CN118242871A - Wood shavings drying production system and drying method thereof - Google Patents

Abstract

The invention discloses a wood shavings drying production system, which comprises a boiler, a mixing chamber, a primary separation mechanism, a preheating mechanism, a wood shavings dryer, a blanking mechanism, a secondary separation mechanism and an exhaust chimney, wherein the boiler is connected with an air inlet of the mixing chamber; the air outlet of the mixing chamber is connected with a pipeline of the primary separation mechanism, and a conical cut-off valve is arranged on the air outlet of the mixing chamber; the top of the primary separation mechanism is connected with an air inlet pipeline of the preheating mechanism through an air outlet; the preheating mechanism is provided with a feed inlet and a discharge outlet, the feed inlet is connected with the wood shaving blanking device, and the discharge outlet is connected with the feed inlet of the wood shaving dryer; the discharging hole of the wood shaving dryer is connected with a blanking mechanism; the air outlet of the blanking mechanism is connected with the air inlet pipeline of the secondary separation mechanism; the top of the secondary separation mechanism is connected with an exhaust chimney and an air inlet pipeline of the mixing chamber through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism. The invention also discloses a drying method thereof, which comprises the following steps: the method comprises the steps of (1) air door setting, (2) system preheating, (3) drying and (4) flue gas treatment. The invention can effectively dry the wood shavings, has high heat efficiency, energy conservation and environmental protection, and has good drying effect.

Description

Wood shavings drying production system and drying method thereof

Technical Field

The invention belongs to the technical field of wood shaving drying equipment, and particularly relates to a wood shaving drying production system and a drying method thereof.

Background

The shaving board is made up of wood, bamboo, saw dust, leftover bits and pieces, etc. through such technological steps as drying, stirring, and pressing at a certain temp.

In the process of preparing the shaving board, the drying of the shavings is one of the main key processes for determining the quality of the board. The existing wood shavings drying equipment is low in heat efficiency, boiler flue gas cannot be treated, impurities in the flue gas affect wood shavings drying, accordingly product quality after drying is affected, wood shavings with different humidity are mixed and dried, drying quality is affected, the flue gas cannot be recycled, and energy waste is caused.

Chinese patent (publication No. CN 217953034U) discloses a drying system for particle boards, the pre-drying elbow comprises a planing climbing pipe section and a planing falling pipe section, the peripheral wall of the lower end of the planing climbing pipe section is provided with a feeding nozzle, the upper port of the heavy object separating box is communicated with the lower port of the planing climbing pipe section, the peripheral wall of the heavy object separating box is provided with a hot air inlet, the hot air inlet is obliquely arranged from bottom to top for air intake, the lower port of the heavy object separating box is provided with a heavy object separating valve, the feeding port of the roller dryer is communicated with the discharging port of the planing falling pipe section, the roller dryer is provided with a flue gas external discharge port, and the flue gas external discharge port is communicated with a drying fan. The substantial drying time and the heat utilization rate of the planing plate in the roller dryer are improved, so that the water content of the planing plate is stabilized in a certain range, and the planing plate press is kept stable in production efficiency and product quality; heavy impurities in the planing plate can be effectively removed, the requirement of outsourcing and recycling the planing plate is reduced, and the raw material purchasing cost is effectively reduced.

The Chinese patent (publication No. CN 207635816U) discloses a novel biomass wood shaving composite drying device, which comprises a single-channel dryer, a wood shaving blanking box and a low-temperature dryer; the low-temperature dryer heats the raw wet wood shavings by using the 111 ℃ high-temperature waste gas discharged by the single-channel dryer, so that the temperature of the high-temperature waste gas can be reduced from 111 ℃ to below 81 ℃, 41% waste of waste gas heat extraction is reduced, and meanwhile, a water spraying and cooling link in the subsequent flue gas purification is reduced, and the water consumption is saved; the original wet shavings can absorb the particles in the high-temperature waste gas of part of the single-channel dryer, so that the treatment load of a subsequent waste gas dust removal system is reduced, and the running cost is further reduced; because the original wet shavings have different water contents, the moisture contents of the obtained semi-wet shavings are consistent after the original wet shavings pass through a low-temperature dryer, and then the VOC is reduced when the original wet shavings are dried in a single-channel dryer.

The technical scheme has the technical problems of low heat efficiency, low energy utilization rate and low drying quality.

Disclosure of Invention

The invention aims to provide a wood shaving drying production system and a drying method thereof, which are used for solving the technical problems in the background technology.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The utility model provides a wood shavings drying production system, includes boiler, mixing chamber, one-level separating mechanism, preheats mechanism, wood shavings desiccator, blanking mechanism, second grade separating mechanism, exhaust stack, its characterized in that: the boiler is connected with the air inlet of the mixing chamber; the air outlet of the mixing chamber is connected with the pipeline of the primary separation mechanism, and a conical cut-off valve is arranged on the air outlet of the mixing chamber; the top of the primary separation mechanism is connected with an air inlet pipeline of the preheating mechanism through an air outlet, and the bottom of the primary separation mechanism is provided with a discharge hole; the preheating mechanism is provided with a feed inlet and a discharge outlet, the feed inlet is connected with the wood shaving blanking device, and the discharge outlet is connected with the feed inlet of the wood shaving dryer; the discharging hole of the wood shaving dryer is connected with the blanking mechanism; the air outlet of the blanking mechanism is connected with the air inlet pipeline of the secondary separation mechanism, and the bottom of the blanking mechanism is provided with a discharge hole; the top of the secondary separation mechanism is connected with an exhaust chimney and an air inlet pipeline of the mixing chamber respectively through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism.

