CN113280614A - Wet powder drying system based on closed-loop conveying - Google Patents
Wet powder drying system based on closed-loop conveying Download PDFInfo
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- CN113280614A CN113280614A CN202110626085.4A CN202110626085A CN113280614A CN 113280614 A CN113280614 A CN 113280614A CN 202110626085 A CN202110626085 A CN 202110626085A CN 113280614 A CN113280614 A CN 113280614A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
- F26B17/101—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis
- F26B17/105—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis the shaft or duct, e.g. its axis, being other than straight, i.e. curved, zig-zag, closed-loop, spiral
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/007—Dust filtering; Exhaust dust filters
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a wet powder drying system based on closed-loop conveying, which comprises a wet powder discharging bin, wherein the bottom of the wet powder discharging bin is connected with an inlet end of a cyclone separator through a feeding pipeline, the feeding pipeline is also connected with a hot air unit, a material outlet end of the cyclone separator is connected with a dry powder bin, an air outlet end of the cyclone separator is connected with an air inlet at the lower part of a bag-type dust remover through a pipeline, an air outlet at the upper part of the bag-type dust remover is connected with an organic matter recovery device through a pipeline, the bottom of the bag-type dust remover is connected with the dry powder bin, and a control valve a is connected on the pipeline between the bag-type dust remover and the organic matter recovery device; the wet powder is driven to flow in the pipeline by hot air flow; the pipeline is heated, so that the airflow is heated, hot airflow can be provided for wet powder, and the wet powder is conveniently conveyed and dried; the separation efficiency of the materials in the cyclone separator is also high; through the control of the air supply control valve group, the air pressure balance in the closed-loop conveying and drying system is realized and the material atmosphere requirement is met.
Description
Technical Field
The invention belongs to the technical field of wet powder conveying equipment, and particularly relates to a wet powder drying system based on closed-loop conveying.
Background
In the chemical production process, materials with large water content or liquid content are generally called wet powder, and the wet powder is generally conveyed to drying equipment for dehydration or liquid removal, and then enters the next stage of process. The wet powder contains liquid, so that the fluidity of the wet powder is poor, the viscosity of the wet powder is enhanced, and the wet powder is difficult to convey, particularly for a long distance. In addition, due to the fact that moisture, organic matters, harmful gases and the like exist in the materials, accidents such as material blockage, evaporative gas leakage and the like easily occur to drying equipment, and environmental protection and safety do not reach the standard. At present, manual emptying is basically used for long-distance conveying, a carrying vehicle is conveyed to a drying working section, and materials are poured into drying equipment through manual hoisting equipment. The short-distance conveying adopts spiral conveying, scraper conveying, belt conveying and the like. Because part of liquid can be volatilized in the wet powder conveying process, organic wastes are leaked, and the closed conveying can only be adopted. The organic matters volatilized during the conveying and drying processes must be recovered, and when the conveying amount is increased, the recovery device is quite complex and large.
Disclosure of Invention
The invention aims to provide a wet powder drying system based on closed-loop conveying, which can convey and dry wet powder in a closed-loop state through hot air flow.
The technical scheme includes that the wet powder drying system based on closed-loop conveying comprises a wet powder discharging bin, the bottom of the wet powder discharging bin is connected with an inlet end of a cyclone separator through a conveying pipeline, the conveying pipeline is further connected with a hot air unit, a material outlet end of the cyclone separator is connected with a dry powder bin, an air outlet end of the cyclone separator is connected with an air inlet at the lower portion of a bag-type dust collector through a pipeline, an air outlet at the upper portion of the bag-type dust collector is connected with an organic matter recovery device on one hand through a pipeline, a roots blower of the hot air unit is connected back on the other hand, the bottom of the bag-type dust collector is connected with the dry powder bin, and a control valve a is connected to the pipeline between the bag-type dust collector and the organic matter recovery device.
The invention is also characterized in that:
the hot air unit comprises a Roots blower, the Roots blower is connected with a feeding pipeline through an air supply pipeline, a heating structure is connected on the air supply pipeline, the inlet end of the Roots blower is connected with an outlet on the upper part of a bag-type dust remover through a pipeline, and an air adjusting valve is connected on the pipeline between the inlet end of the Roots blower and the bag-type dust remover.
