CN110645777A - Drying system and working method thereof - Google Patents

Abstract

The invention relates to a drying system and a working method thereof, which are used for evaporating and collecting phosphorus in phosphorus mud and slag, treating residual liquid of calcium oxide or calcium chloride and benzoyl chloride, drying chemical finished products, comprehensively recovering three wastes, drying municipal sludge and the like. Its drying host computer includes: the mask comprises a mask body and a plurality of layers of annular cavities which are coaxial up and down and are arranged in the mask body; the gaps between the adjacent annular cavities are communicated through a blanking channel; the multilayer annular cavity is integrally arranged above a heat source; suction pipes are arranged in the gaps among the cavities, the inlets of the suction pipes are adjacent to the inner side ends of the gaps among the cavities, the outlets of the suction pipes are communicated with a vertical pipe, and the vertical pipe is communicated with a heat source through a suction machine. When the heat exchanger works, the heat medium moves upwards along the gap between the annular cavity and the inner wall of the cover body, and simultaneously, under the action of the suction machine, the heat medium is absorbed by the suction pipes, so that the heat medium enters the gap between the cavities and exchanges heat with the side walls of the annular cavities, and the heat medium returns to a heat source through the suction pipes, the vertical pipes and the suction machine in sequence.

Description

Drying system and working method thereof

Technical Field

The invention relates to a drying system of slurry or powder and a working method thereof, which can be applied to evaporation and collection of phosphorus in phosphorus mud and slag, treatment of calcium oxide or calcium chloride and residual liquid of benzoyl chloride, drying of chemical finished products, comprehensive recovery treatment of three wastes, drying of municipal sludge and the like.

Background

Chinese patent document CN103591780A discloses a continuous drying system for slurry or powder. It includes: the multi-layer annular cavity comprises a plurality of layers of annular cavities which are coaxially arranged up and down and a main shaft arranged on the central axis of each annular cavity; a plurality of scrapers respectively distributed in each annular cavity are fixed on the main shaft; an inter-cavity gap is formed between every two adjacent annular cavities and is connected with the annular cavities in a sealing mode through a blanking channel; the bottom of the bottom plate of each annular cavity is provided with an electric heating wire, or each annular cavity is arranged in a heating container; air deflectors are arranged in the gaps among the cavities, the outer edge of each air deflector is hermetically connected with the inner wall of the cover body, gaps are formed between the upper end surface and the lower end surface of each air deflector and the adjacent wall body of the adjacent annular cavity, and gaps are formed between the inner edge of each air deflector and the outer wall of the central channel; when the combustion furnace is adopted to heat each annular cavity, hot air generated by the combustion furnace enters the cover body from the bottom of the cover body; and then the hot air snakelike rises in the clearance between the cavities under the action of the air deflector and is finally discharged from an exhaust gas port at the top of the cover body.

The defects of the prior art are as follows: the annular cavity is heated by adopting electric heating, so that the problem of lower safety exists; when the heat conducting liquid or the combustion furnace is used for heating, the heat conducting liquid or hot air rises in a snake shape in the gaps between the cavities under the action of the air deflector, and the heat conducting liquid or the hot air is rapidly cooled in the snake-shaped rising process, so that the annular cavity on the middle upper layer is slowly heated, the temperature difference between the annular cavities on the middle lower layer and the upper layer is large, and the drying production efficiency and the reliability are low.

Secondly, when the slurry leakage device works initially, due to the fact that the temperature difference between the annular cavities of the middle-lower layer and the upper layer is large, the thermal expansion amplitude and the deformation difference of the annular cavities are large, cracks are prone to occurring at welding positions between the adjacent annular cavities, and then slurry leakage is prone to occurring.

And thirdly, the adjacent annular cavities are hermetically connected from top to bottom by welding, so that once a certain annular cavity is damaged, the steps of maintenance and replacement are complicated, and the cost is high.

How to rapidly and uniformly raise the temperature of each annular cavity and reduce the temperature difference of each annular cavity in the initial work is a technical problem to be solved in the field. In addition, how to facilitate the installation and maintenance of the whole host is also a technical problem to be solved.

Disclosure of Invention

The invention provides a drying system and a working method thereof, which are used for enabling the temperature of each annular cavity to rise rapidly and uniformly and reducing the temperature difference of each annular cavity when a drying host initially works.