Further, the preheating mechanism is an omega heating pipe; the left part of the omega heating pipe is a wet wood shaving preheating section, a wet wood shaving feeding port is arranged on the wet wood shaving preheating section and is connected with a wet wood shaving blanking device, the right part of the omega heating pipe is a semi-dry wood shaving preheating section, and a semi-dry wood shaving feeding port is arranged on the semi-dry wood shaving preheating section and is connected with the semi-dry wood shaving blanking device.

Further, the blanking mechanism comprises a blanking box, a first conveyor and a dry wood shaving blanking device; the left side of the blanking box is provided with a feeding hole, the blanking box is connected with a discharging hole of the wood shaving dryer, the right side of the blanking box is provided with an air outlet, the blanking box is connected with an air inlet pipeline of the secondary separation mechanism, and the bottom of the blanking box is provided with the discharging hole; the first conveyor is arranged below a discharge hole of the blanking box; the discharging device is arranged at the discharging end of the first conveyor, and the bottom end of the discharging device is provided with a dry material outlet and a waste material outlet.

Further, the device also comprises a second conveyor; the second conveyor is arranged below the discharge port of the second separation mechanism.

Further, an induced draft fan is arranged on an air outlet pipe of the secondary separation mechanism.

Further, the primary separation mechanism is formed by connecting a plurality of primary cyclone separators in parallel; the secondary separation mechanism is formed by connecting a plurality of secondary cyclone separators in parallel.

Further, a chimney circulation air door is arranged on a connecting pipeline of the secondary separation mechanism and the exhaust chimney; and flue gas circulating air doors are arranged on the connecting pipelines of the secondary separation mechanism and the mixing chamber.

Further, the wood shaving dryer is a single-channel wood shaving dryer.

A drying method of a wood shavings drying production system, comprising the following steps:

(1) And (3) air door setting: before starting, closing a cold air door of the boiler; closing a main air door on an air inlet of the mixing chamber, and opening a smoke circulating air door, wherein the opening of the smoke circulating air door is more than 50%, and the opening of a chimney circulating air door is less than 5%;

(2) Preheating a system: starting a boiler, introducing the flue gas into the mixing chamber by the boiler, fully opening a conical cut-off valve of the mixing chamber, gradually opening a main air door of the mixing chamber, and introducing the flue gas generated by the boiler into a system for preheating; when the feeding port of the wood shaving dryer reaches a certain temperature, continuously increasing the opening of the main air door, and ensuring that the opening of the air door is more than or equal to 50% before feeding;

(3) And (3) drying: when the feeding temperature of the wood shaving dryer reaches a certain temperature, starting the semi-dry wood shaving blanking device, and starting the wet wood shaving blanking device at a lower feeding speed; according to the wood shavings drying requirement, gradually increasing the temperature of the flue gas through the mixing chamber so as to adjust the feeding temperature of the wood shavings dryer and simultaneously increasing the feeding speed of the wet wood shavings feeder; the method comprises the steps of adjusting the feeding speed and the opening of a chimney circulation air door, adjusting the discharging temperature of a wood shaving dryer, preheating wet wood shavings and semi-dry wood shavings in an omega heating pipe, drying the wet wood shavings and the semi-dry wood shavings in the wood shaving dryer together with flue gas, conveying the wood shavings to a blanking box after the drying is finished, conveying the wood shavings to a blanking device through a first conveyor, and separating and respectively collecting the dry wood shavings and waste materials by the blanking device;

(4) Flue gas treatment: the flue gas is discharged from the gas outlet of the mixing chamber, smoke dust and sparks in the flue gas are removed through a first-stage separation mechanism, the smoke dust is discharged, the treated flue gas enters an omega heating pipe and a wood shaving dryer and then is sent into a second-stage separation mechanism, the second-stage separation mechanism carries out second-stage separation on the flue gas, fine wood shavings in the flue gas are separated and discharged, and the flue gas is transported and collected through a second conveyor; after the secondary separation, part of the flue gas is sent into an exhaust chimney through an induced draft fan to be discharged, and the other part of the flue gas is sent into a mixing chamber to be recycled.

Further, in the step (3), the temperature of the flue gas is increased to 400-450 ℃ by the mixer; the feeding temperature of the wood shaving dryer is 250-350 ℃, and the discharging temperature is 110-130 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1. In the drying production system, the equipment such as a boiler, a mixing chamber, a primary separation mechanism, a preheating mechanism, a wood shaving dryer, a blanking mechanism, a secondary separation mechanism and the like are arranged, and the mixing chamber is used for carrying out mixed heating on flue gas in the boiler; the primary separation mechanism can remove smoke dust and sparks in the smoke, reduce impurity and fire probability of a drying system and eliminate influence on subsequent procedures; the preheating mechanism preheats materials with different water contents by arranging the omega heating pipe, so that the moisture content of wet shavings and semi-dry shavings can be consistent before drying, the drying effect is ensured to be uniform, and the drying quality of products is improved; drying the preheated materials by the wood shaving dryer, and collecting the materials by a blanking mechanism; the secondary separation mechanism can separate fine materials in the flue gas again, so that the product yield is improved, and the production cost is reduced. The drying effect is good, the safety is high, and the application scene is good.

