CN207247806U - A kind of material drying system - Google Patents

Abstract

A kind of material drying system, including feeding warehouse, roller drying device, Caterpillar-type dryer, hot-blast stove etc.；Roller drying device and Caterpillar-type dryer form two-stage drying system.Feeding warehouse is arranged on roller drying device upper end, and roller drying device includes the roller for the coaxial double-layer tube structure being in tilted layout.Level-one discharge nozzle import is arranged on roller drying device lower end, and outlet is arranged on the upper end of Caterpillar-type dryer.Caterpillar-type dryer includes hothouse and its interior drying track unit, and two level discharge nozzle is provided with below hothouse.Wet stock initially enters low temperature drying during roller drying device carries out from feeding warehouse, subsequently enters Caterpillar-type dryer and carries out high temperature drying.The dried medium of roller drying device comes from the middle low-temperature flue gas of hot-blast stove.The dried medium of Caterpillar-type dryer comes from the hot-air of hot-blast stove generation, and continues after exchanging heat into roller drying device as middle low temperature drying medium.The utility model has the advantages that drying effect is good, final product quality is high.

Description

A material drying system

technical field

The utility model relates to a material drying system, in particular to a system for drying sheet or block materials, which belongs to the field of drying equipment.

Background technique

Biomass such as cassava has a high moisture content, and its storage, transportation and subsequent utilization need to greatly reduce its moisture content. However, if it is directly crushed and processed, it is easy to form pulp or harden because of its high moisture content, and at the same time, the investment and energy consumption of wet pulp drying are large. However, due to the low and uneven internal transmission rate of flake or block materials, the drying process often results in high cost, low production capacity, uneven drying, and poor product quality.

Utility model content

The purpose of the utility model is to provide a material drying system, which adopts a two-stage drying device, and is especially suitable for massive or flake materials such as cassava and potato cubes with high moisture content.

The utility model is achieved through the following technical solutions:

A material drying system, the system includes a feed bin, a drum drying device, a crawler dryer, a hot blast stove, a waste gas pipe and a chimney;

The feed bin is arranged at the upper end of the drum drying device, and the drum drying device includes drums arranged obliquely, and the drums adopt a coaxial double-layer cylinder structure; the exhaust gas pipe is arranged at the drum drying device. The upper end is located below the feed bin;

The lower end of the drum drying device is provided with a primary discharge pipe; the primary discharge pipe is connected to the crawler dryer, and its outlet is set at the upper end of the crawler dryer;

The crawler dryer includes a drying chamber and a drying crawler unit arranged in the drying chamber; the outlet of the primary discharge pipe is arranged at one end of the drying crawler unit, and a secondary discharge pipe;

The drying crawler unit includes an annular drying crawler and several air distribution pipes arranged between the annular drying crawlers; the several air distribution pipes are connected by a hot air header arranged outside the drying chamber;

The hot blast stove includes a hot blast stove feeder, a reaction furnace, a tail flue and a heat exchanger located at the tail flue; the hot blast stove feeder is arranged at the front end of the reaction furnace; the tail flue is arranged At the rear end of the reaction furnace; the heat exchanger is connected with a cold air pipe and a hot air pipe, and the hot air pipe is connected with the hot air header; the tail flue is dried with the drum through the hot flue gas pipe device connection;

The hot flue gas pipe is connected to the lower end of the drum drying device and is located above the primary discharge pipe.

In the above technical solution, the crawler dryer also includes an air collecting hood arranged on the top of the drying chamber and a dust collection bin arranged at the bottom of the drying chamber; The drying device is connected and the hot gas pipe is arranged at the lower end of the drum drying device and above the primary discharge pipe.

In the above technical solution, multiple gas collecting hoods are provided, and the multiple gas collecting hoods are connected in parallel with the hot gas pipes. Multiple dust collection bins are arranged side by side.

In the above technical solution, the system also includes an induced draft fan connecting the waste gas pipe and the chimney, or/and includes a blower arranged at the front end of the reaction furnace and an air fan connected to the cold air pipe.

