CN223090997U - Wet material three-section method drying system - Google Patents

Abstract

The present invention discloses a three-stage drying system for wet materials, which belongs to the technical field of sand processing, and includes a front auxiliary drying device, a screw conveyor, a dryer, and a silo that are sequentially connected according to the material processing process; the front auxiliary drying device includes a box body, and the box body includes from top to bottom: a spiral circulation conveyor, an exhaust gas discharge pipe, a hot air pipe, a screen, and a screw conveyor; an exhaust hole is provided at the bottom of the exhaust gas discharge pipe; a drop barrel inserted into the wet material is distributed at the bottom of the spiral circulation conveyor; the dryer includes an inner cylinder and an outer cylinder, the inner cylinder is connected to a second hot air furnace, and conveying blades are distributed on the inner wall of the outer cylinder; a baffle is provided in the silo, and an air intake pipe for discharging waste heat exhaust gas is provided below the baffle. The present invention fully utilizes waste heat to perform three-stage drying of wet sand materials, and can also purify the exhaust gas of the hot air furnace, which can not only improve the utilization rate of thermal energy, but also greatly reduce the cost of exhaust gas purification, and can achieve energy saving of more than 50%.

Description

Wet material three-section method drying system

Technical Field

The invention belongs to the technical field of drying equipment, and particularly relates to a wet material three-stage drying system.

Background

In the sand production process, wet materials are required to be dried, the wet materials are placed in a hopper in the prior art, a screw conveyer at the bottom of the hopper conveys the wet materials to a roller dryer, one end of a roller of the dryer is connected with a hot blast stove, hot air of the hot blast stove directly enters the dryer to be dried in contact with rolling sand, then the dried sand is discharged from a discharge hole of the dryer, hot air tail gas and moisture are required to be treated through a whole set of air purification system, the whole set of air purification system comprises an adsorption tower, a resolution tower, an atomizer, a dust remover, a flocculation precipitation device and the like, the dust remover generally adopts a cloth bag dust remover, 300-500 dust collectors are generally required to be used for the whole set of system, and the cost is at least 20-30 ten thousand, so that the sand processing cost is increased, the existing sand processing wet material drying system has insufficient heat utilization rate for the hot blast stove, and the sand drying efficiency is reduced.

Disclosure of Invention

Aiming at the problems, the invention provides a wet material three-stage method drying system which can fully utilize waste heat to dry granular wet materials in three stages, and can also purify tail gas of a hot blast stove, so that the heat energy utilization rate can be improved, the tail gas purification cost can be greatly reduced, and energy saving of more than 50% can be realized.

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

A wet material three-section method drying system comprises a preposed auxiliary drying device, a screw conveyer, a dryer and a storage bin which are sequentially connected according to a material processing procedure;

The front auxiliary drying device comprises a box body, wherein a spiral circulating conveyor, a tail gas discharge pipe, a hot air pipe, a screen mesh and the spiral conveyor are sequentially arranged in the box body from top to bottom;

The dryer comprises a rotatable outer barrel, an inner barrel is arranged in the outer barrel, the input end of the inner barrel is communicated with a second hot blast stove, conveying blades are distributed on the inner wall of the outer barrel, one end of the outer barrel is communicated with a feed inlet, and the other end of the outer barrel is communicated with a discharge outlet;

A baffle is arranged in the storage bin, and an air inlet pipe for discharging waste heat and tail gas is arranged below the baffle;

The output end of the outer cylinder is communicated with a second dust remover through a pipeline, and the output end of the second dust remover is communicated with a tail gas discharge pipe through a pipeline;

the outlet of the inner cylinder is communicated with the first dust remover through a pipeline, and the output end of the first dust remover is respectively connected with the input end of the outer cylinder and the air inlet pipe through a branch pipeline.

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

According to the invention, the three-section type drying process is adopted to carry out drying treatment on the granular wet materials, the first section is the front auxiliary drying device, auxiliary drying is carried out before the wet materials enter the dryer, a part of moisture can be removed in advance, the second section is the dryer for drying to remove most of moisture, the third section is the storage bin for removing the last moisture, the drying efficiency is high, meanwhile, the waste heat utilization efficiency of the hot blast stove is high, the tail gas is not required to be purified by adopting a conventional whole set of high-cost air purification system, the tail gas can be purified through the wet materials, meanwhile, the wet materials are dried, and the processing cost of the wet materials is greatly reduced.

The first hot air discharged by the first hot air furnace enters the hot air pipe to heat the hot air pipe, then enters the outer barrel through the pipeline to dry sand in the outer barrel, and the sand and tail gas are mixed to realize primary purification;

The second hot air discharged by the second hot air furnace enters an inner cylinder of the dryer to heat the inner cylinder, then enters a first dust remover through a pipeline to be split into two parts, one part enters a storage bin through the pipeline to dry sand in the storage bin at last, is mixed with the sand to realize the absorption and purification of tail gas once, and finally is discharged from a top dust remover at the top end of the storage bin, and the other part returns to an outer cylinder of the dryer through the pipeline to be mixed with a first part of hot air in the outer cylinder to heat the sand in the outer cylinder and finally enters a tail gas discharge pipe together with the first part of hot air.