2. According to the invention, the dried flue gas is divided into two paths, one path is discharged through the exhaust chimney, and the other path is re-entered into the mixing chamber for recycling, so that the energy utilization rate is high, the heat efficiency is high, and the energy conservation and the environmental protection are realized.

3. In the drying method, the opening of each equipment air door is set to ensure the inlet amount of the flue gas; the system can guarantee the normal work of the system by preheating, and the drying efficiency is improved. During drying, the feeding temperature of the wood shaving dryer is adjusted through the mixing chamber, and the discharging temperature of the wood shaving dryer is adjusted through adjusting the feeding speed or increasing the opening of the smoke circulating air door or the chimney circulating air door, so that the wood shaving dryer is suitable for different water content requirements, and is simple to operate and flexible to use.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

in the drawings, 1-boiler;

2-a mixing chamber; 21-a conical shut-off valve;

3-a primary separation mechanism; 31-a primary cyclone separator;

4-a preheating mechanism; 41-omega heating tube; 42-wet wood shavings blanking device; 43-semi-dry wood shavings blanking device;

5-wood shavings dryer;

6-blanking mechanism; 61-blanking box; 62-a first transporter; 63-blanking the dried shavings;

7-a secondary separation mechanism; 71-two-stage cyclone separator; 72-a second conveyor;

8-an exhaust stack;

9-induced draft fan; 10-a chimney circulation air door; 11-flue gas circulation damper.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.

The wood shavings drying production system comprises a boiler 1, a mixing chamber 2, a primary separation mechanism 3, a preheating mechanism 4, a wood shavings dryer 5, a blanking mechanism 6, a secondary separation mechanism 7 and an exhaust chimney 8, wherein the boiler 1 is connected with an air inlet of the mixing chamber 2; the air outlet of the mixing chamber 2 is connected with the pipeline of the primary separation mechanism 3, the mixing chamber 2 uniformly and fully mixes high-temperature flue gas from the boiler 1 and circulating flue gas to reach the temperature required by the wood shaving drying process, the air outlet of the mixing chamber 2 is provided with a conical cut-off valve 21, the system is opened during normal operation, and the valve is closed to cut off the heat source supply under the special conditions of emergency or cutting off the heat source and the like, so that the safety performance of the system is improved; the top of the primary separation mechanism 3 is connected with an air inlet pipeline of the preheating mechanism 4 through an air outlet, a discharge hole is formed in the bottom of the primary separation mechanism 3, the primary separation mechanism 3 is used for removing smoke dust and sparks in smoke, reducing the impurity and fire probability of a drying system and eliminating the influence on subsequent procedures; the preheating mechanism 4 is provided with a feed inlet and a discharge outlet, the feed inlet is used for feeding wood shavings, and the discharge outlet is connected with the feed inlet of the wood shavings dryer 5; the discharging hole of the wood shaving dryer 5 is connected with a blanking mechanism 6; the air outlet of the blanking mechanism 6 is connected with the air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking mechanism 6 is provided with a discharge hole; the top of the secondary separation mechanism 7 is respectively connected with an exhaust chimney 8 and an air inlet pipeline of the mixing chamber 2 through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism 7; the secondary separation mechanism 7 separates fine materials in the flue gas.

The preheating mechanism 4 is an omega heating pipe 41; the left part of the omega heating pipe 41 is a wet wood chip preheating section, a wet wood chip feeding port is arranged on the wet wood chip preheating section and is connected with a wet wood chip blanking device 42, the right part of the omega heating pipe 41 is a semi-dry wood chip preheating section, and a semi-dry wood chip feeding port is arranged on the semi-dry wood chip preheating section and is connected with a semi-dry wood chip blanking device 43. The initial shavings are divided into wet shavings and semi-dry shavings according to the different water contents, and the drying effect is not uniform if the shavings are directly mixed and dried, so that the wet shavings and the semi-dry shavings are preheated through the omega heating pipe 41, the moving strokes of the wet shavings and the semi-dry shavings in the omega heating pipe 41 are different, the moving strokes of the wet shavings are longer, the preheating time of the wet shavings is longer, the similar water contents of the wet shavings and the semi-dry shavings are obtained before the wet shavings and the semi-dry shavings enter the shavings dryer 5, and the subsequent non-uniform drying effect is prevented; the omega heating pipe 41 is internally provided with a weight feeder which is connected with the left bottom of the omega heating pipe 41 and is used for removing impurities in shavings.

The blanking mechanism 6 comprises a blanking box 61, a first conveyor 62 and a dry wood shaving blanking device 63; the left side of the blanking box 61 is provided with a feeding hole, is connected with a discharging hole of the wood shaving dryer 5, the right side of the blanking box is provided with an air outlet, is connected with an air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking box is provided with a discharging hole; the first conveyor 62 is arranged below the discharge port of the blanking box 61; the dry wood shaving blanking device 63 is arranged at the discharging end of the first conveyor 62, and a dry material outlet and a waste material outlet are arranged at the bottom end of the dry wood shaving blanking device 63; the dried shavings enter the blanking box 61 and are transported into the dry shavings blanking device 63 by the first conveyor 62, and the dry shavings blanking device 63 separates and collects the dry shavings and the waste materials respectively.

A conveyor number two 72; the second conveyor 72 is arranged below a discharge hole of the second separation mechanism 7, the second separation mechanism 7 separates fine shavings in the smoke, and then the fine shavings are discharged to the second conveyor 72 through the discharge hole, and the second conveyor 72 conveys and collects the fine shavings.