In the above technical solution, the drying crawler units are arranged in multiple stages from top to bottom in the drying chamber, and the multi-stage drying crawler units are arranged in a dislocation; the drying crawlers of the adjacent upper and lower stages of drying crawler units move in opposite directions; The direction is the front and rear ends, and the secondary discharge pipe is arranged below the end of the last-stage drying crawler unit; the air distribution pipe of each stage of drying crawler unit corresponds to the first-stage hot air header; the multi-stage hot air header is connected to the The hot air pipes are connected in parallel.

A method for operating a material drying system as described in the above technical solution, comprising:

Lump or flake wet material enters the drum drying device from the feed bin, slowly moves to the end of the drum in the inclined drum, and rotates with the rotation of the drum;

The fuel enters the reaction furnace from the feeder of the hot blast stove for gasification and combustion reaction, and the high-temperature flue gas generated enters the tail flue, and exchanges heat with the heat exchanger in the tail flue to become medium-low temperature hot flue gas;

Taking the moving direction of the wet material as the front and back, the hot flue gas enters the end of the drum drying device from the hot flue gas pipe, and is in countercurrent contact with the wet material for drying. The exhaust pipe at the front end of the drying device is discharged, and is extracted by the induced draft fan and sent to the chimney for discharge;

The wet material is dried by hot flue gas in the drum drying device to become semi-dry material, and enters the drying chamber of the crawler dryer through the primary discharge pipe below the end of the drum drying device;

Cold air enters the heat exchanger from the cold air pipe and exchanges heat with the high-temperature flue gas in the tail flue to become hot air, which is discharged from the hot air pipe as a drying medium for semi-dry materials and distributed to several a distribution duct;

The semi-dry material falls on the upper surface of the drying track under the first-stage discharge pipe and moves with the drying track. During the moving process, it is dried into dry material by the hot air entering from the air distribution pipe. The stage discharge pipe discharges out of the drying chamber as a finished product.

When the top of the drying chamber is provided with an air collecting hood and the bottom of the drying chamber is provided with a dust collection chamber, the above operation method also includes:

The hot air enters the drying room through the air distribution pipe, exchanges heat with the semi-dry material in the drying room to become medium and low temperature air, and then collects it through the air collecting hood on the top of the drying room, and enters the drum drying device from the hot air pipe, and at the lower end of the drum drying device and The hot flue gas entering from the hot flue gas pipe is mixed together as the drying medium;

The tiny particles dropped by the semi-dry material during the drying process of the drying track are collected by the dust collection bin.

When the dry crawler unit is multi-stage, the above operation method also includes:

The semi-dry material falls on the upper surface of the drying track of the first-stage drying crawler unit under the first-stage discharge pipe and moves with the drying track. During the movement, it is dried by the hot air entering from the air distribution pipe; the semi-dry material moves to the When the other end of the first-level drying track unit is turned, the upper surface of the drying track is turned downward, and the semi-dry material falls from the drying track of this level to the upper surface of the drying track unit of the next-level drying track unit arranged in a misplaced position, and is dried along with the next level. The track moves in reverse and continues to be dried by hot air;

The secondary discharge pipe is set under the end of the final drying crawler unit, and the material is dried when the final drying crawler unit moves to the end with the drying crawler, and the dried material is discharged from the drying chamber through the secondary discharge pipe as a finished product.

Compared with the prior art, the utility model has the following advantages and outstanding effects: the two-stage drying system of the drum drying device and the crawler dryer makes the drying effect good, the energy efficiency is high, and the system cost is reduced at the same time.

Description of drawings

Fig. 1 is a schematic diagram of a material drying system involved in the present invention.

In the figure: 1-feed bin; 2-drum drying device; 3-first-stage discharge pipe; 4-crawler dryer; 41-drying track; 42-hot air header; 43-distribution pipe; 44-two Stage discharge pipe; 45-dust collection bin; 46-gas collecting hood; 47-hot air pipe; 48-drying room; 49-drying crawler unit; 5-hot blast stove; 51-hot blast stove feeder; 52-reaction furnace ;53-tail flue; 54-heat exchanger; 55-hot flue gas pipe; 56-cold air pipe; 57-hot air pipe; 58-air fan; 8 - Chimney.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the utility model and working process are further described.