In order to solve the above technical problem, the present invention provides a drying system, comprising a drying main machine; this dry host computer includes: the mask comprises a mask body and a plurality of layers of annular cavities which are coaxially arranged up and down and are arranged in the mask body; an inter-cavity gap is formed between every two adjacent annular cavities and communicated with each other through a blanking channel; the multilayer annular cavity is integrally arranged above a heat source; suction pipes (preferably distributed radially) are arranged in the gaps among the cavities, the inlets of the suction pipes are adjacent to the inner side ends of the gaps among the cavities, the outlets of the suction pipes are communicated with a vertical pipe, and the vertical pipe is communicated with the inlet of a suction machine; when the heat pump is in work, the heat source heats the medium, the formed heat medium is upward along the gap between the multilayer annular cavity and the inner wall of the cover body, and simultaneously, the suction pipes absorb the heat medium under the action of the suction machine, so that the heat medium enters the gap between the cavities and exchanges heat with the upper ring and the lower ring of each annular cavity, and then enters the vertical pipe through each suction pipe. According to the structure, through the active suction of the suction pipe, the heat medium (generally hot gas or hot oil) entering the gaps among the cavities directly comes from the heat source, so that compared with the prior art, the temperature difference of the heat medium entering the gaps among the cavities is small and basically close to the temperature of the heat medium in the heat source, the temperature of each annular cavity can be rapidly and uniformly increased, and the temperature difference of each annular cavity is reduced.

Preferably, the annular cavity comprises: the upper ring and the lower ring are connected with the side walls on the periphery of the upper ring and the lower ring in a sealing way (the upper ring is a plane circular ring or a truncated cone housing); the lower rings of the two adjacent annular cavities are in upper-lower sealing fit with the inner rings of the upper rings, and the blanking channel is arranged between the lower rings and the upper rings of the two adjacent annular cavities; the outlet of the suction machine is communicated with the heat source. During operation, the heat source heats the heat exchange medium, the formed heat medium is upward along the gap between the multilayer annular cavity and the inner wall of the cover body, and simultaneously, under the action of the suction machine, the suction pipes suck the heat medium, so that the heat medium enters the gap between the cavities and exchanges heat with the upper ring and the lower ring of each annular cavity, and the heat medium returns to the heat source through the suction pipes, the vertical pipe and the suction machine in sequence, thereby realizing the circulating heat exchange of the heat medium, reducing the energy consumption, and improving the heat exchange efficiency and the drying efficiency.

Further preferably, the bottom end of the stand pipe is connected with the inlet of the suction machine; the top end of the vertical pipe is connected with an exhaust gas port which is arranged at the top of the cover body and used for discharging exhaust gas of a heat source (the heat source is a combustion furnace for burning gas or coal) through a control valve. The control valve is arranged, so that the discharge amount of the heat exchange medium in the vertical pipe can be flexibly controlled according to actual conditions.

Furthermore, the drying system also comprises a main rotating shaft arranged on the central axis of the multilayer annular cavity; a plurality of scraping plates respectively distributed in each annular cavity are fixed on the main rotating shaft; the adjacent annular cavities are connected in a sealing mode from top to bottom through the central parts of the adjacent annular cavities, a central channel is formed in the center of each annular cavity, and the main rotating shaft is arranged in the central channel.

Further, a material inlet is formed in the annular cavity of the top layer, and a material outlet is formed in the bottom of the annular cavity of the bottom layer; the top of the cover body is provided with: the material inlet is communicated with the material inlet of the annular cavity at the top layer, and the gas outlet is used for discharging volatile matters from each annular cavity and is connected with a gas recovery pipe; the heat source is a combustion furnace (burning fuel gas or coal and other fuels), a waste gas port for discharging waste gas of the combustion furnace is arranged at the top part close to the cover body, and the heat medium is air; or the heat source is a container filled with heat conducting liquid, the heat medium is heat conducting liquid, and an electric heater is arranged in the container or the container is connected with an external heating system through a heat exchange pipeline. The waste gas port on the top of the cover body is connected with a waste gas treatment and heat energy recovery system to realize energy conservation and emission reduction.

Optionally, the annular cavity between the annular cavities of the top layer and the bottom layer is a middle cavity, and at least one middle cavity is provided with an exhaust passage communicated with the middle cavity; a small rotating shaft is axially arranged in the exhaust channel, a stirring rod (used for preventing materials from caking and blocking the exhaust channel) for loosening the materials is distributed on the front section of the small rotating shaft extending into the middle cavity, and first spiral blades are distributed on the rear section of the small rotating shaft and are used for detaining the materials through rotation so as to prevent the slurry or powder in the middle cavity from being discharged through the exhaust channel; part of gas in the middle cavity is discharged into the gas recovery pipe from the exhaust passage; and the exhaust port of the gas recovery pipe is connected with a recovery tank for recovering volatile matters after passing through the cooling spray tower so as to collect the volatile matters such as phosphorus or benzoyl chloride.

Furthermore, a second helical blade is arranged on the main rotating shaft, and when the main rotating shaft rotates, the second helical blade is suitable for conveying the slurry or powder at the middle lower part of the main rotating shaft to the middle upper part of the main rotating shaft.