The improved technical effect is that the sand is dried by fully utilizing the hot air of the hot blast stove, the heat energy utilization efficiency is improved, meanwhile, the tail gas is purified by the sand, the mutual utilization is realized, the sand drying efficiency is improved, and the production cost is reduced.

As a further improvement of the scheme, the spiral circulating conveyor comprises two conveying grooves which are arranged side by side, spiral conveying shafts are arranged in the conveying grooves, communication ports which are communicated with each other are formed in two ends of the two conveying grooves, conveying directions of the two spiral conveying shafts are different, and a feed hopper is arranged above one of the conveying grooves.

The improved technical effect is that sand can circulate above the box through the spiral circulating conveyor and automatically supplement the sand into the blanking cylinder at any time, so that the sand in the box can be dried more quickly and uniformly, the stability of the sand surface is ensured, and the tail gas purifying effect is kept stable.

As a further improvement of the scheme, the input end branch of the tail gas discharge pipe is connected with a shunt pipe, an adjusting valve is arranged on the shunt pipe, and the blanking cylinders are mutually communicated through the shunt pipe.

The improved technical effect is that waste heat tail gas can directly enter the blanking cylinder through the shunt pipe and then ascend to enter the spiral circulation conveyor to dry sand flowing circularly in the spiral circulation conveyor, and the flow of the waste heat tail gas entering the shunt pipe can be adjusted through the adjusting valve.

As a further improvement of the scheme, blanking barrels are distributed at the bottom of a conveying groove of the spiral circulation conveyor, the blanking barrels comprise a first blanking barrel and a second blanking barrel, the length of the first blanking barrel is larger than that of the second blanking barrel, the first blanking barrel is located between adjacent tail gas discharge pipes, and the second blanking barrel is located right above the tail gas discharge pipes.

The improved technical effects are that the first blanking cylinder is inserted into sand and is positioned between adjacent tail gas discharge pipes, sand right above the tail gas discharge pipes is blocked by the tail gas discharge pipes, the descending speed is low, sand between the adjacent tail gas discharge pipes is high in drying speed and high in downward flow frequency, local cavity forming frequency is high, so that wet materials can fall into the local cavity from the first blanking cylinder to fill the local cavity, the characteristic of high drying speed and high flow speed of the part is fully utilized, drying efficiency of the wet materials is improved, the second blanking cylinder is positioned above the minimum required sand surface and is positioned right above the tail gas discharge pipes, when the sand surface descends, the wet materials in the second blanking cylinder fill the position, and therefore the whole height of the sand surface can be ensured to be stable, and the stable efficiency of tail gas purification can be realized only when the sand surface is stable.

As a further improvement of the scheme, the inner cylinder is internally provided with the helical blades, and the outer wall of the inner cylinder is provided with the cooling fins which are axially arranged.

The improved technical effect is that the spiral blades can improve the residence time of hot air in the inner cylinder, and simultaneously, the spiral blades can improve the heat energy absorption effect and transfer the heat energy to the outer wall of the inner cylinder, so that the heat utilization efficiency is improved.

As a further improvement of the scheme, the output end of the screw conveyer is connected with a first elevator, the output end of the first elevator is provided with a transition hopper, a conveyer belt is arranged below the transition hopper, the output end of the conveyer belt is connected with the feed inlet, the discharge port is connected with a second elevator, and the second elevator is connected with the feed port of the storage bin.

The improved technical effect is that the stable conveying of sand in the whole system is realized by adopting a lifting machine, a conveying belt and the like.

As a further improvement of the scheme, the baffle is an upward-protruding arc plate.

The improved technical effect is that the adoption of the arc plate protruding upwards can play a role in shielding the outlet of the air inlet pipe, sand in the storage bin is prevented from entering the air inlet pipe, and meanwhile, the arc plate can promote hot air exhausted by the air inlet pipe to flow downwards, so that the drying effect of the storage bin is improved.

As a further improvement of the scheme, a bin top dust remover is arranged at the upper end of the bin.

The improved technical effect is that the hot air entering the feed bin from the air inlet pipe is discharged conveniently, and the tail gas is purified once.

As a further improvement of the scheme, the annular heat dissipation plate is arranged on the hot air pipe.

The improved technical effect is that the heat energy utilization rate of the hot air pipe is improved.

As a further improvement of the above solution, the screen is provided with a vibrator at the side.

The improved technical effect is that the flow of sand can be promoted and the sand is prevented from being blocked by controlling the vibration of the screen through the vibrator.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the system.

