently while simultaneously transporting it to the drying section.

12. Felt Suction Boxes

Felt suction boxes clean and dewater press fabrics used in the press section. They remove water, chemicals, and contaminants, ensuring the felt is ready for reuse in the next cycle. Pre-separation systems are crucial to prevent water from entering the vacuum pump.

13. Anti-Blow Boxes

Anti-blow boxes are stationary devices that create upstream vacuum zones in open press sections to stabilize the paper web, preventing breakage or folds during high-speed operations.

Liquid ring vacuum pumps play an integral role in various processes within the paper industry, from pulp preparation to finished paper production. By enhancing dewatering, improving product quality, and ensuring efficient material recovery, these systems significantly contribute to cost reduction and sustainability in the papermaking process.

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