CN212133053U

CN212133053U - Drying equipment of pulsating moving bed

Info

Publication number: CN212133053U
Application number: CN202020699646.4U
Authority: CN
Inventors: 李胜; 苏伟光
Original assignee: Shandong Dexi Environmental Technology Co ltd
Current assignee: Shandong Dexi Environmental Technology Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-12-11
Anticipated expiration: 2030-04-29

Abstract

The utility model belongs to the field of drying devices; in particular to a pulsating moving bed drying device, comprising: the device comprises a shell, a pulsation drying unit, a moving bed drying unit and a material cooler; the casing is vertical structure, and it includes: the chamber is arranged at the feeding part and the air outlet at the upper end of the shell and is arranged at the top end of the shell; the pulsating moving bed drying unit comprises a pulsating drying unit and a moving bed drying unit which are arranged in the shell, the pulsating drying unit is positioned below the feeding part, and the moving bed drying unit is positioned below the pulsating drying unit; a pulse gas distribution device is arranged between the pulse drying unit and the moving bed drying unit and below the moving bed drying unit; the material cooler is connected with the discharge hopper, and an air distribution cone is arranged between the upper part of the moving bed drying unit and the lower part of the pulsating air distribution device. The equipment realizes high-efficiency and rapid dehumidification of wet materials in a constant-speed drying stage and low-energy-consumption deep dehumidification in a speed-reducing drying stage, and effectively reduces the energy consumption of products in a production unit.

Description

Drying equipment of pulsating moving bed

Technical Field

The utility model belongs to the field of drying devices; in particular to a pulsating moving bed drying device.

Background

The information disclosed in the background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information constitutes prior art that is already known to a person of ordinary skill in the art.

In industrial production, moisture content of various high-moisture materials needs to be reduced to a low moisture content. The conventional equipment and method for drying high-humidity materials adopts the following steps: the high-temperature hot flue gas is used as a heat source to directly heat materials (such as air, nitrogen, flue gas and the like) and is used as a drying medium or carrier, an open-circuit system is adopted, a large amount of waste gas containing high-humidity steam is generated, the load of a treatment system is large, the energy consumption is high, and the materials with low ignition point (such as lignite) are easy to ignite and burn, so that potential safety hazards exist. Or the hot steam is used as a heat source to indirectly heat the materials, a closed circulation system is adopted, the heat value of the steam is high, and the process is safe and reliable.

The currently commonly used closed cycle dehydration systems include: fluidized bed drying, cross-flow bed drying, and the like. However, the present invention finds: the fluidized bed needs to keep the material to be dried in a fluidized state, and needs a large amount of fluidizing gas to be consumed; the flow-through bed moves oppositely to the fluidized medium by means of gravity, the bed layer has high resistance, the whole moving bed needs high fluidized medium flow, the power consumption is large, and the movement form is single. And the drying process of most wet materials is divided into: a constant speed drying stage and a deceleration drying stage. The drying efficiency of the wet material is higher by adopting an internal heating fluidized bed in the constant-speed drying stage; however, the movement state of the wet material has little influence on the dehydration rate by the deceleration drying stage, and the energy consumption is higher under the 'fluidization' state. The pulsation technology can effectively reduce air consumption, increase material turbulence and improve heat exchange efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model discloses from security, economic nature and the high efficiency angle comprehensive consideration of drying method, the drying characteristic law to wet material has designed a pulsation moving bed drying equipment, realizes that wet material is at the high-efficient quick dehumidification of constant speed drying stage and the low energy consumption degree of depth dehumidification in the deceleration drying stage, has effectively reduced the energy consumption of production unit product. In order to achieve the above purpose, the utility model discloses a following technical scheme.

A pulsating moving bed drying device comprises a shell, a pulsating drying unit, a moving bed drying unit and a material cooler. The shell is of a vertical structure and comprises a cavity, a feeding part arranged at the upper end of the shell, an air outlet and a discharge hopper arranged at the lower end of the shell. The pulsating moving bed drying equipment comprises a pulsating drying unit and a moving bed drying unit, and the material cooler is connected with the discharge hopper. The pulsation drying unit is arranged below a feeding part in the shell, the moving bed drying unit is arranged below the pulsation drying unit, the pulsation drying unit and the moving bed drying unit can be one group or multiple groups, multiple groups of pulsation beds are vertically arranged, pulsation air distribution devices with air distribution ports facing the feeding part are arranged between the pulsation drying unit and the moving bed drying unit and below the moving bed drying unit, and air distribution cones are arranged between the moving bed drying unit and the pulsation air distribution devices.

