CN103822454B - Based on wet dregs of rice drying system and the drying process of mechanical steam recompression - Google Patents

Based on wet dregs of rice drying system and the drying process of mechanical steam recompression Download PDF

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Publication number
CN103822454B
CN103822454B CN201410074418.7A CN201410074418A CN103822454B CN 103822454 B CN103822454 B CN 103822454B CN 201410074418 A CN201410074418 A CN 201410074418A CN 103822454 B CN103822454 B CN 103822454B
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steam
superheated steam
rotary dryer
storage tank
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CN103822454A (en
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耿文广
高玲
李选友
马秀力
汪双凤
员冬玲
蔡中盼
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Tianli Energy-Saving Engineering Co Ltdof Shandong Academy Of Sciences
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Tianli Energy-Saving Engineering Co Ltdof Shandong Academy Of Sciences
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Abstract

The invention discloses a kind of wet dregs of rice drying system based on mechanical steam recompression, comprise digester, digester discharging opening is communicated with feed opening of press filter, filter press discharging opening is communicated with superheated steam rotary dryer, superheated steam rotary dryer indirect steam outlet communicates with Mechanical Vapor Compression air entry, Mechanical Vapor Compression gas outlet is communicated with the inner heating tube bundle of superheated steam rotary dryer, superheated steam rotary dryer is provided with steam inlet, superheated steam rotary dryer is also provided with the condensation-water drain communicated with the first storage tank, superheated steam rotary dryer discharging opening is communicated to hot air fluidized bed dryer, first storage tank communicates with the heating tube in hot air fluidized bed dryer, hot air fluidized bed dryer liquid outlet is communicated to the second storage tank, second storage tank liquid outlet is communicated to digester inlet.The invention also discloses the technique utilizing this system.Energy consumption for drying of the present invention is low, equipment reclaims without the need to a large amount of water quench without dead angle, alcoholic solution.

Description

Based on wet dregs of rice drying system and the drying process of mechanical steam recompression
Technical field
The present invention relates to a kind of wet dregs of rice precipitation drying system and technique, belong to the dry technology of albumen powder, especially a kind of wet dregs of rice drying system based on mechanical steam recompression and drying process.
Background technology
FSPC is the natural additive for foodstuff of high-quality, and it take low temperature soy meal as raw material, and there are lixiviate, precipitation, ultramicro grinding, Functional Conversion etc. in main workshop section.From infuser out through extruding after the wet dregs of rice, generally all contain the solvent of 25% ~ 35% and a certain amount of moisture, the dregs of rice containing solvent and moisture are referred to as the wet dregs of rice.The common method that the wet dregs of rice slough solvent and moisture is by means of heating, the solvent in the wet dregs of rice and moisture is made to obtain heat energy and vaporize, thus be separated with the dregs of rice, this borrow heat energy from solid material, remove hygroscopic water (solvent and moisture) operate in chemical industry the drying being called solid, hygroscopic water is from wet dregs of rice diffusion inside to surface, and then vaporizes and transfer in gas phase.But the necessary all condensations of dry tail vapour of the wet dregs of rice, reuse, could be reasonable economically, and maintain normal production.
Existing protein concentrate production technology, widely used wet dregs of rice desolventizing machine: is the high bed of material dryer that former German LURGI develops, and is mainly used in dividing lower solid material into immersion; One is the DT(precipitation-roasting dregs of rice developed on schumacher patent basis), DTDC (precipitation-roasting dregs of rice-drying-cooling) etc.Its basic operation principle is similar, the wet dregs of rice come from extruder are directly delivered to horizontal drier, then send into disc type (or being called vertical) drying machine by conveying mechanism and carry out depth drying, wherein adopt superheated steam contact drying in horizontal drier, vertical drier adopts superheated steam contact drying and hot blast convection drying 2 kinds of modes.In the dried tail gas of horizontal drier and vertical drier, the tail gas of superheated steam contact drying is collected into condenser and carries out condensation, obtains the mixed liquor of alcohol and water, reuses for process cycles.
