CN212339808U - Negative pressure steam rotary dryer - Google Patents

Abstract

The utility model provides a negative pressure steam rotary dryer, including barrel, drive arrangement and screening system, the one end of barrel is equipped with the feed inlet, and the other end is the discharge gate, and the discharge gate is located to the screening system, and the barrel is equipped with steam heat transfer device through the drive arrangement drive rotation of locating its outside in the barrel, the screening system is including the cover body and vibratory screen, and the discharge gate is located to the cover body, and vibratory screen locates the cover internally and be located the lower extreme of discharge gate, and the lower extreme of the cover body is equipped with the export of thin material, and the upper end is equipped with dust steam discharge port, and dust steam discharge port connects the negative pressure pipe, and the side. This scheme is effectual has improved drying effect and separation efficiency to the material glauber's salt, makes drying and separation go on in step, and effectual improvement is convenient for reduce the production cost of manufacture to equipment to glauber's salt production machining efficiency, is convenient for reduce the drying cost to the glauber's salt simultaneously.

Description

Negative pressure steam rotary dryer

Technical Field

The utility model relates to a drying equipment, especially a negative pressure steam rotary dryer.

Background

The steam rotary dryer is indirect heat exchange rotary drying equipment using steam as a heat source, and is suitable for drying wet powder materials in the industries of metallurgy, chemical industry, environmental protection, building materials and the like. Such as: fine copper powder, fine iron powder, fine nickel powder, coal powder, desulfurized gypsum, sulfite and the like. At present, a plurality of steam rotary dryers are used in China, one is a straight tube integral dryer, as described in EP0305706A2, namely a heat exchange tube adopts a straight tube penetrating through the whole barrel, and the heat exchange tube is welded and fixed on the barrel; the other type is an independent detachable dryer, as described in US6415527B1 and US2006/0242855A1, that is, a heat exchange tube is not fixedly connected with a cylinder body, and a heat exchange tube supporting structure is arranged in the cylinder body. Compared with the integral straight-tube steam rotary dryer, the independent detachable steam rotary dryer has the advantages of convenient overhaul and replacement of the heat exchange tubes, small abrasion of the heat exchange tubes, large heat exchange area in same proportion, high heat efficiency and the like. However, the existing independent detachable dryer has the following defects in operation:

1. when being dry material water content is higher, because of material mobility is poor, very easily lead to the material to pile up at the feed inlet, the wall bonding phenomenon appears in barrel inner wall, heat exchange tube outside, has not only hindered the heat exchange between material and the heat exchange tube, reduces heat exchange efficiency, when the material has corrosivity, still can accelerate the corruption of heat exchange tube and barrel inner wall in the wall bonding position, makes the life reduction of heat exchange tube and barrel.

2. Before the dried material enters the dryer from the upstream process, special equipment is needed to convey the material into the dryer from the outside of the dryer. Due to the selected reasons of the equipment form, the structure and the like, when the materials enter the dryer from the feeding hole, a large amount of overflow is easy to occur, the dust is serious, the field operation environment is poor, the human health is not good, and meanwhile, the field needs to be cleaned regularly, and a large amount of manpower and material resources are consumed.

3. When the abrasiveness of the dried material is strong, the welding part of the straight pipe and the ring pipe of the heat exchange pipe assembly of the dryer is seriously abraded, and the pipe wall can be thinned after long-time operation. When the pipe wall is thinned to the point that the pipe wall can not bear the operation pressure, a large amount of steam is leaked, the drying effect is reduced, and the service life of the heat exchange pipe assembly of the dryer is shortened.

4. The gap between the straight heat exchange pipe outside the discharging cover and the discharging sealing plate is large, dry materials are easy to leak, the field operation environment is poor, the field needs to be cleaned regularly, and a large amount of manpower and material resources are consumed.