In some embodiments of the present invention, the feeding portion comprises a rotary feeding valve, a rotary distributor and a motor-reducer system, the rotary feeding valve is fixedly installed on the top surface of the housing, the rotary distributor is located in the housing and installed on the rotary feeding valve, and the motor-reducer system is in mechanical transmission connection with the rotary feeding valve and the rotary distributor.

The utility model discloses an in some embodiments, be provided with steam escape outlet on the rotatory feed valve, it is connected with the dust remover, and the steam of escape gets into the dust remover, causes the bonding bridge after avoiding escaping steam to leak the interior condensation of raw materials storage storehouse.

The utility model discloses an in some embodiments, the pulse drying unit includes pulse dryer, gas distribution device, pulsating rotary valve, the pulsating rotary valve is installed and is constituted pulse gas distribution device jointly on pulse dryer and the import of moving bed gas distribution device between the drying unit, and pulse drying unit's below and moving bed drying unit below all are provided with pulse gas distribution device.

Preferably, the pulse dryer is a vertical plate heat exchanger, and the heat exchanger is helpful for ensuring that the longitudinal mixing of the pulse bed layer is relatively independent, so that the powder in the region is fully mixed, and the working condition of good heat and mass transfer is maintained. The pulse drying unit can be one group or a plurality of groups, and a plurality of groups of pulse beds are vertically arranged.

In some embodiments of the present invention, the air distribution device includes a plurality of air distribution pipes arranged at intervals, and each air distribution pipe includes: the air distribution main pipe and the air cap are arranged on the air distribution main pipe and communicated with each other.

The utility model discloses an in some embodiments, remove bed drying unit is horizontal tubular, U type tubular, coil pipe formula or plate heat exchanger, and its lower part is calandria gas distribution pipe, and heat exchanger and gas distribution pipe constitute a removal bed drying unit group, removes the bed according to drying process needs and can include that one or more unit groups arrange perpendicularly, when guaranteeing that the mixture on bed is abundant, maintains the good operating mode of heat and mass transfer.

The utility model discloses an in some embodiments, sealed tripper is installed to the lower port that goes out the hopper to in discharging the material after the drying, guarantee pulse moving bed drying equipment's gas tightness simultaneously.

Compared with the prior art, the utility model discloses following several aspects's beneficial effect has been obtained:

(1) the pulsating unit realizes efficient and rapid dehumidification of wet materials in a constant-speed drying stage, and compared with the mobile flow-through drying unit, the pulsating unit has the advantages that the energy consumption in a speed-reducing drying stage is low, deep dehumidification can be realized, and the energy consumption of products in production units is reduced.

(2) Compared with a fluidized bed, the utility model discloses utilize gravity to accomplish the material and pass and flow, the pulsating gas flow air consumption is low, need not the fluidized medium of high flow, and consumption of power is low, and powder dispersion misce bene.

(3) Compared with conventional paddle drying and steam rotary drying, the system is simple, safe and reliable, the device integration level is high, the occupied area is small, the investment is low, and the operating cost is low.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic structural diagram of a pulsed moving bed drying apparatus and its auxiliary system in an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a pulsed moving bed drying device in an embodiment of the present invention.

Fig. 3 is a schematic structural view of an air distribution device in an embodiment of the present invention.

Fig. 4 is a schematic structural view of the wind distribution cone in the embodiment of the present invention.

The designations in the above figures represent respectively: 1-pulsating moving bed drying equipment, 2-dust remover, 3-induced draft fan, 4-waste heat recovery device, 5-steam reheater, 6-material cooler, 7-pulsating drying unit, 8-moving bed drying unit, 9-air distribution cone and 10-discharger; 101-shell, 102-feeding part, 103-gas outlet, 104-discharging hopper, 105-rotary feeding valve, 106-rotary distributor, 107-motor-speed reducer system, 108-escape outlet, 701-pulse drier, 702-gas distribution device, 703-pulse rotary valve, 704-gas distribution main pipe and 705-blast cap.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As mentioned above, the drying process of the wet material reaches the deceleration drying stage, since the drying rate mainly depends on the migration rate of moisture in the material, if the fluidized bed is heated internally, the dehydration rate is not greatly affected by the motion state of the wet material, and the material to be dried, such as brown coal, is maintained under the "fluidized" state by higher energy consumption, which causes the problem of higher energy consumption per unit product. Therefore, the utility model provides a pulsating movement bed drying equipment, it is right now to combine description drawing and detailed description to describe the utility model discloses further.

