CN1292445A

CN1292445A - Chemical mechanical pulp-making method and equipment

Info

Publication number: CN1292445A
Application number: CN 99120924
Authority: CN
Inventors: 刘长恩
Original assignee: LIU CHANG'EN
Current assignee: LIU CHANG'EN
Priority date: 1999-09-24
Filing date: 1999-09-24
Publication date: 2001-04-25
Anticipated expiration: 2019-09-24
Also published as: CN1091820C

Abstract

The present invention relates to a method for producing chemical mechanical pulp by adopting twin screw pulp grinding machine and its equipment. Its main technique is characterized by adding steam and chemical agent into the pulp grinding machine from its inlet, and utilizing forward scroll cover and backward scroll cover to implement the processes of charging, extruding, shearing and grinding so as to make the softened plant fibre raw material into the invented pulp. Besides, the hard impurity in the raw material can be squeezed into the impurity-discharging device in the pulp grinding machine, and then can be discharged out of said grinding machine so as to ensure safe and stable operation of said equipment.

Description

A kind of chemical mechanical pulp-making method and equipment

The present invention relates to a kind of chemical mechanical pulp-making method of producing paper pulp with plant fiber material.

Grinding stone wood grinder or disc mill are generally all adopted in mechanical feedback.It is with plant fiber material, after mill is separated, isolates fiber.In the mechanical pulp that disc mill is produced, the fiber content height, performance is better than Stone Ground Wood.Chemical-mechanical pulping is with fibrous raw material, through Chemical Pretreatment, grinds the method for separating pulping again in disc mill, and the slurry of being produced is called chemi-mechanical pulp.Because Chemical Pretreatment has been softened timber, after separating, mill can isolate complete fiber morely, and the long fiber component is many, makes the indexs such as intensity of chemi-mechanical pulp be better than mechanical pulp.The disc mill that uses in the production process belongs to cutter formula fiberizer.During defibrination, fibrous raw material be subjected to the abrasive disc cutter tooth stronger cut, cut effect, fiber shortens, the strength character of slurry is affected; And the abrasive disc cutter tooth constantly is worn in the defibrination process, and the quality of slurry also therefore and constantly worsens.The disc mill abrasive disc generally is to be made by the abrasion-proof corrosion-proof metal material, and cost is higher; Its replacing has increased the cost of starching.In addition, in the defibrination process, most of energy of input disc grinding machine is converted into heat energy, and the energy that really is used for defibre only accounts for sub-fraction, and capacity usage ratio is very low.Be to reduce the cutting action of abrasive disc cutter tooth to fiber, industrial also have adopt nonmetal abrasive disc, but specific energy consumption is not seen reduction.

The objective of the invention is to overcome disc mill and grind the shortcoming of separating when chemically treated plant fiber material is produced chemi-mechanical pulp, change the mode of production of traditional chemical mechanical pulp, according to raw material and production technology needs, separate preceding or mill is separated and added steam, chemical liquid in the process at mill, make plant fiber material under low specific energy consumption, low cost, the chemi-mechanical pulp that producd fibers is long, bond strength is high.

The task that the present invention will solve is: produce the chemi-mechanical pulp that conforms with quality requirement with plant fiber material; Safe and reliable to operation for assurance equipment, the device of removing hard impurity piece should be arranged in the equipment.

The present invention seeks to realize like this: utilize Chinese utility model patent (application number: 97214188.X, Granted publication number: CN2291435Y) described double helix roller type paste mill, and being improved, finish the task that the present invention will solve.The double helix roller type paste mill belongs to no cutter formula fiberizer.It is work like this: motor drives two propellers that are installed in the housing through transmission case.For ease of detecting ruuning situation and changing screw casing, housing is a dissection type, is made up of upper casing and lower casing.Be provided with in the casing and two corresponding cavitys of propellers shape size.Upper casing one end has charging aperture, and plant fiber material enters fiberizer thus, and the other end of lower casing is a discharging opening, separates back gained slurry to discharge mill.Two propellers are engaged with each other, parallel, rotation in the same way.Propellers are overlapped by mandrel and dress several groups of right-handed screws thereon and the backpitch cover is formed.The pitch of first group of right-handed screw cover from large to small.Have several on the spiral shell rib of backpitch cover by the outside footpath down fold in axle center.Every group of right-handed screw overlaps and a slurry mill of the backpitch cover formation section of separating, and the backpitch cover is made up of the spiral piece of several helical pitches, forms the higher-pressure region during defibrination herein.In the right-handed screw section, because the engagement of screw casing, make the material power that is squeezed; In the region of engagement,, material is produced shearing force because propellers rotate in the same way.Overlap under the reverse propelling movement effect at backpitch, material accumulates gradually, is full of, and forms the higher-pressure region, and material is subjected to bigger extruding force and shear force.Material is in just propelling movement process, and the right-handed screw cover has directed extruding and conveying effect to fibre material; When the backpitch roller oppositely pushes, this orientation is arranged also.Therefore, fibre material is in high pressure defibrination district, and fiber axis is to being subjected to bigger extruding force, help fibre material at fiber axis to cracking, strengthened soup and soaked into and the fiber separation effect.Mill separate refinement material, extrude by the skewed slot of opening on the backpitch cover spiral shell rib, enter next section defibrination district.By the number and the big or small variation of skewed slot, can control soup infiltration and refining effect.Upper casing is provided with a plurality of inlets, and lower casing is provided with a plurality of leakage fluid drams.The present invention is exactly the inlet that utilizes upper casing, enters steam and soup (NaOH, the Na of the required pressure of technology ₂SO ₃, NaHSO ₃Deng), with plant material heating, dipping, make material that chemical reaction take place in casing, softening plant fiber material.Preceding several defibrination sections mainly are to finish the reinforcement dipping of raw material; The defibrination section of back mainly is to finish the defibrination effect.Two propellers of double helix roller type paste mill rotate in the same way.It is not very sensitive to the less hard impurity piece of shape in the access arrangement.But for fear of big hard impurity piece damage equipment, the purification of fibrous raw material, the removal of impurity, the present invention is provided with the device of removing hard impurity piece before the double helix roller type paste mill first defibrination district before should strengthening access arrangement, to guarantee equipment safety operation.