Further optional scheme is, the below of the discharge gate of the annular cavity of bottom links to each other with a screw rod discharging device's pan feeding mouth, and this screw rod discharging device includes: the screw rod is arranged in the discharge pipeline, only the front section of the screw rod is distributed with helical blades, the rear section of the screw rod is a shaft lever, a compression spring and a pressing plate are sleeved on the shaft lever, and the pressing plate is arranged at the front end of the compression spring; a discharge opening is arranged on the discharge pipeline below the compression spring, and a discharge valve is connected below the discharge opening; when the compression spring is in a natural state, the pressure plate is positioned on the front side of the discharging opening; the rear end of the screw is connected with a motor driving device or a driving wheel. When the material in the discharging pipeline is less, the pressing plate is positioned on the front side of the discharging opening under the action of the compression spring; the pressing plate gradually moves backwards along with the gradual increase of the materials in the discharging pipeline until the pressing plate moves to the discharging opening, and at the moment, the materials begin to fall from the discharging opening; at the moment, the discharge valve is opened, and the discharge can be realized; along with less material in the discharging pipeline, the lower pressure plate is restored to the front side of the discharging opening under the action of the compression spring, and the material is filled in the discharging pipeline on the front side of the lower pressure plate and is compacted, so that the automatic sealing of the discharging channel is realized, and the gas leakage is avoided.

Optionally, a plurality of reinforcing ribs distributed radially are distributed on the upper ring and/or the lower ring of the annular cavity of the top layer and the bottom layer, connecting sleeves are fixed at the outer ends of the reinforcing ribs, the vertically aligned connecting sleeves are longitudinally movably sleeved on a connecting shaft, a spring is sleeved at the upper end and/or the lower end of the connecting shaft, and a locking nut at the outer end of the spring is in threaded fit with the end part of the connecting shaft; the connecting shafts are provided with at least 3 connecting shafts which are uniformly distributed around each annular cavity. By adopting the structure, the upper and lower adjacent annular cavities are not required to be connected through welding and sealing, and the upper and lower sealing matching of the adjacent annular cavities can be realized only by installing the high-temperature-resistant sealing ring on the corresponding interface. In operation, the annular chambers are subject to thermal expansion and the springs are compressed to give a corresponding margin of expansion. When the system is shut down, the pressure of the spring can ensure that each annular cavity is still in an upper and lower sealing matching state, and the reliability is high. Secondly, once a certain annular cavity is damaged, each locking nut on the top can be replaced as long as the locking nut is loosened, so that the maintenance is convenient and fast, and the cost is low; in the same way, the machine is convenient to disassemble and clean. And thirdly, when the annular cavity is installed and replaced, welding is not needed, the production and maintenance cost is reduced, the risk of environmental damage is reduced, and the safety of the production and maintenance process is improved.

Furthermore, a feeding port at the top of the cover body is connected with a longitudinal pipe, the top end of the longitudinal pipe is communicated with a slurry conveying pump through a pipeline, a downward-inclined overflow pipe is arranged in the middle of the longitudinal pipe, and an inlet of the conveying pump and an outlet of the overflow pipe are connected with a slurry pool; the structure can prevent the problem of slurry overflow at the feeding port at the top of the cover body.

The preferable to above-mentioned each scheme, the length direction of 1 to 4 blanking mouths on the bottom plate in the annular cavity is along radial distribution, and when the scraper blade was worked at a certain angle promptly, the length direction of blanking mouth was suitable for and is unanimous with the length direction of scraper blade, and when the scraper blade promoted the material and rotated to this blanking mouth department, the material that radially distributes was suitable for synchronous whereabouts, for the blanking mouth of other distribution modes, can avoid the material to block up the blanking mouth, ensures that the volatile substance rises through this blanking mouth. Each blanking port is connected with an opening on the top plate of the annular cavity at the lower layer through the blanking channel; the openings on the top plate and the blanking ports on the bottom plate of the annular cavity at the lower layer are distributed in a staggered mode so as to ensure that the materials are suitable for drying layer by layer.

The working method of the drying system comprises the following steps:

A. the heat source heats each annular cavity;

B. inputting slurry or powder into the annular cavity at the top layer, and simultaneously rotating the main rotating shaft;

C. under the rotation action of each layer of scraping plate, the slurry or powder falls to the lower annular cavity through the blanking channel to realize layer-by-layer heat exchange and drying, and is finally discharged from the discharge port of the annular cavity at the bottom layer; and the volatile matters are evaporated layer by layer, go upwards and are output from the gas outlet and the exhaust passage, and the volatile matters are collected through a gas recovery pipe and a gas collection system in sequence.

Preferably, the slurry or powder is phosphorus mud or phosphorus slag; the volatile is phosphorus.

