CN102603937B - Flash drying and internal heated fluidized bed drying system and process special for chlorinated polyethylene - Google Patents

Flash drying and internal heated fluidized bed drying system and process special for chlorinated polyethylene Download PDF

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Publication number
CN102603937B
CN102603937B CN201210101329.8A CN201210101329A CN102603937B CN 102603937 B CN102603937 B CN 102603937B CN 201210101329 A CN201210101329 A CN 201210101329A CN 102603937 B CN102603937 B CN 102603937B
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drying
fluidized bed
air
internal heating
flash
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CN201210101329.8A
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CN102603937A (en
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苗帅
蒋斌
董先华
梁国林
杨志刚
贾世阳
董桂霖
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山东科院天力节能工程有限公司
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    • 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
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Abstract

The invention provides a flash drying and internal heated fluidized bed drying system and process special for chlorinated polyethylene. Chlorinated polyethylene with the humidity ratio more than 30-55% is dried to form a finished product with the humidity ratio less than 0.3% through first-stage flash drying and second-stage internal heated fluidized bed drying by taking hot air as drying medium. High-temperature air is used for drying surface water in the flash drying process, and multistage different-temperature inlet air is used for fluidizing materials in the internal heated fluidized bed drying process so that the materials are deeply dried. The drying heat is mainly provided by a heat exchange tube in the fluidized bed, so that hot water and the materials directly exchange heat, and the air quantity of the system and the steam consumption are greatly reduced; and meanwhile, the hot water is from low-grade reaction heat in a prior-period process, so that the energy source of the system is optimized, and the operation expense of the system is remarkably reduced. The drying system for the chlorinated polyethylene has the advantages of continuous operation from feeding to discharging, no manual operation, reduction of labor intensity of workers, stable temperature of the fluidized bed and high thermal efficiency. Meanwhile, after the system operates normally, the retention periods of the materials in the bed are basically consistent, the water content of a product is low and stable, and large-scale production is realized.

Description

The special-purpose expansion drying of chlorinatedpolyethylene adds internal heating fluidized bed dehumidification system and technique

Technical field

The present invention is a kind of chlorinatedpolyethylene dry technology, and the special-purpose expansion drying of a kind of chlorinatedpolyethylene adds internal heating fluidized bed dehumidification system and technique specifically.

Background technology

We know, chlorinatedpolyethylene is used warm air as drying medium, the existing general air-flow that uses adds common fluid bed drying process at present, this technique is that Chinese patent 200610045528.6 discloses a kind of chlorinated polyethylene drying process, it has solved in existing drying process and all will experience heating and cooling process one time, energy wastage is serious, and intermittent type fluidized-bed output is little, can not maximize, labor strength is large, the problems such as the easy fluctuation of product water content, its process using warm air is as drying medium, add the secondary fluidised bed drying by the one-level pulsed pneumatic drying, moisture content is greater than to 30%~55% chlorinatedpolyethylene is dry is less than 0.3% finished product for moisture content.Air stream drying is used high temperature air to carry out surface water rapid drying, and fluidized-bed carries out depth drying to material.This system does not have running gear, equipment is used and keeps in repair easy, system failure rate is low, safe and reliable, realizes carrying out continuously, centre does not have personnel to operate, reduced labor strength, fluidized-bed bed temperature-stable, thermo-efficiency is high, material residence time in bed is basically identical, and the product water content is low and stable.