Referring to fig. 1 and 2, a pulsed moving bed drying apparatus comprises: the material enters the shell 101 through the feeding part 102 for drying, then is discharged through the discharging hopper 104, and then enters the material cooler 6 for cooling to form dry material.

The equipment still includes the auxiliary system of the further processing such as the moisture that the pulsation moving bed drying equipment deviate from the material when necessary, refer to fig. 1, including dust remover 2, draught fan 3, waste heat recovery device 4, steam reheater 5, the steam that the moisture that deviates from in the wet material formed is divided into two the tunnel after passing through dust remover 2, draught fan 3 in proper order with the dust, gets into waste heat recovery device 4 all the way and carries out waste heat recovery after, the condensation separates out the moisture that deviates from in the wet material and becomes dry low temperature noncondensable evacuation. And the other path enters the pulsating rotary valve 703 to become pulsating steam after being heated by the steam heater, and then the next drying cycle is started after the gas is distributed by the gas distribution device 702.

Further, in order to achieve the above-mentioned object, the pulsating moving bed drying apparatus 1 is a vertical structure fixed on the ground, and includes a housing 101 having a chamber, a feeding portion 102, an air outlet 103, and an outlet hopper 104, a pulsating drying unit 7, and a moving bed drying unit 8. Wherein, the shell 101 has a planar top surface and a conical bottom surface, and the feeding part 102 and the gas outlet 103 are both arranged on the top surface of the shell 101 and are communicated with the chamber of the shell 101, so as to feed the material into the pulsed moving bed drying equipment 1 for drying, and simultaneously discharge the removed steam. It should be understood that the pulse drying units 7 may be in one or more groups, with multiple groups of pulse beds arranged vertically. The moving bed drying unit 8 can also be vertically arranged by one or more unit groups and a plurality of groups of moving beds according to the requirements of the drying process.

Continuing to refer to fig. 2, go out hopper 104 and set up on the toper bottom surface of casing 101, and be provided with tripper 10 in the play hopper 104, tripper 10 is connected with material cooler 6, and the material cools off in getting into material cooler 6 after the drying by tripper 10 discharge to realize the recovery of waste heat, in order to further utilize the waste heat of this part recovery, the utility model discloses a some embodiment uses it for the preheating of waiting to dry the material, and the material is dried in getting into casing 101 by feed portion 102 again after preheating. The material cooler 6 uses wet materials to be dried as a cold source, can exchange heat with hot materials to be dried from the discharge hopper 104, and can preheat the materials before drying after recovering the energy of the hot materials.

For the feeding part 102, it includes the rotary feeding valve 105, the rotary distributing device 106 and the motor-reducer system 107, the rotary feeding valve 105 is fixedly installed on the top surface of the casing 101, the rotary distributing device 106 is located in the casing 101 and installed on the rotary feeding valve 105, and the motor-reducer system 107 is in mechanical transmission connection with both the rotary feeding valve 105 and the rotary distributing device 106, so as to realize the start, the close, the control rotation rate and the like of the rotary feeding valve 105 and the rotary distributing device 106. By providing the rotary distributor 106 below the rotary feed valve 105, it is ensured that the material is distributed evenly over the upper surface of the bed of the pulsating drying unit 7.

Referring to fig. 1, the gas outlet 103 mainly functions to discharge moisture removed from the wet material and entrained dust (hereinafter, simply referred to as "exhaust gas"). Therefore, gas outlet 103, dust remover 2, draught fan 3, waste heat recovery device 4 connect gradually, and the export of draught fan 3 divide into two the tunnel, all the way with waste heat recovery device 4 is connected, another way and steam reheater 5's access connection. One path of the dedusted exhaust gas enters the waste heat recovery device 4 to exchange heat with a cooling medium therein, so that waste heat recovery is realized; and the other path of the raw material enters the steam reheater 5 to be heated and then enters the shell 101 to form pulsating steam to pulsate the material, so that the power consumption can be reduced compared with the traditional fluidized bed technology, and the powder is uniformly dispersed and mixed.