Fig. 2 is a schematic structural view of a front auxiliary drying device.

Fig. 3 is a schematic view of a second structure of the front auxiliary drying device.

Fig. 4 is a schematic view of a third structure of the front auxiliary drying device.

Fig. 5 is a bottom view of the exhaust gas discharge pipe.

Fig. 6 is a schematic structural view of a hot blast pipe.

Fig. 7 is a graph showing the positional distribution relationship between the exhaust gas discharge pipe and the hot air pipe.

Fig. 8 is a schematic view of a spiral circulation conveyor.

Fig. 9 is a schematic view of a dryer structure.

FIG. 10 shows a dryer end face schematic cross-sectional structure.

Fig. 11 is a schematic view of a silo structure.

The air conditioner comprises a first hot blast stove, a 2, a screw conveyor, a 3, a front auxiliary drying device, a 4, a first lifting machine, a 5, a transition hopper, a 7, a second hot blast stove, a 8, a dryer, a 9, a first dust remover, a 10, a second lifting machine, a 11, a cabin top dust remover, a 12, a feed cabin, a 13, a wind shutter, a 14, a second dust remover, a 15, an air inlet, a 16, a baffle plate, a 17, a feed port, a 18, a discharge conveyer belt, a 31, a screw circulation conveyor, a 32, a feed hopper, a 33, a box body, a 34, a first blanking cylinder, a 35, a second blanking cylinder, a 36, an exhaust gas discharge pipe, a 37, a hot blast pipe, a 38, a screen, a 39, a vibrator, a 40, a shunt pipe, a 41, a regulating valve, a 81, an outer cylinder, a 82, a conveying blade, a 83, a radiating fin, a 84, an inner cylinder, a 85, a screw blade, a 86, a discharge port, a 87, a feed inlet, a 88, a driving wheel, a 89, a driving motor, a 90, a supporting seat, a 91, a first fixed cylinder, a 92, a second fixed cylinder, a 93, a pipeline, a 311, a conveying groove, a 311, a vent, a heat dissipation plate, a 313, a heat dissipation plate, a conveying shaft, a 313.

Detailed Description

The following detailed description of the invention, in conjunction with the examples, is intended to be merely exemplary and explanatory and should not be construed as limiting the scope of the invention in any way, as described in detail below, in order to provide a better understanding of the invention as embodied in the present invention.

Example 1:

As shown in fig. 1-9, the embodiment adopts a specific scheme that the wet material three-stage method drying system comprises a preposed auxiliary drying device 3, a screw conveyer 2, a dryer 8 and a storage bin 12 which are sequentially connected according to a material processing procedure;

Specifically, the bottom of the pre-auxiliary drying device 3 is connected with a screw conveyer 2, the output end of the screw conveyer 2 is connected with the input end of a first lifter 4, the input end of the first lifter 4 is also provided with a relevant wind device 13, a transition hopper 5 is arranged below the output end of the first lifter 4 and used for collecting sand output from the first lifter 4, a conveyor belt is arranged at the outlet below the transition hopper 5 and used for conveying sand into a dryer 8, the sand is dried in the dryer 8 and then discharged into a second lifter 10 from a discharge hole 86, the second lifter 10 lifts the sand to be fed into a storage bin 12, the sand falls into a discharge conveyor belt 18 to be conveyed out after being collected and dried in the storage bin 12, and the relevant wind device 13 is arranged above the discharge conveyor belt 18.

In the invention, the prepositive auxiliary drying device has three structures:

as shown in fig. 2 and 5-8, the first structure of the front auxiliary drying device comprises a box body 33 for containing wet materials, wherein a spiral circulating conveyor 31, a tail gas discharge pipe 36, a hot blast pipe 37 and a screen 38 are sequentially arranged in the box body 33 from top to bottom, a spiral conveyor 2 is arranged at the outlet of the bottom end of the box body 33, an exhaust hole 361 is arranged at the bottom of the tail gas discharge pipe 36, blanking cylinders inserted into the wet materials are distributed at the bottom of the spiral circulating conveyor 31, one end of the hot blast pipe 37 is communicated with the first hot blast stove 1, and the inlet of the tail gas discharge pipe 36 is communicated with a pipeline of hot blast tail gas.

Specifically, the upper end of the box body 33 is opened, the lower end of the box body 33 is in a hopper shape, a spiral conveyer 2 is arranged at the bottom outlet, sand wet materials are contained in the box body 33, the wet materials firstly enter the spiral conveyer 31 from the feed hopper 32, the spiral conveyer 31 uniformly conveys the sand into the box body 33, a layer of hot air pipes 37 is distributed in the box body 33, the hot air pipes 37 are formed by combining a plurality of pipelines side by side, one end of each hot air pipe is connected with the first hot air furnace 1, the other end of each hot air pipe extends out of the side wall of the box body 33, a heat dissipation plate 371 can be additionally arranged on the hot air pipes 37, a layer of tail gas discharge pipes 36 are distributed above the hot air pipes 37, the tail gas discharge pipes 36 are formed by combining a plurality of pipelines side by side, one end of each tail gas discharge pipe penetrates through the side wall of the box body 33, exhaust holes 361 are uniformly distributed at the bottom of the tail gas discharge pipes 36 and are used for discharging high-temperature tail gas into the wet materials to dry the sand, meanwhile, the sand is purified, and the tail gas discharge pipes 36 and the hot air pipes 37 are arranged in a crisscross mode.