5. The main steam distribution chamber is connected with the heat exchange tube straight pipe by adopting threaded connection, the sealing element is sealed by adopting a graphite gasket, the structural form has strict requirements on gasket replacement in the maintenance process, the condition that the sealing surface is positioned incorrectly is not easy to occur in the operation, the steam is easy to leak in the operation process of the equipment, the maintenance time is short, the maintenance workload is large, and the production is influenced.

Patent No. CN102393129A discloses an abrasion-resistant steam rotary dryer, treat the cylinder of dry material including being used for the holding, this cylinder has two tip of feed end and discharge end, and this feed end constructs for being used for accepting and treating dry material, and this discharge end constructs for being used for discharging dry material, the feed end is equipped with the feeding end plate, the discharge end is equipped with ejection of compact closing plate and ejection of compact cover, is equipped with a plurality of heat exchange tube assemblies that rotate together along with it in the cylinder, and the internal surface of the shell of cylinder is covered by the abrasion-resistant welt rather than the laminating. The abrasion-resistant lining plate is arranged on the inner surface of the roller, so that the abrasion resistance of the roller is improved, the manufacturing cost of the roller is reduced, and the maintenance efficiency is improved. But the device need assemble screening separation system in addition at the use, and the process is loaded down with trivial details in the use, makes steam condense at the barrel inner wall easily simultaneously, influences the drying effect of material mirabilite.

Disclosure of Invention

The utility model aims at overcoming the above-mentioned not enough of prior art, and provide a simple structure, be convenient for improve drying efficiency, reduce the water vapor and condense, improve the negative pressure steam rotary drier of material drying effect and efficiency.

The technical scheme of the utility model is that: the utility model provides a negative pressure steam rotary dryer, includes barrel, drive arrangement and screening system, and the one end of barrel is equipped with the feed inlet, and the other end is the discharge gate, and the discharge gate is located to the screening system, and the barrel is equipped with steam heat transfer device through the drive arrangement drive rotation of locating its outside in the barrel, the screening system includes the cover body and vibratory screen, and the discharge gate is located to the cover body, and vibratory screen locates the cover internally and be located the lower extreme of discharge gate, and the lower extreme of the cover body is equipped with the thin material export, and the upper end is equipped with dust steam discharge port, and negative pressure pipe is connected to dust steam discharge.

The advantage of this scheme lies in, with drying and screening an organic whole setting, the effectual cost of manufacture that reduces equipment is convenient for simultaneously to the timely screening separation of material after the drying, is convenient for reduce condensing of steam, the promotion of the drying effect of being convenient for, whole drying and screening in-process all adopt the negative pressure, the collection of steam and dust of being convenient for prevents the polluted environment, the effectual processing production efficiency who improves the material.

Further, the cover body is connected with the cylinder body in a sealing mode through a hose. The vibration that is convenient for reduce screening system production influences the structural strength and the rotation of barrel, prevents to take place the friction damage.

Further, the negative pressure pipe is connected with a centrifugal fan, and a dehumidifier and a dust collector are further arranged on the negative pressure pipe. Dust and vapor in the cylinder body and in the screening system are extracted through the centrifugal fan, and the phenomenon that the vapor is condensed to block the negative pressure pipe and influence the collection of the dust is avoided.

Further, a vibrator is arranged at the lower end of the cover body. The vibrator is used for driving the vibration of the screen, so that the screening and separating effects are improved, and meanwhile, the vibration friction damage to the equipment is reduced.

Further, the vibrating screen is inclined downwards from the discharge hole to the coarse material outlet. The flow and the screening separation of the material of being convenient for, the discharge efficiency of the coarse fodder of being convenient for simultaneously avoids the coarse fodder to pile up in the screen cloth upper end, influences the effect of screening separation.

Furthermore, the driving device comprises a tug device and a transmission device, the tug device is connected with the barrel through a large gear, and the transmission device is used for driving a driving wheel on the tug device to rotate. In the use process, the driving wheel is driven by the transmission device to rotate on the tug device and is connected with the large gear wheel on the barrel, so that the barrel is driven to rotate, the material in the barrel is convenient to turn, the material can be in sufficient contact with the heat exchange device arranged in the barrel, the material is convenient to turn and flow, and the drying effect on the material is improved.