An induced draft fan 9 is arranged on an air outlet pipe of the secondary separation mechanism 7 and is used for providing power for the movement of the smoke.

The primary separation mechanism 3 is formed by connecting a plurality of primary cyclone separators 31 in parallel; the secondary separation mechanism 7 is formed by connecting a plurality of secondary cyclone separators 71 in parallel.

A chimney circulation air door 10 is arranged on a connecting pipeline of the secondary separation mechanism 7 and the exhaust chimney 8; the connecting pipeline of the secondary separation mechanism 7 and the mixing chamber 2 is provided with a smoke circulating air door 11, and the circulating air door is used for adjusting the discharge amount or the circulating amount of smoke and can be used for adjusting the discharge temperature of the wood shaving dryer 5.

The wood shavings dryer 5 is a single-channel wood shavings dryer.

A drying method of a wood shavings drying production system, comprising the following steps:

(1) And (3) air door setting: before starting, closing a cold air door of the boiler 1; closing a main air door on an air inlet of the mixing chamber 2, and opening a smoke circulating air door 11, wherein the opening of the smoke circulating air door is more than 50%, and the opening of a chimney circulating air door 10 is less than 5%;

(2) Preheating a system: starting the boiler 1, introducing the flue gas into the mixing chamber 2 by the boiler 1, fully opening a conical cut-off valve 21 of the mixing chamber 2, gradually opening a main air door of the mixing chamber 2, and introducing the flue gas generated by the boiler 1 into a system for preheating; when the feeding port of the wood shaving dryer 5 reaches 100 ℃, continuously increasing the opening of a main air door, and ensuring that the opening of the air door is more than or equal to 50% before feeding;

(3) And (3) drying: when preheating to the feeding temperature of the shavings dryer 5 reaching 145 ℃, starting the semi-dry shavings blanking device 43 and then starting the wet shavings blanking device 42 at a lower feeding speed; according to the wood shavings drying requirement, gradually increasing the temperature of the flue gas to 400-450 ℃ through the mixing chamber 2so as to adjust the feeding temperature of the wood shavings dryer 5 to 250-350 ℃ and simultaneously increasing the feeding speed of the wet wood shavings blanking device 42; the temperature of the discharged material of the wood shaving dryer 5 is adjusted to be 110-130 ℃ by adjusting the feeding speed or increasing the opening of the smoke circulation air door 11 or the chimney circulation air door 10, and when the temperature of the discharged material of the wood shaving dryer 5 has a trend of rising, the feeding amount of the wood shaving can be increased or the opening of the smoke circulation air door 11 or the chimney circulation air door 10 can be increased so as to increase heat consumption or reduce heat entering a drying system to balance the temperature of the discharged material; when the discharging temperature of the dry wood shavings dryer 5 has a decreasing trend, the feeding amount of wood shavings can be correspondingly reduced or the opening of the smoke circulation air door 11 or the opening of the chimney circulation air door 10 can be correspondingly reduced, so that the heat consumption can be reduced or the heat entering the drying system can be increased to balance the discharging temperature; after being preheated in the omega heating pipe 41, the wet shavings and the semi-dry shavings enter the shavings dryer 5 along with the flue gas to be dried, after the drying, the shavings are conveyed into the blanking box 61 and conveyed into the dry shavings blanking device 63 through the first conveyor 62, and the dry shavings blanking device 63 separates and collects the dry shavings and the waste materials respectively;

(4) Flue gas treatment: after the flue gas is discharged from the gas outlet of the mixing chamber 2, the flue gas passes through the first-stage separation mechanism 3 to remove smoke dust and sparks in the flue gas, the smoke dust is discharged, the treated flue gas enters the omega heating pipe 41 and the wood shaving dryer 5 and then is sent into the second-stage separation mechanism 7, the second-stage separation mechanism 7 carries out second-stage separation on the flue gas, and fine wood shavings in the flue gas are separated and discharged and are transported away and collected through the second conveyor 72; after the secondary separation, part of the flue gas is sent into an exhaust chimney 8 to be discharged through an induced draft fan 9, and the other part of the flue gas is sent into the mixing chamber 2 to be recycled.

The following description will proceed with more specific embodiments

Example 1

The wood shavings drying production system comprises a boiler 1, a mixing chamber 2, a primary separation mechanism 3, a preheating mechanism 4, a wood shavings dryer 5, a blanking mechanism 6, a secondary separation mechanism 7 and an exhaust chimney 8, wherein the boiler 1 is connected with an air inlet of the mixing chamber 2; the air outlet of the mixing chamber 2 is connected with the pipeline of the primary separation mechanism 3, and a conical cut-off valve 21 is arranged on the air outlet of the mixing chamber 2; the top of the primary separation mechanism 3 is connected with an air inlet pipeline of the preheating mechanism 4 through an air outlet, and a discharge hole is formed in the bottom of the primary separation mechanism 3; the preheating mechanism 4 is provided with a feed inlet and a discharge outlet, the feed inlet is connected with a shaving blanking device, and the discharge outlet is connected with a feed inlet of a shaving dryer 5; the discharging hole of the wood shaving dryer 5 is connected with a blanking mechanism 6; the air outlet of the blanking mechanism 6 is connected with the air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking mechanism 6 is provided with a discharge hole; the top of the secondary separation mechanism 7 is respectively connected with an exhaust chimney 8 and an air inlet pipeline of the mixing chamber 2 through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism 7.