The spiral circulating conveyor 31 is arranged above the tail gas discharge pipe 36, the structure of the spiral circulating conveyor 31 is basically the same as that of the double-spiral conveyor 2, the spiral circulating conveyor 31 comprises two conveying grooves 311 which are arranged side by side, spiral conveying shafts 312 are arranged in the conveying grooves 311, two ends of the two conveying grooves 311 are provided with mutually communicated communication ports 313, conveying directions of the two spiral conveying shafts 312 are different, a feed hopper 32 is arranged above one of the conveying grooves 311, the end of one spiral conveying shaft 312 is connected with a motor, and the other ends of the spiral conveying shafts 312 are mutually driven through gears 314.

The wet material enters one of the conveying grooves 311 from the feed hopper 32, and along with the conveying of the spiral conveying shaft 312 to the tail end and then enters the other conveying groove 311 from the communication port 313 of the tail end, the conveying direction of the spiral conveying shaft 312 in the conveying groove 311 is opposite, the wet material is conveyed to the other end and then passes through the communication port 313 of the end to enter the previous conveying groove 311, so that the wet material flows in the spiral circulating conveyor 31 in a circulating manner, and when sand in one blanking barrel at the bottom of the conveying groove 311 falls, the wet material in the spiral circulating conveyor 31 is filled into the blanking barrel immediately;

The number of the spiral circulation conveyors 31 is determined according to the area of the upper port of the box body 33, generally 2-3 spiral circulation conveyors are adopted to achieve the uniform discharging effect on the wet materials, blanking barrels are distributed at the bottom of the conveying groove 311 of the spiral circulation conveyors 31, and the blanking barrels are inserted into the wet materials.

In the invention, the combination of the spiral circulation conveyor 31, the blanking barrel, the tail gas discharge pipe 36 and the hot air pipe 37 has the following technical effects:

The hot blast pipe 37 directly guides the hot blast of the first hot blast stove 1 into the box body 33 to dry the wet materials, the hot blast enters the dryer at the rear end from the hot blast pipe 37 to be utilized for the second time, then returns to the tail gas discharge pipe 36 to be utilized for the third time, meanwhile, the tail gas discharge pipe 36 can directly dry sand by utilizing the waste heat of the tail gas and can absorb and purify the tail gas by utilizing the wet materials of the sand, the moisture in the sand has a good absorption effect on the particulate matters in the tail gas, gaps among the sand form a honeycomb structure to have blocking and filtering effects on the tail gas, the wet materials absorb the particulate matters in enough tail gas, then fall to the bottom of the box body 33 along with the flowing of the sand, the new wet materials fall to absorb the tail gas again, and the tail gas is continuously utilized, so that the tail gas purifying treatment has a good effect.

The sand right above the tail gas discharge pipes 36 is blocked by the tail gas discharge pipes 36, the falling speed is low, the sand between the adjacent tail gas discharge pipes 36 is high in drying speed, the downward flow frequency is high, and the frequency of forming a local cavity is high, so that wet materials can fall into the local cavity from the first blanking barrel 34 to fill up, the characteristic of high drying speed and high flow speed of the part is fully utilized, the drying efficiency of the wet materials is improved, and meanwhile, the flowing wet materials are utilized to carry out purification treatment on the tail gas.

When tail gas enters into sand wet materials through the tail gas discharge pipe 36 to be absorbed and purified, the tail gas can rise to enter into the spiral circulation conveyor 31 from the blanking barrel, and sand flowing in the spiral circulation conveyor 31 in a circulating way is dried, so that the drying effect is improved.

A layer of screen cloth 38 is arranged below the hot air pipe 37, a vibrator 39 can be arranged on the screen cloth 38, when the moisture in the wet material is reduced to a certain degree, the cohesive force between sand falls into the screw conveyor 2 from the screen cloth 38, and the vibrator 39 can further promote the falling speed of the sand to avoid sand blockage.

As shown in fig. 3, in a second structure of the pre-auxiliary drying device 3, on the basis of the first structure, the input end branch of the tail gas discharge pipe 36 is connected with a split pipe 40, the split pipe 40 is provided with an adjusting valve 41, and the blanking cylinders are mutually communicated through the split pipe 40.

