CN214811401U - Pulp crushing device by dry method - Google Patents

Abstract

A device for crushing pulp by a dry method, which belongs to the technical field of lyocell fiber production. Paging machine and tractor are carried through belt and roller respectively and are connected coarse rubbing crusher, and coarse rubbing crusher passes through the fine rubbing crusher of pipe connection, and fine rubbing crusher passes through the heavy matter edulcorator of pipe connection, and the heavy matter edulcorator passes through pipe connection pay-off fan, and the pay-off fan passes through the pipe connection feed bin, and the draught fan is connected to the feed bin, and feed bin output material goes to make and glues. The utility model has the advantages that improve the quality of system glue and the off-the-shelf stability of lyocell, reduce NMMO recovery cost and investment cost.

Description

Pulp crushing device by dry method

Technical Field

The utility model relates to a device of pulp is smashed to dry process belongs to lyocell's production technical field.

Background

Cellulose is a main component of plant cell walls, can be derived from trees, cotton, hemp and other plants, and is widely distributed, inexhaustible and inexhaustible in nature. Generally, most organic substances containing hydroxyl groups are readily soluble in water, such as alcohol, glucose, and the like, but cellulose is insoluble in water and most organic solvents. The molecular weight of cellulose is generally large, and is hundreds of low, and is tens of thousands of high, and intramolecular and intermolecular hydrogen bonds are easily formed, and the acting force covers the affinity action of a part of hydroxyl groups to water, so that the cellulose is insoluble in water or common organic solvents.

As petroleum resources are gradually reduced and influenced by factors such as the consciousness of advocating nature, health and environmental protection, people gradually turn to regenerated cellulose fibers. Lyocell fiber (Lyocell) is commonly called as "velveteen", is made from natural plant fiber as a raw material, is known in the middle of the 90 s of the 20 th century, and is known as the most valuable product in artificial fiber history in the last half century. The Lyocell fiber has various excellent performances of natural fiber and synthetic fiber, Lyocell is green fiber, raw materials of Lyocell are inexhaustible cellulose in nature, a production process has no chemical reaction, a used solvent is nontoxic, the recovery rate of the solvent can reach more than 99%, and the production process is green and environment-friendly, so the Lyocell fiber is called as '21 st century green fiber'.

The lyocell fiber production technology is a relatively mature solvent method regenerated cellulose fiber industrialized production technology at present, and domestic and foreign enterprises, colleges and scientific research institutions have more relevant researches, but relatively few lyocell fiber complete production technologies can be really mastered, and as a foreign enterprise which monopolizes the lyocell fiber production technology for a long time, the lyocell fiber production technology mastered a series of most advanced lyocell fiber relevant technologies such as lyocell fiber production equipment and production technology, breaks through the blockade of the production technology and equipment by the foreign enterprise, develops a mature and reliable lyocell fiber production technology and equipment, and can powerfully promote the development of the field of new fiber materials.

At present, the domestic lyocell production factory adopts a wet glue-making production process, namely, raw material pulp is mixed with water in a hydrapulper device, the raw material pulp is broken by hydraulic force and is fully mixed with the water to form fluid pulp gruel-shaped material with the pulp concentration of about 4-5%, then the fluid pulp gruel-shaped material is conveyed to a squeezer device by a low-concentration pulp pump to be extruded and dehydrated to obtain pulp with the dryness of about 45%, then a crusher is used for crushing the wet pulp, and NMMO (N-methylmorpholine oxide) solution is added for full mixing after crushing to prepare glue solution. The wet glue making process has obvious defects that firstly, the pulp dryness fluctuation of the squeezed pulp is large, and the stability is poor, so that the concentration of NMMO (cellulose suspension) of cellulose suspension prepared by mixing the pulp with the NMMO solution fluctuates, and the quality of subsequent glue making and the stability of a finished product are influenced; and secondly, redundant water is brought into a production system, so that the subsequent solvent recovery amount is increased, and the solvent recovery investment cost and the operation cost are increased.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a device for crushing pulp by a dry method.