Compared with the prior art, the invention has the following advantages: (1) when the drying main machine works, the heat source heats the medium, the formed heat medium is upward along the gap between the multilayer annular cavity and the inner wall of the cover body, and simultaneously, under the action of the suction machine, the suction pipes absorb the heat medium, so that the heat medium enters the gap between the cavities and exchanges heat with the upper ring and the lower ring of each annular cavity, and then enters the vertical pipe through each suction pipe. According to the structure, through the active suction of the suction pipe, the heat medium (generally hot gas or hot oil) entering the gaps among the cavities directly comes from the heat source, so that compared with the prior art, the temperature difference of the heat medium entering the gaps among the cavities is small and basically approaches to the temperature of the heat medium in the heat source, the temperature of each annular cavity can be rapidly and uniformly increased, and the temperature difference of each annular cavity is reduced; the dried slurry or powder is dry powder and is discharged from the bottom in real time; the annular cavities can reach the required working temperature basically and simultaneously, so that the preheating and synchronization time is saved, and the production efficiency is higher; the suction pipe enables the quick heating part to be discharged, and the heat exchange speed is accelerated by partial circulation; (2) each annular cavity is elastically fixed up and down through a plurality of connecting shafts, and is in sealing fit with the upper and the lower parts of each annular cavity without being connected through welding and sealing. When the system is shut down, the pressure of the spring can ensure that each annular cavity is still in an upper and lower sealing matching state, and the reliability is high. Secondly, once a certain annular cavity is damaged, each locking nut on the top can be replaced as long as the locking nut is loosened, so that the maintenance is convenient and fast, and the cost is low; in the same way, the machine is convenient to disassemble and clean. And thirdly, when the annular cavity is installed and replaced, welding is not needed, the production and maintenance cost is reduced, the risk of environmental damage is reduced, and the safety of the production and maintenance process is improved. And can prevent the potential safety hazard caused by overhigh air pressure in each annular cavity. The preferable scheme is that all the annular cavities are synthesized in an assembling mode, each annular cavity is synthesized by an upper half cavity and a lower half cavity and is in sealing fit, the bottom of the furnace chamber is tied by screws, the screws penetrate through the upper cover to tighten the upper part of each screw, and a high-strength warewash is arranged on the upper part of each screw to balance the thermal expansion and cold contraction of each layer of the furnace chamber (3), and the adopted screw discharging device compresses dry material powder in a discharging pipeline, so that the self-sealing of discharging can be realized, the gas leakage is avoided, and the discharge of inflammable gases such as phosphorus steam and the like or the discharge of harmful gases is avoided.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments taken in conjunction with the accompanying drawings, in which

Fig. 1 is a schematic structural view of a drying main machine in embodiments 1 to 2;

FIG. 1-1 is a schematic view of a portion of the drying main machine shown in FIG. 1;

FIG. 2 is a schematic view of the structure of the drying system in examples 1 to 2;

FIG. 3 is a schematic cross-sectional view of a multi-layer annular chamber of the drying main machine in FIG. 1;

FIG. 4 is a bottom view of the annular chamber of the present invention;

FIG. 5 is a schematic cross-sectional view of a screw discharging device of the drying main machine according to the present invention;

FIG. 6 is a schematic view of the discharge cross-section of the screw discharge device of FIG. 5;

FIG. 7 is a schematic cross-sectional view of a small spindle in the main drying machine according to the present invention;

FIG. 8 is a schematic view of an overflow prevention mechanism in the drying main body of the present invention;

FIG. 9 is a schematic cross-sectional view of the multi-layer annular cavity of the drying main machine fixed by a connecting shaft;

fig. 10 is a schematic cross-sectional structure view of the ring cavity divided into an upper half cavity and a lower half cavity which are vertically matched and then fixed by a connecting shaft on the basis of fig. 9.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1

Referring to fig. 1 to 3, the present embodiment provides a system for drying slurry or powder, including: the drying main machine 100 and a collection system which is connected with the air outlet of the drying main machine 100 and is used for collecting volatile matters.

The drying main body 100 includes: the device comprises a cover body 27, a plurality of layers of annular cavities 2 and a main rotating shaft 1, wherein the annular cavities 2 and the main rotating shaft 1 are coaxially arranged up and down in the cover body 27; the main rotating shaft 1 is arranged in the central through hole of each annular cavity 2 in a penetrating way, and scraping plates 3 distributed in each annular cavity 2 one by one are fixed on the main rotating shaft 1; an intercavity gap 5 is arranged between two adjacent annular cavities 2.

Two adjacent annular cavities 2 are communicated with each other in a sealing way through a blanking channel 4; the upper and lower adjacent inner rings of two adjacent annular cavities 2 are in sealing fit, and the multilayer annular cavities 2 are integrally arranged above a combustion furnace 14 (for burning fuel gas or coal and other fuels); the annular cavity of the top layer is provided with a material inlet, and the bottom of the annular cavity of the bottom layer is provided with a discharge hole for discharging dried slurry or powder.