With continued reference to fig. 2, for the pulse drying unit 7, which comprises a pulse dryer 701, an air distribution device 702, a pulse rotary valve 703, the pulse dryer 701 is disposed in the housing 101 below the feed section 102. The pulsating rotary valve 703 is installed at the inlet of the air distribution device 702 between the pulsating dryer 701 and the moving bed drying unit 8 to jointly form a pulsating air distribution device, and the outlet of the steam reheater 5 is connected with the pulsating rotary valve 703, so that the internal circulation of the steam is realized, and the steam is converted into pulsating steam to pulse the material.

With continued reference to fig. 2, the moving bed drying unit 8 is arranged below the pulse dryer 701, and an air distribution device 702 is arranged between the pulse dryer 701 and the moving bed drying unit 8 and below the moving bed drying unit 8, and an air distribution port of the air distribution device 702 faces the feeding portion 102, i.e., is shown as being upward in fig. 1.

It can be seen that the utility model discloses in the implementation the steam route of will pulsating moving bed drying equipment 1 designs into superheated steam closed cycle, not only can deviate from most moisture in the material, through the superheated steam at the system inner loop moreover, and exhaust tail gas is pure steam, can all retrieve the heat and deviate from moisture to running cost and energy consumption have effectively been reduced.

In addition, the intermediate material discharged from the pulsation drying unit 7 enters the moving bed drying unit 8 for deep dehydration, the drying at this time is a deceleration drying section, the moisture is controlled by internal diffusion and migration, the drying time is long, the dehydration amount is low, the temperature of the superheated steam can be adjusted by the reheater 5 by adopting the moving bed superheated steam closed circulation, the heat required by the deceleration drying section is provided, and the superheated steam circulation amount is low. Superheated steam generated by a part of dehydrated water and circulating superheated steam are subjected to dust removal and then condensed and discharged by the waste heat recovery device 4, and the other part of the superheated steam enters the reheater 5 to be recycled after the temperature is adjusted.

Further, referring to fig. 3, for the gas distribution device 702, in some implementations, it includes a plurality of gas distribution pipes arranged at intervals, each gas distribution pipe is composed of a gas distribution main pipe 704 and a hood 705, and the hood is installed on the gas distribution main pipe and is communicated with the gas distribution main pipe. The materials in the pulsating bed are pulsated by gas through the specially designed pulsating gas distribution device, so that the power consumption can be reduced compared with the traditional fluidized bed technology, and the dry materials are uniformly dispersed and mixed.

Further, the pulse dryer 701 is a vertical plate heat exchanger in some implementations, the heat exchanger helps to ensure that longitudinal mixing of a pulse bed layer is relatively independent, the pulse bed can fully mix powder in an area at a local high air speed, possible particle bonding and agglomeration are prevented, a heat transfer boundary layer between a material and the plate heat exchanger is fully damaged, the surface heat and mass transfer efficiency is greatly improved by 2-5 times, and a good working condition of heat and mass transfer is maintained.

Further, the moving bed drying unit 8, which is a horizontal tubular heat exchanger in some implementations, improves the material retention time while ensuring the thorough mixing of the bed layer, and the heat can be provided by the built-in tubular heat exchanger and the reheater at the same time, so that the moving bed greatly improves the surface heat and mass transfer efficiency by 2-10 times compared with the static material, and maintains the excellent working condition of heat and mass transfer.

In addition, a steam escape outlet 108 is arranged on the rotary feeding valve 105 and connected with the dust remover 2, and a special steam outlet is arranged on the rotary feeding valve 105 to ensure that steam in the shell 101 cannot be condensed to cause bonding bridging in the raw material storage bin when leaking to the raw material storage bin.

In addition, in order to realize the recycle of energy the utility model discloses an in some actual implementations, adopt board-like or tubular heat exchanger as waste heat recovery device 4, this heat exchanger uses the wet material of treating drying as the cold source, and it can carry out the heat transfer with the steam that comes from gas outlet 103, and the material that is the cold source after the heat transfer reenters feed portion 102 and carries out formal drying, is used for preheating before the material drying after retrieving energy through this kind of mode.