The preheating mechanism 4 is an omega heating pipe 41; the left part of the omega heating pipe 41 is a wet wood chip preheating section, a wet wood chip feeding port is arranged on the wet wood chip preheating section and is connected with a wet wood chip blanking device 42, the right part of the omega heating pipe 41 is a semi-dry wood chip preheating section, and a semi-dry wood chip feeding port is arranged on the semi-dry wood chip preheating section and is connected with a semi-dry wood chip blanking device 43.

The blanking mechanism 6 comprises a blanking box 61, a first conveyor 62 and a dry wood shaving blanking device 63; the left side of the blanking box 61 is provided with a feeding hole, is connected with a discharging hole of the wood shaving dryer 5, the right side of the blanking box is provided with an air outlet, is connected with an air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking box is provided with a discharging hole; the first conveyor 62 is arranged below the discharge port of the blanking box 61; the dry wood shaving feeder 63 is arranged at the discharge end of the first conveyor 62, and a dry material outlet and a waste material outlet are arranged at the bottom end of the dry wood shaving feeder 63.

A conveyor number two 72; the second conveyor 72 is arranged below the discharge hole of the second-stage separation mechanism 7.

An induced draft fan 9 is arranged on the air outlet pipe of the secondary separation mechanism 7.

The primary separation mechanism 3 is formed by connecting a plurality of primary cyclone separators 31 in parallel; the secondary separation mechanism 7 is formed by connecting a plurality of secondary cyclone separators 71 in parallel.

A chimney circulation air door 10 is arranged on a connecting pipeline of the secondary separation mechanism 7 and the exhaust chimney 8; and a flue gas circulating air door 11 is arranged on the connecting pipeline of the secondary separation mechanism 7 and the mixing chamber 2.

The wood shavings dryer 5 is a single-channel wood shavings dryer.

A drying method of a wood shavings drying production system, comprising the following steps:

(1) And (3) air door setting: before starting, closing a cold air door of the boiler 1; closing a main air door on an air inlet of the mixing chamber 2, and opening a smoke circulating air door 11, wherein the opening of the smoke circulating air door is more than 50%, and the opening of a chimney circulating air door 10 is less than 5%;

(2) Preheating a system: starting the boiler 1, introducing the flue gas into the mixing chamber 2 by the boiler 1, fully opening a conical cut-off valve 21 of the mixing chamber 2, gradually opening a main air door of the mixing chamber 2, and introducing the flue gas generated by the boiler 1 into a system for preheating; when the feeding port of the wood shaving dryer 5 reaches 100 ℃, continuously increasing the opening of a main air door, and ensuring that the opening of the air door is more than or equal to 50% before feeding;

(3) And (3) drying: when preheating to the feeding temperature of the shavings dryer 5 reaching 145 ℃, starting the semi-dry shavings blanking device 43 and then starting the wet shavings blanking device 42 at a lower feeding speed; according to the wood shavings drying requirement, the temperature of the flue gas is gradually increased to 450 ℃ through the mixing chamber 2 so as to adjust the feeding temperature of the wood shavings dryer 5 to 300 ℃, and simultaneously, the feeding speed of the wet wood shavings feeder 42 is increased; the discharging temperature of the shavings dryer 5 is adjusted to 120 ℃ by adjusting the feeding speed or increasing the opening of the smoke circulation air door 11 or the chimney circulation air door 10, the wet shavings and the semi-dry shavings enter the shavings dryer 5 along with smoke to be dried after being preheated in the omega heating pipe 41, the shavings are conveyed into the blanking box 61 after being dried and conveyed into the dry shavings blanking device 63 through the first conveyor 62, and the dry shavings blanking device 63 separates and collects the dry shavings and the waste materials respectively;

(4) Flue gas treatment: after the flue gas is discharged from the gas outlet of the mixing chamber 2, the flue gas passes through the first-stage separation mechanism 3 to remove smoke dust and sparks in the flue gas, the smoke dust is discharged, the treated flue gas enters the omega heating pipe 41 and the wood shaving dryer 5 and then is sent into the second-stage separation mechanism 7, the second-stage separation mechanism 7 carries out second-stage separation on the flue gas, and fine wood shavings in the flue gas are separated and discharged and are transported away and collected through the second conveyor 72; after the secondary separation, part of the flue gas is sent into an exhaust chimney 8 to be discharged through an induced draft fan 9, and the other part of the flue gas is sent into the mixing chamber 2 to be recycled.

Example 2

The wood shavings drying production system comprises a boiler 1, a mixing chamber 2, a primary separation mechanism 3, a preheating mechanism 4, a wood shavings dryer 5, a blanking mechanism 6, a secondary separation mechanism 7 and an exhaust chimney 8, wherein the boiler 1 is connected with an air inlet of the mixing chamber 2; the air outlet of the mixing chamber 2 is connected with the pipeline of the primary separation mechanism 3, and a conical cut-off valve 21 is arranged on the air outlet of the mixing chamber 2; the top of the primary separation mechanism 3 is connected with an air inlet pipeline of the preheating mechanism 4 through an air outlet, and a discharge hole is formed in the bottom of the primary separation mechanism 3; the preheating mechanism 4 is provided with a feed inlet and a discharge outlet, the feed inlet is connected with a shaving blanking device, and the discharge outlet is connected with a feed inlet of a shaving dryer 5; the discharging hole of the wood shaving dryer 5 is connected with a blanking mechanism 6; the air outlet of the blanking mechanism 6 is connected with the air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking mechanism 6 is provided with a discharge hole; the top of the secondary separation mechanism 7 is respectively connected with an exhaust chimney 8 and an air inlet pipeline of the mixing chamber 2 through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism 7.

