A drying apparatus, a system containing the drying apparatus and a method of using the same

Abstract

The present application relates to heat treatment and equipment technical field, especially to a kind of drying device, system containing drying device and its use method;Use method includes the following steps: S1, after material metering, execute feeding operation, material is fed from the top of drying device;S2, utilize material self weight impact itself, disperse material;Air flow and material contact heat exchange;Complete preliminary classification, final heat exchange, part of material is dried, powder is raised with air flow;S3, the remaining block material continues to fall, when passing through the neck, material collides and is smashed again;After separating material, powder is raised with air flow, block material falls into slag pocket;S4, powder is carried out drying device by air flow, enters dust removal device, completes finished product collection, and exhaust gas after purification is evacuated;Material vertically enters and exits, can avoid material to form ball, block in rolling advance, dispersion effect is good, material surface area increases, heat exchange area is large, heat exchange efficiency is improved, and fuel consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment and equipment, in particular to a drying device, a system containing the drying device and a method for using the same. BACKGROUND

[0002] Drying is the process of dehydrating wet materials into dry materials, in which a large amount of heat needs to be absorbed. If the drying device or method is unreasonable, it will lead to waste of energy, and energy saving and emission reduction is the key support to achieve the goal of carbon peak and carbon neutralization on schedule.

[0003] Calcium carbide slag is a waste product of using calcium carbide to produce acetylene gas. It can be divided into wet and dry slag according to the different ways of slagging. The wet calcium carbide slag discharged from the acetylene generator has a water content of more than 90%. After concentration, the water content is still 70-80%, and after pressure filtration, the water content of the filter cake is about 35%. The calcium carbide slag has fine particles, with more than 80% of particles below 50 μm, high dispersion degree and strong water retention capacity. The main chemical component of calcium carbide slag is Ca(OH)2, with a little PH3 and H2S gas remaining, so it has a slight odor. Ca(OH)2 in calcium carbide slag can be decomposed into CaO by heating, so it can be used as a raw material for cement production. At present, the devices and methods for drying calcium carbide slag filter cake mainly have the following three ways:

[0004] (1) Using a rotary dryer

[0005] The material enters the dryer through the feeding device. Since the cylinder is in a slow rotary motion in an inclined state, the material moves from the high end to the low end in the axial direction. In the movement process, the material is continuously lifted, scattered and moved downward by the lifting plate in the circumferential direction, so that the material and air are fully heat exchanged until the dried material is discharged from the discharge device. As known, the thermal efficiency of the rotary dryer is low. In addition, the drying cylinder rotates at a low speed, and the material is not easy to separate from the drying cylinder. The calcium carbide slag rolls forward in the drying cylinder, forms spherical particles, and gradually becomes dense, so it needs to be re-ground to make raw material, which also causes high power consumption.

[0006] (2) Using a vertical mill

[0007] The vertical mill is used to extrude the material on the grinding disc by the grinding roller, and the particles meeting the fineness requirement are taken out of the mill by the airflow and collected by the dust collector to become finished products. In the vertical mill, the particles with larger particle size in the airflow fall back to the grinding disc under the action of gravity for grinding. This process needs to be repeated several times to make the fineness meet the requirements. In the grinding process, heat exchange is generated by the contact between gas and solid, and the wet material is dried. The thermal efficiency of using the vertical mill for drying is high.

[0008] However, the raw material for calcium carbide production is high-quality lime, which contains trace elements such as potassium, sodium, magnesium, phosphorus, and sulfur. Under the conditions of high temperature up to 2000°C and reducing atmosphere in the calcium carbide furnace, the MgO in the raw material is reduced to elemental form and escapes after gasification with K2O and Na2O. Phosphorus and sulfur combine with calcium and escape the system as PH3 and H2S gases during calcium carbide hydrolysis. During the process of obtaining acetylene gas from calcium carbide hydrolysis, calcium only serves as a carrier and is not consumed before and after the reaction. The above reasons cause the calcium hydroxide in calcium carbide slag to be relatively pure, so when batching, clay raw materials with high silicon content are required. Clay raw materials with high silicon content often have high crystalline silicon content, making the material difficult to grind. If a vertical mill is used to dry and grind the mixture (containing more than 60% calcium carbide slag), only a vertical mill can grind raw materials with a total moisture content of about 12% because of its strong drying capacity. However, when the raw material is difficult to grind, a vertical mill is not recommended, so the contradiction between drying capacity and grinding capacity makes the use of a vertical mill very awkward, resulting in an oversized system and high power consumption in actual application.

