CN111059890B - Material drying system and method - Google Patents

Material drying system and method Download PDF

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Publication number
CN111059890B
CN111059890B CN201911344296.8A CN201911344296A CN111059890B CN 111059890 B CN111059890 B CN 111059890B CN 201911344296 A CN201911344296 A CN 201911344296A CN 111059890 B CN111059890 B CN 111059890B
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drying
dehumidifying
air
circulating pump
inlet
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CN111059890A (en
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李明
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001Drying-air generating units, e.g. movable, independent of drying enclosure
    • F26B21/25
    • F26B21/33
    • F26B21/50
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001Handling, e.g. loading or unloading arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/80Water
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a material drying system and a material drying method, wherein the material drying system comprises a drying, dehumidifying and regenerating unit, the drying, dehumidifying and regenerating unit comprises a drying system for drying wet materials by using dry air, a dehumidifying system for dehumidifying the wet air by working liquid and an MVR regenerating system for evaporating and concentrating the working liquid, the drying system is connected with the dehumidifying system by a pipeline, and the dehumidifying system is connected with the MVR regenerating system by a pipeline. The material drying method comprises a drying step of drying the wet material by using dry air, a dehumidifying step of dehumidifying the wet air by using the working solution and an MVR regenerating step of evaporating and concentrating the working solution. According to the invention, the wet material is dried by using dry air, the wet air is dehumidified by using the working solution, the working solution is concentrated and regenerated by using the MVR system, and the sensible heat of the dried material is recovered by using the heat recovery system, so that the material drying energy consumption is reduced, and the environmental pollution is reduced.

Description

Material drying system and method
Technical Field
The invention relates to a material drying system and a material drying method, in particular to a material drying system and a material drying method for regenerating MVR through solution dehumidification and drying, and belongs to the technical field of energy conservation and environmental protection.
Background
The material drying relates to a plurality of industries, the drying operation often becomes a main energy consumption link of the production process, and the pollution of a drying unit to the environment is often quite serious, so that the energy saving, consumption reduction and clean production also become important targets of the technology of the drying industry. The existing drying process mainly adopts fossil energy combustion to provide external heat sources such as hot air, steam, flue gas and the like to heat the dried materials or adopts inverse Carnot cycle heat pump condensation or an extension conversion technology to dehumidify the dried materials, has high energy consumption and operation cost, is inconvenient to remotely monitor and manage, and simultaneously causes the emission of waste gas or greenhouse gas which brings environmental problems.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a material drying system and a material drying method which are low in energy consumption and running cost, convenient to monitor and manage remotely and free from environmental pollution and greenhouse gas emission.
The material drying system comprises a drying, dehumidifying and regenerating unit, wherein the drying, dehumidifying and regenerating unit comprises a drying system for drying wet materials by using dry air, a dehumidifying system for dehumidifying the wet air by using working liquid and an MVR regenerating system for evaporating and concentrating the working liquid, the drying system is connected with the dehumidifying system by a pipeline, and the dehumidifying system is connected with the MVR regenerating system by a pipeline.
The drying system comprises a feeding hopper, a feeding machine, a material distributor, a dryer, a discharging hopper, a circulating fan and an air inlet pipe, wherein the feeding hopper is connected with the material distributor through the feeding machine, the material distributor is connected with the dryer, the circulating fan is connected with the dryer through the air inlet pipe, and the discharging hopper is connected with the dryer.
The dehumidification system comprises an air return pipe, a dehumidifier, a demister and a dehumidification circulating pump, wherein the dryer of the drying system is connected with the dehumidifier through the air return pipe, the demister is connected with the dehumidifier, and an inlet and an outlet of the dehumidification circulating pump are connected with the dehumidifier through a pipeline.
The MVR regeneration system comprises a working fluid discharge pump, a heat exchanger, an MVR compressor, a separator, an evaporation demister, an evaporation circulating pump and a regeneration fluid return pipe, wherein an inlet and an outlet of the working fluid discharge pump are respectively connected with a dehumidifier and a heat exchanger inlet of the dehumidification system through pipelines, an outlet of the heat exchanger is connected with the separator through pipelines, the evaporation demister is connected with the separator, an inlet and an outlet of the MVR compressor are respectively connected with a separator air outlet and a heat exchanger air inlet through pipelines, an inlet and an outlet of the evaporation circulating pump are respectively connected with a separator discharge port and a heat exchanger inlet through pipelines, and the regeneration fluid return pipe is connected with an outlet of the evaporation circulating pump and a dehumidifying circulating pump inlet of the dehumidification system.