But there is certain deficiency in this patent: former invention has only solved the continuous and automatic problem of producing, and less to capacity usage ratio and production cost consideration, original system also exists can not process whizzer bonded particulate material out, and use range is under some influence.Details are as follows: one-level is used pneumatic drier, the movement velocity of material in drying machine be 20 meter per seconds approximately, general about one second of the residence time, time is short, material can not be fully dry, and pneumatic drier does not have mechanical stirring device simultaneously, if wet stock viscosity is large or have particle to exist, easily at the air stream drying motor spindle, produce buildup, affect the quality of equipment operation and product.The drying process of the common fluidized-bed of secondary, common fluidized-bed belongs to indirect heat exchange equipment, need at first heat hot blast, and then hot blast is at the heat drying material, so the air capacity needed is large, cause occupation area of equipment large, treatment capacity is little, and air quantity is large, the tail gas heat quantity loss is serious, the large sizable shortcoming of the power consumption of whole system and steam consumption quantity, cause the energy consumption of dehumidification system to account for 75% left and right in the production technique of whole chlorinatedpolyethylene, seriously increased production cost.

Goal of the invention

The present invention is for overcoming above-mentioned the deficiencies in the prior art, provide the special-purpose expansion drying of a kind of chlorinatedpolyethylene to add internal heating fluidized bed dehumidification system and technique, its one-level adopts flash dryer, introduce mechanical stirring device, can, by the lumpy material fragmentation, reduce the travelling speed in drying machine of material simultaneously, significantly extend the time of drying of material, improve capacity usage ratio high, the adaptability of wet stock has been increased substantially, can process the viscosity lumpy material.Secondary is introduced built-in heat exchanger, and the required amount of heat of dry materials is provided by built-in heat exchanger, and air only plays goods fluid and the effect of the heat of small part is provided.Greatly reduce the equipment drying area, reduced air capacity, the change indirect heat exchange is direct heat exchange.Simultaneously, the thermal source of built-in heat exchanger can be used the reaction heat produced when early stage, process stream reacted, and has integrated the heat balance of whole production system, need to not increase new heat.So the invention provides the special-purpose internal heating fluidized bed drying technology of reliable and stable chlorinatedpolyethylene, greatly saved power consumption and steam consumption quantity, working cost is low, has improved the device processes amount, simultaneously can process the high-quality product of high viscosity, than original system energy efficient more than 30%.As in the industry promotion conference, the production cost of whole industry had to larger reduction.Regeneration product for the polyvinyl chloride dry drying system.

For achieving the above object, the present invention adopts following technical scheme:

The special-purpose expansion drying of a kind of chlorinatedpolyethylene adds internal heating fluidized bed dehumidification system, it take steam and hot water is thermal source, comprise the two-stage drying, first step drying comprises the heat exchange of flash evaporation device, heat exchange of flash evaporation device blast inlet and air communication, air outlet is connected with the flash drum blower fan, and the heat exchange of flash evaporation device also is connected with steam source; The flash drum blower fan is connected with flash dryer, and flash dryer inside is provided with whipping appts; Wet stock is connected with flash dryer by e Foerderanlage; The material outlet of flash dryer is connected with dust removal installation I, and the discharge port of dust removal installation I is connected with the internal heating fluidized bed opening for feed with built-in heat exchanger of second stage drying; The tail gas relief outlet of dust removal installation I is connected with the flash distillation induced draft fan;

Second stage drying also comprises vapor heat exchanger except internal heating fluidized bed, and air is sent into the vapor heat exchanger blast inlet through the fluidized-bed gas blower, and the vapor heat exchanger air outlet is connected with the blast inlet of internal heating fluidized bed bottom air compartment; Internal heating fluidized bed overflow port is connected with air-transport system, and the exhaust outlet on internal heating fluidized bed top is connected with dust removal installation II, and dust removal installation II is connected with induced draft fan.

Described e Foerderanlage is the screw feeding auger.

Described dust removal installation I is cyclonic separator I, and dust removal installation II is cyclonic separator II.

The discharge port of described cyclonic separator I is provided with star-like dumper.

Match with air compartment in described internal heating fluidized bed bottom is provided with air distribution plate; Internal heating fluidized bed built-in heat exchanger water-in is connected with hot water simultaneously, and water outlet is connected with circulation line.

The internal heating fluidized bed charging opening place of described secondary drying does not arrange built-in heat exchanger.