[0009] (3) Using a drying hammer crusher

[0010] The drying hammer crusher, also known as a drying hammer, is used to crush and dry soft and non-abrasive materials such as gypsum, chalk, clay, and slurry cake. It has the functions of breaking up and drying at the same time. The rotating rotor breaks up the material, hot air dries the material, and airflow carries the crushed and dried material to the separation chamber. Fine powder is then separated in the cyclone, and coarse particles are returned to the hammer crusher for further crushing.

[0011] The prior art CN217210023U discloses a high-moisture sticky material drying system, which comprises a drying hammer crusher, a settling chamber, a bag-type dust collector, a system fan, and a storage bin. The drying hammer crusher, the settling chamber, the bag-type dust collector, and the system fan are connected in sequence. The storage bin is arranged at the discharge end of the settling chamber and the bag-type dust collector to collect the crushed and dried material. According to the utility model, sticky materials can be quickly dried. The qualified dry powder material after drying and crushing flows out of the drying hammer crusher with the airflow. The wet material and large pieces that have not been dried and crushed continue to be dried and crushed in the drying hammer crusher. The frequency control device of the system fan can adjust the speed of the system fan, thereby adjusting the air volume of the system. The air speed at the air outlet of the drying hammer crusher can be changed to realize the classification of the finished particle size. The system does not need to be equipped with a separate powder classifier.

[0012] In the process of implementing the embodiments of the present application, the inventors have realized that: since carbide slag is light waste residue, it is easy to be suspended; the carbide slag itself has fine particles, and can be used for cement production without grinding, and the wet residue has viscosity but basically no strength after being pressed into filter cake; when the carbide slag is slowly dried, a hard shell is easily formed on the outside, which may generate certain strength and needs to be re-grounded, but under the condition of rapid drying, the filter cake will naturally disintegrate without strength due to the generation of internal water vapor, volume expansion and internal stress; the dried carbide slag filter cake basically does not generate adhesion, and even if it generates adhesion, it will fall off after being collided. Based on the above analysis and combined with production practice, the inventors have found that: when drying the carbide slag filter cake by using the prior art, at least the following defects exist: either high heat consumption or high power consumption, in general, the prior art has high energy consumption and is not energy-saving.

[0013] Therefore, it is urgent to provide a drying device, a system containing the drying device and a use method thereof, which solve the problems of high energy consumption and non-energy saving in the related art and achieve the beneficial effect of energy saving relative to the prior art. SUMMARY

[0014] The present application solves the technical problems existing in the prior art, and provides a drying device, a system containing the drying device and a use method thereof.

[0015] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0016] A drying device, which is equipped with a scale, the scale is connected with a feeding pipe located at the upper part of the drying device through a lock-wind feeder, and characterized in that it comprises a vertical cylinder, a dispersion cone, a cutter and a necking portion.

[0017] The cylinder is subjected to heat preservation treatment; the top end of the cylinder is connected with an air outlet; the end of the feeding pipe is coaxially arranged with the cylinder;

[0018] At least one fixed dispersion cone is installed below the discharge port of the feeding pipe inside the cylinder, the cutter is installed on the cone shell of the dispersion cone, and holes are distributed on the cone shell;

[0019] At least one necking portion is arranged inside the cylinder, and the cross-sectional area of the cylinder at the necking portion is reduced;

[0020] An air inlet is connected to the lower part of the cylinder, the airflow flows through the inside of the cylinder to complete heat exchange with the material and realize drying of the material;

[0021] A residue discharge hopper is connected to the lower part of the cylinder.

[0022] Further, the conical shell is connected with the peripheral wall of the cylinder through a support; a support is arranged on the peripheral wall of the cylinder, which is a ring support or an ear support; a manhole is arranged on the peripheral wall of the cylinder.

[0023] Further, the cutting knives are radially arranged from the center, and the cutting knives are deflected by 0-30 degrees along the radial direction; the top center of the conical shell is provided with a hole, and the conical shell between adjacent cutting knives is also provided with holes.

[0024] Further, a combustion nozzle is arranged on the peripheral wall of the cylinder.

[0025] Further, a hoist is further included, the feeding port of the hoist is connected with the end of the slag discharge hopper, and the discharging port of the hoist is connected with the feeding pipe.