The heating structure is a heat exchanger, two pipeline passages are arranged in the heat exchanger, one pipeline passage is internally connected with an air supply pipeline, and the other pipeline passage is internally connected with a heat supply pipeline.
The heating structure is a heater.
The air supply pipeline is connected with an air supplement pipeline, and the air supplement pipeline is connected with a control valve group b.
The material outlet end of the cyclone separator is connected with a dry powder bin through a star-shaped blanking valve a.
An outlet at the bottom of the wet powder discharging bin is connected with a screw conveyor through a hose, and an outlet of the screw conveyor is communicated with a star-shaped discharging valve b.
The star-shaped blanking valve b is connected with a material conveying pipeline.
The upper part of the bag-type dust collector is communicated with a compressed gas pipeline, and the compressed gas pipeline is connected with a control valve c.
And a gas concentration detector or a pressure sensor is connected between the pipelines between the control valve a and the bag-type dust remover.
The invention has the beneficial effects that:
1) the gas flow with a certain flow speed is provided by the Roots blower, so that the wet powder can be driven to flow in the pipeline;
2) the pipeline is heated through the heating structure, so that the airflow is heated, hot airflow can be provided for wet powder, and the wet powder is convenient to dry;
3) the star-shaped blanking valve b is connected at the discharge port of the screw conveyor and is matched with the screw conveyor to stably and quantitatively feed materials into the system, and due to the special structure of the star-shaped blanking valve, the upper and lower air pressures of the valve can be isolated to play a role in locking air, so that the materials can be prevented from being back-blown by high-speed air flow in the system;
4) the collection of the dried material is realized by a cyclone separator, and the material powder is separated from the airflow by utilizing the centrifugal force generated when the gas-solid mixture rotates at high speed in the conical barrel and is discharged from a powder outlet at the bottom of the barrel to enter a material collection bin; the centrifugal force borne by the material particles is far greater than the gravity and the inertia force, so the separation efficiency is high;
5) the airflow separated by the cyclone separator may still contain trace powder, so that the airflow enters the bag-type dust remover for secondary separation, and clean gas at the outlet of the dust remover can circularly enter the Roots blower without damaging the Roots blower;
6) a gas concentration detector is arranged behind the bag-type dust collector, when the concentration of organic matters in the gas reaches a certain value, the organic matter recovery device is started to recover the organic matters, and thus harmful gas volatilized by drying wet powder can not pollute the environment;
7) in the operation process of the system, when the air pressure in the system is lower than a set value, the air supplementing control valve group is automatically opened to supplement air into the system so as to ensure that the atmosphere and the pressure in the system meet the requirements of conveying and drying materials;
8) and the airflow closed-loop flow is adopted, so that the heat energy can be recycled, the material drying efficiency is greatly improved, and the energy conservation and emission reduction are realized.
Drawings
FIG. 1 is a schematic diagram of a wet powder conveying and drying system according to the present invention;
in the figure, 1, a Roots blower, 2, an air adjusting valve, 3, an organic matter recovery device, 4, a control valve a, 5, a bag-type dust remover, 6, a control valve c, 7, a cyclone separator, 8, a star-shaped discharging valve a, 9, a gas concentration detector, 10, an air supply pipeline, 11, a wet powder discharging bin, 12, a spiral conveyor, 13, a dry powder bin, 14, a star-shaped discharging valve b, 15, a heating structure, 16, a control valve group b, 17 and a hose.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a wet powder drying system based on closed-loop conveying, which comprises a wet powder discharging bin 11 capable of containing wet powder, wherein the bottom of the wet powder discharging bin 11 is connected with a spiral conveyer 12, the outlet of the spiral conveyer 12 is connected with a star-shaped discharging valve 14, the outlet of the discharging valve is connected with the inlet end of a cyclone separator 7 through a conveying pipeline, the conveying pipeline can convey the wet powder in the wet powder discharging bin 11 to the cyclone separator 7, meanwhile, the conveying pipeline is also connected with a hot air unit, the hot air unit can provide hot air flow for the conveying pipeline to dry the wet powder under the action of hot air flow, the material outlet end of the cyclone separator 7 is connected with a dry powder bin 13, the dry powder bin 13 can contain powder materials after powder-gas separation, the air outlet end of the cyclone separator 7 is connected with the air inlet at the lower part of a bag-type dust collector 5 through a pipeline, and the bag-type dust collector 5 can further filter the hot air flow mixed with the powder materials, and the powdery material is recovered to the dry powder bin 13, the air outlet on the upper part of the bag-type dust collector 5 is connected with the organic matter recovery device 3 through a pipeline, the organic matter recovery device 3 can recover the gas in the system, and the pipeline between the bag-type dust collector 5 and the organic matter recovery device 3 is connected with a control valve a 4.
