CN115342601B - OSB shaving board drying method - Google Patents
OSB shaving board drying method Download PDFInfo
- Publication number
- CN115342601B CN115342601B CN202210980933.6A CN202210980933A CN115342601B CN 115342601 B CN115342601 B CN 115342601B CN 202210980933 A CN202210980933 A CN 202210980933A CN 115342601 B CN115342601 B CN 115342601B
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- planing
- drying
- flue gas
- hot
- roller dryer
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- 238000001035 drying Methods 0.000 title claims abstract description 87
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003546 flue gas Substances 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 43
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 239000012535 impurity Substances 0.000 claims abstract description 22
- 230000009194 climbing Effects 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims description 26
- 239000000779 smoke Substances 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 19
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012946 outsourcing Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 210000001503 joint Anatomy 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
- F26B3/12—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
Abstract
The invention discloses a drying method of OSB shaving boards, which is characterized in that hot flue gas of a climbing pipe section of a built-in shaving board is sprayed upwards, the shaving board guided by a feeding nozzle is dispersed by the hot flue gas sprayed, heavy impurities are separated from the shaving board to be settled and separated, and the requirements of outsourcing and recycling of the shaving board are reduced; the dispersed planing plates float upwards and absorb the heat of hot flue gas, the pre-dried planing plates enter a roller dryer, the tail gas discharged by the roller dryer is partially led into a mixing air chamber and is mixed with the hot flue gas in the mixing air chamber, the mixed hot flue gas is put into a planing plate climbing pipe section to obtain a mixed gas which is low in oxygen and has a certain amount of homogeneous moisture higher than the internal temperature of the roller dryer, the planing plates dispersed and sealed in the pre-drying bent pipe are pre-dried by the mixed gas, the heat utilization rate of the planing plates obtained by pre-drying is higher, the quality of the planing plates obtained by drying by the roller dryer is better, and the planing plate press keeps stable production efficiency and product quality.
Description
Technical Field
The invention relates to planing processing, in particular to an OSB shaving board drying method.
Background
In the shaving board production process, the shaving board drying quality directly influences the production speed and the product quality of the press, including the shaving board water content and the shaving board carbon burning degree.
In the existing planing drying, only a roller dryer is simply used, the planing is directly arranged at the inlet of the roller dryer, the temperature of the drying inlet of the roller dryer is higher, the substantial drying time of the planing in the roller dryer is shorter, the heat utilization rate of drying is lower, the water content of the planing obtained by drying is difficult to control, and the surface of the planing is easy to have a certain carbon burning phenomenon. Therefore, the planing plate obtained by the drying has larger fluctuation of water content, which also means the reduction of the planing plate pressing productivity and the unstable quality; in addition, the surface-burnt planing results in reduced planing productivity and unstable quality.
In addition, the drying is not separated by heavy objects, and the drying has high requirements on reclaimed materials and outsourcing materials.
Disclosure of Invention
The invention aims to solve at least one of the above-mentioned technical problems and provides an OSB shaving board drying method, which improves the quality of the shaving board obtained by drying and ensures that the shaving board press keeps stable production efficiency and product quality.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an OSB particle board drying method comprising the steps of:
preparing hot smoke, wherein the hot smoke is obliquely upwards placed from a hot gas inlet of the peripheral wall of the heavy object separating box, the hot smoke is upwards gushed on a planing plate climbing pipe section, the gushed hot smoke passes through a feeding nozzle, the hot smoke is placed into a roller dryer through a planing plate falling pipe section, and the hot smoke heats a pre-drying bent pipe and the roller dryer;
the feeding impurity separation predrying, wherein the planing plates led in by the feeding mouth are sprayed with hot flue gas to be dispersed, heavy impurities are separated from the planing plates to be settled and separated, and the dispersed planing plates overflow upwards and absorb the heat of the hot flue gas;
the material is dried, the pre-dried planing plate enters a roller dryer, hot flue gas is placed in the roller dryer, the roller dryer rolls the planing plate and drives the planing plate to move towards a discharge hole, the rolling planing plate is heated to overflow water, and the roller dryer discharges tail gas outwards;
reciprocating mixed gas drying, introducing part of tail gas discharged by the roller dryer into a mixing air chamber, mixing with hot smoke in the mixing air chamber, and obliquely and upwardly placing the mixed hot smoke into a planing climbing pipe section from a hot gas inlet of the peripheral wall of the heavy object separating box;
the feeding nozzle is provided with a feeding rotary valve, the feeding rotary valve comprises a shell and a rotating shaft, the rotating shaft is accommodated in the shell, scrapers are uniformly distributed on the circumference of the peripheral wall of the rotating shaft, and in the rotation of the rotating shaft, two adjacent scrapers buffer and transfer a part of planing plate; the utility model provides a heavy object separating valve of heavy object separator lower extreme includes barrel, spiral roller and separation motor, the feed inlet is seted up to the upper end at barrel middle part, and the lower extreme sets up the discharge gate, spiral roller holding is in the barrel, spiral roller's perisporium sets gradually normal spiral screw tooth and anti-spiral screw tooth along the axial, normal spiral screw tooth with interval between the anti-spiral screw tooth corresponds the feed inlet with the discharge gate, separation motor is suitable for the drive spiral roller.