[0026] Further, a slag discharge door is arranged at the bottom of the slag discharge hopper.

[0027] Further, a dust valve is arranged at the end of the slag discharge hopper.

[0028] A system containing a drying device, comprising the drying device, a first air inlet valve, a second air inlet valve and a dust removal device according to any one of the above;

[0029] The air inlet of the drying device is connected with the first air inlet valve;

[0030] The air outlet of the drying device is connected with the dust removal device, and then connected with an exhaust fan, and the exhaust fan is provided with the second air inlet valve;

[0031] The dust removal device is a settling chamber and / or a dust collector; the dust removal device is provided with a powder unloading device and / or a finished product conveyor.

[0032] Further, a circulating air pipe is arranged between the air outlet of the exhaust fan and the air inlet of the drying device, and a circulating air valve is arranged on the circulating air pipe.

[0033] A use method of a system containing a drying device, the system being as described above, and characterized in that the use method comprises the following steps:

[0034] In step S1, after the material is weighed, the material is fed from the top of the drying device by using a lock air feeder to perform a feeding operation;

[0035] In step S2, the material is dispersed by using the self-weight impact of the material; the gas flow exchanges heat with the material; the preliminary classification and the final heat exchange are completed under the assistance of the gas flow, and part of the material is dried, wherein the powder rises with the gas flow;

[0036] Step S3, the remaining block material continues to fall, when passing through the neck, the material is impacted and crushed again by the 'jet' effect generated by the neck; after separating the block material, the powder is lifted by the airflow; finally, the material still in block form falls into the slag discharge hopper;

[0037] Step S4, the powder is taken out of the drying device by the airflow and enters the dust removal device to complete the finished product collection, and the purified waste gas is discharged.

[0038] Further, the dust removal device comprises a settling chamber and / or a dust collector, which is a bag-type dust collector or an electric dust collector or a cyclone dust collector; the opening degree of the circulating air valve is adjusted according to the moisture content of the waste gas, the moisture content of the waste gas is controlled, and part of the waste gas is re-introduced into the system without dew in the dust collector.

[0039] Further, the feeding amount and the air temperature of the air outlet of the drying device constitute a closed loop control.

[0040] Further, when the moisture of the material is too large, causing insufficient heat of the system, fuel is sprayed from the combustion nozzle, and the fuel can supplement heat after combustion.

[0041] Further, block material is incorporated as a medium in the drying device, and the medium is recycled;

[0042] The medium is used for heat transfer enhancement, and / or grinding of the material, and / or elimination of the material wall sticking phenomenon.

[0043] Compared with the prior art, the beneficial effects of the present application are:

[0044] A dispersion cone is installed at the center position of the vertical cylinder, a plurality of fixed cutting knives are installed on the dispersion cone, the block material is cut by the cutting knives after colliding with the cutting knives, and then falls; when passing through the neck, the material is impacted and crushed again; the high-temperature airflow flows from bottom to top through the vertical cylinder, the material and the high-temperature airflow complete the heat exchange process in the cylinder, the powder is lifted by the airflow, and the finished product is collected. Because the above technical means are adopted, compared with the prior art, the present application can achieve the following beneficial effects:

[0045] (1) The material of the present application enters and exits vertically, which is different from the rotary dryer, and can avoid the material from being formed into balls and blocks in the rolling progress, the dispersion effect of the present application is good, the surface area of the material is increased, the heat exchange area is large, and the heat exchange efficiency is improved, so the fuel consumption can be reduced;

[0046] (2) Compared with the drying hammer crusher, in the present application, part of the material is taken away by the rising airflow after being dried, which is equivalent to early diversion, and the system installed power is reduced, so the electricity can be saved;

[0047] (3) In the prior art, the separator of the vertical mill, the grinding disc, or the rotor of the drying hammer crusher are rotating, and rotate at high speed in production. The dispersion cone and the cutter of the present application are fixed, and therefore the system has small installed power and can save electricity. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is the layout of embodiment 1 of the present application.

[0049] Figure 2 is the top view of the dispersion cone in embodiment 1 of the present application.

[0050] Figure 3 is Figure 2 is the sectional view along A-A direction in FIG. 4.

[0051] Figure 4 is the layout of the support in embodiment 1 of the present application.

[0052] Figure 5 is the flow chart of the use method of embodiment 2 of the present application.