The annular cavity 2 comprises: an upper ring, a lower ring and a side wall which is connected with the periphery of the upper ring and the lower ring in a sealing way (the upper ring is a plane circular ring, as shown in figure 1-1, or is a truncated cone cover, as shown in an annular cavity 2 in figure 9); the lower rings of the two upper and lower adjacent annular cavities 2 are in upper and lower sealing fit with the inner ring of the upper ring, and the blanking channel 4 is arranged between the lower rings and the upper rings of the two upper and lower adjacent annular cavities.

Suction pipes 6 (preferably radially distributed) are arranged in each inter-cavity gap 2, an inlet 6-1 of each suction pipe 6 is adjacent to the inner side end of the inter-cavity gap 5, an outlet of each suction pipe 2 is communicated with a vertical pipe 8, and the vertical pipe 8 is communicated with an inlet of a suction machine 16 (preferably a high-temperature resistant exhaust fan or a circulating fan).

The scraping plate 3 is suitable for being tightly attached to the top surface of the bottom plate (namely the lower ring) of the annular cavity 2 so as to prevent scale layers from forming on the bottom plate and influencing the heat-conducting property of the bottom plate.

The gas recovery pipe 7 is connected to a recovery tank 11 for recovering volatile matters after passing through a cooling spray tower 10 to collect phosphorus or benzoyl chloride, etc.

The lower part of the discharge port is connected with a feeding port of a screw discharging device 12, and the discharging speed can be controlled in real time by controlling the working state of the screw discharging device 12.

3 or 4 blanking ports 2-2 are arranged on the bottom plate of the upper annular cavity 2 in the two adjacent annular cavities 2; the length direction of each blanking port 2-2 is distributed along the radial direction and in central symmetry, namely when the scraper works at a certain angle, the length direction of the blanking port 2-2 is suitable for being consistent with the length direction of the scraper 3, when the scraper 3 pushes the material to rotate to the blanking port 2-2, the material distributed along the radial direction is suitable for synchronously falling, compared with the blanking ports adopting other distribution modes, the material blocking of the blanking port 2-2 can be avoided, and the volatile matter is ensured to rise through the blanking port 2-2.

Each blanking port 2-2 is connected with an opening 2-1 on the top plate of the lower annular cavity through the blanking channel 4; the opening 2-1 on the top plate and the blanking port 2-2 on the bottom plate of the annular cavity at the lower layer are distributed in a staggered mode so as to ensure that the materials are suitable for drying layer by layer.

The top of the cover body 27 is provided with: a feed inlet communicating with the material inlet of the top annular chamber (the feed inlet being connected to a screw conveyor 28 or slurry transfer pump), and a gas outlet 29 for the discharge of volatiles from each annular chamber, the gas outlet 29 being connected to a gas recovery tube 7.

The outlet of the suction machine 16 communicates with the furnace 14. The bottom end of the stand pipe 8 is connected with the inlet of the suction machine 16; the top end of the riser pipe 8 is connected to an exhaust gas port 27-1 for discharging exhaust gas from the combustion furnace 14 at the top of the hood 27 through a control valve 8-1. The waste gas port 27-1 is connected with a waste gas treatment and heat energy recovery system to realize energy conservation and emission reduction. The control valve 8-1 is arranged, so that the discharge amount of the heat exchange medium in the vertical pipe can be flexibly controlled according to actual conditions.

The exhaust-gas treatment and heat energy recovery system comprises: air heat exchange tower 17 and exhaust treatment system 32; the hot waste gas exhausted from the waste gas port 27-1 is input from a hot waste gas input port of an air heat exchange tower 17, passes through a heat exchange pipe in the air heat exchange tower 17, is exhausted to a waste gas treatment system 32 through an exhaust fan, and the fresh air input into the air heat exchange tower 17 exchanges heat with the heat exchange pipe and is input into the combustion furnace 14, so that the combustion heat value of the fuel in the combustion furnace 14 is improved, and energy conservation is realized.

In operation, hot air formed by the combustion furnace 14 is upward along the gap between the multi-layer annular cavity 2 and the inner wall of the cover 27, and simultaneously, under the action of the suction machine 16, each suction pipe 6 sucks the hot air, so that the hot air enters the gap 5 between each cavity, exchanges heat with the upper ring and the lower ring of each annular cavity 2, and then enters the vertical pipe 8 through each suction pipe 6. According to the structure, the hot air entering the gaps 5 among the cavities is directly from the combustion furnace 14 through the active suction of the suction pipe 6, so that compared with the prior art, the temperature difference of the heat medium entering the gaps among the cavities is small, the temperature of each annular cavity 2 can be rapidly and uniformly increased, and the temperature difference of each annular cavity 2 is reduced.

Meanwhile, the hot air returns to the combustion furnace 14 through the suction pipes 6, the vertical pipe 8 and the suction machine 16 in sequence, so that the circulating heat exchange of the heat medium is realized, the energy consumption is reduced, and the heat exchange efficiency and the drying efficiency are improved.