The utility model provides a device of pulp is smashed to dry process, paging machine and tractor are carried through belt and roller respectively and are connected coarse crusher, and coarse crusher passes through the fine rubbing crusher of pipe connection, and fine rubbing crusher passes through the heavy matter edulcorator of pipe connection, and the heavy matter edulcorator passes through pipe connection pay-off fan, and the pay-off fan passes through the pipe connection feed bin, and the draught fan is connected to the feed bin, and feed bin output material goes to make and glues. The specification of the plate-shaped wood pulp is 600 x 800, a paging machine is adopted to separate and convey the plate-shaped wood pulp to a coarse crusher by a single sheet, the conveying capacity of a single machine is 1-2 t/h, the specification of the roll-shaped wood pulp is phi 1200 x 800, a traction machine is adopted to continuously feed the roll-shaped wood pulp to the coarse crusher through a roller, and the conveying capacity of the single machine is 1-2 t/h.

The roller is a cylindrical rotating part in textile machinery which plays roles of feeding, drafting, outputting and the like, is a transliteration of the English word "roller" and has the meanings of a roller and a shaft. The roller is a general name of a cylindrical machine element capable of rolling.

A method for dry-pulverizing pulp comprises the following steps:

step 1, selection and conveying of dissolving pulp: and for the plate-shaped wood pulp, a paging machine is adopted to separate and convey the plate-shaped wood pulp into a coarse crusher, and for the rolled wood pulp, a tractor is adopted to continuously feed the rolled wood pulp into the coarse crusher through a roller.

Step 2, a coarse crusher processing step: sheet raw material dissolving pulp conveyed by a paging machine or a tractor enters a coarse crusher through a feeding device to be transversely and longitudinally cut and crushed by force to form small blocky pulp blocks, and the crushed irregular blocky pulp is filtered by a sieve plate and is sucked away by a subsequent feeding fan.

Step 3, fine pulverizer processing: the pulp which is coarsely crushed into chips enters the fine crusher again under the action of wind power, a screen is also arranged at the lower part of the crushing area, qualified materials are discharged out of the crushing area through the screen, unqualified materials are brought into the crushing area by high-speed airflow to be continuously crushed, and pulp cellulose materials crushed by the fine crusher are still sucked away by a subsequent feeding fan.

And 4, processing a heavy impurity remover: the heavy impurity removal is carried out on the pulp cellulose material, the gas and the slurry with low density rise under the combined action of centrifugal force, centripetal force, buoyancy and fluid drag force and are discharged from a top outlet, and the heavy impurities with high density are discharged from a sewage outlet at the bottom of the equipment.

Step 5, pneumatic transmission: the materials are pneumatically conveyed after being crushed.

Step 6, storage of the storage bin and dust removal separation: the slurry crushed in the 2-stage enters a stock bin under the action of a feeding fan, tail air is firstly dedusted by a cloth bag under the action of a draught fan, the tail air is discharged into the atmosphere to be emptied, and the lower part of the stock bin is a material storage area.

The utility model has the advantages that improve the quality of system glue and the off-the-shelf stability of lyocell, reduce NMMO recovery cost and investment cost.

The technical effects and advantages also include the following:

1. in the production process of Lyocell, the key point of high-performance fiber production is to prepare a spinning solution which is uniform, has proper viscosity and meets the requirements of various indexes, so the process control in the dissolving process of dissolving pulp is very important, and the finally prepared colloid index is controlled to be nD 50: 0.8-2, cellulose content: 8-14%, NMMO content: 65-85%, N/C: 5.5-8.5, viscosity: 300 to 600 Pa.s.

2. In the production process of the Lyocell, the raw materials have uniform granularity and stable water content, are favorable for mixing and dissolving subsequent slurry and an NMMO solution, and are favorable for stable production and improvement of quality. The utility model discloses the dry process is broken, has improved the quality and the off-the-shelf stability of follow-up system glue, has reduced solvent recovery investment cost and running cost.