Further, steam heat transfer device is responsible for and is followed the ring branch pipe that the inside circumference of barrel distributes including the steam that sets up along barrel length direction, and the person in charge includes intake pipe and outlet duct, and the one end and the intake-tube connection of ring branch pipe, its other end and outlet duct connection.

Furthermore, the annular branch pipe is a wavy annular branch pipe, and the steam pressure is 0.05-3 MPa.

Preferably, the steam pressure is 1-3 MPa; more preferably, the steam pressure is 2.8 MPa; when the steam pressure is too low, the temperature of the heat exchange device is too low, the drying time is too long, the drying efficiency is influenced, and when the steam pressure is too high, the manufacturing requirement on the heat exchange device is too high, so that the manufacturing cost is greatly improved, and the cost is not saved; adopt the temperature in this steam pressure can guarantee the annular branch pipe to promote dry effect, adopt the wave form pipeline in addition, the promotion of the material of being convenient for and wave annular branch pipe area of contact, further promotion dry heat transfer's efficiency.

Further, the feed inlet is also provided with an air preheater. When the material got into the barrel, let in hot-air, made the material mix with hot-air, preheated the material in advance, the promotion of the drying efficiency of being convenient for can promote the mobility of material simultaneously, avoids the material to bond at the barrel inner wall, influences the dry effect of heat transfer, reduces the risk of jam.

Further, the air preheating temperature is 100-.

Preferably, the air preheating temperature is 110-.

Preferably, the air preheating temperature is 145 ℃, so that energy conservation is facilitated, meanwhile, the preheating effect of the materials is facilitated, and the materials can keep good fluidity.

The utility model has the characteristics of as follows: the utility model discloses effectual improvement to the drying effect and the separation efficiency of material glauber's salt, make dry and separation go on in step, effectual improvement to glauber's salt production machining efficiency, be convenient for reduce the production cost of making to equipment, be convenient for simultaneously reduce the drying cost to the glauber's salt.

The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is another schematic structural diagram of the present invention;

FIG. 3 is a schematic view of the dust removal system;

FIG. 4 is a schematic view of a heat exchange apparatus;

1-a feed inlet, 2-a negative pressure pipe, 3-a cover body, 4-a vibrating screen, 5-a coarse material outlet, 6-a fine material outlet, 7-a driving wheel, 8-a tug device, 9-a large gear, 10-a transmission device, 11-an air preheater, 12-a mixing chamber, 13-a barrel, 14-a dehumidifier, 15-a dust collector, 16-a centrifugal fan, 17-an annular branch pipe, 18-an air inlet pipe and 19-an air outlet pipe.

Detailed Description

As shown in the attached drawings: a negative pressure steam rotary dryer comprises a cylinder body 13, a driving device and a screening system, wherein one end of the cylinder body 13 is provided with a feed inlet 1, the other end of the cylinder body is a discharge outlet, the screening system is arranged at the discharge outlet, the cylinder body 13 is driven to rotate by the driving device arranged at the outer side of the cylinder body 13, a steam heat exchange device is arranged in the cylinder body 13, the screening system comprises a cover body 3 and a vibrating screen 4, the cover body 3 is arranged at the discharge outlet, the vibrating screen 4 is arranged in the cover body 3 and is positioned at the lower end of the discharge outlet, the lower end of the cover body 3 is provided with a fine material outlet 6, the upper end of the cover body is; the negative pressure pipe 2 is connected with a centrifugal fan 16, and a dehumidifier 14 and a dust collector 15 are also arranged on the negative pressure pipe 2; the dust and the water vapor in the cylinder 13 and in the screening system are extracted by the centrifugal fan 16, so that the water vapor is prevented from being condensed to block the negative pressure pipe 2 and influence the collection of the dust.