Compared with the prior art, the beneficial effects of this application include: the hot air enters obliquely through the peripheral wall of the heavy object separating box, and then gushes upwards, the planing plates placed through the feeding nozzles are gushed by the hot air to be dispersed, heavy object impurities are separated from and hidden to be settled towards the lower port of the heavy object separating box, the heavy object impurities in the planing plates can be effectively removed, the requirements of outsourcing and recycling the planing plates are reduced, the raw material carefully selecting requirement is eliminated, the raw material purchasing cost is effectively reduced, the planing plates recycled in the upper production are substantially reused, the environment is protected, the energy is saved, the dispersed planing plates float upwards and are quickly and uniformly preheated, and the planing plates are uniformly heated; introducing external hot flue gas through the mixing air chamber, mixing partial tail gas (low-oxygen hot flue gas) discharged by the roller dryer, performing low-oxygen even anaerobic hot drying, avoiding ignition of the planing plate, and avoiding oxidation of the planing plate; the exhaust gas (low oxygen hot flue gas) mixed with the exhaust gas discharged by the roller dryer not only recycles the waste heat discharged by the roller dryer, but also adjusts the flue gas temperature of the mixing air chamber by using the exhaust gas which is relatively close to the internal temperature of the roller dryer, and a certain amount of hot moisture is regulated into the pre-dried planing plate to obtain a mixed gas which is low in oxygen and higher than the internal temperature of the roller dryer and has a certain amount of homogeneous moisture, the planing plate dispersed and sealed in the pre-drying bent pipe is pre-dried by the mixed gas, so that the planing plate temperature distribution is uniform, the temperature is more suitable for the internal temperature and the humidity distribution of the roller dryer to be more uniform (surface layer and inside), the heat utilization rate is higher, the drying can be performed more quickly and uniformly in the roller dryer in later period, the quality of the planing plate obtained by drying is better, and the planing plate press can keep stable production efficiency and product quality.
As an improvement of the technical scheme, the mixed air chamber extends along the left-right direction, the cavity of the mixed air chamber is cylindrical, the hot flue gas inlet and the mixed air outlet are respectively arranged at the left end and the right end of the mixed air chamber, the air return port is communicated with the mixed air chamber through the peripheral wall at the left end of the mixed air chamber, and the air return port is suitable for placing the mixed air chamber into flue gas discharged by the roller dryer along the tangential direction.
As an improvement of the technical scheme, the roller dryer further comprises a discharging box and a discharging fan, wherein the roller dryer is suitable for conveying the shaving board to the discharging box, the upper port of the discharging box is an outward suction port and is communicated with the discharging fan, and the lower port of the discharging box is a plate outlet
As the improvement of the technical scheme, the novel cyclone type discharging device further comprises a small drying cyclone and a pumping pipe, the head end of the pumping pipe is suitable for being communicated with the upper port of the discharging box, the discharging fan is arranged at the head end and/or the tail end of the pumping pipe, the small drying cyclone comprises a vertical outer cylinder and a vertical inner cylinder, the lower end of the vertical inner cylinder is inserted into the upper section of the vertical outer cylinder at the upper end of the vertical outer cylinder, so that the upper end of the vertical outer cylinder is closed, a circular gap is formed between the lower end of the vertical inner cylinder and the inner wall of the vertical outer cylinder, the pumping pipe is embedded into the peripheral wall part of the upper end of the vertical outer cylinder, an embedding part of the vertical outer cylinder is provided with a butt joint, the butt joint is communicated with the pumping pipe and is suitable for feeding along the circular gap in a tangential direction, the lower port of the vertical outer cylinder is a discharge port, and the upper port of the vertical inner cylinder is an air outlet.