The waste heat tail gas can directly enter the blanking cylinder through the shunt tube 40 and then ascend to enter the spiral circulation conveyor 31 to dry sand flowing circularly in the spiral circulation conveyor 31, and the flow of the waste heat tail gas entering the shunt tube 40 can be adjusted through the adjusting valve 41.

As shown in fig. 4, the third structure of the pre-auxiliary drying device 3 is that, based on the first structure, the blanking barrel comprises a first blanking barrel 34 and a second blanking barrel 35, the length of the first blanking barrel 34 is longer than that of the second blanking barrel 35, the first blanking barrel 34 is located between adjacent tail gas discharge pipes 36, and the second blanking barrel 35 is located right above the tail gas discharge pipes 36.

The first blanking cylinder 34 is inserted into sand and is positioned between adjacent tail gas discharge pipes 36, the sand right above the tail gas discharge pipes 36 is blocked by the tail gas discharge pipes 36, the falling speed is low, the sand drying speed between the adjacent tail gas discharge pipes 36 is high, the downward flow frequency is high, the local cavity frequency is high, so that wet materials can fall into the local cavity from the first blanking cylinder 34 quickly to fill, the characteristic of high drying speed and high flow speed of the part is fully utilized, the drying efficiency of the wet materials is improved, the second blanking cylinder 35 is positioned above the minimum required sand surface and is positioned right above the tail gas discharge pipes 36, when the sand surface falls, the wet materials in the second blanking cylinder 35 fill the position, and therefore the whole height of the sand surface can be ensured to be stable, and the stable efficiency of tail gas purification can be realized only when the sand surface is highly stable.

Working principle of the front auxiliary drying device 3 is as follows:

When sand in one blanking cylinder falls down, the wet sand in the spiral circulating conveyor 31 can be filled into the blanking cylinder immediately, so that the sand can be filled into each blanking cylinder as soon as possible, and the drying efficiency of the sand is improved while uniform distribution is realized;

The first blanking cylinder 34 is inserted into sand and is positioned between adjacent tail gas discharge pipes 36, the sand right above the tail gas discharge pipes 36 is blocked by the tail gas discharge pipes 36, the falling speed is low, the sand drying speed between the adjacent tail gas discharge pipes 36 is high, the downward flow frequency is high, the local cavity frequency is high, so that wet materials can fall into the local cavity from the first blanking cylinder 34 quickly to fill, the characteristic of high drying speed and high flow speed of the part is fully utilized, the drying efficiency of the wet materials is improved, the second blanking cylinder 35 is positioned above the minimum required sand surface and is positioned right above the tail gas discharge pipes 36, when the sand surface falls, the wet materials in the second blanking cylinder 35 fill the position, and therefore the whole height of the sand surface can be ensured to be stable, and the stable efficiency of tail gas purification can be realized only when the sand surface is highly stable.

When tail gas enters into sand wet materials through the tail gas discharge pipe 36 to be absorbed and purified, the tail gas can rise to enter into the spiral circulation conveyor 31 from the blanking barrel, and sand flowing in the spiral circulation conveyor 31 in a circulating way is dried, so that the drying effect is improved.

The sand is dried by the hot air pipe 37, the tail gas discharge pipe 36 is discharged into wet materials from the exhaust hole 361 at the bottom, and the wet materials absorb the waste heat of the tail gas to be dried while the tail gas is purified, the tail gas discharge pipe 36 is positioned above the hot air pipe 37 for ensuring that the tail gas can be contacted with the wet materials to improve the purifying effect;

The device is used for the preposed drying process in the sand wet material drying system, and can remove about 65-75% of moisture of the wet material.

As shown in fig. 9-10, the dryer is of a dryer structure, the dryer comprises a supporting seat 90, a rotatable outer cylinder 81 is arranged on the supporting seat 90, an inner cylinder 84 is coaxially arranged in the outer cylinder 81, an interlayer cavity between the outer cylinder 81 and the inner cylinder 84 is used for drying materials, the input end of the inner cylinder 84 is communicated with a second hot blast stove 7, the output end of the inner cylinder is connected with a tail gas pipeline 93 through a rotary joint, the tail gas pipeline 93 is directly or indirectly connected with the input end of the outer cylinder 81 through a pipeline, conveying blades 82 are distributed on the inner wall of the outer cylinder 81, cooling fins 83 axially arranged are arranged on the outer wall of the inner cylinder 84, the input end of the outer cylinder 81 is communicated with a feed inlet 87, and the output end of the outer cylinder is communicated with a discharge outlet 86.