Visible, the process that the wet dregs of rice remove hygroscopic water experienced by gasification-condensation two links, in conventional protein concentrate production technology, the gasification latent heat that dry run needs live steam to provide a large amount of, condensation process needs a large amount of cooling waters to provide corresponding condensation latent heat equally.Drying process is the maximum link that consumes energy in protein concentrate production process, accounts for about 65%.And in the heated-air drying part of vertical drier, very easily glue long-pending material at the bottom surface of vertical shaft and material disc, cause and go mouldy, cause Escherichia coli to exceed standard, product quality is not up to standard.
If the drying process of the wet dregs of rice can be improved, reduce heat energy and power consumption on the one hand, reduce solid accumulation on the other hand, significantly can reduce the production cost of protein concentrate, and improve the quality of albumen powder, improve product competition level.
Summary of the invention
The object of the invention is the high energy consumption for overcoming wet dregs of rice drying in existing protein concentrate production process and inferior technical deficiency, a kind of wet dregs of rice drying system based on mechanical steam recompression and drying process are provided, its energy consumption for drying are low, equipment without dead angle, material not easily pile up sex change, alcoholic solution recovery without the need to a large amount of water quench.
For achieving the above object, the present invention adopts following technical proposals:
A kind of wet dregs of rice drying system based on mechanical steam recompression, comprise digester, the discharging opening of digester is communicated with feed opening of press filter, the discharging opening of filter press is communicated with superheated steam rotary dryer, the indirect steam outlet of superheated steam rotary dryer communicates with the air entry of Mechanical Vapor Compression, the gas outlet of Mechanical Vapor Compression is communicated with the heating tube bundle of superheated steam rotary dryer inside, superheated steam rotary dryer is provided with the steam inlet communicated with its inside, superheated steam rotary dryer is also provided with the condensation-water drain communicated with the first storage tank, the discharging opening of superheated steam rotary dryer is communicated to hot air fluidized bed dryer, first storage tank communicates with the heating tube in hot air fluidized bed dryer, the liquid outlet of hot air fluidized bed dryer is communicated to the second storage tank, second storage tank liquid outlet is communicated to the inlet of digester.
The inlet of described digester is connected with fresh alcoholic solution source with the second storage tank respectively by pipeline in parallel, and the parallel pipeline be connected with fresh alcoholic solution source with the second storage tank is respectively equipped with the first valve and the second valve.
Steam inlet place on described superheated steam rotary dryer is provided with the 3rd valve; The pipeline that the gas outlet of described Mechanical Vapor Compression is connected with the heating tube bundle of superheated steam rotary dryer inside is provided with the 4th valve.
Described second storage tank liquid outlet by pump and pipeline communication to the inlet of digester.
The first temperature and pressure harvester is provided with in described superheated steam rotary dryer.
The steam inlet place of described superheated steam rotary dryer is provided with the 4th temperature and pressure harvester.
The air entry of described Mechanical Vapor Compression and gas outlet place are respectively equipped with the 3rd and warmly take and pressure acquisition device.
The 5th temperature and pressure harvester is provided with in described hot air fluidized bed dryer.