The orientation terms such as up, down, left, right, front and rear in this application document are established based on the positional relationship shown in the drawings. If the drawings are different, the corresponding positional relationship may also change accordingly, so this should not be understood as limiting the scope of protection.

As shown in Figure 1, a material drying system, the system includes a feed bin 1, a drum drying device 2, a crawler dryer 4, a hot blast stove 5, a waste gas pipe 6, a chimney 8, and the like.

The feeding bin 1 is arranged at the upper end of the drum drying device 2 , that is, above the front end. The drum drying device 2 includes drums arranged obliquely. The drums adopt a coaxial double-layer cylinder structure. The materials of the inner and outer cylinders can be different, and the outer cylinder can also adopt a skeleton structure to reduce the cost. The drum adopts a counter-current drying method, so the waste gas pipe 6 is arranged under the front end of the drum drying device 2, that is, below the feeding bin.

A primary discharge pipe 3 is arranged at the lower end of the drum drying device 2 , that is, below the end. The primary discharge pipe 3 connects the drum drying device 2 and the crawler dryer 4 , its inlet is at the lower end of the drum drying device 2 and its outlet is arranged at the upper end of the crawler dryer 4 .

The crawler dryer 4 includes a drying chamber 48 and a drying crawler unit 49 provided in the drying chamber 48 . The first-level discharge pipe 3 outlet is arranged on one end of the dry crawler unit 49, and when the dry crawler unit 49 is only provided with one level, the other end of the dry crawler unit 49 is provided with a secondary discharge pipe 44, and the secondary discharge pipe 44 Set outside the drying chamber 48.

Dry crawler unit 49 comprises the dry crawler belt 41 of annular arrangement and is arranged on several air distribution pipes 43 between annular dry crawler belts 41; Distribute heat transfer medium. The dry crawler belt 41 moves in a circle, and its upper surface is arranged horizontally.

The hot blast stove 5 comprises a hot blast stove feeder 51 , a reaction furnace 52 , a tail flue 53 and a heat exchanger 54 arranged at the tail flue 53 . The hot stove feeder 51 is arranged at the front end of the reaction furnace 52 ; the tail flue 53 is arranged at the rear end of the reaction furnace 52 . The heat exchanger 54 is connected with a cold air pipe 56 and a hot air pipe 57 , and the hot air pipe 57 is connected with the hot air header 42 of the crawler dryer 4 at the same time. And the tail flue 53 is connected with the drum drying device 2 through the hot flue gas pipe 55 . Both the hot gas pipe 47 and the hot flue gas pipe 55 are arranged at the lower end of the drum drying device 2 and above the primary discharge pipe 3 .

As a further improvement, the crawler dryer 4 further includes an air collecting hood 46 arranged at the top of the drying chamber 48 and a dust collection bin 45 arranged at the bottom of the drying chamber 48 . The gas collecting hood 46 is provided with a hot gas pipe 47 connected with the drum drying device 2 . According to the size of the drying chamber, multiple gas collecting hoods 46 can be provided, and the multiple gas collecting hoods 46 are connected in parallel with the hot gas pipes 47 . A plurality of dust collection bins 45 can also be arranged side by side.

In order to improve the drying effect as much as possible, the drying crawler units 49 are arranged in multiple stages from top to bottom in the drying chamber 48, and the adjacent drying crawler units 49 are arranged in a staggered position, that is, the starting end of the next stage of drying crawler units is at the upper stage Dry the outer side of the running direction of the upper surface of the crawler unit to catch the material falling from the upper dry crawler unit. The drying crawler belts 41 of the adjacent upper and lower stages of drying crawler belt units 49 move in opposite directions. Taking the moving direction of materials on any one-stage drying crawler unit as the front and rear ends, the secondary discharge pipe 44 is arranged below the end of the last-stage drying crawler unit and outside the drying chamber 48 . The air distribution pipe 43 of each stage of drying crawler unit 49 corresponds to the primary hot air header 42; the multistage hot air header 42 is connected in parallel with the hot air pipe 57.

The technical solution has three implementation modes.

In the first embodiment, the system described in the present invention further includes an induced draft fan 7 connecting the waste gas pipe 6 and the chimney 8 . The induced draft fan 7 not only extracts the drying medium in the drum drying device 2, but also forms a negative pressure in the whole system, so that the drying system of the present invention operates under negative pressure.