As an improvement of the technical scheme, a plurality of small drying cyclones are arranged along the axial direction of the pumping pipe at intervals, and the small drying cyclones are arranged in a staggered mode from one side of the pumping pipe to the other side of the pumping pipe.
As an improvement of the above technical scheme, the drying device further comprises a crushed plate collecting and conveying belt, and the plurality of small drying cyclones are suitable for blanking to the crushed plate collecting and conveying belt.
As the improvement of above-mentioned technical scheme, the head end of pump row pipe has and is suitable for setting the corner of discharging the fan, the fan of discharging includes rotary drum, first mounting disc, second mounting disc and a plurality of blade, the through-hole is seted up to the axle core department of first mounting disc, the through-hole butt joint a port of rotary drum, a plurality of the blade is located between first mounting disc and the second mounting disc, just a plurality of the blade is around through-hole circumference equipartition, the blade is along curved skew the direction line of through-hole extends.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of an OSB particle board drying system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the pre-drying elbow configuration of the OSB particle board drying system of FIG. 1;
FIG. 3 is a schematic diagram of the mixing chamber structure of the OSB particle board drying system of FIG. 1;
FIG. 4 is a top view in half cross section of the mixing chamber shown in FIG. 3;
FIG. 5 is a schematic diagram of the weight separator tank structure of the OSB particle board drying system of FIG. 1;
FIG. 6 is a schematic diagram of the discharge portion of the OSB particle board drying system of FIG. 1;
FIG. 7 is a top view in section of the structure shown in FIG. 6;
FIG. 8 is a schematic diagram of a further embodiment of a discharge portion of an OSB particle board drying system;
FIG. 9 is a top view in section of the structure shown in FIG. 8;
FIG. 10 is a schematic diagram of a discharge fan;
fig. 11 is a partial structural schematic diagram of the discharge fan shown in fig. 10.
Pre-drying elbow pipe 100, planing climbing pipe section 110, feeding nozzle 111, reducing and accelerating forward spray pipe 112, planing falling pipe section 120, feeding rotary valve 130 and reducing and accelerating elbow pipe 140;
the weight separation tank 200, the hot gas inlet 210, the weight separation valve 220, the cylinder 221, the spiral roller 222, the positive spiral screw 222a, the negative spiral screw 222b, and the separation motor 223;
a drum dryer 300, a flue gas outlet 310, an outlet chimney 320;
a drying fan 400;
a mixing chamber 500, a hot flue gas inlet 510, a return air inlet 520, and a mixed gas outlet 530;
a discharge box 600, which pumps the suction port 610 outwards and discharges the plate 620;
a discharge fan 710, a rotating drum 711, a first mounting plate 712, a second mounting plate 713, vanes 714, and a suction pipe 720;
a small drying cyclone 800, a vertical outer cylinder 810, a butt joint 811, a vertical inner cylinder 820 and a ring-shaped gap 830;
the breaker plate gathers the conveyor belt 910 and discharges the conveyor belt 920.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, 2 and 5, the invention provides an OSB particle board drying system, which comprises a pre-drying elbow pipe 100, a weight separating box 200 and a roller dryer 300, wherein the pre-drying elbow pipe 100 comprises a planing climbing pipe section 110 and a planing falling pipe section 120, a feeding nozzle 111 is arranged on the peripheral wall of the lower end of the planing climbing pipe section 110, an upper port of the weight separating box 200 is communicated with a lower port of the planing climbing pipe section 110, a hot gas inlet 210 is arranged on the peripheral wall of the weight separating box 200, the hot gas inlet 210 is obliquely arranged from bottom to top, a weight separating valve 220 is arranged on the lower port of the weight separating box 200, a feeding port of the roller dryer 300 is communicated with a discharging port of the planing falling pipe section 120, a flue gas outlet 310 is arranged on the roller dryer 300, and the flue gas outlet 310 is communicated with a drying fan 400.
OSB particle board, oriented strand board, is a common general knowledge.
The heavy impurities hidden by outsourced and recovered planing plates are generally stone and metal.
Referring to fig. 1 and 2, the pre-dried elbow 100 includes a flight climbing pipe section 110 and a flight falling pipe section 120, so it is understood that the flight needs to rise and fall back in the present invention, and the upper ends of both the flight climbing pipe section 110 and the flight falling pipe section 120 are communicated.