[0053] BRIEF DESCRIPTION OF DRAWINGS

[0054] 1. scale;

[0055] 2. air-lock feeder;

[0056] 3. drying device; 31, feed pipe; 32, air outlet; 33, cylinder; 331, manhole; 332, support; 34, dispersion cone; 341, cone shell; 342, cutter; 35, necking; 36, combustion nozzle; 37, air inlet; 38, slag discharge hopper; 381, slag discharge door; 382, ash valve;

[0057] 4. elevator;

[0058] 5. dust collector; 51, grating wheel; 52, chain conveyor;

[0059] 6. exhaust fan; 61, second air inlet valve;

[0060] 7. circulating air valve;

[0061] 8. first air inlet valve. DETAILED DESCRIPTION

[0062] The present application installs the dispersion cone 34 in the center of the vertical cylinder 33, and a plurality of fixed cutting knives 342 are installed on the dispersion cone 34. The block material is cut by the cutting knives 342 by its own gravity, and then leaks down. When passing through the neck 35, the materials collide with each other and are crushed again. The high-temperature gas flows from bottom to top through the vertical cylinder 33, and the heat exchange process is completed in the cylinder 33. The powder rises with the gas flow, and the finished product is collected.

[0063] The material generally includes block and powder. In this article, the block material refers to the block material, and the powder material refers to the powder material.

[0064] (1) The material of the present application enters and exits vertically, which is different from the rotary dryer, and can avoid the material from being formed into balls and blocks in the rolling progress. The dispersion effect of the present application is good, the surface area of the material is increased, the heat exchange area is large, and the heat exchange efficiency is improved. Therefore, the fuel consumption can be reduced.

[0065] (2) Compared with the drying hammer crusher, in the present application, a part of the material is taken away by the rising gas flow after being dried to become powder and escapes from the drying device 3. That is, after the feeding operation is performed, the powder mixed in the material is blown away and directly enters the finished product collection stage without falling down. This is equivalent to early diversion, which reduces the system installed power, thereby saving electricity.

[0066] (3) In addition, in the prior art, the separator and grinding disc of the vertical mill, or the rotor of the drying hammer crusher are rotating and rotating at high speed in production. The present application is different from the prior art. The dispersion cone 34 and the cutting knife 342 of the present application are fixed.

[0067] In summary, because the above technical means are adopted, compared with the prior art, the drying device provided by the present application belongs to a new device. In the embodiments of the present application, a plurality of optional implementation manners are provided, which can be selected according to actual needs. Regardless of which way is adopted, the drying of the material is no longer realized by using the prior art, and the problems in the prior art can be solved, and the corresponding effects can be achieved.

[0068] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0069] It should be noted that the terms "first", "second" and the like in the description and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence, and it should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented; it should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0070] The following several embodiments can be applied to the drying of carbide slag filter cake, and can also be applied to the drying method and equipment of other industries, such as treating sludge, desulfurization gypsum, etc., and can also be applied to the method and equipment that will appear in the future.

[0071] The embodiments of the application are described in detail below in conjunction with the drawings, but the application can be implemented in many different ways limited and covered by the claims.

[0072] Embodiment 1:

[0073] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the embodiment provides a drying device, comprising:

[0074] The drying device 3 is provided with a scale 1, the scale 1 is connected with a feeding pipe 31 located at the upper part of the drying device 3 through a lock air feeder 2, and the scale 1 can select a speed-regulating belt scale;

[0075] A vertical cylinder 33 is rolled and welded by steel plates; the cylinder 33 is subjected to heat preservation treatment, and the heat preservation mode is to build fire bricks and / or castable;

[0076] The top end of the cylinder 33 is connected with an air outlet 32; the feeding pipe 31 penetrates the air outlet 32 and is coaxially arranged with the cylinder 33;

[0077] At least one fixed dispersion cone 34 is installed below the discharge port of the feeding pipe 31 inside the cylinder 33, a cutter 342 is installed on the cone shell 341 of the dispersion cone 34, and holes are distributed on the cone shell 341;

[0078] At least one necking 35 is arranged inside the cylinder 33, the cross-sectional area of the cylinder 33 at the necking 35 is smaller, and the flow rate is accelerated when the airflow passes through the necking 35;

[0079] The lower part of the cylinder 33 is connected with an air inlet 37; and a slag discharge hopper 38 is used to store slag (block material, metal, etc.).