Utilize the drying process based on the wet dregs of rice drying system of mechanical steam recompression, step is as follows:
1) fresh alcoholic solution and dregs of beans raw material are delivered in the lump in digester and soak extraction;
2) the wet dregs of beans after extraction is delivered in filter press and carries out mechanical presses dehumidification;
3) the wet dregs of rice after dehumidification are delivered in superheated steam rotary dryer via auger;
4), during system boot, the heating tube bundle that a part of initial steam in external steam source enters in superheated steam rotary dryer is interior as described dry starting up's thermal source;
5) in dry run, the wet dregs of rice remove hygroscopic water and produce a large amount of indirect steam and alcohol and water mixed vapour, indirect steam is connected to the air entry of Mechanical Vapor Compression, indirect steam is by after described compressor depth-compression, steam pressure and temperature are all significantly improved and become superheated steam, this part superheated steam is delivered to heating tube bundle in superheated steam rotary dryer, stop supply initial steam to enter vapours rotary dryer simultaneously, namely replaced initial steam as drying source by the indirect steam after compressing, complete dry start process;
6) in dry run, only in the front end inlet of superheated steam rotary dryer, fill into the initial steam that conventional wet dregs of rice drying process need use 10% of quantity of steam (by volume), this part initial steam works to take airflow field, temperature field and hygroscopic water concentration field in wet and optimizing drying machine;
7) by the indirect steam after compressing, obtain cooling complete heat effect in the heating tube bundle of superheated steam rotary dryer after and become alcohol and water condensation by mixing liquid to be back to the first storage tank for subsequent use;
8) in superheated steam rotary dryer, complete the dry wet dregs of rice and enter hot air fluidized bed dryer through conveying device, fluid bed dryer heating pipe built-in, alcohol in first storage tank and water condensation by mixing liquid heat the wet dregs of rice by transport pump to the heating tube of fluid bed dryer, and the alcohol and the water condensation by mixing liquid that complete heat effect are back to the second storage tank;
9) complete at hot air fluidized bed dryer namely the wet dregs of rice of depth drying and protein concentrate to complete protein concentrate processing wet dregs of rice dry run through cyclone collection, pack.
Alcohol in second storage tank of described step 8) and water condensation by mixing liquid adjustment further reach use alcohol concentration after by transport pump in digester, thus complete recycling and reusing of alcohol and water condensation by mixing liquid.
The material import and export of each unit, medium import and export the sealing device being equipped with and preventing material and medium from revealing.
In the present invention, first dregs of beans enters extruder after lixiviate, in extruder, the hygroscopic water (alcohol and water) of the wet dregs of rice is down to about 55% by initial 65%, then steam rotary dryer is delivered to by conveyer device&apos, dry start process provides heat by superheated steam, indirect steam is produced after hygroscopic water removes, indirect steam is via collection, conveying device enters mechanical vapor compressor, after compressor compresses, steam pressure, temperature is significantly increased and becomes superheated steam, this part superheated steam is admitted in the heating tube in steam rotary dryer and substitutes live steam, complete rotary dryer and mechanical steam recompression device cooperation after start process, dry run only needs the live steam of minute quantity to fill in rotary dryer, lose for supplemental heat and supplement input and output material heat content, significantly reduce the dry consumption to external live steam, primary steam air consumption is only the 5-10% of existing drying process, the temperature field taken in wet and optimizing drying machine can be played simultaneously, the effect of hygroscopic water concentration field.From the indirect steam of vapour compression machine while heat drying material, be able to cooling and become liquid alcohol water blend, alcoholic solution is back in storage tank for subsequent use.
In the dry drying machine of steam rotary, complete dry material adopts screeding device to be delivered to air drier, air drier adopts the fluidized bed drying pattern of heating pipe built-in, configuration blower fan completes the fluidisation of material, and the alcoholic solution circulating pump in storage tank is delivered in air drier and completes interior heating process in heating tube.Alcoholic solution after cooling is transported to front-end process-leaching process that protein concentrate is produced, and the repetitive cycling completing alcohol uses.
It seems from whole process analysis, wet heat needed for dregs of rice drying is only the temperature rise sensible heat heat consumption of wet stock, compared to existing drying process, wet dregs of rice drying process energy consumption based on function of mechanical steam recompression device (MVR) is few, and the energy consumption of this drying process is only about 15% of existing conventional drying process energy consumption in theory.Alcohol recycle process no longer needs cooling water, and reduce heat energy and power consumption, without the need to condensing plant, initial cost and operating cost reduce greatly.