3. The utility model discloses the flow is simple, and equipment is less. 2 times of continuous crushing, coarse crushing and fine crushing are directly connected in series by air ducts, and continuous operation is carried out.

3. The utility model discloses on the wind channel after the fine crushing, set up heavy matter edulcoration ware to reduce debris such as metals and get into the epilogue flow, have the safety protection effect. (the device is not needed, and the normal use of the utility model is not affected)

4. The utility model discloses the feed bin has the function of keeping in and removing dust concurrently, does not need to set up dust collector in addition.

Drawings

The invention itself, however, as well as many of the attendant advantages thereof, will be best understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein like reference numerals indicate like parts throughout the several views, and wherein:

fig. 1 is a schematic structural diagram of the present invention.

The present invention will be further explained with reference to the drawings and examples.

Detailed Description

Obviously, many modifications and variations of the present invention based on the spirit of the present invention will be apparent to those skilled in the art.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.

The following examples are further illustrative in combination to facilitate understanding of the embodiments, and are not to be construed as limiting the invention.

Example 1: as shown in fig. 1, a method for dry-pulverizing pulp comprises the following steps:

step 1, selection and conveying of dissolving pulp: dissolving pulp supplied on the market is often sold in a plate-shaped or roll-shaped packaging form, and two kinds of pretreatment devices are respectively provided for the dissolving pulp in the two packaging forms. Aiming at plate-shaped dissolving pulp, the specification is 600 x 800, a paging machine is adopted for single-sheet separation conveying, and the conveying capacity of a single machine is 1-2 t/h; aiming at the roll-shaped dissolving pulp with the specification phi 1200 x 800, a tractor is adopted for continuous paper feeding and conveying, the conveying capacity of a single machine is 1-2 t/h, and the water content of the raw material dissolving pulp is required to be 8-10% in the national standard range.

Step 2, a coarse crusher processing step: sheet raw material dissolving pulp conveyed by a paging machine or a tractor enters a coarse crusher through a feeding device, is conveyed to an inner curved surface combined knife roller of the coarse crusher at a constant speed, the lower fixed knife is 8, the upper knife roller of the crusher is in a rotary type, 36 hammer sheets are uniformly distributed on the roller, transverse and longitudinal strong cutting and crushing are carried out to form fine blocky pulp blocks, and the pulp blocks after crushing are irregular blocky, different in thickness and different in specification. The lower part of the coarse crusher is a grid type sieve plate with the aperture of 40mm, the crushed irregular blocky slurry is filtered by the sieve plate, small blocks (less than 40 mm) are sucked by a subsequent feeding fan, and large blocks are left in the crusher to be continuously crushed until the small blocks are changed into small blocks. The heat generated in the crushing process is also taken away with the wind and the materials, and the effect of cooling the inside of the machine body is achieved.

Step 3, fine pulverizer processing: the pulp which is coarsely crushed into flakes enters the fine crusher again under the action of wind power. The fine crusher is a high-speed rotating shearing type superfine crusher. Big chip form wood pulp paper gets into the crushing district that moves sword and stationary knife and constitute rapidly under the high-speed air current effect, and the reducing mechanism who utilizes advanced aerodynamics and bionics design, move sword and stationary knife and become a special shearing angle, realize blocky, the cotton-like, fibrous crushing through cuting fast, the rotor of high-speed rotation drives the produced powerful rotatory air current of moving the sword and drives the material and move between the stationary knife, fully disperse and reach superfine kibbling effect of cuting. The lower part of the crushing area is also provided with a screen, qualified materials are discharged out of the crushing area through the screen, and unqualified materials are brought into the crushing area by high-speed airflow to be continuously crushed; the materials are always surrounded by air in the stay of the pulverizer, so that the heat inevitably generated in the process of ultrafine grinding is also taken away by high-speed airflow, and the aim of normal-temperature grinding is fulfilled, so that the ground materials have stable chemical components and unchanged performance.