[0080] Referring to Figure 1 , Figure 2 ,Figure 3 and Figure 4 The conical shell 341 is connected with the peripheral wall of the cylinder 33 through a support 343, the end of the support 343 penetrates through the peripheral wall of the cylinder 33 and is welded with the peripheral wall, and the dispersion cone 34 is supported on the support 343. This structure is simple and reliable.

[0081] Referring to Figure 1 A support 332 is arranged on the peripheral wall of the cylinder 33, which is a ring-shaped support 332 or an ear-shaped support 332, and the drying device 3 is supported by the support 332 in the workshop, which is simple and reliable in structure.

[0082] Referring to Figure 1 An access door 331 is arranged on the peripheral wall of the cylinder 33, which is convenient for personnel to enter for maintenance.

[0083] Referring to Figure 1 , Figure 2 and Figure 3 The cutter 342 is in a radial shape from the center to the outside in a plan view, and the cutter 342 is deflected by 0-30 degrees along the radial direction; the top center of the conical shell 341 has a hole, and the conical shell 341 between adjacent cutters 342 also has holes; therefore, when the airflow passes through the dispersion cone 34, a cyclone can be generated, which prolongs the residence time of the material in the drying device 3 and is beneficial to the heat exchange between the gas and the solid.

[0084] Referring to Figure 1 A hoist 4 is additionally arranged, the feeding port of the hoist 4 is connected with the end of the slag discharge hopper 38, and the discharging port of the hoist 4 is connected with the feeding pipe 31. The hoist 4 is a mechanical conveying device, which is mainly suitable for the continuous vertical lifting of powdery, granular and small block materials; the traction members of the bucket hoist 4 include ring chains, plate chains and rubber belts; the structure of the ring chain is relatively simple, the connection with the hopper is very firm, the wear of the chain is small when conveying materials with high abrasiveness, but the self-weight is large; the structure of the plate chain is relatively firm and the self-weight is light, which is suitable for the hoist 4 with large lifting capacity, but the hinged joint is easy to be worn; the structure of the rubber belt is relatively simple, but it is not suitable for conveying materials with high abrasiveness; the temperature of the general rubber belt material does not exceed 60℃, the temperature of the steel wire clamped rubber belt material is up to 80℃, the temperature of the heat-resistant rubber belt material is up to 120℃, and the temperature of the ring chain and the plate chain conveying materials can reach 250℃; the hoist 4 in the embodiment is selected from a ring chain bucket hoist 4 or a plate chain bucket hoist 4; the application of the hoist 4 is beneficial to the rapid entry of the circulating material into the system.

[0085] Referring to Figure 1, the bottom of the residue hopper 38 is provided with a residue discharge door 381, after long time operation of the system, feeding can be stopped, the first air inlet valve 8 is closed, the elevator 4 keeps running, the residue discharge door 381 is opened, and the metal and other sundries are conveniently removed.

[0086] Referring to Figure 1 , the end of the residue hopper 38 is provided with a dust discharging valve 382, the dust discharging valve 382 is rotary or flap type, the dust discharging valve 382 is uniform in discharging, and is beneficial to stable operation of the system.

[0087] Embodiment 2:

[0088] The embodiment provides a system containing a drying device and a use method thereof, Figure 5 is a flow chart of the use method according to the embodiment of the application, and the method comprises the following steps:

[0089] Referring to Figure 1 and Figure 5 , step S1, metering and air locking feeding, feeding the material into the drying device 3;

[0090] After the material is metered by the scale 1, the air locking feeder 2 is used to perform the feeding operation, and the material (carbide slag cake with water content of about 35%, new material) is fed from the top of the drying device 3; the metered cake falls freely;

[0091] In the embodiment, a hydraulic three-way valve is selected, the three-way valve is composed of three air locking valve plates and wear-resistant lining plates, a hydraulic system (including a hydraulic cylinder, an oil pump and an electromagnetic valve) and an electric control system, the three air locking valve plates (a first valve plate, a second valve plate and a third valve plate) arranged from top to bottom are all controlled by the hydraulic cylinder, and the circulation of each hydraulic cylinder is controlled by the three electromagnetic valves. In operation, first, the electromagnetic valve of the first valve plate is powered, the electromagnetic valve of the second valve plate is not powered, and the electromagnetic valve of the third valve plate is just powered off, that is, the first valve plate performs the opening action, the second valve plate is fully closed, and the third valve plate performs the closing action; then, the electromagnetic valve of the second valve plate is powered to perform the opening action of the second valve plate, the electromagnetic valve of the third valve plate is not powered, the electromagnetic valve of the first valve plate is just powered off to perform the closing action of the first valve plate; after one cycle, the next cycle is started. In this way, in the working process of the three-way valve, one air locking valve is always in the closed state, thereby achieving strong air locking effect, and only one valve plate is in the open state to perform the feeding operation. In this way, accurate feeding and air locking (that is, preventing external cold air from being mixed) are realized.