The drying system is applied to evaporation and collection of phosphorus in phosphorus mud and slag, treatment of residual liquid of calcium oxide or calcium chloride and benzoyl chloride, drying of chemical finished products, comprehensive recovery treatment of three wastes, drying of municipal sludge and the like.

Example 2

On the basis of embodiment 1, the present embodiment has the following improvements:

as shown in fig. 5 to 6, the screw discharging device 12 includes: the discharge pipeline 121 is a screw 122 arranged in the discharge pipeline 121, only the front section of the screw 122 is distributed with helical blades, the rear section of the screw 122 is a shaft rod, a compression spring 123 and a pressure plate 124 are sleeved on the shaft rod, and the pressure plate 124 is arranged at the front end of the compression spring 123; a discharge opening is arranged on the discharge pipeline below the compression spring 123, and a discharge valve 125 is connected below the discharge opening; when the compression spring is in a natural state, the pressure plate 124 is positioned at the front side of the discharging opening; the rear end of the screw 122 is connected to a motor drive 126 or a drive wheel. When the material in the discharge pipe 121 is less, the pressure plate 124 is positioned at the front side of the discharge opening under the action of the compression spring; as the amount of material in the discharge conduit increases, the platen 124 moves back gradually until it reaches the discharge opening, at which time the material begins to fall from the discharge opening; at this time, the discharge valve 125 is opened, and the discharge can be realized; along with less material in the discharging pipeline 121, the lower pressure plate is restored to the front side of the discharging opening under the action of the compression spring, and the material is filled in the discharging pipeline on the front side of the lower pressure plate and is compacted in the process, so that the automatic sealing of the discharging channel is realized, and the gas leakage is avoided.

Example 3

As shown in fig. 1 and 7, on the basis of the foregoing embodiment 1 or 2, the drying system of the present embodiment further includes: the annular cavity between the annular cavities of the top layer and the bottom layer is a middle cavity, and at least one middle cavity is provided with an exhaust channel communicated with the middle cavity; a small rotating shaft 9 is axially arranged in the exhaust channel, a stirring rod 91 (for preventing materials from caking and blocking the exhaust channel) for loosening the materials is distributed on the front section of the small rotating shaft extending into the middle cavity, a first helical blade 92 is distributed on the rear section of the small rotating shaft 9, and the first helical blade 92 retains the materials by rotating so as to prevent the slurry or powder in the middle cavity from being discharged through the exhaust channel; part of the gas in the intermediate chamber is discharged from the exhaust passage into the gas recovery pipe 7. The rear end of the small rotating shaft 9 is provided with a motor driving mechanism.

The main rotating shaft 1 is provided with a second helical blade 1-1, and when the main rotating shaft rotates, the second helical blade is suitable for conveying slurry or powder at the middle lower part of the main rotating shaft to the middle upper part of the main rotating shaft.

Example 4

On the basis of one of the above embodiments 1 to 3, the drying system of the present embodiment further includes: as shown in fig. 3 to 4, a plurality of reinforcing ribs 2-1 distributed radially are distributed on the upper ring and/or the lower ring of the annular cavity 2 at least at the top layer and the bottom layer, the outer side ends of the reinforcing ribs 2-1 are fixed with connecting sleeves 2-3, the connecting sleeves 2-3 aligned up and down are longitudinally movably sleeved on a connecting shaft 2-4, the upper end and/or the lower end of the connecting shaft 2-4 is sleeved with a spring 2-5, and the end part of the connecting shaft 2-4 is provided with a locking nut 2-6 positioned at the outer side end of the spring 2-5; the connecting shafts 2-4 are provided with at least 3 connecting shafts which are uniformly distributed around each annular cavity. By adopting the structure, the upper and lower adjacent annular cavities 2 are not required to be connected through welding and sealing, and only the high-temperature-resistant sealing rings are required to be arranged on the corresponding interfaces, so that the upper and lower sealing cooperation of the adjacent annular cavities can be realized.

When the device is assembled, the locking nuts 2-6 compress the springs 2-5, so that the annular cavities are fixedly matched up and down. Optionally, a limiting pipe is sleeved on the connecting shaft 2-4 and between two adjacent connecting sleeves 2-3 to limit the size of the gap between the cavities. The size of the gap between the cavities can be supported and limited by the blanking channel 4.

When the expansion device works, each annular cavity 2 is heated to expand, and the springs on the connecting shafts 2-4 are compressed to give corresponding expansion allowance. When the system is shut down, the pressure of the spring can ensure that each annular cavity is still in an upper and lower sealing matching state, and the reliability is high. Secondly, once a certain annular cavity is damaged, each locking nut on the top can be replaced as long as the locking nut is loosened, so that the maintenance is convenient and fast, and the cost is low; in the same way, the machine is convenient to disassemble and clean. And thirdly, when the annular cavity is installed and replaced, welding is not needed, the production and maintenance cost is reduced, the risk of environmental damage is reduced, and the safety of the production and maintenance process is improved.