The cover body 3 is hermetically connected with the cylinder body 13 through a hose; the structural strength and the rotation of the cylinder 13 are influenced by the vibration generated by the screening system, and the friction damage is prevented. The lower end of the cover body 3 is provided with a vibrator; the vibrator is used for driving the vibration of the screen, so that the screening and separating effects are improved, and meanwhile, the vibration friction damage to the equipment is reduced.

The vibrating screen 4 is inclined downwards from the discharge hole to the coarse material outlet 5; the flow and the screening separation of the material of being convenient for, the discharge efficiency of the coarse fodder of being convenient for simultaneously avoids the coarse fodder to pile up in the screen cloth upper end, influences the effect of screening separation.

The driving device comprises a tug device 8 and a transmission device 10, the transmission device 10 is driven by a driving motor, the tug device 8 is connected with the cylinder 13 through a large gear 9, and the transmission device 10 is used for driving a driving wheel 7 on the tug device 8 to rotate; in the use process, the transmission device 10 drives the driving wheel 7 on the tug device 8 to rotate, the driving wheel 7 is in gear connection with the large gear 9 on the cylinder 13, so that the cylinder 13 is driven to rotate, the material in the cylinder 13 is convenient to turn, the material can be in full contact with the heat exchange device arranged in the cylinder 13, the material is convenient to turn and flow, and the drying effect on the material is improved.

The steam heat exchange device comprises a main steam pipe arranged along the length direction of the barrel 13 and annular branch pipes 17 distributed along the circumference of the inner wall of the barrel 13, the main steam pipe and the annular branch pipes 17 are arranged on the inner wall of the barrel 13 through fixed supports, the distance between each main steam pipe and the inner wall of the barrel 13 is 3-15cm, the circulation of materials is facilitated, meanwhile, the main steam pipes and the annular branch pipes are convenient to contact with the materials, and according to the processing requirement, the steam heat exchange devices can be arranged in multiple groups in a concentric circle with the barrel 13, so that the contact area and the drying effect between the; the main pipe includes an inlet pipe 18 and an outlet pipe 19, one end of the annular branch pipe 17 is connected to the inlet pipe 18, and the other end thereof is connected to the outlet pipe 19. In the use process, the air inlet pipe 18 is hermetically connected with a steam source, and the air outlet pipe 19 is introduced into the cooling water pool, so that the waste heat is convenient to collect, and the energy loss is reduced.

The annular branch pipe 17 adopts a wave-shaped annular branch pipe 17, and the steam pressure is 0.05-3 MPa. Preferably, the steam pressure is 1-3 MPa; more preferably, the steam pressure is 2.8 MPa; when the steam pressure is too low, the temperature of the heat exchange device is too low, the drying time is too long, the drying efficiency is influenced, and when the steam pressure is too high, the manufacturing requirement on the heat exchange device is too high, so that the manufacturing cost is greatly improved, and the cost is not saved; adopt the temperature in this steam pressure can guarantee annular branch 17 to promote dry effect, adopt the wave form pipeline in addition, the promotion of the material of being convenient for and wave annular branch 17 area of contact, further promotion dry heat transfer's efficiency. The annular branch pipe 17 can be a copper pipe, so that heat can be conveniently transferred between the annular branch pipe 17 and the material, and the drying effect can be conveniently improved.

In another embodiment, the feed port 1 is further provided with an air preheater 11. When the material gets into in the barrel 13, let in hot-air, make material and hot-air carry out intensive mixing in mixing chamber 12, preheat the material in advance, the promotion of the drying efficiency of being convenient for can promote the mobility of material simultaneously, avoids the material to bond at barrel 13 inner wall, influences the dry effect of heat transfer, reduces the risk of jam. Preferably, in order to improve the uniform mixing of the hot air and the material in the mixing chamber 12, the air intake of the hot air is arranged below the moving direction of the material, or a cyclone type entering mode can be adopted, so that the hot air and the material can enter the barrel 13 in a rotating manner, the material can be preheated uniformly, and meanwhile, the fluidity of the material is improved. The air preheating temperature is 100-150 ℃. Preferably, the air preheating temperature is 110-. Preferably, the air preheating temperature is 145 ℃, so that energy conservation is facilitated, meanwhile, the preheating effect of the materials is facilitated, and the materials can keep good fluidity.