The preheating mechanism 4 is an omega heating pipe 41; the left part of the omega heating pipe 41 is a wet wood chip preheating section, a wet wood chip feeding port is arranged on the wet wood chip preheating section and is connected with a wet wood chip blanking device 42, the right part of the omega heating pipe 41 is a semi-dry wood chip preheating section, and a semi-dry wood chip feeding port is arranged on the semi-dry wood chip preheating section and is connected with a semi-dry wood chip blanking device 43.

The blanking mechanism 6 comprises a blanking box 61, a first conveyor 62 and a dry wood shaving blanking device 63; the left side of the blanking box 61 is provided with a feeding hole, is connected with a discharging hole of the wood shaving dryer 5, the right side of the blanking box is provided with an air outlet, is connected with an air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking box is provided with a discharging hole; the first conveyor 62 is arranged below the discharge port of the blanking box 61; the dry wood shaving feeder 63 is arranged at the discharge end of the first conveyor 62, and a dry material outlet and a waste material outlet are arranged at the bottom end of the dry wood shaving feeder 63.

A conveyor number two 72; the second conveyor 72 is arranged below the discharge hole of the second-stage separation mechanism 7.

An induced draft fan 9 is arranged on the air outlet pipe of the secondary separation mechanism 7.

The primary separation mechanism 3 is formed by connecting a plurality of primary cyclone separators 31 in parallel; the secondary separation mechanism 7 is formed by connecting a plurality of secondary cyclone separators 71 in parallel.

A chimney circulation air door 10 is arranged on a connecting pipeline of the secondary separation mechanism 7 and the exhaust chimney 8; and a flue gas circulating air door 11 is arranged on the connecting pipeline of the secondary separation mechanism 7 and the mixing chamber 2.

The wood shavings dryer 5 is a single-channel wood shavings dryer.

A drying method of a wood shavings drying production system, comprising the following steps:

(1) And (3) air door setting: before starting, closing a cold air door of the boiler 1; closing a main air door on an air inlet of the mixing chamber 2, and opening a smoke circulating air door 11, wherein the opening of the smoke circulating air door is more than 50%, and the opening of a chimney circulating air door 10 is less than 5%;

(2) Preheating a system: starting the boiler 1, introducing the flue gas into the mixing chamber 2 by the boiler 1, fully opening a conical cut-off valve 21 of the mixing chamber 2, gradually opening a main air door of the mixing chamber 2, and introducing the flue gas generated by the boiler 1 into a system for preheating; when the feeding port of the wood shaving dryer 5 reaches 100 ℃, continuously increasing the opening of a main air door, and ensuring that the opening of the air door is more than or equal to 50% before feeding;

(3) And (3) drying: when preheating to the feeding temperature of the shavings dryer 5 reaching 145 ℃, starting the semi-dry shavings blanking device 43 and then starting the wet shavings blanking device 42 at a lower feeding speed; according to the wood shavings drying requirement, the temperature of the flue gas is gradually increased to 400 ℃ through the mixing chamber 2 so as to adjust the feeding temperature of the wood shavings dryer 5 to 350 ℃, and simultaneously, the feeding speed of the wet wood shavings blanking device 42 is increased; the discharging temperature of the shavings dryer 5 is adjusted to be 110 ℃ by adjusting the feeding speed and the opening of the chimney circulation air door 10, wet shavings and semi-dry shavings are preheated in the omega heating pipe 41 and then enter the shavings dryer 5 along with flue gas to be dried, after the drying is finished, shavings are conveyed into the blanking box 61 and conveyed into the dry shavings discharger 63 through the first conveyor 62, and the dry shavings discharger 63 separates and collects dry shavings and waste materials respectively;

(4) Flue gas treatment: after the flue gas is discharged from the gas outlet of the mixing chamber 2, the flue gas passes through the first-stage separation mechanism 3 to remove smoke dust and sparks in the flue gas, the smoke dust is discharged, the treated flue gas enters the omega heating pipe 41 and the wood shaving dryer 5 and then is sent into the second-stage separation mechanism 7, the second-stage separation mechanism 7 carries out second-stage separation on the flue gas, and fine wood shavings in the flue gas are separated and discharged and are transported away and collected through the second conveyor 72; after the secondary separation, part of the flue gas is sent into an exhaust chimney 8 to be discharged through an induced draft fan 9, and the other part of the flue gas is sent into the mixing chamber 2 to be recycled.

Example 3

The wood shavings drying production system comprises a boiler 1, a mixing chamber 2, a primary separation mechanism 3, a preheating mechanism 4, a wood shavings dryer 5, a blanking mechanism 6, a secondary separation mechanism 7 and an exhaust chimney 8, wherein the boiler 1 is connected with an air inlet of the mixing chamber 2; the air outlet of the mixing chamber 2 is connected with the pipeline of the primary separation mechanism 3, and a conical cut-off valve 21 is arranged on the air outlet of the mixing chamber 2; the top of the primary separation mechanism 3 is connected with an air inlet pipeline of the preheating mechanism 4 through an air outlet, and a discharge hole is formed in the bottom of the primary separation mechanism 3; the preheating mechanism 4 is provided with a feed inlet and a discharge outlet, the feed inlet is connected with a shaving blanking device, and the discharge outlet is connected with a feed inlet of a shaving dryer 5; the discharging hole of the wood shaving dryer 5 is connected with a blanking mechanism 6; the air outlet of the blanking mechanism 6 is connected with the air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking mechanism 6 is provided with a discharge hole; the top of the secondary separation mechanism 7 is respectively connected with an exhaust chimney 8 and an air inlet pipeline of the mixing chamber 2 through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism 7.