The hot air unit includes the roots blower 1 and a heating structure 15.
Roots blower 1 is as the system power supply, connect the pipeline feeding through supply air duct 10, can provide the air current for the pipeline feeding, connect heating structure 15 on the supply air duct 10, heating structure 15 can heat the air current, so that dry wet powder, the air outlet on 5 upper portions of sack cleaner are passed through to 1 entry end of Roots blower, connect air regulating valve 2 on the pipeline between 1 entry end of Roots blower and sack cleaner 5, 1 air-out size of Roots blower can be adjusted to air regulating valve 2.
The heating structure 15 is a heat exchanger for providing heat energy for the system, and the heat exchanger comprises two pipeline passages, wherein the air supply pipeline 10 is connected in one pipeline passage, and the heat supply pipeline is connected in the other pipeline passage.
The heating structure 15 is a heater.
The air supply pipeline 10 is connected with an air supplement pipeline, the air supplement pipeline is connected with a control valve group b16, the air supplement pipeline can compensate loss pressure and pressure released by organic matter recovery for the system, and the pressure in the pipeline is maintained at a set value through a control valve group b 16.
The material outlet end of the cyclone separator 7 is connected with the dry powder bin 13 through a star-shaped discharging valve a8, and the star-shaped discharging valve a8 has an air locking function and can prevent air flow from blowing back the materials.
The outlet at the bottom of the wet powder discharging bin 11 is connected with the screw conveyor 12 through the hose 17, the screw conveyor 12 is communicated with the feeding pipeline, and the problem that discharging is slow or the outlet of the bin is blocked due to large humidity of wet powder can be solved by the screw conveyor 12.
The discharge port of the screw conveyer 12 is connected with a star-shaped discharge valve b14, and the star-shaped discharge valve b14 comprises a rotor impeller with a plurality of blades, a shell, a sealing element, a speed reducer, a motor and the like, so that when materials falling from an upper hopper are filled in spaces among the blades and are discharged along with the rotation of the blades, the materials can be stably, uniformly and continuously fed into the conveying pipe, and meanwhile, the air pressure of the upper part and the lower part of the valve can be separated to play a role in locking air, and the materials can be prevented from being back blown by air flow.
The lower part of the bag-type dust collector 5 is connected with an air inlet, dust-containing airflow enters the bag-type dust collector 5 from the air inlet, the upper part of the bag-type dust collector 5 is connected with an air outlet, and clean airflow enters the air pipeline from the air outlet. The bag-type dust collector 5 is communicated with a compressed gas pipeline simultaneously, the compressed gas pipeline is connected with a control valve c6, compressed gas is provided from the outside, and the ash removal controller of the bag-type dust collector 5 is driven to shake off and recycle the attached powdery materials on the bag to the dry powder bin.
The gas concentration detector 9 is connected in the pipeline between the control valve a4 and the bag-type dust collector 5, when the concentration of organic matters or the pressure of the pipeline reaches a set value, the organic matter recovery device is opened to recover the organic matters, so that the harmful gas volatilized by drying the wet powder can not pollute the environment.