A kind of drying process that adopts the special-purpose expansion drying of chlorinatedpolyethylene to add internal heating fluidized bed dehumidification system, it take steam and hot water is thermal source, carries out the two-stage drying, drying process is:

1) one-level drying: wet material adds flash dryer by the screw feeding auger, and dry air enters flash dryer after heating by the heat exchange of flash evaporation device; In flash dryer, material fully contacts with high temperature air, material completes the drying of surface water in flash dryer, simultaneously, part macrobead viscous material is broken up by the mechanical agitating vane in flash dryer, avoided materials from bonding, also increased the drying efficiency of material, dried material enters internal heating fluidized bed drying machine by cyclonic separator I through star-like dumper and carries out secondary drying simultaneously, and tail gas is emptying by evacuated tube after the pressurization of flash distillation induced draft fan;

2) secondary drying: the material after primary pre-drying is joined in internal heating fluidized bed drying machine by star-like discharging; Air enters vapor heat exchanger after sucking pressurization by the fluidized-bed gas blower, and the air after heating is sent into internal heating fluidized bed drying machine; Material and warm air and the internal heating fluidized bed interior hot water of interchanger carry out heat exchange, complete drying process under the dual function of hot blast and hot water, thereby the change indirect heat exchange is direct heat exchange, has improved capacity usage ratio, reduced power consumption and the steam consumption quantity of system; Dried material is discharged through the overflow port of fluidized-bed, enters air-transport system, and the tail gas of discharging from the fluidized-bed top is emptying after tornado dust collector II purifies.

Air after a described heating minute multichannel enters internal heating fluidized bed drying machine bottom air compartment, then enters bed through air distribution plate; The air that enters bed in this process is effectively controlled, thereby makes an interior material maintain stable fluidization.

Described built-in heat exchanger hot water source is process system waste heat in early stage, no longer increases new heat, balance the production system heat, be beneficial to energy-conservation.

The invention has the beneficial effects as follows:

1. the internal heating fluidized bed dehumidification system of chlorinatedpolyethylene has improved capacity usage ratio, because the use drying of fluidized-bed built-in heat exchanger is direct heat exchange by indirect heat exchange, most of heat is brought into thus, greatly improved equipment monomer output, reduced occupation area of equipment, realized the scale operation of drying polyvinyl chloride, realized the maximization of drying polyvinyl chloride device, the efficiency of former polyvinyl chloride dry drying system has been had and increased substantially.

2. according to the drying property of chlorinatedpolyethylene, one-level adopts expansion drying, reduced gas velocity, increased the time of drying of material and high temperature air, be more conducive to the removing of surface water of chlorinatedpolyethylene, flash dryer adopts mechanical stirring to strengthen the dry tenacity of material, and material is kept in motion, be difficult for bonding, improved system operation reliability, and product type that can the larger Functionality, quality and appealing design of production viscosity.

3. secondary drying adopts the internal heating fluidized bed deep dehydration that carries out, the large section of heat requirement of the dry institute of chlorinatedpolyethylene is provided by built-in heat exchanger, hot blast is brought the small portion heat into and is provided material normal fluidisation Air Quantity Required, greatly reduced the system Air Quantity Required, the minimizing of systematic air flow brings following favourable condition: at first, reduced the air quantity of blower fan.Reduce the power of blower fan, reduced the power consumption of system.Secondly, dust-removal system reduces greatly, has reduced facility investment, has improved the feature of environmental protection of system, and system tail gas amount reduces greatly again, has reduced the power loss caused because of exhaust emissions.Due to above reason, make native system greatly save on power consumption and steam consumption quantity than original system, reduced running cost, reduced energy expenditure more than 30%.

4. the hot water of built-in heat exchanger is used institute's liberated heat in production process mid-early stage chloridization process, has realized the low-grade exhaust heat utilization, balance the heat of whole production technique, more be beneficial to energy-conservation.

5. system adopts the segmentation air intake, and the choose reasonable inlet temperature, divide the multistage air intake according to the difference of material dewatering degree, both improved thermo-efficiency, avoids material overtemperature sex change in bed.