The invention further comprises a heat recovery unit, wherein the heat recovery unit comprises a heat exchange circulating pump and a heat exchange pipe, and the material distributor of the drying system is connected with a discharge hopper of the drying system through the heat exchange pipe and the heat exchange circulating pump.
The invention further comprises an electrical control unit, wherein the electrical control unit is an automatic control cabinet with a PLC program control and remote communication module.
The material drying method comprises a drying step of drying a wet material by using dry air, a dehumidifying step of dehumidifying the wet air by using working fluid and an MVR regeneration step of evaporating and concentrating the working fluid.
The specific method for the drying step comprises the following steps:
Uniformly distributing the wet materials in the feed hopper on a dryer through a feeding machine and a material distributor;
The dry and hot air enters a dryer through an air inlet pipe by a circulating fan to exchange heat with wet materials and evaporate;
And (A3) discharging the dry materials out of the dryer through a discharge hopper.
The specific method for the dehumidification step comprises the following steps:
The wet air after the dry material absorbs moisture enters a dehumidifier through a return air pipe;
the dehumidification circulating pump lifts the sprayed working solution to perform heat and mass exchange with the wet air;
And (B3) collecting water mist from the dehumidified air by a demister and then entering an air return pipe.
The MVR regeneration step comprises the following specific steps:
Working fluid in a dehumidifier of the dehumidification system is mixed with regeneration fluid at an outlet of an evaporation circulating pump through a working fluid discharging pump and enters a heat exchanger for heat exchange;
step (C2), the mixed liquid heated by the heat exchanger enters a separator for evaporation and concentration;
step (C3), secondary steam generated by evaporation is subjected to vapor-liquid separation by an evaporation demister and then enters an MVR compressor for compression and heating;
The vapor after the compression and the temperature rise enters a heat exchanger to exchange heat with the working liquid and is condensed into liquid water to be discharged;
And (C5) conveying the regenerated liquid in the separator into the heat exchanger through the evaporation circulating pump for circulating heating, and enabling part of the regenerated liquid to enter a liquid inlet of a dehumidification circulating pump of the dehumidification system through a regenerated liquid feed back pipe to supplement the dehumidification working liquid.
The drying, dehumidifying and regenerating process system and method provided by the invention have the beneficial effects that (1) the regeneration energy consumption of working solution in the prior art can be reduced, the sensible heat of dry and hot materials is recovered, the running cost of the existing drying process is further reduced, (2) the automatic control cabinet with the remote communication module provided by the system can solve the problem of inconvenient remote monitoring and management of the existing drying system, and (3) the drying, dehumidifying and MVR regenerating process provided by the invention can solve the environmental problem caused by the emission of waste gas or greenhouse gas in the prior art.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure, 1, a feeding machine, 2, a material distributor, 3, a dryer, 4, a return air pipe, 5, a demister, 6, a control cabinet, 7, an MVR compressor, 8, a condensing heat exchanger, 9, an evaporation demister, 10, a feed hopper, 11, a heat exchange circulating pump, 12, a heat exchange pipe, 13, an air inlet pipe, 14, a discharge hopper, 15, a circulating fan, 16, a dehumidifier, 17, a dehumidifying circulating pump, 18, a working fluid discharge pump, 19, a regeneration fluid return pipe, 20, an evaporation circulating pump, 21 and a separator.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the inventive features, the achieved objects and the effects of the invention easy to understand.
As shown in fig. 1, the material drying system of the present invention includes a drying, dehumidifying and regenerating unit, a heat recovery unit and an electrical control unit.
The drying, dehumidifying and regenerating unit comprises a drying system for drying the wet materials by utilizing dry air, a dehumidifying system for dehumidifying the wet air by utilizing working fluid and an MVR regenerating system for evaporating and concentrating the working fluid, wherein the drying system is connected with the dehumidifying system through a pipeline, and the dehumidifying system is connected with the MVR regenerating system through a pipeline.