The preheating mechanism 4 is an omega heating pipe 41; the left part of the omega heating pipe 41 is a wet wood chip preheating section, a wet wood chip feeding port is arranged on the wet wood chip preheating section and is connected with a wet wood chip blanking device 42, the right part of the omega heating pipe 41 is a semi-dry wood chip preheating section, and a semi-dry wood chip feeding port is arranged on the semi-dry wood chip preheating section and is connected with a semi-dry wood chip blanking device 43.

The blanking mechanism 6 comprises a blanking box 61, a first conveyor 62 and a dry wood shaving blanking device 63; the left side of the blanking box 61 is provided with a feeding hole, is connected with a discharging hole of the wood shaving dryer 5, the right side of the blanking box is provided with an air outlet, is connected with an air inlet pipeline of the secondary separation mechanism 7, and the bottom of the blanking box is provided with a discharging hole; the first conveyor 62 is arranged below the discharge port of the blanking box 61; the feeder is arranged at the discharge end of the first conveyor 62, and the bottom end of the feeder is provided with a dry material outlet and a waste material outlet.

A conveyor number two 72; the second conveyor 72 is arranged below the discharge hole of the second-stage separation mechanism 7.

An induced draft fan 9 is arranged on the air outlet pipe of the secondary separation mechanism 7.

The primary separation mechanism 3 is formed by connecting a plurality of primary cyclone separators 31 in parallel; the secondary separation mechanism 7 is formed by connecting a plurality of secondary cyclone separators 71 in parallel.

A chimney circulation air door 10 is arranged on a connecting pipeline of the secondary separation mechanism 7 and the exhaust chimney 8; and a flue gas circulating air door 11 is arranged on the connecting pipeline of the secondary separation mechanism 7 and the mixing chamber 2.

The wood shavings dryer 5 is a single-channel wood shavings dryer.

A drying method of a wood shavings drying production system, comprising the following steps:

(1) And (3) air door setting: before starting, closing a cold air door of the boiler 1; closing a main air door on an air inlet of the mixing chamber 2, and opening a smoke circulating air door 11, wherein the opening of the smoke circulating air door is more than 50%, and the opening of a chimney circulating air door 10 is less than 5%;

(2) Preheating a system: starting the boiler 1, introducing the flue gas into the mixing chamber 2 by the boiler 1, fully opening a conical cut-off valve 21 of the mixing chamber 2, gradually opening a main air door of the mixing chamber 2, and introducing the flue gas generated by the boiler 1 into a system for preheating; when the feeding port of the wood shaving dryer 5 reaches 100 ℃, continuously increasing the opening of a main air door, and ensuring that the opening of the air door is more than or equal to 50% before feeding;

(3) And (3) drying: when preheating to the feeding temperature of the shavings dryer 5 reaching 145 ℃, starting the semi-dry shavings blanking device 43 and then starting the wet shavings blanking device 42 at a lower feeding speed; according to the wood shavings drying requirement, the temperature of the flue gas is gradually increased to 420 ℃ through the mixing chamber 2 so as to adjust the feeding temperature of the wood shavings dryer 5 to 250 ℃, and simultaneously the feeding speed of the wet wood shavings feeder 42 is increased; the discharging temperature of the shavings dryer 5 is adjusted to 130 ℃ by adjusting the feeding speed and the opening of the chimney circulation air door 10, wet shavings and semi-dry shavings are preheated in the omega heating pipe 41 and then enter the shavings dryer 5 along with flue gas to be dried, after the drying is finished, shavings are conveyed into the blanking box 61 and conveyed into the dry shavings discharger 63 through the first conveyor 62, and the dry shavings discharger 63 separates and collects dry shavings and waste materials respectively;

(4) Flue gas treatment: after the flue gas is discharged from the gas outlet of the mixing chamber 2, the flue gas passes through the first-stage separation mechanism 3 to remove smoke dust and sparks in the flue gas, the smoke dust is discharged, the treated flue gas enters the omega heating pipe 41 and the wood shaving dryer 5 and then is sent into the second-stage separation mechanism 7, the second-stage separation mechanism 7 carries out second-stage separation on the flue gas, and fine wood shavings in the flue gas are separated and discharged and are transported away and collected through the second conveyor 72; after the secondary separation, part of the flue gas is sent into an exhaust chimney 8 to be discharged through an induced draft fan 9, and the other part of the flue gas is sent into the mixing chamber 2 to be recycled.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The utility model provides a wood shavings drying production system, includes boiler, mixing chamber, one-level separating mechanism, preheats mechanism, wood shavings desiccator, blanking mechanism, second grade separating mechanism, exhaust stack, its characterized in that: the boiler is connected with the air inlet of the mixing chamber; the air outlet of the mixing chamber is connected with the pipeline of the primary separation mechanism, and a conical cut-off valve is arranged on the air outlet of the mixing chamber; the top of the primary separation mechanism is connected with an air inlet pipeline of the preheating mechanism through an air outlet, and the bottom of the primary separation mechanism is provided with a discharge hole; the preheating mechanism is provided with a feed inlet and a discharge outlet, the feed inlet is connected with the wood shaving blanking device, and the discharge outlet is connected with the feed inlet of the wood shaving dryer; the discharging hole of the wood shaving dryer is connected with the blanking mechanism; the air outlet of the blanking mechanism is connected with the air inlet pipeline of the secondary separation mechanism, and the bottom of the blanking mechanism is provided with a discharge hole; the top of the secondary separation mechanism is connected with an exhaust chimney and an air inlet pipeline of the mixing chamber respectively through an air outlet, and a discharge hole is formed in the bottom of the secondary separation mechanism.