Specifically, the dryer 8 further comprises a supporting seat 90, driving wheels 88 are arranged on the supporting seat 90, the driving wheels 88 are connected with a driving motor 89 through a chain or a belt, the driving wheels 88 are provided with two groups of two, each group of two driving wheels 88 respectively support two ends of the outer cylinder 81, an annular track or a toothed ring is arranged on the outer wall of the outer cylinder 81 to be matched with the driving wheels 88, the outer cylinder 81 is driven to rotate through the driving wheels 88, the inner cylinder 84 and the outer cylinder 81 can be mutually fixed to form synchronous rotation, at the moment, the inner cylinder 84 and the outer cylinder 81 are mutually connected through an internal connecting rod, two ends of the inner cylinder 84 are connected with other pipelines through rotary joints, if the outer cylinder 81 and the inner cylinder 84 are not mutually connected, only the outer cylinder 81 rotates, at the moment, the inner cylinder 84 does not rotate, no rotary joint is needed, one end of the inner cylinder 84 is connected with the second hot blast stove 7, and the other end of the inner cylinder 84 is connected with a pipeline for discharging tail gas;

The purpose of the inner cylinder 84 is to generate heat, spiral blades 85 can be designed in the inner cylinder 84 to improve the heat absorption effect of the inner cylinder 84 on hot air, and the pitch of the spiral blades 85 gradually increases from the input end to the output end of the inner cylinder 84 to improve the heat energy utilization rate and the temperature uniformity of the inner cylinder.

The inner wall of the outer cylinder 81 is provided with a heat preservation coating, so that the heat preservation and insulation effect can be improved, and the heat preservation coating can adopt nano ceramic particles.

The outer wall of the inner cylinder 84 is provided with cooling fins 83 for improving the cooling effect of the inner cylinder 84, a sandwich cavity between the outer cylinder 81 and the inner cylinder 84 is used for drying sand wet materials, and conveying blades 82 are uniformly distributed on the inner wall of the outer cylinder 81.

Simultaneously, the conveying blades 82 can drive the sand to move above the outer cylinder 81 along with the rotation of the outer cylinder 81 and then fall onto the inner cylinder 84, and the cooling fins 83 on the outer wall of the inner cylinder 84 can block the sand, so that the residence time of the sand on the inner cylinder 84 is prolonged, and the drying effect of the sand is improved.

The two ends of the outer cylinder 81 are respectively and rotatably connected with a first fixed cylinder 91 and a second fixed cylinder 92, the fixed cylinders are arranged on the supporting seat 90 and cannot rotate, a feed inlet 87 is arranged above the first fixed cylinder 91, a discharge outlet 86 is arranged at the bottom or end of the second fixed cylinder 92, an air outlet is arranged above the second fixed cylinder 92, and an inclined plate can be arranged in the first fixed cylinder 91 and used for guiding sand entering from the feed inlet 87 so that the sand falls into the outer cylinder 81.

As shown in fig. 11, in the bin structure, a baffle 16 is arranged in the bin 12, and an outlet of an air inlet pipe 15 is arranged below the baffle 16;

Specifically, the bin 12 is of a cavity structure and is used for containing sand and drying the sand at last, a feed port 17 and a bin top dust remover 11 are arranged at the top end of the bin 12, a discharge port is arranged at the bottom, a discharge conveying belt 18 is arranged below the discharge port, a baffle 16 is arranged in the middle of the bin 12 and is used for preventing the sand from falling into a pipe orifice of the air inlet pipe 15, an outlet of the air inlet pipe 15 is arranged below the baffle 16 and is used for discharging tail gas into the bin 12 for drying, and the baffle 16 is preferably of a circular arc plate and is of a hemispherical structure.

The output end of the outer cylinder 81 is communicated with the second dust remover 14 through a pipeline, the output end of the second dust remover 14 is communicated with the tail gas discharge pipe 36 through a pipeline, and the first dust remover 9 and the second dust remover 14 are generally cloth bag dust removers or cyclone dust removers.

The outlet of the inner cylinder 84 is communicated with the first dust remover 9 through a pipeline, and the output end of the first dust remover 9 is respectively connected with the input end of the outer cylinder 81 and the air inlet pipe 15 through a branch pipeline.

Sand transport process:

When sand in one blanking cylinder falls down, the wet sand in the spiral circulating conveyor 31 can be filled into the blanking cylinder immediately, so that the sand can be filled into each blanking cylinder as soon as possible, and the drying efficiency of the sand is improved while uniform distribution is realized;

The sand is dried by the hot air pipe 37, the tail gas discharge pipe 36 is discharged into wet materials from the exhaust hole 361 at the bottom, and the wet materials absorb the waste heat of the tail gas to be dried at the same time when the tail gas is purified by the wet materials, the tail gas discharge pipe 36 is positioned above the hot air pipe 37 for ensuring that the tail gas can be contacted with the wet materials to improve the purification effect;

The screw conveyor 2 conveys sand to the first lifting machine 4, falls into the transition hopper 5 and is conveyed into the dryer 8 through a conveying belt, the sand enters an outer cylinder 81 of the dryer 8 to roll and simultaneously moves forwards, and the inner cylinder 84 emits heat to heat and dry the sand, so that the dryer 8 can remove about 24-33% of water in the sand;

After the sand comes out of the dryer 8, the sand is conveyed to a bin 12 through a second lifting machine 10, tail gas is discharged from an air inlet pipe 15 in the bin 12, the sand is finally dried by utilizing the waste heat of the tail gas, the tail gas can be subjected to certain absorption and purification treatment in the bin 12, the bin 12 can remove about 1-2% of water remained in the sand, and finally the sand falls onto a discharge conveying belt 18 from the bottom of the bin 12 and is conveyed.