[0092] Referring to Figure 1 and Figure 5 , step S2, dispersing the material by using the self-weight impact of the material; air flow contacts and exchanges heat with the material; preliminary classification and final heat exchange are completed under the assistance of the air flow;

[0093] The air inlet 37 of the drying device 3 is connected with a first air inlet valve 8, and hot air from outside is introduced through the air inlet 37, which is from a combustion furnace or high-temperature waste gas generated in industry. The air volume is adjusted through the first air inlet valve 8; the high-temperature gas flow flows from bottom to top through the vertical cylinder 33 which is heat-insulated to reduce heat loss;

[0094] Heat transfer is a ubiquitous transfer phenomenon in nature and engineering fields, and widely exists in chemical industry, power, energy, metallurgy and environmental protection fields; the heat exchange of cold and hot fluids in the heat transfer process can be divided into three types: direct contact heat exchange, heat storage heat exchange and partition heat exchange; the direct contact heat exchange refers to the heat transfer process of two or more fluids without solid partition, which is usually accompanied by mass transfer process, and the embodiment of the present application adopts direct contact heat exchange.

[0095] The cylinder 33 of the embodiment is thick at the top and thin at the bottom, and is provided with a dispersion cone 34 and a necking 35 inside; the dispersion cone 34 is made of heat-resistant stainless steel with a brand ZG40Cr25Ni20. A cutter 342 is installed on the cone shell 341 of the dispersion cone 34, and holes are distributed on the cone shell 341; the filter cake falling on the dispersion cone 34 is cut and scattered, and exchanges heat with the high-temperature gas flow, and part of the materials are dried, in which the powder rises with the gas flow;

[0096] Referring to Figure 1 and Figure 5 , in step S3, the block materials are separated by the "spouting" effect generated by the necking 35;

[0097] The remaining block materials continue to fall, and when passing through the necking 35, the "spouting" effect is generated by the necking 35, which refers to the suspension and movement of materials by the blowing of gas; when the gas flow passes through the necking 35, the flow rate increases due to the decrease of the cross section, and the materials will boil, in which the powder rises with the gas flow, the block materials slide along the upper edge wall of the necking 35 after losing speed, and collide with each other to be crushed again; finally, the materials still maintaining block state fall into the slag discharging hopper 38;

[0098] Referring to Figure 1 and Figure 5 , in step S4, the powder is taken out of the drying device 3 by the gas flow, and after passing through the dust removal device, the finished product collection is completed.

[0099] The air outlet 32 of the drying device 3 is connected with a dust removal device, and then connected with an exhaust fan 6, which is provided with a second air inlet valve 61 (manual or automatic) and / or a variable frequency motor for adjusting the gas flow of the system; that is, the dust removal device is arranged according to the emission requirement, and the dust removal device includes a settling chamber and / or a dust collector 5, which is a bag-type dust collector, an electric dust collector or a cyclone dust collector;

[0100] In the upper part of the cylinder 33, the qualified powder is collected by the dust collector 5 and / or the dust collector 5, and the purified exhaust gas is discharged. Among them:

[0101] The bag filter mainly uses filter material to filter the dust-containing gas, so that the dust is blocked on the filter material to achieve the purpose of dust removal. The filtering process is divided into two stages. First, the dust-containing gas passes through the clean filter material, at this time the main filtering effect is the fiber. Secondly, as the amount of dust blocked increases, part of the dust is embedded inside the filter material, and part of it covers the surface to form a dust layer. In this stage, the filtration of dust-containing gas is mainly dependent on the dust layer, at this time the dust layer plays a more important role than the filter material. The bag filter has the characteristics of high dust removal efficiency, especially for fine dust, but it is not suitable for strong hygroscopic dust. When using a bag filter 5 to treat exhaust gas, special attention should be paid to controlling the flue gas temperature, which should be 30-40℃ higher than the dew point temperature, and anti-condensation glass fiber bags should be used.