2. A wood shavings drying production system as in claim 1, wherein: the preheating mechanism is an omega heating pipe; the left part of the omega heating pipe is a wet wood shaving preheating section, a wet wood shaving feeding port is arranged on the wet wood shaving preheating section and is connected with a wet wood shaving blanking device, the right part of the omega heating pipe is a semi-dry wood shaving preheating section, and a semi-dry wood shaving feeding port is arranged on the semi-dry wood shaving preheating section and is connected with the semi-dry wood shaving blanking device.

3. A wood shavings drying production system as in claim 1, wherein: the blanking mechanism comprises a blanking box, a first conveyor and a dry wood shaving blanking device; the left side of the blanking box is provided with a feeding hole, the blanking box is connected with a discharging hole of the wood shaving dryer, the right side of the blanking box is provided with an air outlet, the blanking box is connected with an air inlet pipeline of the secondary separation mechanism, and the bottom of the blanking box is provided with the discharging hole; the first conveyor is arranged below a discharge hole of the blanking box; the discharging device is arranged at the discharging end of the first conveyor, and the bottom end of the discharging device is provided with a dry material outlet and a waste material outlet.

4. A wood shavings drying production system as in claim 1, wherein: the second conveyor is also included; the second conveyor is arranged below the discharge port of the second separation mechanism.

5. A wood shavings drying production system as in claim 1, wherein: and an induced draft fan is arranged on an air outlet pipe of the secondary separation mechanism.

6. A wood shavings drying production system as in claim 1, wherein: the primary separation mechanism consists of a plurality of primary cyclone separators which are connected in parallel; the secondary separation mechanism is formed by connecting a plurality of secondary cyclone separators in parallel.

7. A wood shavings drying production system as in claim 1, wherein: a chimney circulation air door is arranged on a connecting pipeline of the secondary separation mechanism and the exhaust chimney; and flue gas circulating air doors are arranged on the connecting pipelines of the secondary separation mechanism and the mixing chamber.

8. A wood shavings drying production system as in claim 1, wherein: the wood shavings dryer is a single-channel wood shavings dryer.

9. A method of drying a wood shavings drying production system according to any of claims 1-8, characterized in that: the method comprises the following steps:

(1) And (3) air door setting: before starting, closing a cold air door of the boiler; closing a main air door on an air inlet of the mixing chamber, and opening a smoke circulating air door, wherein the opening of the smoke circulating air door is more than 50%, and the opening of a chimney circulating air door is less than 5%;

(2) Preheating a system: starting a boiler, introducing the flue gas into the mixing chamber by the boiler, fully opening a conical cut-off valve of the mixing chamber, gradually opening a main air door of the mixing chamber, and introducing the flue gas generated by the boiler into a system for preheating; when the feeding port of the wood shaving dryer reaches a certain temperature, continuously increasing the opening of the main air door, and ensuring that the opening of the air door is more than or equal to 50% before feeding;

(3) And (3) drying: when the feeding temperature of the wood shaving dryer reaches a certain temperature, starting the semi-dry wood shaving blanking device, and starting the wet wood shaving blanking device at a lower feeding speed; according to the wood shavings drying requirement, gradually increasing the temperature of the flue gas through the mixing chamber so as to adjust the feeding temperature of the wood shavings dryer and simultaneously increasing the feeding speed of the wet wood shavings feeder; the method comprises the steps of adjusting the feeding speed and the opening of a chimney circulation air door, adjusting the discharging temperature of a wood shaving dryer, preheating wet wood shavings and semi-dry wood shavings in an omega heating pipe, drying the wet wood shavings and the semi-dry wood shavings in the wood shaving dryer together with flue gas, conveying the wood shavings to a blanking box after the drying is finished, conveying the wood shavings to a blanking device through a first conveyor, and separating and respectively collecting the dry wood shavings and waste materials by the blanking device;

(4) Flue gas treatment: the flue gas is discharged from the gas outlet of the mixing chamber, smoke dust and sparks in the flue gas are removed through a first-stage separation mechanism, the smoke dust is discharged, the treated flue gas enters an omega heating pipe and a wood shaving dryer and then is sent into a second-stage separation mechanism, the second-stage separation mechanism carries out second-stage separation on the flue gas, fine wood shavings in the flue gas are separated and discharged, and the flue gas is transported and collected through a second conveyor; after the secondary separation, part of the flue gas is sent into an exhaust chimney through an induced draft fan to be discharged, and the other part of the flue gas is sent into a mixing chamber to be recycled.

10. A drying method of a wood shavings drying production system according to claim 9, characterized in that: in the step (3), the temperature of the flue gas is increased to 400-450 ℃ by a mixer; the feeding temperature of the wood shaving dryer is 250-350 ℃, and the discharging temperature is 110-130 ℃.