CN112856933A - Horizontal multi-chamber fluidized bed, high-density polyethylene drying system and method - Google Patents
Horizontal multi-chamber fluidized bed, high-density polyethylene drying system and method Download PDFInfo
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- CN112856933A CN112856933A CN201911187544.2A CN201911187544A CN112856933A CN 112856933 A CN112856933 A CN 112856933A CN 201911187544 A CN201911187544 A CN 201911187544A CN 112856933 A CN112856933 A CN 112856933A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/14—Separation 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 by absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/14—Separation 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 by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/14—Separation 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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
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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
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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
- F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
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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
Abstract
The invention relates to a horizontal multi-chamber fluidized bed which is divided into a first section bed body and a second section bed body by a partition plate, wherein the upper parts of the first section bed body and the second section bed body are respectively and independently provided with a plurality of groups of heating pipes, the air inlet of each group of heating pipes is communicated with a steam pipeline, the liquid outlet of each group of heating pipes is communicated with a steam condensate pipeline, the lower parts of the first section bed body and the second section bed body are respectively and independently provided with a plurality of chambers, and the tops of the chambers are provided with gas distribution plates; the top of the first section of bed body is provided with a feed inlet and an exhaust port, and the bottom of the first section of bed body is provided with an air inlet correspondingly communicated with the chamber; the lower part of the clapboard is provided with a discharge opening; the top of the second section of bed body is provided with a reclaimed material inlet and an exhaust port, and the bottom of the second section of bed body is provided with an air inlet communicated with the chamber correspondingly. The invention also relates to a drying system and a drying method for the high-density polyethylene.
Description
Technical Field
The invention relates to a drying method of high-density polyethylene, in particular to a horizontal multi-chamber fluidized bed for drying high-density polyethylene, and a drying system and a drying method of high-density polyethylene based on the horizontal multi-chamber fluidized bed.
Background
Polyethylene is an important petrochemical product, is a nonpolar thermoplastic resin with good physical properties, is widely applied to the industries of food packaging, industrial pipes, automobile covering parts, lithium batteries and the like, and particularly the development of High Density Polyethylene (HDPE) greatly promotes the progress of petrochemical production and the improvement of the living standard of people.
In the production process of high-density polyethylene, polyethylene after centrifugal filtration contains a large amount of solvent (generally hexane, 20-30 wt%), and the solvent needs to be removed for use as a raw material of subsequent products, so that the polyethylene drying and solvent recovery become a key technology of the polyethylene industry along with the requirements of energy conservation, consumption reduction and environmental protection of the industry.
In the existing industry, the high-density polyethylene drying and solvent treatment process mainly comprises steam pipe rotary cylinder drying and paddle drying:
(1) drying in a steam pipe rotary cylinder, mainly adopting low-pressure steam as a drying heat source, taking nitrogen as a drying carrier gas, washing and dedusting the dried tail gas in a washing tower, sequentially feeding the dried tail gas into a subsequent primary cooler and a subsequent secondary cooler from the tower top, heating the cooled dried tail gas by a heater, and feeding the heated dried tail gas into a steam rotary cylinder dryer to realize the circulation of the nitrogen and the recovery of a solvent;
(2) the paddle dryer mainly adopts low-pressure steam as a drying heat source and nitrogen as a drying carrier gas, dry tail gas enters a washing tower for washing and dust removal after being subjected to cloth bag dust removal, and the treated dry tail gas is used as the carrier gas after being heated by a heater.
Aiming at the prior art, the following defects mainly exist:
(1) the high-density polyethylene material contains a large amount of hexane, and has the characteristics of flammability and explosiveness, when the oxygen content in the drying carrier gas exceeds the standard, the danger of explosion and combustion is very easy to occur, and because the steam pipe rotary cylinder dryer and the paddle dryer are both movable equipment, the sealing structure is complex, the risk of leaking into system air is increased, and the danger of system operation is improved.
(2) In the steam pipe rotary cylinder dryer system, the washed dry tail gas needs to be cooled in two stages, the heat exchange area of a cooler is large due to the heat exchange of gas and water, in addition, the specifications of general equipment of the steam pipe rotary cylinder dryer and the paddle dryer are large, the occupied area of the equipment is large, and the investment of the device is increased.
(3) In the drying process of the steam pipe rotary cylinder dryer and the paddle dryer, the retention time of materials is long, and the materials have certain dead zones in the equipment, so that a small amount of materials are melted, and the properties of the product are influenced to a certain degree.