The hot air conveying process comprises the following steps:

The first hot air discharged by the first hot air furnace 1 enters a hot air pipe 37 to heat the hot air pipe 37, then enters an outer cylinder 81 through a pipeline to directly contact, heat and dry sand in the outer cylinder 81, and absorbs tail gas particles by the sand;

The hot air discharged by the second hot air furnace 7 enters an inner cylinder 84 of the dryer 8 to heat the inner cylinder 84, then enters the first dust remover 9 through a pipeline to be subjected to primary drying, then is split into two strands, one strand enters the storage bin 12 through the pipeline to carry out final drying on sand in the storage bin 12, carries out certain absorption and purification treatment on tail gas, and finally is discharged from a top dust remover 11 at the top end of the storage bin 12, and the other strand returns to an outer cylinder 81 of the dryer 8 through the pipeline and then is mixed with the first strand of hot air in the outer cylinder 81 to heat the sand in the outer cylinder 81, and finally enters the tail gas discharge pipe 36 together with the first strand of hot air to carry out heating and drying on wet materials and self purification treatment.

In the process of conveying the hot air through the pipeline, a fan can be arranged on the pipeline to promote the flow of the hot air.

The invention has the target effects of improving the drying productivity by more than one time, reducing the drying comprehensive cost by more than 50 percent and reducing the emission by more than 80 percent.

The analysis principle of the realization effect is as follows:

1. principle of emission reduction:

The traditional low-pressure large fan for drying has the air quantity of 1-5 ten thousand cubic per hour, and only 10% of the original air quantity is discharged after the invention is adopted, and a large amount of air returns to the front end of drying, so that the emission reduction effect reaches more than 80%. The pressure of the back-end cloth bag dust removing equipment is reduced by 90%, the cost of the dust removing equipment can be greatly reduced, the service life is prolonged, and the purpose of emission reduction is realized.

2. Principle of capacity improvement:

the inlet temperature of the front end of the traditional dryer is about 600 degrees, the middle is 300 degrees, and the tail exhaust air takes away the moisture by about 100 degrees. The invention can keep the whole temperature in the dryer at 300-400 deg. C, and the drying effect is doubled, and the drying yield is easily doubled, so the invention can increase the productivity by more than one time with the same equipment.

3. Principle of reducing comprehensive drying cost by more than 50 percent:

The invention uses the same heat value and the same raw materials, and the energy consumption is not increased by improving the productivity by one time, so that the comprehensive cost can be reduced by more than 50 percent.

4. Principle of auxiliary reduction of raw material cost:

The traditional drying equipment uses biomass particles, namely about 1000 yuan per ton of list price g, and the biomass can be directly combusted instead by adopting the invention, namely 300-400 yuan per ton of list price g, the heat value is equivalent to that of the biomass particles, and the price is reduced by more than half, so that the raw material cost is greatly reduced.

The dust content of the dried product is also greatly reduced compared with the traditional drying method.

Because the return air quantity is large, the cyclone dust collector is arranged on the return pipeline, and the return cyclone dust collection is repeated, so that the disposable dust collection device has a better dust collection effect than the traditional disposable dust collection.

In conclusion, the invention has obvious energy-saving effect, easily realizes the drying effect, improves the drying productivity by more than one time, greatly reduces the emission, reduces the comprehensive cost by 50 percent, has multiple purposes, and is worth popularizing greatly.

It should be noted that, in this document, the terms include, comprise, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The principles and embodiments of the present invention are described herein by applying specific examples, and the above examples are only used to help understand the method and core idea of the present invention. The foregoing is merely illustrative of the preferred embodiments of the invention, and it will be appreciated that numerous modifications, adaptations and variations of the invention can be made by those skilled in the art without departing from the principles of the invention, and that other features and advantages of the invention can be combined in any suitable manner, and that no improvement in the design or design of the invention is intended to be applied directly to other applications.