The drying system comprises a feed hopper 10, a feeding machine 1, a material distributor 2, a dryer 3, a discharge hopper 14, a circulating fan 15 and an air inlet pipe 13, wherein the feed hopper 10 is connected with the material distributor 2 through the feeding machine 1, the material distributor 2 is connected with the dryer 3, the circulating fan 15 is connected with the dryer 3 through the air inlet pipe 13, and the discharge hopper 14 is connected with the dryer 3.
The dehumidification system comprises an air return pipe 4, a dehumidifier 16, a demister 5 and a dehumidification circulating pump 17, wherein the dryer 3 of the drying system is connected with the dehumidifier 16 through the air return pipe 4, the demister 5 is connected with the dehumidifier 16, and an inlet and an outlet of the dehumidification circulating pump 17 are connected with the dehumidifier 16 through a pipeline.
The MVR regeneration system comprises a working fluid discharging pump 18, a heat exchanger 8, an MVR compressor 7, a separator 21, an evaporation demister 9, an evaporation circulating pump 20 and a regeneration fluid return pipe 19, wherein an inlet and an outlet of the working fluid discharging pump 18 are respectively connected with an inlet of the dehumidifier 16 and an inlet of the heat exchanger 8 of the dehumidification system through pipelines, an outlet of the heat exchanger 8 is connected with the separator 21 through a pipeline, the evaporation demister 9 is connected with the separator 21, an inlet and an outlet of the MVR compressor 7 are respectively connected with an air outlet of the separator 21 and an air inlet of the heat exchanger 8 through pipelines, an inlet and an outlet of the evaporation circulating pump 20 are respectively connected with an outlet of the separator 21 and an inlet of the heat exchanger 8 through pipelines, and the regeneration fluid return pipe 19 is connected with an outlet of the evaporation circulating pump 20 and an inlet of the dehumidification circulating pump 17 of the dehumidification system.
The heat recovery unit comprises a heat exchange circulating pump 11 and a heat exchange pipe 12, and the material distributor 2 of the drying system is connected with a discharge hopper 14 of the drying system through the heat exchange pipe 12 and the heat exchange circulating pump 11.
The electric control unit is an automatic control cabinet 6 with a PLC program control and remote communication module, and the feeding machine 1, the material distributor 2, the dryer 3, the heat exchange circulating pump 11, the circulating fan 15, the dehumidification circulating pump 17, the working fluid discharging pump 18, the MVR compressor 7 and the evaporation circulating pump 20 are respectively and electrically connected with the automatic control cabinet 6.
The implementation step of the material drying system comprises a drying step of drying wet materials by using dry air, a dehumidifying step of dehumidifying the wet air by using working fluid and an MVR regeneration step of evaporating and concentrating the working fluid. The drying step is specifically as follows:
The wet materials in the feed hopper 10 are uniformly distributed on the dryer 3 through the feeding machine 1 and the material distributor 2;
the dry and hot air enters the dryer 3 through the air inlet pipe 13 by the circulating fan 15 to exchange heat with wet materials and evaporate;
in step (A3), the dry material exits the dryer 3 through the hopper 14.
The dehumidifying step comprises the following steps:
the wet air after the dry material absorbs moisture enters a dehumidifier 16 through a return air pipe 4;
the dehumidification circulating pump 17 lifts the sprayed working solution to carry out heat and mass exchange with the wet air;
and (B3) the dehumidified air is captured by the demister 5 and enters the return air pipe 4.
The MVR regeneration step is specifically:
The working solution in the dehumidifier 16 of the dehumidification system is mixed with the regeneration solution at the outlet of the evaporation circulating pump 20 through the working solution discharging pump 18 and enters the heat exchanger 8 for heat exchange;
step (C2), the mixed liquid heated by the heat exchanger 8 enters a separator 21 for evaporation and concentration;
The secondary steam generated by evaporation is subjected to vapor-liquid separation by an evaporation demister 9 and then enters an MVR compressor 7 for compression and heating;
The vapor after the compression and the temperature rise enters a heat exchanger 8 to exchange heat with the working solution and is condensed into liquid water to be discharged;
And (C5) conveying the regenerated liquid in the separator 21 into the heat exchanger 8 through the evaporation circulating pump 20 for circulating heating, and conveying part of the regenerated liquid into a liquid inlet of a dehumidification circulating pump 17 of the dehumidification system through a regenerated liquid feed back pipe 19 to supplement the dehumidification working liquid.