As shown in fig. 8, when a pump is used to deliver slurry, a feeding port is arranged at the top of the cover 27, a longitudinal pipe 30 is connected to the feeding port, the top end of the longitudinal pipe 30 is connected to a slurry delivery pump through a pipeline, a downward-inclined overflow pipe 31 is arranged in the middle of the longitudinal pipe 30, and the inlet of the delivery pump and the outlet of the overflow pipe are connected to a slurry tank; the structure can prevent the problem of slurry overflow at the feeding port at the top of the cover body.

Example 5

On the basis of one of the above embodiments 1-4, in the drying system of this embodiment, the length directions of 1 to 4 blanking ports 2-2 on the bottom plate in the annular cavity 2 are distributed along the radial direction, that is, when the scraper works at a certain angle, the length direction of the blanking port 2-2 is adapted to be consistent with the length direction of the scraper 3, when the scraper 3 pushes the material to rotate to the blanking port 2-2, the material distributed along the radial direction is adapted to fall synchronously, and compared with the blanking ports of other distribution modes, the material can be prevented from blocking the blanking port, and the volatile matter is ensured to rise through the blanking port. Each blanking port is connected with an opening on the top plate of the annular cavity at the lower layer through the blanking channel; the openings on the top plate and the blanking ports on the bottom plate of the annular cavity at the lower layer are distributed in a staggered mode so as to ensure that the materials are suitable for drying layer by layer.

The working method of the drying system comprises the following steps:

A. the furnace 14 heats each annular chamber;

B. inputting slurry or powder into the annular cavity at the top layer, and simultaneously rotating the main rotating shaft;

C. under the rotation action of each layer of scraping plate, the slurry or powder falls to the lower annular cavity through the blanking channel to realize layer-by-layer heat exchange and drying, and is finally discharged from the discharge port of the annular cavity at the bottom layer; and the volatile matters are evaporated layer by layer, go upwards and are output from the gas outlet and the exhaust passage, and the volatile matters are collected through a gas recovery pipe and a gas collection system in sequence.

The slurry or powder is phosphorus mud or phosphorus slag; the volatile is phosphorus.

Example 6

On the basis of the above embodiment 4, the drying system of the present embodiment has the following modifications: the annular cavity is divided into an upper cavity and a lower cavity, the matching surfaces of the upper cavity and the lower cavity are provided with sealing rings, the upper cavity and the lower cavity are fixed by bolts around the upper cavity and the lower cavity, and then the upper cavity and the lower cavity are fixedly and hermetically matched by connecting shafts 2-4.

Or, as shown in fig. 10, the annular cavity is divided into an upper cover body and an annular chassis, the upper cover body and the annular chassis are in upper-lower sealing fit, the upper cover body and the annular chassis are fixed by bolts at the periphery, and then the upper half cavity and the lower half cavity are in fixed sealing fit by connecting shafts 2-4.

The annular cavity of this embodiment is installed, is dismantled conveniently, is convenient for regularly change or clearance.

Example 7

On the basis of one of the embodiments 1 to 6, the drying system of the present embodiment has the following modifications:

the heat source is replaced by a container containing heat-conducting liquid from the combustion furnace 14, the heat medium is the heat-conducting liquid, and an electric heater is arranged in the container or the container is connected with an external heating system through a heat exchange pipeline. The waste gas treatment and heat energy recovery system can be omitted, the control valve 8-1 is normally closed, and the suction machine 16 is a high-temperature-resistant pump.

It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.

Claims (10)

1. A drying system comprises a drying main machine, wherein the drying main machine comprises: the mask comprises a mask body and a plurality of layers of annular cavities which are coaxially arranged up and down and are arranged in the mask body;

an inter-cavity gap is formed between every two adjacent annular cavities and communicated with each other through a blanking channel;

the multilayer annular cavity is integrally arranged above a heat source; it is characterized in that the preparation method is characterized in that,

suction pipes are arranged in the gaps among the cavities, the inlets of the suction pipes are adjacent to the inner side ends of the gaps among the cavities, the outlets of the suction pipes are communicated with a vertical pipe, and the vertical pipe is communicated with the inlet of a suction machine.

2. The drying system of claim 1, wherein: the annular cavity includes: the upper ring and the lower ring are connected with the side wall on the periphery of the upper ring and the lower ring in a sealing way;

the lower rings of the two adjacent annular cavities are in upper-lower sealing fit with the inner rings of the upper rings, and the blanking channel is arranged between the lower rings and the upper rings of the two adjacent annular cavities;

the outlet of the suction machine is communicated with the heat source;

when the heat exchanger works, the heat source heats a heat exchange medium, the formed heat medium is upward along the gap between the multilayer annular cavity and the inner wall of the cover body, and simultaneously, the suction pipes suck the heat medium under the action of the suction machine, so that the heat medium enters the gap between the cavities and exchanges heat with the upper ring and the lower ring of each annular cavity, and the heat medium returns to the heat source through each suction pipe, the vertical pipe and the suction machine in sequence.