The invention relates to a use method of a wet powder drying system based on closed-loop conveying, which comprises the following steps:
wet powder is added into a wet powder discharging bin 11, a Roots blower 1 is opened to generate airflow, meanwhile, a heating structure 15 is started to heat an air supply pipeline 10, the airflow of the air supply pipeline 10 is changed into hot airflow, a star-shaped discharging valve b14 is opened, wet materials in the wet powder discharging bin 11 enter the air supply pipeline 10 under the action of a screw conveyor 12, the wet powder flows in the air supply pipeline 10 along the airflow direction under the driving of the hot airflow, because the temperature of the hot airflow is relatively high, in the flowing process of the wet powder, the moisture in the wet powder is changed into water vapor, the wet powder is gradually dried into dry powder with better fluidity, after passing through a cyclone separator 7, the dried powder material is separated from organic gas and water vapor mixed in the powder material, the star-shaped discharging valve a8 is opened, the powder material enters a dry powder bin 13, a small amount of powder material is mixed in the other part of gas and water vapor, and the part enters a bag-type bag dust collector 5, wherein a small amount of powdery material is attached to the built-in sack of sack cleaner 5, gas and vapor then because high temperature and gaseous flow effect discharge sack cleaner 5, carry out organic gas concentration or pressure detection through gas concentration detector or pressure detector 9 in the pipeline afterwards, when concentration or pressure reach the setting value, open control valve a4, gas gets into organic matter recovery unit 3, when concentration or pressure are not high, this part gas gets into roots blower 1, carry out next air current circulation, this mode can reduce energy loss.
When the air pressure in the system is too low to reach the set air pressure, the system automatically opens the control valve set b16, and air is supplied to the air supply pipeline 10 through the air supply pipeline, so as to ensure that the air pressure in the system is maintained at the set value. If the original wet powder material needs to be protected by inert gas in the drying process, the inert gas is supplemented into the air supply pipeline 10 through the air supplement pipeline by opening the control valve group b 16.
When enough powdery materials are attached to the inner wall of the bag-type dust collector 5 and the resistance of the bag-type dust collector reaches a set value, the control valve c6 is opened, compressed gas is introduced into the dust cleaning control valve of the bag-type dust collector 5 through a compressed gas pipeline, and the powdery materials are shaken off into the dry powder material bin 13.
Through the mode, the wet powder drying system based on closed-loop conveying can supply airflow power sources to the whole set of system by the Roots blower when the wet powder drying system works and is used, so that the airflow in the system has certain power to drive materials to flow forwards. The heat exchanger or the heater is a heat energy source of the whole system, and the working temperature of the heat exchanger or the heater can be set, so that the temperature of air flow in the system is ensured, and meanwhile, the materials cannot be subjected to phase change. When the air current reachd set concentration or pressure, the outside gas is constantly mended, prevents effectively that the condensate from appearing in material collection department, influences the dry effect of material. This system can increase a plurality of material entries according to actual demand. The putting speed of screw conveyer accessible motor speed regulation and control material sets for the material according to material humidity and puts in speed, makes the material not only fully dry and can guarantee the output maximize. The star-shaped discharge valve connected between the material feed port bin and the conveying pipeline can be matched with a screw conveyor to stably and quantitatively feed materials, and has an air locking function to prevent air flow from back blowing the materials; the dried material is collected by a cyclone separator, and material powder is separated from air flow by using centrifugal force generated when the gas-solid mixture rotates at high speed in the conical barrel and is discharged from a powder outlet at the bottom of the barrel to enter a material collecting bin. The centrifugal force on the material particles is far greater than the gravity and the inertia force, so the separation efficiency is higher. The airflow separated by the cyclone separator may still contain trace powder, so the airflow enters the bag-type dust remover for secondary separation, and the dust removal efficiency of the bag-type dust remover can reach more than 99%, so that the gas at the outlet of the dust remover can circularly enter the Roots blower without damaging the Roots blower. Install organic matter concentration detector behind the sack cleaner, when organic matter concentration reaches a definite value, then organic matter recovery unit opens, retrieves it, so the harmful gas that wet powder dried and volatilize also can not the polluted environment. The system pipeline is provided with an air or nitrogen supplementing port to meet the requirement of drying atmosphere for different materials. The whole drying system has closed-loop airflow flow, so that heat energy can be recycled, the material drying efficiency is greatly improved, and energy conservation and emission reduction are realized.