According to the invention, the wet material is dried by using dry air, the wet air is dehumidified by using the working solution, the working solution is concentrated and regenerated by using the MVR system, and the sensible heat of the dried material is recovered by using the heat recovery system, so that the material drying energy consumption is reduced, and the environmental pollution is reduced.
The heat recovery implementation step of the material drying system comprises the step of circularly conveying the dry hot materials in the discharge hopper 14 through circulating water in the heat exchange pipe 12 and the heat exchange circulating pump 11 to exchange heat with the wet materials in the material distributor 2 so as to recover sensible heat of the dry hot materials.
The automatic control and remote communication implementation steps of the material drying system comprise the steps of respectively and electrically connecting a feeding machine 1, a material distributor 2, a dryer 3, a heat exchange circulating pump 11, a circulating fan 15, a dehumidifying circulating pump 17, a working fluid discharging pump 18, an MVR compressor 7 and an evaporation circulating pump 20 with an automatic control cabinet 6, wherein the automatic control cabinet 6 supplies power to the feeding machine 1, the material distributor 2, the dryer 3, the heat exchange circulating pump 11, the circulating fan 15, the dehumidifying circulating pump 17, the working fluid discharging pump 18, the MVR compressor 7 and the evaporation circulating pump 20 and coordinates the smooth operation of all the equipment according to a set program, and simultaneously, signals such as the running state and faults of the system are transmitted outwards through a built-in functional module so as to be convenient for remote monitoring and management.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention, so that all changes which come within the meaning and range of equivalents of the method steps or steps of the invention are deemed to be within the scope of the invention.

Claims (2)

1. The material drying system is characterized by comprising a drying, dehumidifying and regenerating unit, wherein the drying, dehumidifying and regenerating unit comprises a drying system for drying wet materials by using dry air, a dehumidifying system for dehumidifying the wet air by working liquid and an MVR regenerating system for evaporating and concentrating the working liquid;
The drying system comprises a feeding hopper (10), a feeding machine (1), a material distributor (2), a dryer (3), a discharging hopper (14), a circulating fan (15) and an air inlet pipe (13), wherein the feeding hopper (10) is connected with the material distributor (2) through the feeding machine (1), the material distributor (2) is connected with the dryer (3), the circulating fan (15) is connected with the dryer (3) through the air inlet pipe (13), and the discharging hopper (14) is connected with the dryer (3);
The dehumidification system comprises an air return pipe (4), a dehumidifier (16), a demister (5) and a dehumidification circulating pump (17), wherein a dryer (3) of the drying system is connected with the dehumidifier (16) through the air return pipe (4), the demister (5) is connected with the dehumidifier (16), and an inlet and an outlet of the dehumidification circulating pump (17) are connected with the dehumidifier (16) through a pipeline;
The MVR regeneration system comprises a working solution discharging pump (18), a heat exchanger (8), an MVR compressor (7), a separator (21), an evaporation demister (9), an evaporation circulating pump (20) and a regeneration solution feed back pipe (19), wherein an inlet and an outlet of the working solution discharging pump (18) are respectively connected with a dehumidifier (16) of a dehumidification system and an inlet of the heat exchanger (8) through pipelines, an outlet of the heat exchanger (8) is connected with the separator (21) through a pipeline, the evaporation demister (9) is connected with the separator (21), an inlet and an outlet of the MVR compressor (7) are respectively connected with an air outlet of the separator (21) and an air inlet of the heat exchanger (8) through pipelines, an inlet and an outlet of the evaporation circulating pump (20) are respectively connected with an outlet of the separator (21) and an inlet of the heat exchanger (8) through pipelines, and the regeneration solution feed back pipe (19) is connected with an outlet of the evaporation circulating pump (20) and an inlet of the dehumidification circulating pump (17) of the dehumidification system;
The material distributor (2) of the drying system is connected with a discharge hopper (14) of the drying system through the heat exchange pipe (12) and the heat exchange circulating pump (11);
The automatic control system further comprises an electrical control unit, wherein the electrical control unit is an automatic control cabinet (6) with a PLC program control and remote communication module.