In the second embodiment, the system of the present invention further includes a blower 59 arranged at the front end of the reaction furnace 52 and an air blower 58 connected to the cold air pipe. The blower 59 provides gasification and combustion aids for the reaction furnace 52, and forms a positive pressure in the whole system, so that the drying system of the utility model operates under positive pressure.

In the third embodiment, the system of the utility model also includes an induced draft fan 7 connecting the waste gas pipe 6 and the chimney 8, a blower 59 arranged at the front end of the reaction furnace 52, and an air blower 58 connected with the cold air pipe. By adjusting parameters such as the induced draft fan 7, blower 59, and air blower 58 pressure and flow, the system can reach a balanced state and operate at zero or slight pressure.

A method for operating a material drying system, using the above system, and the method includes:

Lumpy or flake wet material enters the drum drying device 2 from the feed bin 1, slowly moves to the lower end of the drum in the inclined drum, and rotates as the drum rotates;

The fuel enters the reaction furnace 52 from the feeder 51 of the hot blast stove for gasification and combustion reaction, and the high-temperature flue gas generated enters the tail flue 53, and exchanges heat with the heat exchanger 54 in the tail flue 53 to become medium-low temperature hot smoke gas;

Taking the moving direction of the wet material as the front and back, the hot flue gas enters the end of the drum drying device 2 from the hot flue gas pipe 55, and contacts with the wet material countercurrently for drying. Discharge from the waste gas pipe 6 at the front end of the drum drying device 2, and deliver to the chimney 8 for discharge;

The wet material is dried by hot flue gas in the drum drying device 2 into semi-dry material, and enters the drying chamber 48 of the crawler dryer 4 through the primary discharge pipe 3 below the end of the drum drying device 2;

The cold air enters the heat exchanger 54 from the cold air pipe 56 and exchanges heat with the high-temperature flue gas in the tail flue 53 to become hot air, which is discharged from the hot air pipe 57 and used as a drying medium for semi-dry materials. The hot air header 42 is distributed to several air distribution pipes 43;

The semi-dry material enters the drying chamber 48 through the primary discharge pipe 3 from the drum drying device, falls to the upper surface of the drying crawler 41 below the outlet of the primary discharge pipe 3, and moves horizontally with the drying crawler 41. The hot air that enters from the air distribution pipe 43 is dried into dry materials, and the dry materials are discharged from the drying chamber 48 from the secondary discharge pipe 44 below the other end of the drying track 41 as finished products.

When the top of the drying chamber is provided with an air collecting hood and the bottom of the drying chamber is provided with a dust collection chamber, the above operation method also includes:

The hot air enters the drying chamber 48 through the air distribution pipe 43, exchanges heat with the semi-dry material in the drying chamber 48 to become medium-low temperature air, and then collects it through the air collecting hood 46 on the top of the drying chamber 48, and enters the drum drying device from the hot air pipe 47 2. At the lower end of the drum drying device 2, mix with the hot flue gas entering from the hot flue gas pipe 55, and use it as a drying medium together;

The tiny particles dropped by the semi-dry material during the drying process of the drying track 41 are collected by the dust collection bin 45 .

When the dry crawler unit is multi-stage, the above operation method also includes:

The semi-dry material falls on the upper surface of the drying track 41 of the first-level drying crawler unit 49 below the primary discharge pipe 3 and moves with the drying track 41, and is dried by the hot air entering from the air distribution pipe 43 during the movement; the semi-dry material When the dry crawler moves to the other end of the first-stage dry crawler unit 49, the upper surface of the dry crawler turns downward, and the semi-dry material falls from the dry crawler of this stage to the upper surface of the dry crawler of the next-stage dry crawler unit arranged in a misplaced position. And move in the opposite direction with the next level of drying track, and continue to be dried by hot air;

The secondary discharge pipe 44 is arranged below the end of the final drying crawler unit, and the material is dried when the final drying crawler unit moves to the end with the drying crawler 41, and the dried material is discharged from the drying chamber 48 from the secondary discharge pipe 44 as a finished product .