Disclosure of Invention
In order to solve the defects of the prior art, reduce the explosion risk of a hexane solvent in the drying process, reduce the investment of a device, further improve the quality of a product and effectively recover the solvent evaporated in the drying process, the invention provides a horizontal multi-chamber fluidized bed which can be used for drying high-density polyethylene, and a drying system and a drying method of the high-density polyethylene containing the horizontal multi-chamber fluidized bed.
The invention provides a horizontal multi-chamber fluidized bed which is divided into a first section bed body and a second section bed body by a partition plate, wherein the upper parts of the first section bed body and the second section bed body are respectively and independently provided with a plurality of groups of heating pipes, the air inlet of each group of heating pipes is communicated with a steam pipeline, the liquid outlet of each group of heating pipes is communicated with a steam condensate pipeline, the lower parts of the first section bed body and the second section bed body are respectively and independently provided with a plurality of chambers, and the tops of the chambers are provided with gas distribution plates;
the top of the first section of bed body is provided with a feed inlet and an exhaust port, and the bottom of the first section of bed body is provided with an air inlet correspondingly communicated with the chamber;
the lower part of the clapboard is provided with a discharge opening;
the top of the second section of bed body is equipped with reclaimed material import and gas vent, the bottom of the second section of bed body is equipped with rather than the air inlet that the cavity corresponds the intercommunication, the lower part of the second section of bed body is equipped with the discharge gate.
In the horizontal multi-chamber fluidized bed of the present invention, preferably, the partition plate is composed of an upper partition plate and a lower partition plate, and the discharge port is provided between the upper partition plate and the lower partition plate.
In the horizontal multi-chamber fluidized bed of the present invention, preferably, a material distribution plate is disposed below the feed inlet.
In the horizontal multi-chamber fluidized bed, the discharge port is preferably connected with a discharge pipeline, and the tail end of the discharge pipeline is provided with an air locking valve.
The present invention also provides a high density polyethylene drying system comprising:
the horizontal multi-chamber fluidized bed described above;
the first-section cyclone dust collector comprises a first-section input end, a first-section top output end and a first-section bottom output end, the first-section input end is communicated with the exhaust port of the first-section bed body, and the first-section bottom output end is communicated with the reclaimed material inlet of the second-section bed body;
the two-section cyclone dust collector comprises a two-section input end, a two-section top output end and a two-section bottom output end, the two-section input end is communicated with the exhaust port of the second section bed body, the two-section top output end is communicated with the air inlet at the bottom of the first section bed body, and the two-section bottom output end outputs products;
a scrubbing-and-cooling apparatus comprising an inlet end and an exhaust end, the inlet end being in communication with the section of the top output, an
And the carrier gas heater comprises a gas inlet and a gas outlet, the gas inlet is communicated with the exhaust end, and the gas outlet is communicated with the gas inlet at the bottom of the second section of bed body.
In the high density polyethylene drying system of the present invention, preferably, the scrubbing and cooling device is a scrubbing and cooling tower, the air inlet end and the air outlet end are respectively disposed at the lower part and the top part of the scrubbing and cooling tower,
the tower bottom of the washing cooling tower is connected with a solvent circulating pump, the solvent circulating pump is respectively communicated with a recovery pipeline, a circulating pipeline and a cooling pipeline, the circulating pipeline is communicated with the lower part of the washing cooling tower, and the cooling pipeline is sequentially communicated with a cooler and the upper part of the washing cooling tower.
In the high density polyethylene drying system according to the present invention, it is preferable that the cooler includes two or more coolers connected in series.
In the high density polyethylene drying system of the present invention, preferably, the first section bottom output end and the second section bottom output end are respectively provided with an air lock valve.
According to the high-density polyethylene drying system, preferably, the output end of the bottom of the two sections and the discharge port are both communicated with a discharge pipeline, and the tail end of the discharge pipeline is provided with an air locking valve.
In the high-density polyethylene drying system, preferably, a first-stage fan is arranged between the output end of the top of the second stage and the gas inlet, and a second-stage fan is arranged between the exhaust end and the gas inlet.