6. equipment adopts and destatics measure, and each equipment is carried out electrostatic grounding, and the place simultaneously needed in system passes into direct current, eliminates static, and glutinous pipe reduces heat exchange efficiency because static focus produces to avoid chlorinatedpolyethylene.

7. the equipment feed end is not arranged interchanger, has reduced the bonding of wet stock to built-in heat exchanger.

The accompanying drawing explanation

Fig. 1 is technical process of the present invention.

In Fig. 1,1, the heat exchange of flash evaporation device, 2, the screw feeding auger, 3, flash drum blower fan, 4, flash dryer, 5, cyclonic separator I, 6, the flash distillation induced draft fan, 7, fluidized-bed gas blower, 8, vapor heat exchanger, 9, internal heating fluidized bed drying machine, 10, cyclonic separator II, 11, star-like dumper, 12, induced draft fan.

Embodiment

Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.

In Fig. 1, comprise the two-stage drying, wherein first step drying plant comprises: heat exchange of flash evaporation device 1, and air, after heat exchange of flash evaporation device 1 is heated to be warm air, is sent into flash dryer 4 by flash drum blower fan 3, be provided with whipping appts in flash dryer 4, whipping appts is inside arranged, can process the bulk viscous material, improved product quality, increase the residence time of material, reduced the water ratio of material after elementary drying; Wet stock is sent into flash dryer 4 by screw feeding auger 2, the discharge gate of flash dryer 4 is connected with cyclonic separator I, the interior material of flash dryer 4 with high temperature air fully contact, material completes the drying of surface water in flash dryer 4, simultaneously, part macrobead viscous material is broken up by the mechanical agitating vane in drying machine, has avoided materials from bonding, has also increased the drying efficiency of material simultaneously; Dried material is collected and is entered the internal heating fluidized bed drying machine 9 with built-in heat exchanger through star-like dumper 11 by cyclonic separator I5, and tail gas is emptying by evacuated tube after 6 pressurizations of flash distillation induced draft fan.

Second stage drying: air is sent into vapor heat exchanger 8 through fluidized-bed gas blower 7, and vapor heat exchanger 8 is connected with the air compartment of internal heating fluidized bed drying machine 9 bottoms, and then enters bed through air distribution plate.The interchanger of internal heating fluidized bed drying machine 9 is connected with hot-water line, by interchanger and material, carries out heat exchange.Dried material is sent into air-transport system from the overflow port of internal heating fluidized bed drying machine 9, and the tail gas of discharging from internal heating fluidized bed drying machine 9 tops is emptying after cyclonic separator II10 purification, induced draft fan 12.

Internal heating fluidized bed drying machine 9 can adopt the internal heating fluidized bed drying machine of pipe embedded typ, built-in heat exchanger is built-in heat transfer tube, each heat transfer tube adopts the pipe embedded typ mode to be arranged in fluid bed dryer, use built-in heat exchanger, the change indirect heat exchange is direct heat exchange, improve capacity usage ratio, reduced power consumption and the steam consumption quantity of system.The built-in heat exchanger water-in is connected with hot water, and water outlet is connected with circulation line.

The internal heating fluidized bed charging opening place of secondary drying does not arrange built-in heat exchanger, has reduced the possibility of wet stock bonding interchanger, has improved system run all right.

Drying process of the present invention adopts the two-stage drying, and thermal source adopts hot water and steam.

The one-level drying: wet material adds flash dryer 3 by screw feeding auger 2, dry air enters flash dryer 4 after heating by heat exchange of flash evaporation device 1, the interior material of flash dryer 4 with high temperature air fully contact, material completes the drying of surface water in flash dryer 4, simultaneously, part macrobead viscous material is broken up by the mechanical agitating vane in drying machine, has avoided materials from bonding, has also increased the drying efficiency of material simultaneously; Dried material is collected and is entered internal heating fluidized bed drying machine 9 through star-like dumper 11 by cyclonic separator I5 dedusting, and tail gas is emptying by evacuated tube after 6 pressurizations of flash distillation induced draft fan.