The drum dryer 300 is a prior art, and mainly comprises a drum, a roller engaged with the drum, and a motor adapted to drive the roller to roll, wherein the roller is adapted to support and drive the drum, as described in the prior art documents such as CN2013104724845 and CN 2010101862924. CN201010186292.4 discloses a cylinder, and a shoveling plate/shoveling plate is additionally arranged. In the drum dryer 300 of the present invention, hot air blowing and drum up-casting are adopted to jointly drive the planing plate; specifically, the planing plate is supported by the inner wall of the roller, and the planing plate which is supported and/or overturned starts to move towards the discharge hole by being blown by hot air.
Compared with the prior art, the beneficial effects of this application include: the hot air enters obliquely through the peripheral wall of the heavy object separating box 200, and then upwards gushes out, the planing plates which are placed in the feeding mouth 111 are gushed out by the hot air to be dispersed, heavy object impurities are separated from and hidden to be settled towards the lower port of the heavy object separating box 200, the heavy object impurities in the planing plates can be effectively removed, the requirements of outsourced and recovered planing plates are reduced, the raw material carefully selecting requirement is eliminated, the raw material purchasing cost is effectively reduced, the planing plates recovered in the production are substantially reused, the environment is protected, the energy is saved, the dispersed planing plates overflow upwards and are rapidly and uniformly preheated, the planing plates are uniformly heated, the planing plates are uniformly and are uniformly distributed again due to the humidity of the planing plates which are fully sealed in the pre-drying bent pipe 100, the substantial drying time of the pre-drying even planing plates in the roller dryer 300 is sufficient, the heat utilization rate of the pre-drying planing plates is high, the pre-dried planing plates are nearly dried, the planing plates have a certain degree, and the water content of the planing plates is stabilized in a certain range, and the planing plate pressing machine maintains stable production efficiency and product quality; the lower port of the weight separation box 200 is plugged by the weight separation valve 220, and hot air flow in the planing plate climbing pipe section 110 is gushed from bottom to top at a relatively stable speed, so that weight separation and planing plate overflow are effectively ensured.
It will be appreciated that the tumble dryer 300 has an exhaust stack and that the baffles dispersed throughout the pre-drying elbow 100 appear to be "choked" in a predetermined space.
Referring to fig. 1, 3 and 4, in some embodiments of the present invention, the present invention further includes an exhaust stack 320 and a mixing air chamber 500, the exhaust stack 320 is provided with a drying fan 400, a lower end of the exhaust stack 320 is adapted to be communicated with the flue gas exhaust port 310, the mixing air chamber 500 is provided with a hot flue gas inlet 510, a return air port 520 and a mixed gas outlet 530, the return air port 520 is communicated with the exhaust stack 320 through a peripheral wall of the exhaust stack 320, the mixed gas outlet 530 is communicated with the hot gas inlet 210 of the heavy object separation tank 200, the hot flue gas inlet 510 is introduced toward the mixed gas outlet 530, and the mixed gas outlet 530 is communicated with the flue gas exhaust port 310.
An OSB particle board drying method comprising the steps of:
hot flue gas is prepared, the hot flue gas is obliquely upwards placed from a hot gas inlet 210 on the peripheral wall of the heavy object separation box 200, the hot flue gas is upwards sprayed on the planing and climbing pipe section 110, the spraying of the hot flue gas passes through the feeding nozzle 111, the hot flue gas is placed into the roller dryer 300 through the planing and falling pipe section 120, and the hot flue gas heats the pre-drying bent pipe 100 and the roller dryer 300;
the feeding impurity separation pre-drying, wherein the planing plates led in by the feeding mouth 111 are sprayed with hot flue gas to be dispersed, heavy impurities are separated from the planing plates to be settled and separated, and the dispersed planing plates overflow upwards and absorb the heat of the hot flue gas;
the material is dried, the pre-dried planing plate enters a roller dryer 300, hot flue gas is placed into the roller dryer 300, the roller dryer 300 rolls the planing plate and drives the planing plate to move towards a discharge hole, the rolling planing plate is heated to overflow water, and the roller dryer 300 discharges tail gas outwards;
the reciprocating mixed gas is dried, and the tail gas discharged from the drum dryer 300 is partially introduced into the mixing air chamber 500 and mixed with the hot smoke in the mixing air chamber 500, and the mixed hot smoke is obliquely and upwardly placed into the planing and climbing pipe section 110 from the hot gas inlet 210 of the peripheral wall of the heavy object separating box 200.