The screen mesh at the lower part of the fine crushing is a stainless steel mesh with about 6 meshes, and the bulk density of the pulp cellulose material crushed by the fine crusher is more than 80 g/L.

And 4, processing a heavy impurity remover: the heavy impurity remover adopts a cyclone sand remover, and according to the principles of centrifugal sedimentation and density difference, after a material and air current mixture enter equipment from an inlet of the sand remover in a tangential direction under certain pressure, strong rotary motion is generated.

Step 5, pneumatic transmission:the materials are pneumatically conveyed after being crushed. Behind the fine crusher, 1 feeding fan is arranged. The coarsely crushed large materials are transferred to a fine crusher, and the secondarily crushed qualified materials are fed into a storage bin and are driven by high-speed airflow of a feeding fan. Air quantity 5500-7000 m of fan³The air pressure is 8148-8857 Pa, and the material conveying capacity is 1-2 t/h. And the motor variable frequency control adjusts the air pressure of the system according to the actual condition of the system.

Step 6, storage of the storage bin and dust removal separation: the slurry crushed in the 2-stage enters a stock bin under the action of a feeding fan, and tail air is firstly dedusted by a cloth bag under the action of a draught fan and then discharged into the atmosphere for emptying.

The feed bin has the function of keeping in and removing dust concurrently. The lower part of the storage bin is a material storage area, a discharge screw is arranged, and the upper part of the storage bin is provided with a cloth bag dust removal device. After the materials and the wind enter the bin, most of the materials are blocked by the cloth bag and fall into the lower part. Air and dust materials enter the bag-type dust collector at the upper part for dust reduction treatment, when dust-containing gas passes through the dust collector, dust is captured on the outer surface of the filter bag, and clean gas enters the filter bag and is filtered by the bag-type dust collector and then is emptied. The cage inside the bag serves to support the bag against collapse and at the same time it facilitates the removal and redistribution of the dust cake. The filtering precision of the bag is 5-50 mu m, the materials collected on the outer surface of the filter bag are deposited to the lower end of the bag-type dust remover after being swept by pulse compressed air; the dust pelletizing system sets up 1 high-pressure positive blower and installs at the feed bin air outlet as supplementary draught fan, guarantees the wind pressure and the wind speed in the pipeline, reaches and carries the effect. The induced draft fan is also controlled in a frequency conversion mode, the air volume is about 2 times that of the feeding fan, the air volume is 10314-20628 m3/h, and the full pressure is 2734 Pa.

As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the invention and its effects. Therefore, all such modifications are included in the scope of the present invention.

Claims (4)

1. The utility model provides a device of pulp is smashed to dry process, its characterized in that paging machine and tractor are carried through belt and roller respectively and are connected coarse rubbing crusher, and coarse rubbing crusher passes through the fine rubbing crusher of pipe connection, and fine rubbing crusher passes through the heavy matter edulcoration ware of pipe connection, and the heavy matter edulcoration ware passes through pipe connection pay-off fan, and the pay-off fan passes through the pipe connection feed bin, and the draught fan is connected to the feed bin, and feed bin output material goes to make and glues.

2. The apparatus for dry-pulverizing pulp according to claim 1, wherein the screen mesh at the lower part of the fine pulverizer is a stainless steel mesh of 4-8 meshes.

3. The apparatus according to claim 1, wherein the heavy impurity remover is a cyclone sand remover, the inner curved surface of the coarse crusher has 8 fixed blades at the lower part, the upper knife roller of the coarse crusher is rotatable, and 36 hammer blades are uniformly distributed on the roller.

4. The apparatus of claim 1, wherein a feeding fan is disposed behind the fine crusher, the lower part of the bin is a material storage area, a discharging screw is disposed, and the upper part of the bin is a bag-type dust collector.

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