Secondary drying: the material after primary pre-drying is joined in internal heating fluidized bed drying machine 9 through elephant trunk by star-like dumper 11.Air enters vapor heat exchanger 8 after sucking pressurization by fluidized-bed gas blower 7, and minute multichannel of the air after heating enters internal heating fluidized bed drying machine 9 bottom air compartments, then enters bed through air distribution plate.The air that enters bed in this process is effectively controlled, thereby makes an interior material maintain stable fluidization, and material and hot water carry out heat exchange by the interchanger in bed, under the dual function of hot blast and hot water, complete drying process.Dry material is discharged through the overflow port of internal heating fluidized bed drying machine 9, enters air-transport system, and the tail gas of discharging from internal heating fluidized bed drying machine 9 tops is emptying by flash distillation induced draft fan 6 after cyclonic separator II10 fly-ash separator purifies.In internal heating fluidized bed drying machine 9 drying processs, most dry heat is provided by built-in heat exchanger, and hot water, at the built-in heat exchanger internal recycle, passes to material to heat by built-in heat exchanger used for transpiring moisture.Air only makes goods fluid and the small part heat is provided.The built-in heat exchanger hot water source is process system waste heat in early stage, no longer increases new heat, balance the production system heat, be beneficial to energy-conservationly, capacity usage ratio improves 30%.

Claims (9)