The high-density polyethylene drying system provided by the invention has the following purposes:
the horizontal multi-chamber fluidized bed is divided into two sections, each section is separated by a partition plate, and each section in the fluidized bed is provided with a plurality of groups of heat exchange pipes and a plurality of chambers, which are places for drying the high-density polyethylene;
the two cyclone dust collectors are used for gas-solid separation, and most of high-density polyethylene dust in the dry tail gas is captured;
the washing cooling tower is mainly used for washing dust and a hexane solvent carried in the dry tail gas, and is a place for countercurrent washing and heat exchange of the dry tail gas and the hexane solvent;
a carrier gas heater for heating the dry carrier gas;
two or more coolers for multi-stage cooling of the circulating solvent;
the three air locking valves are mainly used for conveying high-density polyethylene materials or products and preventing air from leaking into the system;
two fans for conveying dry tail gas and dry carrier gas;
and the solvent circulating pump is used for conveying the circulating solvent at the bottom of the tower.
The invention also provides a high-density polyethylene drying method based on the horizontal multi-chamber fluidized bed or the high-density polyethylene drying system, which comprises the following steps:
(1) primary drying: wet materials enter the first section of bed body and are fluidized under the action of drying carrier gas, in the process, a section of solvent steam generated by evaporation of a solvent in the wet materials, the section of solvent steam and part of polyethylene dust enter a section of cyclone dust collector along with a section of drying tail gas, and the wet materials stay in the first section of bed body to obtain primarily dried materials;
(2) deep drying: the primarily dried material enters the second section of bed body and is fluidized under the action of a drying carrier gas, in the process, the residual solvent in the material is further evaporated to generate second section solvent steam, the second section solvent steam and part of polyethylene dust enter a second section cyclone dust collector along with second section drying tail gas, and the primarily dried material stays in the second section of bed body to obtain a deeply dried material as a product;
(3) first-stage drying tail gas circulation: gas-solid separation is carried out in a first-stage cyclone dust collector to obtain a first-stage recovered material and a first-stage purified tail gas, the first-stage recovered material enters a second-stage bed body, the first-stage purified tail gas is washed and cooled, materials and solvents in the first-stage purified tail gas are removed, and recovered carrier gas is obtained and is used as dry carrier gas for recycling;
(4) and (3) secondary drying tail gas circulation: and (3) performing gas-solid separation in a two-stage cyclone dust collector to obtain a two-stage recovered material and a two-stage purified tail gas, wherein the two-stage recovered material is used as a product, and the two-stage purified tail gas is used as a drying carrier gas for recycling.
In the drying method of the high density polyethylene according to the present invention, preferably, in the step (3), the washing and cooling of the first-stage purified tail gas is performed in a washing cooling tower, and the method comprises the following steps:
(31) washing: the first section of purified tail gas enters the lower part of the washing cooling tower to be contacted with a circulating solvent in the washing cooling tower for washing;
(32) and (3) cooling: the washed first section of purified tail gas enters the upper part of the washing cooling tower, is cooled by the circulating solvent in the washing cooling tower and is discharged from the top of the washing cooling tower;
(33) solvent circulation: and after flowing into the tower bottom, the circulating solvent in the washing and cooling tower is divided into at least three parts, wherein the first part is recovered, the second part enters the lower part of the washing and cooling tower, and the third part enters the upper part of the washing and cooling tower after being cooled.
In the method for drying high-density polyethylene according to the present invention, it is preferable that the cooling in step (33) is two-stage or more cooling.
In the drying method of the high-density polyethylene, preferably, in the step (3), the recovered carrier gas is heated and then enters the second-stage bed body as a drying carrier gas; in the step (4), the second-stage purified tail gas is used as a dry carrier gas to enter the first-stage bed body.
The drying method of the high density polyethylene according to the present invention, wherein preferably,
in the step (1), wet materials enter the first-stage bed body and are uniformly distributed by a material distribution disc and then fluidized, the temperature of low-pressure steam is less than 120 ℃, the temperature of drying carrier gas is 90-100 ℃, the drying tail gas is cooled to 65-70 ℃, and the retention time is 8-15 seconds;
in the step (2), the temperature of the primarily dried material entering the second-stage bed body is 60-70 ℃, the temperature of the drying carrier gas is 90-100 ℃, the temperature of the second-stage drying tail gas is 90-100 ℃, the retention time is 8-15 seconds, and the material is heated to about 100 ℃.
The high-density polyethylene drying method adopts the horizontal multi-chamber fluidized bed to dry the high-density polyethylene, adopts nitrogen (inert gas) as a drying carrier gas, adopts low-pressure steam as a heat source, and adopts hexane as a circulating solvent.