In the present invention, the exhaust gas (flue gas and moisture) generated by the drum dryer 300 is discharged from the outer flue gas chimney 320. In the invention, the mixed air chamber 500 is used for introducing external hot flue gas, performing low-oxygen or even anaerobic thermal drying, avoiding the ignition of the planing plate and avoiding the oxidation of the planing plate; the mixing air chamber 500 is even mixed with part of the exhaust gas (low-oxygen hot flue gas) discharged by the drum dryer 300, so that the waste heat discharged by the drum dryer 300 is recycled, the flue gas temperature of the mixing air chamber 500 is regulated by the exhaust gas which is relatively close to the internal temperature of the drum dryer 300, the recycled and mixed hot flue gas also avoids the ignition and oxidation of the planing plate, a certain amount of hot moisture is regulated into the pre-dried planing plate, the planing plate humidity distribution is more uniform (surface layer and internal), the drying can be performed more quickly and uniformly in the drum dryer 300 in the later period, and the quality of the planing plate obtained by drying is better.
Referring to fig. 3 and 4, in some embodiments of the present invention, the mixing chamber 500 extends in a left-right direction, the chamber of the mixing chamber 500 is cylindrical, the hot flue gas inlet 510 and the mixed gas outlet 530 are respectively disposed at the left end and the right end of the mixing chamber 500, the air return port 520 is communicated with the mixing chamber 500 at the peripheral wall of the left end of the mixing chamber 500, and the air return port 520 is adapted to place the flue gas discharged from the drum dryer 300 into the mixing chamber 500 in a tangential direction. In the invention, hot smoke tail gas is mixed in the stage of entering the mixing air chamber 500 at the beginning of external hot smoke, and the mixing of the hot smoke tail gas is rapid and sufficient; in addition, the hot smoke tail gas cuts into the hot smoke flow in the tangential direction, so that the hot smoke tail gas is mixed more quickly and fully and is uniform.
Referring to fig. 1 and 2, in some embodiments of the invention, the upper ends of both the plow-climbing pipe segment 110 and the plow-falling pipe segment 120 are in communication through a reduced diameter acceleration elbow 140; that is, the major diameter of the planed climbing pipe segment 110 is greater than the diameter-reduced speed-increasing elbow 140, and the major diameter of the planed falling pipe segment 120 is greater than the diameter-reduced speed-increasing elbow 140. In the invention, the planing plate at the position of the reducing speed-increasing bent pipe 140 is quickly sprayed to the planing plate falling pipe section 120, so that the planing plate passing rate and the planing plate passing speed are greatly improved, and the accumulation and the retention of the planing plate when the planing plate passes through the bent pipe at a low speed are avoided; in addition, the bent planing plates are sprayed to the diameter-expanded channel to be dispersed, the dispersed planing plates are placed into the roller dryer 300 to greatly improve the drying rate and the dryness, and the planing plates before bending are dispersed and pre-dried in the channel with larger caliber, so that the planing plates have more uniform heat and humidity in advance, and are quickly and uniformly dried in the roller dryer 300 in the later stage.
Referring to fig. 1 and 2, in some embodiments of the invention, the lower end of the flight climbing pipe segment 110 is provided as a reduced diameter speed-increasing forward nozzle 112, and the feed nozzle 111 is located above the reduced diameter speed-increasing forward nozzle 112; i.e., the main body of the planing climbing pipe section 110 is of a larger caliber, and the small part of the pipe section at the lower end is provided with a reducing speed increasing forward spray pipe 112. In the present invention, hot flue gas is introduced through the hot gas inlet 210 of the heavy object separating box 200, and is sprayed upwards at a higher speed through the diameter-reducing speed-increasing positive spray pipe 112, the materials (planing plates and possible heavy object impurities) introduced by the feeding mouth 111 are rapidly and sufficiently scattered by the higher speed hot flue gas, the heavy object impurities are separated from the hiding of the planing plates to settle, the planing plates are sprayed upwards to drift upwards, and the planing plates in the drift uniformly and rapidly absorb the heat of the hot flue gas.