Accompanying drawing explanation
Fig. 1 is system flow chart of the present invention;
1-digester, 2-filter press, 3-rotary dryer, 4-the 3rd valve, 5-the 4th valve, 6-Mechanical Vapor Compression (MVR), 7-first storage tank, 8-pump, 9-fluid bed dryer, 10-second storage tank, 11-pump, 12-first valve, 13-second valve.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
In Fig. 1, wet dregs of rice drying system comprises a superheated steam rotary dryer 3, Mechanical Vapor Compression 6, internal heating fluidized bed drying machine 9 and conveying, storage device.
The discharging opening of digester 1 is communicated with filter press 2 charging aperture, the discharging opening of filter press 2 is communicated with superheated steam rotary dryer 3, the indirect steam outlet of superheated steam rotary dryer 3 communicates with the air entry of Mechanical Vapor Compression 6, the gas outlet of Mechanical Vapor Compression 6 is communicated with the heating tube bundle of superheated steam rotary dryer 3 inside, superheated steam rotary dryer 3 is provided with the steam inlet communicated with its inside, superheated steam rotary dryer 3 is also provided with the condensation-water drain communicated with the first storage tank 7, the discharging opening of superheated steam rotary dryer 3 is communicated to hot air fluidized bed dryer 9, first storage tank 7 communicates with the heating tube crossed in hot air fluidized bed dryer 9, the liquid outlet of hot air fluidized bed dryer 9 is communicated to the second storage tank 10, second storage tank 10 liquid outlet is communicated to the inlet of digester 1.
The inlet of digester 1 is connected with fresh alcoholic solution source with the second storage tank 10 respectively by pipeline in parallel, and the parallel pipeline be connected with fresh alcoholic solution source with the second storage tank 10 is respectively equipped with the first valve 12 and the second valve 13.
Steam inlet place on superheated steam rotary dryer 3 is provided with the 3rd valve 4; The pipeline that the gas outlet of Mechanical Vapor Compression is connected with the heating tube bundle of vapours rotary dryer inside is provided with the 4th valve 5.
Second storage tank 10 liquid outlet by pump 11 and pipeline communication to the inlet of digester 1.The first temperature and pressure harvester is provided with in superheated steam rotary dryer 3.The steam inlet place of superheated steam rotary dryer 3 is provided with the 4th temperature and pressure harvester.The air entry of Mechanical Vapor Compression 6 and gas outlet place are respectively equipped with the 3rd and warmly take and pressure acquisition device.The 5th temperature and pressure harvester is provided with in hot air fluidized bed dryer 9.
During system boot, second valve 13 is opened, first valve 12 is closed, fresh alcoholic solution and dregs of beans raw material are delivered in digester 1 in the lump, dregs of beans through certain density alcohol-water solution in infuser 1 soak extraction after, wet dregs of beans is delivered in filter press 2 and carries out mechanical presses dehumidification, the wet dregs of rice removing a part of surface water are delivered in superheated steam rotary dryer 3 via auger, during system boot, rotary dryer 3 needs a certain amount of initial steam to provide starting up thermal source, now the 3rd valve 4 is opened, 4th valve 5 is closed, initial steam enters via the 3rd valve 4 in the heating tube bundle D in drying machine 3 as dry starting up's thermal source, in dry run, the wet dregs of rice remove hygroscopic water and produce a large amount of indirect steam (alcohol and water mixed vapour), indirect steam is connected to the suction inlet A of Mechanical Vapor Compression 6 via metal hose, indirect steam is by after compressor 6 depth-compression, steam pressure and temperature are all significantly improved and become superheated steam, this part superheated steam is delivered to heating tube bundle D in rotary dryer 3, close the 3rd valve 4 simultaneously, stop the initial steam that supply is a large amount of, namely initial steam is replaced as drying source by the indirect steam after compressing, complete dry start process.
Only at the front end inlet place C of rotary dryer 3, fill into a small amount of initial steam, this part a small amount of steam works to take airflow field, temperature field and hygroscopic water concentration field in wet and optimizing drying machine.