Claims (10)

1. The wet material three-section method drying system is characterized by comprising a front auxiliary drying device (3), a screw conveyer (2), a dryer (8) and a storage bin (12) which are sequentially connected according to a material processing procedure;

The front auxiliary drying device (3) comprises a box body (33), wherein a spiral circulating conveyor (31), a tail gas discharge pipe (36), a hot air pipe (37), a screen (38) and the spiral conveyor (2) are sequentially arranged in the box body (33) from top to bottom, an exhaust hole (361) is formed in the bottom of the tail gas discharge pipe (36), and a first blanking cylinder (34) inserted into wet materials is distributed at the bottom of the spiral circulating conveyor (31);

The dryer (8) comprises a rotatable outer barrel (81), an inner barrel (84) is arranged in the outer barrel (81), the input end of the inner barrel (84) is communicated with the second hot blast stove (7), conveying blades (82) are distributed on the inner wall of the outer barrel (81), one end of the outer barrel (81) is communicated with a feed inlet (87), and the other end of the outer barrel is communicated with a discharge outlet (86);

A baffle plate (16) is arranged in the storage bin (12), and an air inlet pipe (15) for discharging waste heat and tail gas is arranged below the baffle plate (16);

The input end of the hot blast pipe (37) is communicated with the first hot blast stove (1), and the output end of the hot blast pipe is communicated with the outer barrel (81) through a pipeline, the output end of the outer barrel (81) is communicated with the second dust remover (14) through a pipeline, and the output end of the second dust remover (14) is communicated with the tail gas discharge pipe (36) through a pipeline;

the outlet of the inner cylinder (84) is communicated with the first dust remover (9) through a pipeline, and the output end of the first dust remover (9) is respectively connected with the input end of the outer cylinder (81) and the air inlet pipe (15) through branch pipelines.

2. The three-stage wet material drying system according to claim 1, wherein the first hot air discharged from the first hot air furnace (1) enters a hot air pipe (37), the hot air pipe (37) is heated, then enters an outer barrel (81) through a pipeline, sand in the outer barrel (81) is dried, primary tail gas particle absorption and purification are realized by mixing sand with tail gas, then the first hot air enters a second dust remover (14) from the other end of the outer barrel (81), returns to a tail gas discharge pipe (36) through the pipeline, and is directly discharged into sand wet material from an exhaust hole (361) to finish absorption and purification;

The second hot air discharged by the second hot air furnace (7) enters an inner cylinder (84) of the dryer (8) to heat the inner cylinder (84), then enters a first dust remover (9) through a pipeline to be carried out, then branches into two parts, one part enters a storage bin (12) through the pipeline to carry out final drying on sand in the storage bin (12) and is mixed with the sand to realize absorption and purification, finally, the sand is discharged from a top dust remover (11) at the top end of the storage bin (12), the other part returns to an outer cylinder (81) of the dryer (8) through the pipeline and is mixed with the first hot air in the outer cylinder (81), the sand in the outer cylinder (81) is heated, and the sand and the first hot air are finally fed into an exhaust gas discharge pipe (36).

3. The wet material three-stage drying system according to claim 1, wherein the spiral circulation conveyor (31) comprises two conveying grooves (311) which are arranged side by side, spiral conveying shafts (312) are arranged in the conveying grooves (311), two ends of the two conveying grooves (311) are provided with mutually communicated communication ports (313), conveying directions of the two spiral conveying shafts (312) are different, and a feed hopper (32) is arranged above one conveying groove (311).

4. The wet material three-section method drying system according to claim 1, wherein the input end branch of the tail gas discharge pipe (36) is connected with a split pipe (40), an adjusting valve (41) is arranged on the split pipe (40), and the blanking cylinders are mutually communicated through the split pipe (40).

5. The wet material three-section method drying system according to claim 1 is characterized in that blanking barrels are distributed at the bottom of a conveying groove (311) of a spiral circulating conveyor (31), the blanking barrels comprise a first blanking barrel (34) and a second blanking barrel (35), the length of the first blanking barrel (34) is larger than that of the second blanking barrel (35), the first blanking barrel (34) is located between adjacent tail gas discharge pipes (36), and the second blanking barrel (35) is located right above the tail gas discharge pipes (36).

6. The wet material three-stage drying system according to claim 1, wherein the inner cylinder (84) is internally provided with spiral blades (85), and the outer wall of the inner cylinder (84) is provided with cooling fins (83) which are axially arranged.

7. The wet material three-section method drying system according to claim 1, wherein the output end of the screw conveyor (2) is connected with a first lifter (4), the output end of the first lifter (4) is provided with a transition hopper (5), a conveying belt is arranged below the transition hopper (5), the output end of the conveying belt is connected with the feeding hole (87), the discharging hole (86) is connected with a second lifter (10), and the second lifter (10) is connected with the feeding hole (17) of the storage bin (12).

8. The wet material three-stage drying system according to claim 1, wherein a top dust remover (11) is arranged at the upper end of the bin (12).

9. The wet material three-stage drying system according to claim 1, wherein the hot air pipe (37) is provided with an annular heat radiation plate (371).

10. A wet material three-stage drying system according to claim 1, characterized in that the screen (38) is provided with a vibrator (39) on the side.