Referring to fig. 1 and 2, in some embodiments of the present invention, the feeding nozzle 111 is provided with a feeding rotary valve 130, which plays a role of blocking, preventing hot flue gas from overflowing and wasting, preventing intake of external air, and effectively ensuring drying quality of the particle board. The feeding rotary valve 130 may include a housing and a rotary shaft, wherein through holes are formed on two sides of the housing, a through hole is formed in the middle of the rotary shaft, and the overlapping ratio of the through hole of the rotary shaft and the through hole of the housing determines the opening of the feeding rotary valve 130; the feeding rotary valve 130 may include a casing and a rotary shaft, where through holes are formed on two sides of the casing, the rotary shaft is accommodated in the casing, and scraping plates are uniformly distributed on the circumference of the peripheral wall of the rotary shaft, and during rotation of the rotary shaft, two adjacent scraping plates buffer and transfer a part of planing plate.
The drum dryer 300 may additionally be in communication with a hot gas supply.
In some practical use processes, heavy object impurities may have a certain retention at the discharge port of the heavy object separation box 200, and the heavy object impurities are larger and blocked at the discharge port. Referring to fig. 1 and 5, in some embodiments of the present invention, the weight separating valve 220 includes a cylinder 221, a spiral roller 222 and a separating motor 223, a feed port is formed at an upper end of a middle portion of the cylinder 221, a discharge port is formed at a lower end of the cylinder, the spiral roller 222 is accommodated in the cylinder 221, a circumferential wall of the spiral roller 222 is sequentially provided with a forward screw thread 222a and a reverse screw thread 222b in an axial direction, a space between the forward screw thread 222a and the reverse screw thread 222b corresponds to the feed port and the discharge port, and the separating motor 223 is adapted to drive the spiral roller 222. In the invention, the discharge hole of the weight separating box 200 is blocked to a large extent by the mode of the spiral roller 222, so that the overflow wind force obtained by planing is greatly ensured; in addition, the heavy object impurity is handled in the centering of positive and negative double helix, and the heavy object impurity is put out fast along falling line placed in the middle, and the heavy object impurity is difficult to be detained at the both ends of heavy object separating valve 220, and heavy object separator 200 can not set up the funnel portion, and the heavy object impurity of great size, irregular many edges and corners can be scraped by the screw thread and bite and refine, and then effectively separate out, like metal strip, many edges and stones.
In some arrangements of the present invention, the size of the gap between the forward screw thread 222a and the reverse screw thread 222b is established based on the general size of the heavy object impurities, and the heavy object impurities larger than the gap can be scraped and refined by the screw threads, and then fall down centrally, and the discharge port below the heavy object separating valve 220 can be set larger.
In some embodiments of the invention, the weight separator valve 220 is the aforementioned feed rotary valve structure.
Referring to fig. 1, 6 to 9, in some embodiments of the present invention, a discharge box 600 and a discharge fan 710 are further included, the drum dryer 300 is adapted to transfer the particle board to the discharge box 600, an upper port of the discharge box 600 is an outward suction port 610 and communicates with the discharge fan 710, and a lower port of the discharge box 600 is a board outlet 620. The OSB particle board drying method further comprises a discharging step. In the invention, negative pressure suction is carried out at the upper port of the discharge box 600, the dried planing plates which are put into the discharge box 600 are screened, the smashed plates are sucked away through the upper port, and the more complete/bigger planing plates are settled and output through self gravity; in addition, negative pressure suction is performed in the discharge box 600, not only to separate the crushed plates, but also to air cool the planing plate in a relatively closed dry environment, so that the planing plate is restored to room temperature and is not easy to get damp again. It will be appreciated that the planing plate is light after drying and is sufficient to draw the chippings away under less suction at negative pressure.
Referring to fig. 1, in some embodiments of the present invention, the drum dryer 300 transfers the particle board to the discharge bin 600 through the discharge conveyor 920, and one end of the discharge conveyor 920 and the planing plate carried thereby are adapted to block the discharge opening of the drum dryer 300, greatly reducing the additional overflow of hot flue gas; the other end of the discharging conveyor belt 920 and the planing plate carried by the discharging conveyor belt are suitable for plugging the feeding hole of the discharging box 600, so that negative pressure extraction of the crushed plates is effectively ensured. In the discharge box 600, as the flitch falls from the end of the discharge conveyor 920, the flitch is pulled away by the negative pressure.
In some embodiments of the present invention, the outfeed conveyor 920 is hollowed out. For the transmission belt, it can be understood that the two ends of the transmission belt are wound on corresponding belt wheels, and the belt wheels are in transmission connection with corresponding motors.
In some embodiments of the present invention, the lower end of the drum dryer 300 transfers the particle board to the discharge bin 600 through the discharge chute, and the discharge opening of the lower end of the drum dryer 300 is buried by the own planing plate.