Below in conjunction with accompanying drawing, describe implementation method of the present invention in detail.

Fig. 1 is the double helix roller type paste mill side view that the concrete enforcement of the present invention is adopted.

Fig. 2 is the vertical view of fiberizer among Fig. 1.

Fig. 3 is the pulp-milling mechanism vertical section sketch of fiberizer among Fig. 1.

Fig. 4 is the pulp-milling mechanism diagrammatic top view of fiberizer among Fig. 1.

Double helix roller type paste mill shown in Figure 1 is made up of motor 1, transmission case 3, upper shell 10, lower house 11, charging aperture 8, discharging opening 12 etc.

In the double helix roller type paste mill general structure vertical view shown in Figure 2, charging aperture 8, discharging opening 12, inlet 9 etc. are shown.

Leakage fluid dram 14 and except that hard impurity block assembly 15 in the double helix roller type paste mill pulp-milling mechanism skiagraph shown in Figure 3, is shown by right-handed screw cover 16 and backpitch cover 17 propellers of forming 18, and inlet 9.

Two engagements, parallel, homodromal propellers 18 are housed in the housing shown in Figure 4.

During the work of double helix roller type paste mill, motor 1 drives belt pulley 2 and transmission case 3 through belt, and by axle 4 outputs, spline housing 5 links up the mandrel 7 of axle 4 and propellers, gives two propellers 18 with transmission of power with power, makes it parallel rotation in the same way.Bearing block 6 on the support 13 is supporting the mandrel 7 of propellers 18.

Raw material falls in the chamber that casing 10,11 forms by charging aperture 8 and the required soup of chemical reaction together.Under the right-handed screw cover 16 of material two propellers in chamber, A district pushes, move to discharging opening 12 ends.The pitch of the right-handed screw cover 16 in the A district forms compression ratio about 2 from large to small, to strengthen the soup dipping.After finishing the preliminary dipping of soup, the part waste liquid is discharged by lower house leakage fluid dram 14.The A district do not hold and top, B district between, material is subjected to fierce the stirring, overlaps the material and the hard impurity piece of first helical pitch spiral shell rib perforate greater than backpitch, is arrested in this.Material after form diminishes, passes first helical pitch backpitch cover spiral shell rib perforate under extruding force and shear action, enter the higher-pressure region that next helical pitch screw casing forms.Hard impurity piece greater than perforate finally is pressed in the groove of the hard impurity block assembly 15 of the set removal of lower casing.After the accumulation, stripping device is discharged to it outside body.Material is reversed spiral and oppositely pushes in the B district that backpitch cover 17 forms, and forms the higher-pressure region.Material concentration reaches 30～35% herein, and issues biochemical reaction in this high concentration.When pressure acquires a certain degree, partial material is separated less than the perforate of backpitch cover spiral shell rib by mill, then by passing in the hole, following current is mobile to C district.Material becomes loose expansion state by compressive state at this moment.The inlet 9 that casing 11 is offered above the district enters the Steam Heating material according to arts demand thus, also can add the required soup of reaction simultaneously.Material overlaps in the 16 spiral shell chambeies at C district right-handed screw under self-friction heat and steam heat and chemical liquid acting in conjunction, and dipping suctions soup fully, under following current pushes, chemical reaction and mill takes place separate process.Do not hold in the C district, the leakage fluid dram 14 that unnecessary waste reaction solution is offered by lower casing is extruded.Then, material enters the D district that backpitch cover 17 forms.By that analogy, behind material process E, F, G, the H district, become chemi-mechanical pulp, discharged by discharging opening 12.

Upper casing 11 can be lifted by pivot 19, so that change screw casing and checkout facility operation conditions.

Claims

1. method of producing chemi-mechanical pulp with the double helix roller type paste mill.

2. according to claim 1 producing adopted the double helix roller type paste mill in the chemical machinery paste-making method, it is characterized in that utilizing the inlet on its housing to enter steam and soup, utilizes leakage fluid dram to discharge reaction back waste liquid.

3. according to the described double helix roller type paste mill of producing in the chemi-mechanical pulp to be adopted of claim 1, it is characterized in that forming on the regional corresponding casing and be provided with the device of removing hard impurity piece at first group of right-handed screw and backpitch cover.

4. according to the described device of removing hard impurity piece of claim 3, it is characterized in that: utilize the stirring of positive and negative screw casing, will be squeezed into greater than the hard impurity piece that backpitch overlaps the perforate of spiral shell rib in the groove that casing is provided with, and regularly open groove, its cleaning is drained into outside the machine.