The method of the invention adopts a horizontal multi-chamber fluidized bed to realize the drying of the material, and recovers the solvent and the heat in the tail gas generated in the drying process by the circulation, washing, cooling and other modes of the tail gas. Compared with the prior art, the invention mainly has the following advantages:
(1) the horizontal multi-chamber fluidized bed is a static device, the whole system is operated by micro-positive pressure, and drying carrier gas is circulated in a closed manner, so that compared with the original treatment process, the air quantity leaking into the system is reduced, and the safety of system operation is improved. Compared with the movable equipment of the original process, the bedroom multi-chamber fluidized bed has lower mechanical failure rate and improves the stability of system operation.
(2) The horizontal multi-chamber fluidized bed equipment has smaller specification and less occupied area, and reduces the investment of the equipment and the device.
(3) The horizontal multi-chamber fluidized bed generally belongs to one of pneumatic dryers, has short retention time of materials in the dryer, is particularly suitable for drying heat-sensitive materials, reduces the possibility of melting and caking of the materials, and improves the quality of products.
The invention relates to a processing method for drying high-density polyethylene and recovering a solvent, which is also suitable for drying and treating the solvent of related heat-sensitive substances in petrochemical, chemical and polyester industries and relates to the technical field of energy conservation and consumption reduction in industrial processes.
Drawings
FIG. 1 is a schematic structural view of a horizontal multi-chamber fluidized bed of the present invention.
Wherein the reference numerals are:
1. the device comprises a horizontal multi-chamber fluidized bed, 2, a first-stage cyclone dust collector, 3, a second-stage cyclone dust collector, 4, a washing cooling tower, 5, a solvent circulating pump, 6, a first-stage cooler, 7, a second-stage cooler, 8, a first-stage fan, 9, a second-stage fan, 10, a carrier gas heater, 11, a fluidized bed air locking valve, 12, a first-stage cyclone air locking valve, 13, a second-stage cyclone air locking valve, 14, a partition plate, 15, a discharge opening, 16, a steam pipeline, 17 and a heating pipe; 18. a steam condensate pipeline 19 and a discharge pipeline;
101. a first section of bed body 102, a second section of bed body 103, a chamber 104, a feed inlet 105, a gas distribution plate 106, a gas outlet 107, a reclaimed material inlet 108, a gas inlet 109 and a discharge outlet;
201. a section of input end 202, a section of top output end 203, a section of bottom output end;
301. a second section input end 302, a second section top output end 303 and a second section bottom output end;
401. an intake end, 402, an exhaust end;
501. a recovery line 502, a circulation line, a cooling line 503;
1001. a gas inlet 1002, a gas outlet;
1401. upper baffle 1402, lower baffle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, in a horizontal multi-chamber fluidized bed 1 of the present invention, the fluidized bed 1 is divided into a first section bed body 101 and a second section bed body 102 by a partition plate, the upper portions of the first section bed body 101 and the second section bed body 102 are respectively and independently provided with a plurality of groups of heating pipes 17, the air inlet of each group of heating pipes 17 is communicated with a steam pipeline 16, the liquid outlet of each group of heating pipes 17 is communicated with a steam condensate pipeline 18, the lower portions of the first section bed body 101 and the second section bed body 102 are respectively and independently provided with a plurality of chambers 103, and the top of each chamber is provided with a gas distribution plate 105;
the top of the first section of bed body 101 is provided with a feed inlet 104 and an exhaust port 106, and the bottom of the first section of bed body is provided with an air inlet 108 correspondingly communicated with the chamber 103;
the lower part of the clapboard is provided with a discharge opening 15;
the top of the second bed section 102 is provided with a reclaimed material inlet 107 and an exhaust port 106, the bottom of the second bed section 102 is provided with an air inlet 108 correspondingly communicated with the chamber 103, and the lower part of the second bed section 102 is provided with a discharge port 109.
In some embodiments, the partition 14 is composed of an upper partition 1401 and a lower partition 1402, and the discharge opening 15 is formed between the upper partition 1401 and the lower partition 1402.
In some embodiments, a material distribution plate (not shown) is disposed below the feed inlet 104.
In some embodiments, the discharge port 109 is connected to a discharge pipe 19, and the end of the discharge pipe 19 is provided with a gas lock valve, i.e. the fluidized bed gas lock valve 11.
