RU2047399C1 - Plant for obtaining conditioned wood raw material - Google Patents

Abstract

FIELD: wood-pulp and paper industry and hydrolytic industry. SUBSTANCE: plant includes sorting with an additional sieve located between the upper and lower sieves of the sorting deck and the hammer crusher. The additional sieve is made in the form of sieve frames with parallel technological and supporting grids with square cells. The cell size of the sifting surface of the additional sieve is less than that of the lower sieve. An additional rectangular discharging branch pipe is located in the lower part of the deck. EFFECT: enhanced quality of the wood reprocessing. 2 dwg

Description

 The invention relates to the processing of the source material before being fed to the main technological process, in particular, to the development of a universal installation for producing wood-based conditioning raw materials for both pulp and paper and hydrolysis production. This is due to the fact that at most enterprises that have sawmill and woodworking wastes, as well as those that produce technological chips, sorting of raw materials is carried out on sortings of chips of the SS type. This results in a conditioned process chips for the pulp and paper industry and a mixture of large and small waste, which, as a rule, is intended for processing at hydrolysis plants. Such a mixture is substandard raw material containing coarse and dusty fractions unsuitable for hydrolysis. To obtain conditioned raw materials for hydrolysis, these wastes must be subjected to additional sorting on specialized sortings of raw materials for hydrolysis. As a result, a cascade of two successively working sortings of different designs is required.

 A known installation (sorting and grinding unit) for producing conditioned wood raw materials for hydrolysis, consisting of specialized sorting of wood raw materials for hydrolysis and hammer crushers. Sorting consists of a deck with an oscillator rigidly attached to it, a support frame and suspension ropes. A section consisting of three parts of a pallet with sides, a grate and a metal tray is rigidly connected to the upper part of the deck. The deck is a rectangular container in which the upper and lower sieves are inserted. Hammer crushed consists of a bed, a rotor and grate. Such a plant is suitable only for producing conditioned hydrolysis feedstocks. The disadvantage of this installation is the lack of the possibility of simultaneous production and conditioned chips for pulp and paper production.

 As a result of the implementation of this utility model, it is possible to simultaneously obtain conditioned raw materials for pulp and paper and hydrolysis production.

 This is achieved by the fact that the sorting unit is equipped with an additional sieve located between the upper and lower sieves of the sorting deck and designed to highlight the conditioned chips. The additional sieve is made in the form of sieve frames with parallel technological and supporting nets, between which there are ball cleaners, which makes the sieve self-cleaning. The technological mesh of the additional sieve is a wire woven mesh with square cells having a size smaller than the mesh size of the upper sieve and larger than the mesh size of the sieving surface of the lower sieve. The sorting dock is equipped with a rectangular nozzle for removing conditioned chips from an additional sieve. A section for separating large-sized wood and mineral inclusions is rigidly connected to the upper part of the deck, made in the form of a bar grate fixed with a reverse inclination with receiving and unloading trays. The receiving tray serves to receive the raw materials supplied for sorting, to form a uniform layer of raw materials and to give large-sized inclusions a position close to horizontal. A grid made of a metal bar with square cells with side sizes from 100 to 200 mm is designed to separate lumpy inclusions, dump raw materials onto grids and evenly distribute raw materials across the width of the grid. The discharge tray serves to remove lumpy inclusions.

 The upper screening screen is a frame with a perforated sheet fixed on it with square cells with side sizes from 25 to 50 mm. To feed substandard wood chips (descent from the upper sieve) into the hammer mill, a tray with a smooth metal bottom, which is a continuation of the sieve surface, serves. The lower sieve has a screening surface with a square mesh side size of 1 to 2 mm. A hammer crusher with a lower discharge, a grate and an adjustable gap between the hammers and a grate for regrinding substandard chips is located directly below the tray of the upper screening screen or at some distance from it, and in this case, a conveyor is used to supply substandard chips from the tray to the loading window of the crusher.

 In FIG. 1 shows a plant consisting of sorting 1 with a separation section for large-sized inclusions 2 and a hammer mill 3, a rectangular pipe 4 for removing conditioned chips G (for pulp and paper production); rectangular pipe 5 for the removal of air conditioning screening D (for hydrolysis); funnels 6 for unloading the pulverized wood fraction E. Figure 1 adopted the designation: A feedstock; B lumpy inclusions; In substandard chips; W crusher.