[0102] In the electric dust collector, the collection of dust is mainly based on the principle that the dust is separated from the airflow after being charged in the corona electric field and moving towards the heterogeneous electrode. The range of collected dust particles is large, and it still has high efficiency for dust as small as 0.1 μm, and it has good adaptability to humid gas. Its disadvantage is that it is sensitive to dust, and the most suitable range is specific resistance of 10 4 -5×10 10 Ω·cm.

[0103] By adjusting the size of the first air inlet valve 8 or the second air inlet valve 61, the outlet air speed of the drying device 3 can be adjusted, and the maximum particle size of the finished product can be controlled;

[0104] The dust removal device is equipped with a powder unloading device and / or a finished product conveyor. In this embodiment, the powder unloading device is a grid wheel 51, and the finished product conveyor is a chain conveyor 52. In this embodiment, the grid wheel 51 is used for finished product unloading, and the chain conveyor 52 is used for finished product conveying.

[0105] The grid wheel 51 is also called a steel impeller feeder, a steel impeller unloader or a star unloader. The product is driven by a motor through a speed reducer to rotate the rotor with blades in the housing. The material falls from the upper hopper to the blades, and is discharged to the lower end with the blades to achieve uniform and stable feeding of the material. The grid wheel 51 is a special equipment for unloading or feeding of powdery material, which can continuously and uniformly feed the dry powdery material or small particle material in the upper bin to the next equipment. It is a kind of quantitative feeding equipment, which can use a frequency converter or a slip motor to achieve stepless speed regulation to control the feeding amount. It is widely used in cement, building materials, chemical industry, metallurgy and light industry.

[0106] Chain conveyor 52, also known as a zipper machine, is a kind of conveying machine for horizontally conveying powdery, granular and small block materials. When the conveying chain and its accessories of the conveyor move, the bulk material in the trough of the conveyor is subjected to a pulling force in the same direction as the conveying movement direction, so that the internal pressure between the bulk material particles increases, thereby increasing the internal friction between the bulk material. When the internal friction is greater than the friction between the bulk material and the side wall of the trough, the bulk material will move forward along the direction of the conveying chain movement, and the increased internal pressure ensures the stable state between the bulk material layers, thereby forming a whole continuous flow.

[0107] Through the above steps, the wet material is dried; the present application provides a new drying method, which improves the efficiency; therefore, the prior art can no longer be used; on this basis, according to the different properties of the material, additionally, in this embodiment, a plurality of optional use modes are also provided, each of which can solve the problems in the prior art and achieve the corresponding effect:

[0108] (1) Use of circulating air

[0109] A system comprising a drying device and a method for using the same, optionally, a circulating air pipe is communicated between the exhaust port of the exhaust fan 6 and the air inlet 37 of the drying device 3, a circulating air valve 7 is additionally arranged on the circulating air pipe, the circulating air valve 7 is adjusted according to the moisture content of the exhaust gas, the moisture content of the exhaust gas is controlled, and the condensation in the dust collector 5 is used as a standard, and part of the exhaust gas is re-introduced into the system. The application of the circulating air pipe can maximize the use of its heat enthalpy, achieving the purpose of waste heat recovery.

[0110] (2) Use of combustion nozzle 36

[0111] A system comprising a drying device and a method for using the same, optionally, a combustion nozzle 36 is additionally arranged on the peripheral wall of the cylinder 33; when the moisture content of the material is too large, resulting in insufficient heat of the system, which is manifested as the low temperature of the air outlet 32 of the drying device 3, fuel such as coal powder, heavy oil or diesel oil is injected from the combustion nozzle 36, and the fuel can supplement heat after combustion; and / or, the feeding amount and the air temperature constitute a closed loop control; like making dough, if the dough is added with too much water, or the water is added with too much dough, the closed loop control improves the automation level.

[0112] (3) After experiencing the step S3, if the block material (slag) is small, it can be stored in the slag discharging hopper 38, which needs to be discharged (manually) periodically, the system does not set the elevator 4; or the elevator 4 is set, but the elevator 4 is not continuously operated; which can save investment or power consumption.

[0113] (4) After the step S3, if there are too many blocks (slag), a circulating elevator 4 can be added, and the blocks are lifted by the elevator 4 and then re-enter the drying device 3 together with new materials to be dried and crushed again; the automation level can be improved.

[0114] (5) Add an intermediate

[0115] A system containing a drying device and a method for using the same, further, in the drying device 3, a non-broken block material such as a steel ball, a steel forging, a ceramic ball or a pebble is added as a medium, and the medium is recycled.