Referring to fig. 1, the high density polyethylene drying system of the present invention comprises:
the horizontal multi-chamber fluidized bed described above;
the first-section cyclone dust collector 2 comprises a first-section input end 201, a first-section top output end 202 and a first-section bottom output end 203, the first-section input end is communicated with the exhaust port of the first-section bed body, and the first-section bottom output end is communicated with the reclaimed material inlet of the second-section bed body;
the secondary cyclone dust collector 3 comprises a secondary input end 301, a secondary top output end 302 and a secondary bottom output end 303, wherein the secondary input end 301 is communicated with the exhaust port 106 of the second bed 102, the secondary top output end 302 is communicated with the air inlet 108 at the bottom of the first bed 101, and the secondary bottom output end 303 outputs products;
the washing and cooling device comprises an air inlet end and an air outlet end, the air inlet end is communicated with the output end of the section of the top,
and the carrier gas heater 10 comprises a gas inlet 1001 and a gas outlet 1002, wherein the gas inlet 1001 is communicated with the exhaust end, and the gas outlet 1002 is communicated with the gas inlet 108 at the bottom of the second bed section 102.
In some embodiments, the scrub cooling apparatus is a scrub cooling tower 4, the air inlet end 401 and the air outlet end 402 are disposed at a lower portion and a top portion of the scrub cooling tower 4,
the tower bottom of the washing cooling tower 4 is connected with a solvent circulating pump 5, the solvent circulating pump 5 is respectively communicated with a recovery pipeline 501, a circulating pipeline 502 and a cooling pipeline 503, the circulating pipeline 502 is communicated with the lower part of the washing cooling tower 4, and the cooling pipeline 503 is sequentially communicated with a cooler and the upper part of the washing cooling tower 4.
In some embodiments, the cooler comprises more than two coolers connected in series.
In some embodiments, the first section bottom outlet 203 is provided with a first section cyclone trap 12, and the second section bottom outlet 303 is provided with a second section cyclone trap 13.
In some embodiments, the two-stage bottom output end 303 and the discharge port 109 are both communicated with a discharge pipe 19, and the end of the discharge pipe 19 is provided with a fluidized bed gas locking valve 11.
In some embodiments, a primary fan 8 is disposed between the secondary top outlet 302 and the inlet 108, and a secondary fan 9 is disposed between the exhaust 402 and the gas inlet 1001.
The high-density polyethylene drying method is based on the horizontal multi-chamber fluidized bed 1 or the high-density polyethylene drying system, and comprises the following steps:
(1) primary drying: wet materials enter the first section of bed body 101 and are fluidized under the action of drying carrier gas, in the process, a section of solvent steam generated by evaporation of a solvent in the wet materials, the section of solvent steam and part of polyethylene dust enter a section of cyclone dust collector 2 along with a section of drying tail gas, and the wet materials stay in the first section of bed body 101 to obtain primarily dried materials;
(2) deep drying: the primarily dried material enters the second section bed body 102 and is fluidized under the action of a drying carrier gas, in the process, the residual solvent in the material is further evaporated to generate second section solvent steam, the second section solvent steam and part of polyethylene dust enter the second section cyclone dust collector 3 along with second section drying tail gas, and the primarily dried material stays in the second section bed body 102 to obtain a deeply dried material as a product;
(3) first-stage drying tail gas circulation: gas-solid separation is carried out in a first-stage cyclone dust collector 2 to obtain a first-stage recovered material and a first-stage purified tail gas, the first-stage recovered material enters the second-stage bed body 102, and the first-stage purified tail gas is washed and cooled to remove materials and solvents in the first-stage purified tail gas to obtain a recovered carrier gas which is used as a dry carrier gas for recycling;
(4) and (3) secondary drying tail gas circulation: gas-solid separation is carried out in the two-stage cyclone dust collector 3 to obtain two-stage recovered materials and two-stage purified tail gas, the two-stage recovered materials are used as products, and the two-stage purified tail gas is used as dry carrier gas for recycling.
In some embodiments, in step (3), the washing and cooling of the primary purified tail gas is performed in a washing and cooling tower 4, comprising the steps of:
(31) washing: the first section of purified tail gas enters the lower part of the washing cooling tower 4 to be contacted and washed with the circulating solvent in the washing cooling tower;
(32) and (3) cooling: the washed first section of purified tail gas enters the upper part of the washing and cooling tower 4, is cooled by the circulating solvent in the washing and cooling tower 4 and is discharged from the top of the washing and cooling tower 4;
(33) solvent circulation: the circulating solvent in the washing and cooling tower 4 is divided into at least three parts after flowing into the bottom of the tower, wherein the first part is recovered, the second part enters the lower part of the washing and cooling tower 4, and the third part enters the upper part of the washing and cooling tower 4 after being cooled.
In some embodiments, in step (33), the cooling is more than two stages of cooling.