Claims (10)
1. A wet powder drying system based on closed-loop conveying is characterized by comprising a wet powder discharging bin (11), the bottom of the wet powder discharging bin (11) is connected with a star-shaped discharging valve (14) through a screw conveyer (12), the outlet of the star-shaped blanking valve (14) is connected with the inlet end of the cyclone separator (7), the feeding pipeline is also connected with a hot air unit, the material outlet end of the cyclone separator (7) is connected with a dry powder bin (13), the air outlet end of the cyclone separator (7) is connected with an air inlet at the lower part of the bag-type dust collector (5) through a pipeline, the air outlet at the upper part of the bag-type dust collector (5) is connected with an organic matter recovery device (3) through a pipeline on the one hand and a ventilating pipeline of the Roots blower (1) on the other hand, the dry powder bin (13) is connected to sack cleaner (5) bottom, connect control valve a (4) on the pipeline between sack cleaner (5) and organic matter recovery unit (3).
2. The wet powder drying system based on closed loop conveying is characterized in that the hot air unit comprises a roots blower (1), the roots blower (1) is connected with a feeding pipeline through a blast pipeline (10), a heating structure (15) is connected on the blast pipeline (10), the inlet end of the roots blower (1) is connected with an air outlet at the upper part of a bag-type dust remover (5) through a pipeline, and an air adjusting valve (2) is connected on the pipeline between the inlet end of the roots blower (1) and the bag-type dust remover (5).
3. The wet powder drying system based on closed-loop conveying according to claim 2, wherein the heating structure (15) is a heat exchanger, and two pipeline passages are included in the heat exchanger, wherein one pipeline passage is internally connected with the air supply pipeline (10), and the other pipeline passage is internally connected with the heat supply pipeline.
4. A wet powder drying system based on closed loop transport according to claim 2, characterized in that the heating structure (15) is a heater.
5. The wet powder drying system based on closed-loop conveying is characterized in that an air supply pipeline is connected to the air supply pipeline (10), and a control valve group b (16) is connected to the air supply pipeline.
6. The wet powder drying system based on closed-loop conveying is characterized in that the material outlet end of the cyclone separator (7) is connected with a dry powder bin (13) through a star-shaped blanking valve a (8).
7. The wet powder drying system based on closed-loop conveying is characterized in that the outlet at the bottom of the wet powder discharging bin (11) is connected with a screw conveyor (12) through a hose (17), and the screw conveyor (12) is communicated with a feeding pipeline.
8. A wet powder drying system based on closed loop conveying according to claim 1, characterized in that a star-shaped blanking valve b (14) is connected at the discharge port of the screw conveyor (12).
9. The wet powder drying system based on closed-loop conveying is characterized in that an air outlet at the upper part of the bag-type dust collector (5) is communicated with an air inlet pipeline of the Roots blower (1), a compressed gas pipeline is communicated with the upper part of the bag-type dust collector (5), and a control valve c (6) is connected to the compressed gas pipeline.
10. The wet powder drying system based on closed-loop conveying is characterized in that a pipeline between the control valve a (4) and the bag-type dust collector (5) is connected with a gas concentration detector (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110626085.4A CN113280614A (en) | 2021-06-04 | 2021-06-04 | Wet powder drying system based on closed-loop conveying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110626085.4A CN113280614A (en) | 2021-06-04 | 2021-06-04 | Wet powder drying system based on closed-loop conveying |
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| CN113280614A true CN113280614A (en) | 2021-08-20 |
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| CN202110626085.4A Pending CN113280614A (en) | 2021-06-04 | 2021-06-04 | Wet powder drying system based on closed-loop conveying |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114408582A (en) * | 2022-02-23 | 2022-04-29 | 青岛天人环境股份有限公司 | Straw crushed aggregates conveying device for biogas engineering |
| CN116588695A (en) * | 2023-04-04 | 2023-08-15 | 湖北潜江江汉环保有限公司 | Circulating fluidization negative pressure dilute phase dust pneumatic ash conveying and discharging system |
-
2021
- 2021-06-04 CN CN202110626085.4A patent/CN113280614A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114408582A (en) * | 2022-02-23 | 2022-04-29 | 青岛天人环境股份有限公司 | Straw crushed aggregates conveying device for biogas engineering |
| CN116588695A (en) * | 2023-04-04 | 2023-08-15 | 湖北潜江江汉环保有限公司 | Circulating fluidization negative pressure dilute phase dust pneumatic ash conveying and discharging system |
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