Referring to fig. 1, 6 to 9, in some embodiments of the present invention, the drying apparatus further comprises a drying small cyclone 800 and a suction pipe 720, a head end of the suction pipe 720 is adapted to be communicated with an upper port of the discharge box 600, the discharge fan 710 is disposed at the head end and/or the tail end of the suction pipe 720, the drying small cyclone 800 comprises a vertical outer cylinder 810 and a vertical inner cylinder 820, a lower end of the vertical inner cylinder 820 is inserted into an upper section of the vertical outer cylinder 810 at an upper end of the vertical outer cylinder 810 so that the upper end of the vertical outer cylinder 810 is closed, a ring-shaped gap 830 is formed between a lower end of the vertical inner cylinder 820 and an inner wall of the vertical outer cylinder 810, a peripheral wall portion of the upper end of the vertical outer cylinder 810 is embedded in the suction pipe 720, an embedding portion of the vertical outer cylinder 810 is provided with a butt joint 811, the butt joint 811 is communicated with the suction pipe 720, and is adapted to feed to the ring-shaped gap 830 in a tangential direction, a lower port of the vertical outer cylinder 810 is a discharge port, and an upper port of the vertical inner cylinder 820 is an air outlet. In the present invention, the presence of the small drying cyclones 800 does not result in loss of the shredder plate separation of the discharge bin 600, but rather facilitates the pooling and sedimentation of the shredder plate.
During actual use, the discharge fan 710 may be disposed at the rear end of the suction pipe 720. Referring to fig. 6 to 9, in some embodiments of the present invention, the drying small cyclones 800 are provided in plurality, the plurality of drying small cyclones 800 are spaced apart along the axial direction of the suction pipe 720, and the plurality of drying small cyclones 800 are arranged in a staggered manner from one side of the suction pipe 720 to the other side. In the invention, a plurality of small drying cyclones 800 are arranged at the grading and dividing opening, small drying cyclones 800 at the head end of a pumping pipe 720 with larger initial crushing plate quantity are embedded into small and small butt-joint openings, large butt-joint openings are embedded into the tail end of the pumping pipe 720, and the crushing plates are graded and divided, each small drying cyclone 800 is placed into a crushing plate with a small body quantity, and each small drying cyclone 800 effectively plays roles of accumulation and sedimentation of the crushing plates in the capacity range.
Referring to fig. 1, in some embodiments of the present invention, a breaker plate collection conveyor 910 is further included, and the plurality of small drying cyclones 800 are adapted to blanking onto the breaker plate collection conveyor 910.
Referring to fig. 8 to 11, in some embodiments of the present invention, a corner adapted to be provided with a discharge fan 710 is provided at a head end of a suction pipe 720, the discharge fan 710 includes a drum 711, a first mounting plate 712, a second mounting plate 713, and a plurality of blades 714, a through hole is provided at a shaft core of the first mounting plate 712, the through hole is abutted against one port of the drum 711, the plurality of blades 714 are located between the first mounting plate 712 and the second mounting plate 713, and the plurality of blades 714 are uniformly distributed around a circumference of the through hole, and the blades 714 extend in an arc-shaped direction deviating from the through hole.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present invention should be covered in the scope of the technical solution of the present invention.