2. A material drying method is characterized in that a material drying system comprises a drying, dehumidifying and regenerating unit, the drying, dehumidifying and regenerating unit comprises a drying system for drying wet materials by using dry air, a dehumidifying system for dehumidifying the wet air by using working fluid and an MVR regenerating system for evaporating and concentrating the working fluid, the drying system is connected with the dehumidifying system by a pipeline, the dehumidifying system is connected with the MVR regenerating system by the pipeline, the drying system comprises a feeding hopper (10), a feeding machine (1), a material distributor (2), a drying machine (3), a discharging hopper (14), a circulating fan (15) and an air inlet pipe (13), the feeding hopper (10) is connected with the material distributor (2) by the feeding machine (1), the material distributor (2) is connected with the drying machine (3), the circulating fan (15) is connected with the drying machine (3) by the air inlet pipe (13), the discharging hopper (14) is connected with the drying machine (3), the dehumidifying system comprises a return air pipe (4) and a dehumidifier (16), the system comprises a demister (5) and a dehumidifying circulating pump (17), wherein a dryer (3) of the drying system is connected with a dehumidifier (16) through a return air pipe (4), the demister (5) is connected with the dehumidifier (16), an inlet and an outlet of the dehumidifying circulating pump (17) are connected with the dehumidifier (16) through pipelines, the MVR regenerating system comprises a working fluid discharging pump (18), a heat exchanger (8), an MVR compressor (7), a separator (21), an evaporating demister (9), an evaporating circulating pump (20) and a regenerating fluid return pipe (19), the inlet and the outlet of the working fluid discharging pump (18) are respectively connected with the dehumidifier (16) of the dehumidifying system and the inlet of the heat exchanger (8) through pipelines, the outlet of the heat exchanger (8) is connected with the separator (21) through pipelines, the evaporating demister (9) is connected with the separator (21) through pipelines, the MVR compressor (7) is respectively connected with the air outlet of the separator (21) and the air inlet of the heat exchanger (8), the evaporating circulating pump (20) is respectively connected with the inlet and the evaporator circulating pump (20) through the separator (21) and the inlet of the evaporator circulating pump (19) and the inlet of the regenerating system;
the material drying method of the material drying system comprises a drying step of drying wet materials by using dry air, a dehumidifying step of dehumidifying the wet air by using working fluid and an MVR regeneration step of evaporating and concentrating the working fluid;
The specific method of the drying step comprises the steps of (A1) uniformly distributing wet materials in a feed hopper (10) on a dryer (3) through a feeding machine (1) and a material distributor (2), wherein in the step (A2), dry hot air enters the dryer (3) through an air inlet pipe (13) through a circulating fan (15) to exchange heat with the wet materials and evaporate, and in the step (A3), the dry materials are discharged out of the dryer (3) through a discharge hopper (14);
the specific method of the dehumidification step comprises the steps of (B1) enabling wet air after moisture absorption of the dry materials to enter a dehumidifier (16) through an air return pipe (4), (B2) enabling a dehumidification circulating pump (17) to lift sprayed working solution and the wet air to perform heat and mass exchange, and (B3) enabling the dehumidified air to enter the air return pipe (4) after water mist is captured through a demister (5);
The MVR regeneration step comprises the steps of (C1) mixing working solution in a dehumidifier (16) of a dehumidification system with regenerated solution at an outlet of an evaporation circulating pump (20) through a working solution discharging pump (18) and then entering a heat exchanger (8) for heat exchange, (C2) evaporating and concentrating mixed solution heated by the heat exchanger (8) in a separator (21), (C3) separating vapor and liquid from secondary vapor generated by evaporation through an evaporation demister (9) and then entering an MVR compressor (7) for compression and heating, and (C4) compressing and heating the vapor entering the heat exchanger (8) for heat exchange with the working solution and condensing the vapor into liquid water and then discharging the liquid water, and (C5) conveying regenerated solution in the separator (21) into the heat exchanger (8) through the evaporation circulating pump (20) for circulating heating, and enabling part of the regenerated solution to enter a liquid inlet of a dehumidification circulating pump (17) of the dehumidification system through a regenerated solution return pipe (19) for supplementing the dehumidified working solution.
CN201911344296.8A 2019-12-24 2019-12-24 Material drying system and method Active CN111059890B (en)

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CN211601488U (en) * 2019-12-24 2020-09-29 李明 Material drying system

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