1. the special-purpose expansion drying of chlorinatedpolyethylene adds internal heating fluidized bed dehumidification system, it take steam and hot water is thermal source, comprise at least two-stage drying, it is characterized in that, first step drying comprises the heat exchange of flash evaporation device, heat exchange of flash evaporation device blast inlet and air communication, air outlet is connected with the flash drum blower fan, and the heat exchange of flash evaporation device also is connected with steam source; The flash drum blower fan is connected with flash dryer, is provided with whipping appts in flash dryer; Wet stock is connected with flash dryer by e Foerderanlage; The material outlet of flash dryer is connected with dust removal installation I, and the discharge port of dust removal installation I is connected with the internal heating fluidized bed opening for feed with built-in heat exchanger of second stage drying; The tail gas relief outlet of dust removal installation I is connected with the flash distillation induced draft fan;
Second stage drying also comprises vapor heat exchanger except internal heating fluidized bed, and air is sent into the vapor heat exchanger blast inlet through the fluidized-bed gas blower, and the vapor heat exchanger air outlet is connected with the blast inlet of internal heating fluidized bed bottom air compartment; Internal heating fluidized bed overflow port is connected with air-transport system, and the exhaust outlet on internal heating fluidized bed top is connected with dust removal installation II, and dust removal installation II is connected with induced draft fan.
2. the special-purpose expansion drying of chlorinatedpolyethylene as claimed in claim 1 adds internal heating fluidized bed dehumidification system, it is characterized in that, described e Foerderanlage is the screw feeding auger.
3. the special-purpose expansion drying of chlorinatedpolyethylene as claimed in claim 1 adds internal heating fluidized bed dehumidification system, it is characterized in that, described dust removal installation I is cyclonic separator I, and dust removal installation II is cyclonic separator II.
4. the special-purpose expansion drying of chlorinatedpolyethylene as claimed in claim 3 adds internal heating fluidized bed dehumidification system, it is characterized in that, the discharge port of described cyclonic separator I is provided with star-like dumper.
5. the special-purpose expansion drying of chlorinatedpolyethylene as claimed in claim 1 adds internal heating fluidized bed dehumidification system, it is characterized in that, match with air compartment in described internal heating fluidized bed bottom is provided with air distribution plate; Internal heating fluidized bed built-in heat exchanger water-in is connected with hot water simultaneously, and water outlet is connected with circulation line.
6. the special-purpose expansion drying of chlorinatedpolyethylene as claimed in claim 1 adds internal heating fluidized bed dehumidification system, it is characterized in that, the internal heating fluidized bed charging opening place of described secondary drying does not arrange built-in heat exchanger.
7. a drying process that adopts the special-purpose expansion drying of the described chlorinatedpolyethylene of claim 1-6 any one to add internal heating fluidized bed dehumidification system, it take steam and hot water is thermal source, carries out the two-stage drying, it is characterized in that, drying process is:
1) one-level drying: wet material adds flash dryer by the screw feeding auger, and dry air enters flash dryer after heating by the heat exchange of flash evaporation device; In flash dryer, material fully contacts with high temperature air, material completes the drying of surface water in flash dryer, and simultaneously, part macrobead viscous material is broken up by the mechanical agitating vane in drying machine, avoid materials from bonding, also increased the drying efficiency of material simultaneously; Dried material enters internal heating fluidized bed drying machine by cyclonic separator I through star-like dumper and carries out secondary drying, and tail gas is emptying by evacuated tube after the pressurization of flash distillation induced draft fan;
2) secondary drying: the material after primary pre-drying is joined in internal heating fluidized bed drying machine by star-like discharging; Air enters vapor heat exchanger after sucking pressurization by the fluidized-bed gas blower, and the air after heating is sent into internal heating fluidized bed drying machine; Material and warm air and the internal heating fluidized bed interior hot water of built-in heat exchanger carry out heat exchange, complete drying process under the dual function of hot blast and hot water, thereby the change indirect heat exchange is direct heat exchange, has improved capacity usage ratio, reduced power consumption and the steam consumption quantity of system; Dried material is discharged through the overflow port of fluidized-bed, enters air-transport system, and the tail gas of discharging from the fluidized-bed top is emptying after tornado dust collector II purifies.
8. drying process as claimed in claim 7, is characterized in that, minute multichannel of the air after described heating enters internal heating fluidized bed drying machine bottom air compartment, then enters bed through air distribution plate; The air that enters bed in this process is effectively controlled, thereby makes an interior material maintain stable fluidization.
9. drying process as claimed in claim 7, is characterized in that, described built-in heat exchanger hot water source is process system waste heat in early stage, no longer increases new heat, balance the production system heat, be beneficial to energy-conservation.
CN201210101329.8A 2012-04-09 2012-04-09 Flash drying and internal heated fluidized bed drying system and process special for chlorinated polyethylene CN102603937B (en)

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CN103512313B (en) * 2013-07-18 2015-07-29 浙江大学 A kind of combined type moist material fluid bed superheat steam drying system
CN104397156A (en) * 2014-11-14 2015-03-11 天津麦世科尔科技咨询有限公司 Grain drying device capable of clearing away grain chip
CN105169727B (en) * 2015-09-09 2017-04-12 陕西科技大学 Evaporation and concentration system and process for diluted hydrochloric acid generated by production of chlorinated polyethylene
CN107655311B (en) * 2017-10-17 2019-06-18 太仓塑料助剂厂有限公司 The drying device and method of haloflex
CN108955093A (en) * 2018-08-08 2018-12-07 济南岳丰能源科技有限公司 A kind of impact modifier drying system and technique
CN109028768B (en) * 2018-08-08 2020-09-25 济南岳丰能源科技有限公司 Drying system and process for chlorinated polyvinyl chloride resin
CN109384862A (en) * 2018-10-25 2019-02-26 山东高信化学股份有限公司 A kind of production method of chlorinated polyvinyl chloride resin
CN109605631A (en) * 2018-12-12 2019-04-12 中国石油化工股份有限公司 A kind of energy-saving rubber fluidisation blade integrated dry drying system

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CN100400996C (en) * 2006-07-19 2008-07-09 山东天力干燥设备有限公司 Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology
CN100443509C (en) * 2006-07-19 2008-12-17 山东天力干燥设备有限公司 Chlorinated polyethylene drying process

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