New Chemi -Mechanical Pulping Process Equipments

CHEMI- MECHANICAL PULPING PROCESS EQUIPMENTS

Wenrui developed chemi- mechanical pulp process equipment’s. The research experimentation 75t/d process has been completed. The trail –manufacture and application of the key equipment’s of process has also been completed. The key equipment’s of process include chemical pulping process, this process has such advantages as less investment, low operating cost, low water consumption, high pulp yield, less pollution and realizing clean production. This process filled a technology gap in China, reaching international advanced level.

Overview-chemi-mechanica pulping system

 

Chip Washing and purifying System

New chip washing system consists of chip washer and inclined dewatering screw and auxiliary system as filtering screen, rejects screw and cleaner. Unique design makes attractive appearance, stable, economic and practical. It applies to wet preparation for wood chip, bamboo chip, cotton stalk, reel and straws.

Chip washing and puryfuing system

Advantage

–          Compact structure, convenient maintenance

–          High capacity and washing efficiency.

–          Low water consumption, water circulation >=90%

–          Auto controlled washing and rejects removing, easy operation

–          Advance structure guaranteeing chip dryness.

–          Good producing environment, energy saving.

Chip Washer

Chip washer machine is a key to the process of preparation and washing with the function of get rid of sand and metals in the chips in order to fluffing and pulping for the chips.

Chip Washer

Structure Feature

Chip washer mainly consists of vat, drum, and sediment tank, frame and drive unit. Chip goes into washer through screw conveyor. By centrifugal force of drum, chips goes out of washer through discharge nozzle, and then drops into dewatering screw. When chips move in the vat, heavy impurities separate from chips due to agitation of water flow and drum by gravity. Heavy impurities fall through conical bottom into tube type sediment tank from which they are drained.

Technical Parameters

Technical parameters - Chip washer

 

Inclined Dewatering Screw

The inclined screw drainer is one of the key equipment’s in chemi-mechanical pulping process. Its function is dewatering the washed chips through filtrate plate by itself gravity from the chip washer, and sending the chips to the steaming chamber to reach the required dryness of the sequent steam chambers. Impurities will be separated from the filtrate when flows through the inclined screen. The filtrate will be washed by the wire-washing system.

Inclined dewatering screw

Structure Feature

The structure of the strainer is inclined screw structure. On the bottom of it is sieve plate, under which there is anti-blocking device.

Technical Parameters

Technical parameters - dewatering screw

 

Extrusion and Splitting Machine

Extrusion and Spitting machine is the key equipment to chemical pre-treatment stage of chemical mechanical pulp, the material will be completed softened by steam cooking, and then enters the machine to be pushed by diameter-changing screw. The discharge volume will become smaller gradually to press the material. The formal material structure will be spited to be discharged in the form of compacted form which can completely digest chemical liquors and do chemical reaction during impregnation stage.

Extrusion splitting machine

Structure Feature

Extrusion and Splitting Machine is composed by drive unit, support part, pressing part, diameter-changing screw, washing device etc. The pressing part is composed by in-out double layer compound wires. The inner fine wires are for water filtration function, outside thick wires to transfer the filtrate and structure strength function with anti-slipping belts and stud. The outer diameter of diameter-changing screw will not change; the inner diameter will increase gradually. Or the inner will not change, the outside will reduce gradually. The screw shaft is single-end cantilever support structure.

Technical Parameters

Technical parameters -extrusion and splitting machine

 

Impregnator

 Impregnator

Impregnator is important equipment in chemical pretreatment stage of chemical pulp Chips from extrusion and splitting machine fully take in chemicals during expansion in the vertical impregnator so that it can effectively react with the pulp in the reactor bin. According to different installation structure, there are two types of impregnator; inclined impregnator and vertical impregnator. The inclined impregnator has a single screw structure. And vertical impregnator is of vertical double screw, and consists of shell and two vertical screw shafts or single vertical screw shaft by which the pulp will be lifted for transfer.

Technical Parameters

Technical parameters -Impregnator

 

Reactor bin

Reactor bin is one of the key equipment in the APMP process, where material is bleached and reacts with the chemicals after material immerses the chemicals. Material drops to reaction bin from inlet of the bin after they are immersed in the chemicals in the impregnator. When steam goes to the bin, to heat the material with steam, material retains in the bin for some time. After that material will be continuously taken out by discharge screw at the bottom of the bin. Diameter-changing screw shaft can ensure constant time of the material reacting with the chemicals fully and evenly, so that treated material will be prepared for refiner in the Following stage.

Reactor bin

Structure Feature

Reactor bin is mainly composed of conical body at the top and several horizontal discharge screw shafts at the bottom. The shaft is pitch & diameter changing (or non-changing diameter) Impeller.

Technical Parameters 

Technical parameters - Reactor bin

 

 

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