[0116] In this embodiment, the pebble and the calcium carbide slag filter cake enter the drying device 3 at the same time, the calcium carbide slag filter cake is broken into powder after being dried and is carried out by the airflow and separated from the pebble naturally; the pebble is recycled, so its temperature is higher, and after mixing with new materials, it can strengthen heat transfer, for example, in folk, the heated pebble can maintain the temperature for a long time, and the high temperature can be used to fry dishes; in addition, the medium such as the pebble is not easy to break, and as an abrasive, it can reduce the particle size of the material after mixing, and similar to sandblasting, the medium such as the pebble can better eliminate the phenomenon of material sticking to the wall.

[0117] Finally, it should be noted that the above content is only used to illustrate the technical solutions of the present application, and is not a limitation on the protection scope of the present application, and the simple modification or equivalent replacement of the technical solutions of the present application by the ordinary skilled in the art does not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A drying apparatus equipped with a scale, the scale being connected to a feed pipe located at the upper portion of the drying apparatus through a lock air feeder, characterized in that, The device comprises a vertical cylinder, a dispersion cone, a cutter and a necking. The cylinder is heat-insulated, and an air outlet is connected to the top end of the cylinder. The end of the feeding pipe is coaxially arranged with the cylinder. At least one fixed dispersion cone is installed below the discharge port of the feeding pipe.

2. A drying apparatus as claimed in claim 1, wherein The cylinder is internally provided with at least one necking, and the cross-sectional area of the cylinder is reduced at the necking.

3. A drying apparatus as claimed in claim 1, wherein The lower part of the cylinder is connected with an air inlet, and the airflow flows through the inside of the cylinder to complete heat exchange with the material to realize drying of the material.

4. The drying apparatus of claim 1, wherein The lower part of the cylinder is connected with a slag discharge hopper.

5. The drying apparatus of claim 1, wherein The cone shell is connected with the peripheral wall of the cylinder through a support.

6. A drying apparatus as claimed in claim 5, wherein The peripheral wall of the cylinder is provided with a support, which is a ring support or an ear support.

7. A drying apparatus as claimed in any one of claims 1 to 6, wherein The peripheral wall of the cylinder is provided with a combustion nozzle.

8. A system comprising a drying apparatus, characterized in that The device further comprises an elevator, and the feeding port of the elevator is connected with the end of the slag discharge hopper.

9. A system containing drying means according to claim 8, characterized in that, The bottom of the slag discharge hopper is provided with a slag discharge door.

10. A method of using a system containing a drying device, such as claimed in claim 8 or 9, characterized in that, The end of the slag discharge hopper is provided with an ash discharge valve. The device comprises a drying device, a first air inlet valve, a second air inlet valve and a dust removal device. The air outlet of the exhaust fan is communicated with the air inlet of the drying device through a circulating air pipe, and a circulating air valve is arranged on the circulating air pipe. The device comprises the following steps: S1, after the material is weighed, the material is fed from the top of the drying device by using a lock air feeder; 11. A method of using a system containing a drying device according to claim 10, characterized in that, S2, the material is dispersed by using the self-impact of the material, the airflow contacts and exchanges heat with the material, and the material is preliminarily classified and finally exchanges heat under the assistance of the airflow, part of the material is dried, and the powder rises with the airflow; 12. The method of using a system containing a drying device of claim 10, wherein, S3, the remaining block material continues to fall, and when passing through the necking, the material is impacted and crushed again by using the "spouting" effect of the necking; after the block material is separated, the powder rises with the airflow; finally, the material still in block form falls into the slag discharge hopper; S4, the powder is taken out of the drying device by the airflow, enters the dust removal device, and completes the collection of finished products, and the purified waste gas is exhausted. The dust removal device comprises a settling chamber and / or a dust collector, and the dust collector is a bag-type dust collector or an electric dust collector or a cyclone dust collector. The feeding amount and the air temperature of the air outlet of the drying device constitute a closed-loop control.

13. The method of using a system containing a drying device of claim 10, wherein, When the material moisture is too large to cause insufficient heat of the system, fuel is injected from the combustion nozzle, and the fuel can supplement heat after combustion.

14. A method of using a system containing a drying device according to any one of claims 10, characterized in that, In the drying device, bulk material is incorporated as medium, and the medium is recycled; the medium is used to strengthen heat transfer, and / or grind the material, and / or eliminate the material sticking to the wall.

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