In some embodiments, in step (3), the recovered carrier gas is heated and then enters the second bed section 102 as a dry carrier gas; in the step (4), the second-stage purified tail gas is used as a dry carrier gas to enter the first-stage bed body 101.
In some embodiments, in the step (1), after entering the first bed 101, wet materials are uniformly distributed by a material distribution disc and then fluidized, the temperature of the low-pressure steam is less than 120 ℃, the temperature of the drying carrier gas is 90-100 ℃, the drying tail gas is cooled to 65-70 ℃, and the retention time is 8-15 seconds;
in the step (2), the temperature of the primarily dried material entering the second bed 102 is 60-70 ℃, the temperature of the drying carrier gas is 90-100 ℃, the temperature of the second-stage drying tail gas is 90-100 ℃, the retention time is 8-15 seconds, and the material is heated to about 100 ℃.
Example 1
Referring to fig. 1, a horizontal multi-chamber fluidized bed 1 has a two-stage structure, a partition plate 14 is used in the middle to separate two sections of the fluidized bed, a plurality of chambers 103 are respectively disposed at the lower portions of a first bed 101 and a second bed 102 (the number of the chambers 103 included in each bed can be adjusted according to the difference of the feeding amount and the material property), in this embodiment, the first bed 101 includes 7 chambers 103, the second bed 102 includes 5 chambers 103, and a plurality of groups of heating pipes 17 (the number of the heating pipes is adjusted according to the feeding amount) are respectively disposed at the upper portions of the first bed 101 and the second bed 102, in this embodiment, the first bed 101 includes 4 groups of heating pipes 17, the second bed 102 includes 3 groups of heating pipes 17, and low-pressure steam is introduced into the heating pipes 17 as a heating source (the.
The high-density polyethylene wet material from the upstream system enters the horizontal multi-chamber fluidized bed 1 from the feed inlet 104, and the materials are uniformly distributed under the action of a material distribution disc (not shown) in the horizontal multi-chamber fluidized bed 1 and then enter a first section of bed body 101, fluidizing under the action of drying carrier gas at about 95 ℃, wherein hexane in the materials is rapidly evaporated under the action of the drying carrier gas in the process, hexane solvent vapor generated by evaporation and part of polyethylene dust enter a first-section cyclone dust collector 2 along with the drying tail gas through an exhaust port 106 at the upper part of a first-section bed body 101, the drying tail gas is cooled to 65-70 ℃, the polyethylene materials stay in the first-section bed body 101 for about 8-15 seconds and enter a second-section bed body 102 through a discharge port 15, in the first section of drying process, the hexane content in the polyethylene is reduced to 3-5%, and the preliminary drying of the polyethylene material is realized.
b, the polyethylene material entering the second-stage bed body 102 is about 60-70 ℃ and is fluidized under the action of drying carrier gas at about 95 ℃, in the process, the residual hexane solvent in the material is further evaporated under the action of the drying carrier gas and the heating pipe 17, hexane steam and part of polyethylene dust generated by evaporation enter the two-stage cyclone dust collector 3 along with drying tail gas from the exhaust port 106 at the upper part of the second-stage bed body 102, the temperature of the drying tail gas is about 95 ℃, the polyethylene material stays in the second-stage bed body 102 for about 8-15 seconds, the polyethylene material is heated to about 100 ℃, and enters a subsequent system through the discharge port 109 and the fluidized bed air locking valve 11, and in the second-stage drying process, the hexane content in the polyethylene is further reduced to about 0.1%, so that the deep drying of the polyethylene material is realized.
c, performing gas-solid separation on the dried tail gas at about 60-70 ℃ from the first bed body 101 of the horizontal multi-chamber fluidized bed 1 under the action of the first-stage cyclone dust collector 2, separating most of dust carried in the tail gas, enabling the separated dried tail gas to enter the second-stage bed body 102 through the first-stage cyclone air-lock valve 12, enabling the purified dried tail gas to enter from a gas inlet end 401 at the lower part of the washing and cooling tower 4, enabling the purified dried tail gas to be in countercurrent contact with a hexane solvent at about 40-50 ℃ for washing, and washing most of dust in the dried tail gas; the dried tail gas after washing and dust removal enters the upper part of a washing and cooling tower 4, the dried tail gas and a hexane solvent at about 30 ℃ are subjected to countercurrent contact cooling, most of hexane steam carried in the dried tail gas is condensed, the cooled dried tail gas at about 35 ℃ is discharged from an exhaust end 402 at the top of the washing and cooling tower and enters a carrier gas heater 10 under the action of a second-stage fan 9, indirect heat exchange is carried out between the dried tail gas and low-pressure steam, and the dried tail gas is heated to about 95 ℃ and enters a second-stage bed body 102 to be used as a dried carrier gas.