When the system is only equipped with induced draft fan 7, the system operates under negative pressure. When the system was only equipped with blower 59 and air blower 58, the system was operated under positive pressure. And when the system is equipped with induced draft fan 7, air blower 59 and air blower 58 simultaneously, the system can reach equilibrium operation.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. A kind of 1. material drying system, it is characterised in that：

   The system comprises feeding warehouse（1）, roller drying device（2）, Caterpillar-type dryer（4）, hot-blast stove（5）, flue gas leading（6） And chimney（8）；

   The feeding warehouse（1）It is arranged on the roller drying device（2）Upper end, the roller drying device（2）Including tilting The roller of arrangement, the roller use coaxial double-layer tube structure；The flue gas leading（6）It is arranged on the roller drying device （2）Upper end and be located at feeding warehouse（1）Lower section；

   The roller drying device（2）Lower end be provided with level-one discharge nozzle（3）；The level-one discharge nozzle（3）With the crawler belt Formula drier（4）Connection, and its outlet is arranged on the Caterpillar-type dryer（4）Top one end；

   The Caterpillar-type dryer（4）Including hothouse（48）And it is arranged on hothouse（48）Interior drying track unit （49）；The level-one discharge nozzle（3）Outlet is arranged on the dry track unit（49）One end, the dry track unit （49）The other end below be provided with two level discharge nozzle（44）；

   The dry track unit（49）Including the drying crawler belt being circular layout（41）And it is arranged on the ring drying crawler belt （41）Between several aid distributing pipes（43）；Several described aid distributing pipes（43）By being arranged on hothouse（48）Outer hot wind header （42）Connection；

   The hot-blast stove（5）Including hot-blast stove feeder（51）, reacting furnace（52）, back-end ductwork（53）Be located at back-end ductwork （53）Heat exchanger（54）；The hot-blast stove feeder（51）It is arranged on the reacting furnace（52）Front end；The back-end ductwork （53）It is arranged on the reacting furnace（52）Rear end；The heat exchanger（54）It is connected with cool air hose（56）And hot blast pipe（57）, it is described Hot blast pipe（57）With the hot wind header（42）Connection；The back-end ductwork（53）Pass through thermal chimney（55）Done with the roller Dry device（2）Connection；

   The thermal chimney（55）It is connected to the roller drying device（2）Lower end and be located at the level-one discharge nozzle（3）On Side.
2. A kind of 2. material drying system described in accordance with the claim 1, it is characterised in that：The Caterpillar-type dryer（4）Also wrap Include and be arranged on the hothouse（48）The gas gathering mask at top（46）Be arranged on the hothouse（48）The dust-collecting bin of bottom（45）； The gas gathering mask（46）Equipped with heating pipe（47）With the roller drying device（2）Connection and the heating pipe（47）Positioned at described Level-one discharge nozzle（3）Top.
3. A kind of 3. material drying system described in accordance with the claim 1, it is characterised in that：The system also includes connection flue gas leading （6）With chimney（8）Air-introduced machine（7）.
4. A kind of 4. material drying system described in accordance with the claim 1, it is characterised in that：The system also includes be arranged on reaction Stove（52）The air blower of front end（59）With with the cool air hose（56）The air blower of connection（58）.
5. A kind of 5. material drying system described in accordance with the claim 2, it is characterised in that：The gas gathering mask（46）Set it is multiple, Multiple gas gathering masks（46）With the heating pipe（47）It is connected in parallel.
6. A kind of 6. material drying system described in accordance with the claim 2, it is characterised in that：The dust-collecting bin（45）It is set up in parallel more It is a.
7. A kind of 7. material drying system described in accordance with the claim 1, it is characterised in that：The dry track unit（49）Dry Dry room（48）Multistage, the adjacent drying track unit of two-stage up and down is inside set from top to bottom（49）Between for dislocation arrangement；On adjacent Lower two-stage dries track unit（49）Drying crawler belt（41）Moving direction is opposite；It is described using material moving direction as front and back end Two level discharge nozzle（44）It is arranged on final stage drying track unit（49）End below；The drying track unit per level-one（49）Match somebody with somebody Air hose（43）Corresponding level-one hot wind header（42）；The multistage hot wind header（42）With the hot blast pipe（57）It is connected in parallel.