3. The drying system of claim 2, wherein: the main rotating shaft is arranged on the central axis of the multilayer annular cavity;

a plurality of scraping plates respectively distributed in each annular cavity are fixed on the main rotating shaft; the adjacent annular cavities are connected in a sealing mode from top to bottom through the central parts of the adjacent annular cavities, a central channel is formed in the center of each annular cavity, and the main rotating shaft is arranged in the central channel.

4. The drying system of claim 3, wherein: a material inlet is arranged on the annular cavity of the top layer, and a discharge outlet is arranged at the bottom of the annular cavity of the bottom layer;

the top of the cover body is provided with: the material inlet is communicated with the material inlet of the annular cavity at the top layer, and the gas outlet is used for discharging volatile matters from each annular cavity and is connected with a gas recovery pipe;

the heat source is a combustion furnace, and an exhaust gas port for discharging exhaust gas of the combustion furnace is arranged at the top part close to the cover body; or the like, or, alternatively,

the heat source is a container filled with heat-conducting liquid, and an electric heater is arranged in the container or is connected with an external heating system through a heat exchange pipeline.

5. The drying system of claim 4, wherein: the annular cavity between the annular cavities of the top layer and the bottom layer is a middle cavity, and at least one middle cavity is provided with an exhaust channel communicated with the middle cavity;

a small rotating shaft is axially arranged in the exhaust channel, a stirring rod for loosening materials is distributed on the front section of the small rotating shaft extending into the middle cavity, a first helical blade is distributed on the rear section of the small rotating shaft, and the first helical blade retains the materials through rotation so as to prevent slurry or powder in the middle cavity from being discharged through the exhaust channel; part of gas in the middle cavity is discharged into the gas recovery pipe from the exhaust passage; and an exhaust port of the gas recovery pipe is connected with a recovery tank for recovering volatile matters after passing through the cooling spray tower.

6. The system for continuous drying of slurry or powder according to claim 4, characterized in that: and the second helical blade is suitable for conveying the slurry or powder at the middle lower part of the main rotating shaft to the middle upper part of the main rotating shaft when the main rotating shaft rotates.

7. The system for continuous drying of slurry or powder according to claim 4, characterized in that: the below of the discharge gate of the annular cavity of bottom links to each other with a screw rod discharging device's pan feeding mouth, and this screw rod discharging device includes: the screw rod is arranged in the discharge pipeline, only the front section of the screw rod is distributed with helical blades, the rear section of the screw rod is a shaft lever, a compression spring and a pressing plate are sleeved on the shaft lever, and the pressing plate is arranged at the front end of the compression spring; a discharge opening is arranged on the discharge pipeline below the compression spring, and a discharge valve is connected below the discharge opening; when the compression spring is in a natural state, the pressure plate is positioned on the front side of the discharging opening;

the rear end of the screw is connected with a motor driving device or a driving wheel.

8. Drying system according to one of claims 1 to 3, characterized in that: a plurality of reinforcing ribs which are distributed in the radial direction are distributed on the upper ring and/or the lower ring of the annular cavity at least at the top layer and the bottom layer, connecting sleeves are fixed at the outer side ends of the reinforcing ribs which are distributed in the same side in an up-down alignment manner, each connecting sleeve which is aligned in the up-down alignment manner is longitudinally movably sleeved on a connecting shaft, a spring is sleeved at the upper end and/or the lower end of the connecting shaft, and a locking nut which is positioned at the outer side end of the spring is matched at the end part;

the connecting shafts are provided with at least 3 connecting shafts which are uniformly distributed around each annular cavity.

9. Drying system according to one of claims 1 to 3, characterized in that: the feeding port at the top of the cover body is connected with a longitudinal pipe, the top end of the longitudinal pipe is communicated with a slurry conveying pump through a pipeline, the middle part of the longitudinal pipe is provided with an overflow pipe which inclines downwards, and the inlet of the conveying pump and the outlet of the overflow pipe are connected with a slurry pool.

10. A method of operating a drying system according to any one of claims 1 to 5, characterised in that it comprises:

A. the heat medium heats each annular cavity;

B. inputting slurry or powder into the annular cavity at the top layer, and simultaneously rotating the main rotating shaft;

C. under the rotation action of each layer of scraping plate, the slurry or powder falls to the lower annular cavity through the blanking channel to realize layer-by-layer heat exchange and drying, and is finally discharged from the discharge port of the annular cavity at the bottom layer; and the volatile matters are evaporated layer by layer, go upwards and are output from the gas outlet and the exhaust passage, and the volatile matters are collected through a gas recovery pipe and a gas collection system in sequence.

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