During the circulation of the carrier gas, in order to maintain the pressure balance and the micro-positive pressure operation of the system, a part of fresh nitrogen is supplemented at the top of the washing cooling tower 4, and a part of dry tail gas is discharged at the outlet of the secondary fan 9.
d, the dry tail gas at about 95 ℃ from the second-stage bed body 102 is subjected to gas-solid separation under the action of the second-stage cyclone dust collector 3, most of dust carried in the tail gas is separated and enters the discharge pipeline 19 through the second-stage cyclone air-lock valve 13, and the purified second-stage dry tail gas enters the first-stage bed body 101 under the action of the first-stage fan 8 to be used as dry carrier gas.
e, enabling a hexane circulating solvent at the temperature of 40-50 ℃ to enter a solvent circulating pump 5 from the bottom of the washing cooling tower 4, and dividing the hexane circulating solvent into three parts under the action of a pump: a part of hexane solvent enters a subsequent system to realize the recovery of the hexane solvent in the material; a part of hexane circulating solvent directly enters the lower part of the washing cooling tower 4 to be used as a solvent for dedusting dry tail gas; a part of the hexane solvent firstly enters the primary cooler 6, the hexane solvent is subjected to indirect heat exchange with a cooling cycle, the hexane solvent is cooled to about 35 ℃, then enters the secondary cooler 7 and is subjected to indirect heat exchange with chilled water, the hexane solvent is further cooled to about 30 ℃, and then enters the upper part of the washing and cooling tower 4 to be used as a cooling solvent of the dry tail gas.
It should be noted that the above preferred embodiments are only for illustrating the present invention, but the present invention is not limited to the above embodiments, and variations and modifications within the spirit of the present invention, which are made by those skilled in the art, are included in the protection scope of the present invention.
Claims (15)
1. The horizontal multi-chamber fluidized bed is characterized in that the fluidized bed is divided into a first section bed body and a second section bed body by a partition plate, a plurality of groups of heating pipes are respectively and independently arranged on the upper parts of the first section bed body and the second section bed body, the air inlet of each group of heating pipes is communicated with a steam pipeline, the liquid outlet of each group of heating pipes is communicated with a steam condensate pipeline, a plurality of chambers are respectively and independently arranged on the lower parts of the first section bed body and the second section bed body, and the top of each chamber is provided with a gas distribution plate;
the top of the first section of bed body is provided with a feed inlet and an exhaust port, and the bottom of the first section of bed body is provided with an air inlet correspondingly communicated with the chamber;
the lower part of the clapboard is provided with a discharge opening;
the top of the second section of bed body is equipped with reclaimed material import and gas vent, the bottom of the second section of bed body is equipped with rather than the air inlet that the cavity corresponds the intercommunication, the lower part of the second section of bed body is equipped with the discharge gate.
2. The horizontal multi-chambered fluidized bed of claim 1, wherein the partition consists of an upper partition and a lower partition, between which the discharge opening is located.
3. The horizontal multi-chambered fluidized bed of claim 1, wherein a material distribution plate is provided below the feed inlet.
4. The horizontal multi-chamber fluidized bed according to claim 1, wherein a discharge pipe is connected to the discharge port, and a gas lock valve is arranged at the end of the discharge pipe.
5. High density polyethylene drying system, characterized in that includes:
a horizontal multi-chamber fluidized bed according to claim 1;
the first-section cyclone dust collector comprises a first-section input end, a first-section top output end and a first-section bottom output end, the first-section input end is communicated with the exhaust port of the first-section bed body, and the first-section bottom output end is communicated with the reclaimed material inlet of the second-section bed body;
the two-section cyclone dust collector comprises a two-section input end, a two-section top output end and a two-section bottom output end, the two-section input end is communicated with the exhaust port of the second section bed body, the two-section top output end is communicated with the air inlet at the bottom of the first section bed body, and the two-section bottom output end outputs products;
a scrubbing-and-cooling apparatus comprising an inlet end and an exhaust end, the inlet end being in communication with the section of the top output, an
And the carrier gas heater comprises a gas inlet and a gas outlet, the gas inlet is communicated with the exhaust end, and the gas outlet is communicated with the gas inlet at the bottom of the second section of bed body.