Sorting (figure 2) consists of a deck 1 with a vibrator 7 rigidly attached to it, a section for highlighting lumpy inclusions 2, a support frame 8 and suspension ropes 9. The oscillator 7 and the deck are driven by an electric motor 10. The deck is a frame in the form of a rectangular container . A section in the deck shows an additional self-cleaning sieve made in the form of sieve frames 11. The sieve frame is made of wooden beams 12 of a certain section. A supporting grid 13 is attached to the bottom of the frames of the frame, and a technological grid 14, which is a woven wire mesh with square cells with side sizes from 4 to 15 mm, is attached to the top of the beams. Between the support and the technological grid are rubber balls 15, designed to clean the technological grid in the process. The oscillator is a frame in which a vertical shaft 16 with an unbalance 17 and a pulley 18 is fixed in the bearings. An engine is attached to the frame. The rotation from the engine to the unbalance shaft is transmitted by V-belt drive 19. The unbalance and V-belt drive are closed by guards. The deck is suspended from the support frame to be inclined ^about 8, and wherein the oscillatory shaft mounted vertically. The oscillator provides circular sorting oscillations in the horizontal plane. The support frame is a three-dimensional structure of channels with blocks for sorting suspension ropes.

 The installation works as follows (figure 1). The crushed wood raw material A is fed to the separation section for large-sized inclusions 2 of sorting 1. The raw materials are sorted by circular oscillatory motions and the inclination of the screening surfaces 20, 14, 21. The raw material to be sorted passes through the lattice cells of section 2, and the large-sized wood remain on the grate , mineral and metal inclusions B, which are removed from sorting by the tray of section 2. The raw material passing through the grate is sorted on the upper screen 20 sorting. Substandard wood chips B from the sieve 20 on the tray, which is its continuation, is removed from the sorting and sent to regrinding in a hammer mill 3. Particles passing through the upper sieve fall on an additional sieve 14 sorting. From this sieve, the conditioned chips enter the rectangular discharge pipe 4 for chips. Particles passing through an additional sieve, fall on the lower sieve 21, from which the conditional screening enters the rectangular discharge pipe 5 for screening. The pulverized wood fraction E, separated from the conditional screening, passes through the lower sieve and moves along the pallet to the funnel 6, through which it is unloaded from sorting. Substandard chips B through the loading window 10 of the hammer mill 3 is fed into the crushing chamber. Being hit by rapidly alternating hammers with cutting edges and due to the presence of grid-irons also having cutting edges, the chips are crushed using the phenomena of kink and cutting, and are thrown down through the grate. Crusher W combines with air conditioning screening D and is sent for processing.

 When the oscillating movements of sorting (figure 2) rubber balls 15 move freely in the sieve frame 11, receiving blows from the main wooden beams 12, hit the bottom of the technological grid 14 additional sieve and clean it of stuck particles.

 For example, a raw material containing 1 lumpy inclusions, 15 substandard wood chips, 6 pulverulent wood fractions, 60 conditioned wood chips, 18 conditioned sawdust is supplied to a plant for producing conditioned wood raw materials.

The target products obtained at the installation have the following fractional composition:
technological chips (descending from an additional screening screen) there are no large-sized inclusions, substandard chips 4.0 are fine fractions (passage through a sieve with holes with a diameter of 5 mm) 8.5 conditioned chips are 87.5 The composition of the technological chips complies with GOST 14815-83;
technological sawdust (a mixture of raw materials from the lower screen and crushers from a hammer mill) there are no large-sized inclusions, substandard chips 4.5 dust-like wood fractions (particles passing through a sieve with holes with a diameter of 1 mm) 3.0 main fraction 92.5 Composition of technological sawdust corresponds to GOST 18320-78.

 In the raw materials that have passed the installation, which is the prototype of the invention, there is no separate fraction called wood chips, and the so-called conditioned fraction is a raw material suitable only for hydrolysis production, i.e. there is no additional allocation of conditioned wood chips going to the pulp and paper industry.

Claims (1)

 PLANT FOR PRODUCING CONDITIONAL WOOD RAW MATERIALS, including sorting and a hammer mill, characterized in that the sorting of the plant is equipped with an additional sieve with rubber ball cleaners located in the deck between the upper and lower sieves, made in the form of sieve frames with parallel technological and supporting grids with square meshes moreover, the cell size of the sieving surface of the additional sieve is smaller than the cell size of the upper sieve and larger than the cell size of the sieving surface of the lower sieve sieve at the bottom of the deck there is an additional rectangular discharge conduit.

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