Digesters TRIZ Cases

Cross-stage data sharing links woodyard, fiberline, and later stages to stabilize pulp quality and balance capacity in chemical pulp production.

A rotatable disc and reduced-bore adaptor center hot biomass discharge from pressurized containers to cut wear, plugging, and steam use.

Standardized supply and process modules speed fiber plant commissioning while maintaining consistent production-quality pulp.

Controlled peroxide delignification removes lignin from biomass at ambient conditions, cutting energy use and chemical waste while preserving cellulose.

Measured paper piece flow is fed back to tube and motor control, reducing target deviation in recycled sheet production.

In pulping operations, real-time tail measurements adjust puller speed and rider-roll pressure to limit slippage, breakage, and clogging.

Flow measurements in a pulp feeder enable dynamic annular-gap adjustment to limit pressure loss and metal contact risk.

Segmented multi-part rotating screw design reduces downtime and material usage by replacing only worn high-load cast iron sections.

A bin arrangement with a rectangular outlet and counter-rotating pocket feeders ensures uniform material flow.

Steam injectors with small openings introduce direct steam into the liquor phase to raise the impregnation zone temperature.

A helical ramp inlet arrangement aligns with screw feeder rotation to guide chip slurry into the screen basket.

Indirect black liquor heating generates clean flash steam for digester heating, reducing live steam consumption and volatile compound risks.

A reflectance-based fluorometer measures inert fluorescent tracers mixed with surface additives to determine coating concentration in papermaking processes.

Vertical headers with throttle holes prevent precipitation blockages in withdrawal compartments, eliminating costly cleaning shutdowns.

High polysulfide concentration during low temperature impregnation stabilizes carbohydrates, reducing alkali consumption and increasing pulping yield.

Horizontal support arches with expansion slots flex to match digester vessel walls.

Flush-out grooves on conical surfaces remove abrasive particles via hydraulic flow, reducing wear rates and extending operational life.

Segmented screen slides into frame recesses to enable quick withdrawal compartment cleaning without obstructing chip column flow.

Wedge-shaped bottom surfaces guide chip slurry to a pump, eliminating mechanical stirring and preventing material buildup in pulping vessels.

A feeding arrangement uses a force-feeding screw to compress non-wood plant material before it enters a plug screw feeder.

Enzymatic treatment of fibrous cellulosic material reduces water consumption and energy usage by maintaining low moisture content during processing.

Laser line projection and camera detection replace vulnerable mechanical rulers to eliminate cable complexity and calibration errors.

Calculates a wood material indicator ratio from chip mass flow to adjust chemical dosing and pulping temperature in real time.

Flexible woven mesh screen assembly reduces scale deposits and mechanical stress in pulp digesters.

Segmenting the valve body and rotating the member expose fresh surfaces, reducing abrasive wear in lignocellulosic processing.

Rotation of the cylindrical pressure cooker improves gas-liquid-solid mixing efficiency in horizontal digesters.

Extended diverging inlet geometry maintains full screw filling during high-speed operation, boosting production capacity and dewatering efficiency.

A rotating tissue digestor accelerates alkaline hydrolysis to dissolve soft tissue from bone remains.

A movable hinged valve plate adjusts the inlet flow passage area in a flash tank to manage black liquor velocity.

Central pipe-mounted sensor channels monitor digester conditions while preserving vessel wall strength and preventing leakage risks from multiple openings.

Segmented screen bars with T-formed cross-sections enlarge suction gaps to boost withdrawal capacity by up to 250% while maintaining self-clearing action.

Cellulose ester staple fibers with low denier and short cut length enhance water drainage rates, resolving the trade-off between web strength and productivity.

A continuous digestion process for grass-like plant feedstock uses mild alkaline conditions to produce cellulose pulp.

Insulating region between digester downcomers prevents heat transfer between cold blow filtrate and cooking liquor.

Segmented discharge conduits mix pulp flows to prevent stagnation and agglomerate formation in vessels.

Integrated support shoulders on horizontal arches rest against the vessel wall, eliminating welds and reducing installation downtime.

Pneumatic conveyance replaces rolling equipment to transport biomass slurry, reducing energy consumption and pollution from diesel operations.

A chip chute with a rectangular cross-section transports wood chips to pumps.

Segmented storage compartments with localized stirring members resolve uneven mixing and supply efficiency trade-offs.

Screen grid with continuous slots across the low pressure outlet port of a high pressure feeder.

High Kappa number cooking preserves chip structural integrity, preventing plugging and mass transfer failures in continuous digesters.

Parallel pump feed system moves wood chip slurry to a continuous digester, resolving high pressure and maintenance complexity trade-offs.

Segmented nozzles distribute pulp evenly to prevent wall adhesion and air binding while washing systems clean tower surfaces.

Parallel pump feed system maintains optimal chip concentration in a continuous digester by preventing cavitation through high static pressure.

Centrifugal separation in a curved tubular feeding compartment eliminates cyclone clogging and reduces fibre residence time.

Curved slot geometry prevents fiber entrapment in digester top separators, maintaining reliable liquid extraction.

Vertical half-shell housing allows auger removal without full disassembly, reducing maintenance downtime and wear on screw components.

Adjusting the axial position of the compression screw relative to the coil narrows or widens the gap, balancing maceration precision against power consumption.

Dynamic gap adjustment between the worm and coil resolves the trade-off between sealing reliability and power consumption.

A cyclone device separates excess steam from the fibrous material mixture for reuse.