Similarly, a plate-type or tube-type heat exchanger is used as the material cooler 6, a refrigerant outlet (cold water is used as a refrigerant) of the material cooler 6 is connected with the preheater, the material preheater is connected with a heat exchange medium outlet of the material cooler 6, a heat medium enters the preheater to be used as a heat source, after the material is preheated, the material is formally dried by entering the feeding part 102, and the refrigerant can be recycled. It should be understood that, besides the wet material to be dried adopted in the foregoing embodiment as a cold source, the cold water described in this embodiment may also be a cold source/refrigerant, or low-temperature air may also be adopted as a cold source/refrigerant to achieve recycling of energy.

Further, referring to fig. 4, in some implementations, an air distribution cone 9 is disposed in the housing 101 between the upper side of the moving bed drying unit 8 and the lower side of the air distribution device 702, and the air distribution cone has an inverted "V" shape structure, which helps to break up the top discharged material and disperse the lower air flow.

Further, taking polycarbonate PC as a wet material to be dried, and performing a drying test on the wet material by adopting the pulsed moving bed drying equipment, wherein the treatment capacity is 5t/h, the moisture content of the wet material is 10%, and the bulk density of the material is as follows: 600Kg/m³. Tests show that the moisture content of wet materials is reduced to 2% from 10% after pulse drying of a vertical plate heat exchanger (a pulse dryer 701), the moisture content of dry materials obtained after drying of a horizontal tube heat exchanger (a moving bed drying unit 8) is only 0.03%, the requirements of drying indexes are completely met, and compared with a fluidization process technology adopting superheated steam for direct heating, the total superheated steam circulation required by pulse fluidization can be reduced by more than 60% and can be up to 80%, and power consumption is reduced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulsed moving bed drying apparatus, comprising: the device comprises a shell, a pulsating moving bed drying unit and a material cooler; the casing is vertical structure, and it includes: the chamber is arranged at the feeding part and the air outlet at the upper end of the shell, and the discharge hopper is arranged at the lower end of the shell;

the pulsating moving bed drying equipment comprises a pulsating drying unit and a moving bed drying unit which are arranged in the shell, the pulsating drying unit is positioned below the feeding part, and the moving bed drying unit is positioned below the pulsating drying unit; a pulsating air distribution device with an air distribution port facing the feeding part is arranged between the pulsating drying unit and the moving bed drying unit and below the moving bed drying unit; the material cooler is connected with the discharge hopper, and an air distribution cone is arranged between the upper part of the moving bed drying unit and the lower part of the pulsating air distribution device.

2. A pulsed moving bed drying apparatus according to claim 1, wherein the feeding section comprises a rotary feeding valve, a rotary distributor and a motor-reducer system, the rotary feeding valve is fixedly installed on the top surface of the housing, the rotary distributor is located in the housing and installed on the rotary feeding valve, and the motor-reducer system is in mechanical transmission connection with both the rotary feeding valve and the rotary distributor.

3. A pulsed moving bed drying apparatus according to claim 2, wherein the rotary feed valve is provided with a steam escape outlet which is connected to a dust separator.

4. A pulsed moving bed drying apparatus according to claim 1, wherein the air distribution cone is of an inverted "V" configuration.

5. A pulsating moving bed drying apparatus as claimed in any one of claims 1 to 4, wherein said pulsating drying unit comprises a pulsating dryer, a gas distribution device, a pulsating rotary valve mounted at the inlet of the gas distribution device between the pulsating dryer and the moving bed drying unit, the pulsating rotary valve and the gas distribution device together forming said pulsating gas distribution device, said pulsating drying unit being in one group or in vertically arranged groups.

6. A pulsed moving bed drying apparatus according to claim 5, wherein the pulsed dryer is a vertical plate heat exchanger.

7. A pulsed moving bed drying apparatus according to claim 5, wherein the gas distribution device comprises a plurality of gas distribution pipes arranged at intervals.

8. A pulsed moving bed drying apparatus according to claim 7, wherein each gas distribution pipe comprises a gas distribution header pipe and a hood, and the hood is mounted on the gas distribution header pipe and is communicated with the gas distribution header pipe.

9. A pulsed moving bed drying apparatus according to any one of claims 1 to 4, wherein the moving bed drying unit is a horizontal tube type, U-shaped tube type, coil type or plate type heat exchanger, the lower part of the moving bed drying unit is a calandria type air distribution pipe, the heat exchanger and the air distribution pipe form a moving bed drying unit group, and the moving bed drying unit is a group or a plurality of groups arranged vertically.

10. A pulsed moving bed drying apparatus according to any one of claims 1 to 4, wherein the lower port of the discharge hopper is fitted with a sealed discharger.