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Pulp digester overview

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pulp digester


In the paper pulp production process, pulp cooking equipment plays a crucial role as a critical process equipment used to convert fiber raw materials such as wood, reed, sugarcane bagasse, bamoo into pulp. When it comes to pulp cooking equipment in paper pulp production, continuous tubular digesters, vertical pulp digesters, and rotary digesters are often mentioned.

Type of cooking equipment:

Continuous Digesters:

Working principle: A continuous digester is a high-pressure container, usually vertical, used for continuous heating and processing of wood fibers. Wood raw materials are heated inside the equipment and exposed to high temperature and high pressure steam for chemical decomposition and bleaching.

Features: The continuous digester can achieve continuous production and is suitable for large-scale pulp production lines, capable of handling large amounts of wood raw materials.

continuous pulp digester

Pulp Digesters:

Working principle: This device places wood in a rotating container and injects steam to steam and cook the wood fibers. The wood rotates continuously inside the container to ensure uniform heating.

Features: The pulp digester is suitable for small-scale production lines, with slightly lower processing capacity than the continuous digester, but easy to operate and maintain.

pulp digester

Technical advantages of pulp digester

Efficient cooking and bleaching: Cooking equipment can effectively convert wood raw materials into pulp, achieve fiber bleaching and decomposition, and ensure high-quality pulp production.

Temperature and pressure control: The equipment has an accurate temperature and pressure control system to ensure appropriate heating treatment of wood fibers during the cooking process, avoiding excessive heating and fiber damage.

Chemical treatment: Cooking equipment usually uses chemical agents to assist in bleaching and decomposing wood during the cooking process, improving the whiteness and quality of the pulp.

pulp digester processing

Working principle of pulp digester

  1. Wood loading: Loading wood raw materials into cooking equipment may require prior cutting or crushing to ensure uniform heating.
  2. Steam heating: The equipment heats wood raw materials by injecting high-temperature and high-pressure steam, exposing them to this high-temperature and high-pressure environment.
  3. Chemical treatment and bleaching: In high-temperature and high-pressure environments, wood raw materials undergo chemical decomposition and bleaching treatment to separate wood fibers and remove impurities.
  4. Pulp discharge: The processed wood fibers are converted into pulp and discharged from the cooking equipment before entering the subsequent pulp production process.

Role in pulp production line

Pulp digesteris a key link in the pulp production line, used for processing and converting wood fiber raw materials to ensure high-quality pulp production.

It is responsible for the bleaching and decomposition of wood fibers during the process of converting wood into pulp, providing high-quality raw materials for subsequent pulp production steps.

The performance and efficiency of pulp digester directly affect the final quality and characteristics of paper.

paper pulping process

Market analytics of pulp digester

In recent years, the pulp equipment market has been influenced by various factors, showing some obvious trends and characteristics. The following is the trend and analysis information of the pulp equipment market in recent years:

  1. Technological innovation and sustainable development:

Environmental Protection and Sustainability: Pulp equipment manufacturers are increasingly focusing on environmental protection and sustainable development. They are committed to developing and using more energy-efficient and environmentally friendly technologies and equipment to reduce energy consumption and waste emissions.

Digitization and Intelligence: The industry is continuously promoting digital transformation and intelligent production. Pulp equipment manufacturers adopt the Internet of Things (IoT), big data analysis, and automation systems to improve production efficiency and quality control.

  1. Regional market changes and demand trends:

Market growth in the Asia Pacific region: The pulp equipment market in the Asia Pacific region continues to grow, benefiting from the rapidly developing pulp and paper industry and growing demand.

Increased demand in emerging markets: The demand for pulp equipment in these regions has increased, leading to market expansion of pulp equipment due to the growing demand for packaging, toilet paper, writing paper, and other materials.

  1. Industry integration and competitive landscape:

Intense market competition: The pulp equipment industry is fiercely competitive, with major manufacturers engaged in fierce competition in terms of technological innovation, product quality, and services, striving for market share.

Industry integration and mergers and acquisitions: Some companies expand their business scale, increase market share and competitiveness, and form larger enterprise groups through mergers and acquisitions or other means.

  1. Impact of global economy and raw material prices:

Economic fluctuation impact: Global economic fluctuations and tense trade relations may affect the pulp equipment market, leading to demand fluctuations and investment uncertainty.

Fluctuations in raw material prices: The price fluctuations of wood and other pulp production raw materials can affect the market demand and price trends of pulp equipment.

  1. Impact of the epidemic:

COVID-19 Impact: The COVID-19 pandemic has had a certain degree of impact on the pulp equipment market, leading to supply chain disruptions, decreased demand, and delayed investment.

  1. Changes in environmental regulations:

Strengthening environmental regulations: The continuous tightening of environmental regulations worldwide has prompted enterprises to pay more attention to environmental protection, energy conservation, and emission reduction, which directly affects the technology and development direction of pulp equipment.