In the using process, materials enter from the feeding port 1, according to the setting and processing requirements of equipment, the materials are uniformly mixed with hot air in the mixing chamber 12 after entering from the feeding port 1, the materials are preheated in advance, the barrel 13 rotates under the driving of the driving device, the materials flow to the inside of the barrel 13 and move towards the discharging port, and the materials are fully contacted with the heat exchange device in the moving process, so that the temperature of the materials is improved, the moisture evaporation achieves the drying effect, the moisture vapor is prevented from being condensed through the dehumidification of the fan and the collection of dust, the materials are screened and separated through the vibrating screen after being discharged, the materials achieve the packaging standard, and the cooling effect can be achieved; the screened fine material is directly used for packaging, and the screened coarse material can be collected for further treatment.

This scheme sets up drying and screening an organic whole, the effectual cost of manufacture that reduces equipment, is convenient for simultaneously to the timely screening separation of material after the drying, is convenient for reduce condensing of steam, the promotion of the drying effect of being convenient for, whole drying all adopts the negative pressure with screening in-process, the collection of steam and dust of being convenient for prevents the polluted environment, the effectual processing production efficiency who improves the material.

The above description is the preferred embodiment of the present invention and the technical principle applied by the preferred embodiment, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes based on the equivalent transformation, simple replacement, etc. of the technical solution of the present invention all belong to the protection scope of the present invention.

Claims (10)

1. The utility model provides a negative pressure steam rotary dryer, includes barrel, drive arrangement and screening system, and the one end of barrel is equipped with the feed inlet, and the other end is the discharge gate, and the discharge gate is located to the screening system, and the barrel is equipped with steam heat transfer device, its characterized in that through the drive arrangement drive rotation of locating its outside in the barrel: the screening system comprises a cover body and a vibrating screen, the cover body is arranged at the discharge port, the vibrating screen is arranged at the lower end of the discharge port in the cover body, a fine material outlet is formed in the lower end of the cover body, a dust steam outlet is formed in the upper end of the cover body, the dust steam outlet is connected with a negative pressure pipe, and a coarse material outlet is formed in the side surface of the cover body.

2. The negative pressure steam rotary dryer of claim 1, wherein: the cover body is connected with the cylinder body in a sealing mode through a hose.

3. The negative pressure steam rotary dryer of claim 2, wherein: the negative pressure pipe is connected with the centrifugal fan, and a dehumidifier and a dust collector are further arranged on the negative pressure pipe.

4. The negative pressure steam rotary dryer of claim 2, wherein: the lower end of the cover body is provided with a vibrator.

5. The negative pressure steam rotary dryer of claim 1, wherein: the vibrating screen is downwards inclined from the discharge hole to the coarse material outlet.

6. The negative pressure steam rotary dryer of claim 1, wherein: the driving device comprises a tug device and a transmission device, the tug device is connected with the barrel through a large gear, and the transmission device is used for driving a driving wheel on the tug device to rotate.

7. The negative pressure steam rotary dryer of claim 1, wherein: the steam heat exchange device comprises a steam main pipe arranged along the length direction of the barrel and an annular branch pipe distributed along the circumference inside the barrel, the main pipe comprises an air inlet pipe and an air outlet pipe, one end of the annular branch pipe is connected with the air inlet pipe, and the other end of the annular branch pipe is connected with the air outlet pipe.

8. The negative pressure steam rotary dryer of claim 7, wherein: the annular branch pipe adopts a wave-shaped annular branch pipe, and the steam pressure is 0.05-3 MPa.

9. The negative pressure steam rotary dryer of any one of claims 1-8, wherein: the feed inlet is also provided with an air preheater.

10. The negative pressure steam rotary dryer of claim 9, wherein: the air preheating temperature is 100-150 ℃.

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