6. The high density polyethylene drying system of claim 5, wherein the scrubbing cooling device is a scrubbing cooling tower, the gas inlet end and the gas outlet end are disposed at a lower portion and a top portion of the scrubbing cooling tower, respectively,
the tower bottom of the washing cooling tower is connected with a solvent circulating pump, the solvent circulating pump is respectively communicated with a recovery pipeline, a circulating pipeline and a cooling pipeline, the circulating pipeline is communicated with the lower part of the washing cooling tower, and the cooling pipeline is sequentially communicated with a cooler and the upper part of the washing cooling tower.
7. The high density polyethylene drying system of claim 6, wherein the cooler comprises more than two coolers connected in series.
8. The system of claim 5, wherein the first section of the bottom outlet and the second section of the bottom outlet are each provided with a gas lock valve.
9. The high-density polyethylene drying system according to claim 5, wherein the output end of the bottom of the two sections and the discharge port are both communicated with a discharge pipeline, and the tail end of the discharge pipeline is provided with an air locking valve.
10. The system of claim 5, wherein a first fan is disposed between the second top outlet and the gas inlet, and a second fan is disposed between the gas outlet and the gas inlet.
11. The high density polyethylene drying method based on the horizontal multi-chamber fluidized bed of claim 1 or the high density polyethylene drying system of claim 5, comprising the steps of:
(1) primary drying: wet materials enter the first section of bed body and are fluidized under the action of drying carrier gas, in the process, a section of solvent steam generated by evaporation of a solvent in the wet materials, the section of solvent steam and part of polyethylene dust enter a section of cyclone dust collector along with a section of drying tail gas, and the wet materials stay in the first section of bed body to obtain primarily dried materials;
(2) deep drying: the primarily dried material enters the second section of bed body and is fluidized under the action of a drying carrier gas, in the process, the residual solvent in the material is further evaporated to generate second section solvent steam, the second section solvent steam and part of polyethylene dust enter a second section cyclone dust collector along with second section drying tail gas, and the primarily dried material stays in the second section of bed body to obtain a deeply dried material as a product;
(3) first-stage drying tail gas circulation: gas-solid separation is carried out in a first-stage cyclone dust collector to obtain a first-stage recovered material and a first-stage purified tail gas, the first-stage recovered material enters a second-stage bed body, the first-stage purified tail gas is washed and cooled, materials and solvents in the first-stage purified tail gas are removed, and recovered carrier gas is obtained and is used as dry carrier gas for recycling;
(4) and (3) secondary drying tail gas circulation: and (3) performing gas-solid separation in a two-stage cyclone dust collector to obtain a two-stage recovered material and a two-stage purified tail gas, wherein the two-stage recovered material is used as a product, and the two-stage purified tail gas is used as a drying carrier gas for recycling.
12. The drying method of high-density polyethylene according to claim 11, wherein in the step (3), the washing and cooling of the first-stage purified tail gas is performed in a washing cooling tower, and the method comprises the following steps:
(31) washing: the first section of purified tail gas enters the lower part of the washing cooling tower to be contacted with a circulating solvent in the washing cooling tower for washing;
(32) and (3) cooling: the washed first section of purified tail gas enters the upper part of the washing cooling tower, is cooled by the circulating solvent in the washing cooling tower and is discharged from the top of the washing cooling tower;
(33) solvent circulation: and after flowing into the tower bottom, the circulating solvent in the washing and cooling tower is divided into at least three parts, wherein the first part is recovered, the second part enters the lower part of the washing and cooling tower, and the third part enters the upper part of the washing and cooling tower after being cooled.
13. The method for drying high-density polyethylene according to claim 11, wherein in the step (33), the cooling is more than two-stage cooling.
14. The method for drying high density polyethylene according to claim 11,
in the step (3), the recovered carrier gas is heated and then enters the second section of bed body as a dry carrier gas; in the step (4), the second-stage purified tail gas is used as a dry carrier gas to enter the first-stage bed body.
15. The method for drying high density polyethylene according to claim 11,
in the step (1), wet materials enter the first-stage bed body and are uniformly distributed by a material distribution disc and then fluidized, the temperature of low-pressure steam is less than 120 ℃, the temperature of drying carrier gas is 90-100 ℃, the drying tail gas is cooled to 65-70 ℃, and the retention time is 8-15 seconds;
in the step (2), the temperature of the primarily dried material entering the second-stage bed body is 60-70 ℃, the temperature of the drying carrier gas is 90-100 ℃, the temperature of the second-stage drying tail gas is 90-100 ℃, the retention time is 8-15 seconds, and the material is heated to about 100 ℃.
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