The electric heating digester applies direct electrical heating to a rotating pressure vessel. The cylindrical vessel rotates at approximately 1 rpm, promoting intimate contact between the chips and the liquor, which allows for a low liquor-to-wood ratio and reduced cooking time. An intelligent temperature controller with a brushless signal system ensures reliable, maintenance-free operation. Pre-programmed cooking profiles can be stored and recalled, automating the entire cycle. Beyond pulp cooking, it can serve as a general-purpose high-pressure reactor or steam generator for other laboratory equipment.

Key Features 
Rotating Vessel for Uniform Cooking The vessel rotates at ~1 rpm, continuously agitating the mixture for homogeneous concentration, temperature, and resulting pulp quality.
Brushless Control System Uses non-contact signal transmission instead of carbon brushes, eliminating sparking, contact failure, and temperature measurement drift for robust safety.
Precision Intelligent Temperature Control Measuring accuracy ±0.1°C, control accuracy ±3°C. Multi-step profiles can be programmed and stored for one-touch repeatability.
304 Stainless Steel Construction The vessel and all product-contact parts are made of 304 stainless steel, resisting acid and alkali corrosion and ensuring long service life.
Efficient Heating and Insulation 4.5 kW heating power delivers rapid heat-up. A high-quality insulation layer minimizes heat loss and keeps the external surface cool and safe.
Multiple Safety Protections Over-temperature, over-pressure, and safety interlock devices protect both the operator and the apparatus under high-pressure conditions.
Low-Noise Direct Drive A geared motor directly rotates the vessel, offering compact structure, smooth transmission, low noise, and minimal vibration.
Versatile Application Suitable for pulping of wood and non-wood fibers, chemical reactions, oxygen bleaching, hydrothermal treatment, and steam supply experiments.

Main Technical Specifications

FAQ 
1. What types of raw materials can be cooked in this digester?
It is suitable for wood chips and non-wood fibers such as bamboo, wheat straw, rice straw, bagasse, and reed. By adjusting the cooking liquor composition and profile, different degrees of delignification can be achieved.

2. What is the advantage of the brushless system over traditional carbon brushes?
Carbon brushes wear, accumulate dust, and cause poor contact, sparking, and inaccurate temperature readings. The brushless technology uses contactless signal transmission, eradicating these failures and making the unit virtually maintenance-free.

3. How do I clean the vessel after cooking?
After cooling and depressurizing, open the feed port and rinse the interior with water and a soft brush. The 304 stainless steel surface is corrosion-resistant and easy to clean. Avoid hard scrapers.

4. Can I save multiple cooking profiles?
Yes. The intelligent controller supports multi-step programming (ramp rate, target temperature, holding time) and can store multiple recipes. Simply recall a recipe to replicate the exact cooking conditions across batches.

5. What if the heating rate becomes noticeably slower?
Check whether the supply voltage matches the rated 380 V. If the voltage is correct, the heating elements may have accumulated scale or aged. Contact our service team for testing or replacement.

6. Can it be used for applications other than pulp cooking?
Absolutely. It can serve as a pressurized reactor for high-temperature chemical synthesis, oxygen bleaching, hydrothermal treatment, or as a steam generator for other lab equipment, provided the medium is compatible with stainless steel and the operating pressure is within 8 Kg/cm².

After-Sales Service 
Established in 2007 and with nearly two decades of experience, Shandong Annimet Instrument Co., Ltd. is a professional manufacturer integrating R&D, production, and sales of laboratory testing and sample preparation equipment. Quality is our foundation. We are your bridge from concept to reality. We deliver more than just instruments — we deliver confidence. This Electric Heating Digester comes with a 12-month warranty and lifetime technical support. Our professional team offers 24/7 service response, free installation guidance, operation training, and pulping process consultation. For any inquiries, please contact our customer service team; we are dedicated to providing comprehensive pre-sales, in-sales, and after-sales support. Hotline: 400-9933-057, Email: anmt_test@126.com.