Claims (4)
1. A method for drying OSB particle board, comprising the steps of:
preparing hot smoke, wherein the hot smoke is obliquely upwards placed into a heavy object separating box (200) from a hot gas inlet (210) at the peripheral wall, the hot smoke is upwards sprayed on a planing climbing pipe section (110), the spraying of the hot smoke passes through a feeding nozzle (111), the hot smoke is placed into a roller dryer (300) through a planing falling pipe section (120), and the hot smoke heats a pre-drying bent pipe (100) and the roller dryer (300);
the feeding impurity separation pre-drying, wherein the planing plates led in by the feeding mouth (111) are sprayed with hot flue gas to be dispersed, heavy impurities are separated from the planing plates to be settled and separated, and the dispersed planing plates float upwards and absorb the heat of the hot flue gas;
the method comprises the steps of substantially drying, enabling the pre-dried planing plates to enter a roller dryer (300), placing hot flue gas into the roller dryer (300), rolling the planing plates of the roller dryer (300) and driving the planing plates to move towards a discharge hole, heating the rolling planing plates to overflow water, and discharging tail gas outwards by the roller dryer (300);
the reciprocating mixed gas is dried, the tail gas discharged by the roller dryer (300) is partially led into a mixing air chamber (500) and is mixed with hot smoke in the mixing air chamber (500), and the hot smoke obtained by mixing is obliquely and upwards put into a planing climbing pipe section (110) from a hot gas inlet (210) on the peripheral wall of the heavy object separating box (200);
the feeding nozzle (111) is provided with a feeding rotary valve (130), the feeding rotary valve (130) comprises a shell and a rotating shaft, the rotating shaft is accommodated in the shell, scrapers are uniformly distributed on the circumference of the peripheral wall of the rotating shaft, and in the rotation of the rotating shaft, two adjacent scrapers buffer and transfer one planing plate; the heavy object separating valve (220) at the lower end of the heavy object separating box (200) comprises a barrel (221), a spiral roller (222) and a separating motor (223), wherein a feeding hole is formed in the upper end of the middle of the barrel (221), a discharging hole is formed in the lower end of the middle of the barrel, the spiral roller (222) is contained in the barrel (221), a positive spiral screw tooth (222 a) and a negative spiral screw tooth (222 b) are sequentially arranged on the peripheral wall of the spiral roller (222) along the axial direction, the interval between the positive spiral screw tooth (222 a) and the negative spiral screw tooth (222 b) corresponds to the feeding hole and the discharging hole, and the separating motor (223) is suitable for driving the spiral roller (222);
the roller dryer (300) is suitable for conveying the shaving board to the discharging box (600), an upper port of the discharging box (600) is an outward suction port (610) and is communicated with the discharging fan (710), and a lower port of the discharging box (600) is a board outlet (620);
the drying device comprises a discharging box (600), and is characterized by further comprising a drying small cyclone (800) and a pumping pipe (720), wherein the head end of the pumping pipe (720) is suitable for being communicated with the upper port of the discharging box (600), a discharging fan (710) is arranged at the head end and/or the tail end of the pumping pipe (720), the drying small cyclone (800) comprises a vertical outer cylinder (810) and a vertical inner cylinder (820), the lower end of the vertical inner cylinder (820) is inserted into the upper section of the vertical outer cylinder (810) at the upper end of the vertical outer cylinder (810) to enable the upper end of the vertical outer cylinder (810) to be closed, a circular gap (830) is formed between the lower end of the vertical inner cylinder (820) and the inner wall of the vertical outer cylinder (810), the peripheral wall part of the upper end of the vertical outer cylinder (810) is embedded into the pumping pipe (720), an embedding part of the vertical outer cylinder (810) is provided with an opposite interface (811), the opposite interface (811) is communicated with the pumping pipe (720), the upper end of the vertical inner cylinder (810) is suitable for being a vertical air outlet (820), and the vertical air outlet (810) is provided with the upper air outlet port; the small drying cyclones (800) are arranged in a plurality, the small drying cyclones (800) are arranged at intervals along the axial direction of the pumping pipe (720), and the small drying cyclones (800) are arranged in a staggered mode from one side of the pumping pipe (720) to the other side.
2. The OSB particle board drying method according to claim 1, wherein the mixing air chamber (500) extends in a left-right direction, the chamber of the mixing air chamber (500) is cylindrical, the hot flue gas inlet (510) and the mixed air outlet (530) are respectively disposed at the left end and the right end of the mixing air chamber (500), the air return opening (520) is communicated with the mixing air chamber (500) at the peripheral wall of the left end of the mixing air chamber (500), and the air return opening (520) is suitable for placing flue gas discharged by the drum dryer (300) into the mixing air chamber (500) along a tangential direction.
3. The OSB particle board drying method of claim 1, further comprising a board collection conveyor (910), the plurality of small drying cyclones (800) being adapted to blanking onto the board collection conveyor (910).
4. A OSB particle board drying method as claimed in claim 1 or 3, characterized in that the head end of the suction pipe (720) is provided with a corner adapted to be provided with the discharge fan (710), the discharge fan (710) comprises a drum (711), a first mounting plate (712), a second mounting plate (713) and a plurality of blades (714), a through hole is provided at the shaft core of the first mounting plate (712), the through hole is abutted to one port of the drum (711), the plurality of blades (714) are located between the first mounting plate (712) and the second mounting plate (713), and the plurality of blades (714) are uniformly distributed around the circumference of the through hole, and the blades (714) extend along an arc-shaped direction line deviating from the through hole.
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