Obtain cooling after being completed heat effect by the indirect steam after compressing in the heating tube bundle D of drying machine 3 to become condensate liquid to be back to the first storage tank 7 for subsequent use.The wet dregs of rice completing dry first stage drying in rotary dryer 3 enter hot air fluidized bed dryer 9 through conveying devices such as scraper plates, fluid bed dryer heating pipe built-in E, alcohol-water solution in storage tank is delivered to the heating tube E heated material of fluid bed dryer 9 by pump 8, completes alcohol-water solution return to the second storage tank 10 of heat effect.Namely the wet dregs of rice of depth drying and protein concentrate to complete protein concentrate processing wet dregs of rice dry run through cyclone collection, pack is completed at fluid bed inner drying machine 9.
After whole system is normally run, close the second valve 13, the alcohol-water solution opening in the first valve 12, second storage tank 10 is delivered in digester 1 by pump 11 after adjusting alcohol concentration further, thus completes recycling and reusing of alcohol-water solution.
In whole system, need to carry out data acquisition and controlling to the temperature and pressure at following a few place: the pressure P 1 of rotary dryer 3 inside and temperature T1, the pressure P 2 of indirect steam at Mechanical Vapor Compression 6 suction inlet place that drying machine 3 is discharged and temperature T2, the pressure P 3 in Mechanical Vapor Compression 6 exit and temperature T3, the pressure P 4 at rotary dryer 3 steam inlet place and temperature T4, the pressure P 5 of fluid bed dryer 9 inside and temperature T5.Controlled pressure P1, P4 and P5 object guarantees that the pressure in rotary dryer 3 and fluid bed dryer 9 is in safe operating range, and detection and control temperature T1, T4 and T5 can meet drying process requirement, to ensure rate of drying and drying effect; Detected pressures P2, P3, T2 and T3 can determine whether Mechanical Vapor Compression is in normal operating conditions; to guarantee that Mechanical Vapor Compression 6 normally works and provides the compressed steam of set parameter; by the comparison to P3, T3 and P4, T4 numerical value, control the aperture entering rotary dryer 3 heating tube two-way jet chimney valve.
In whole dry run, the alcohol-water removed obtains condensation in the art and discharges latent heat, and not utilizing a large amount of cooling waters to carry out condensation, the thermal energy consumption of minimizing, does not have the circulation power consumption of recirculated water, without the power consumption of cooling tower, do not have loss such as the water of cooling tower elegant grade, to the wet dregs of rice drying that protein concentrate is produced, energy consumption saving is very considerable, greatly can reduce the production cost of product, improve the competitiveness of product.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (10)

1. the wet dregs of rice drying system based on mechanical steam recompression, comprise digester, the discharging opening of digester is communicated with feed opening of press filter, the discharging opening of filter press is communicated with superheated steam rotary dryer, it is characterized in that, the indirect steam outlet of superheated steam rotary dryer communicates with the air entry of Mechanical Vapor Compression, the gas outlet of Mechanical Vapor Compression is communicated with the heating tube bundle of superheated steam rotary dryer inside, superheated steam rotary dryer is provided with the steam inlet communicated with its inside, superheated steam rotary dryer is also provided with the condensation-water drain communicated with the first storage tank, the discharging opening of superheated steam rotary dryer is communicated to hot air fluidized bed dryer, first storage tank communicates with the heating tube in hot air fluidized bed dryer, the liquid outlet of hot air fluidized bed dryer is communicated to the second storage tank, second storage tank liquid outlet is communicated to the inlet of digester.
2. the system as claimed in claim 1, it is characterized in that, the inlet of described digester is connected with fresh alcoholic solution source with the second storage tank respectively by pipeline in parallel, the parallel pipeline be connected with the second storage tank is provided with the first valve, the parallel pipeline be connected with fresh alcoholic solution source is provided with the second valve.
3. the system as claimed in claim 1, is characterized in that, the steam inlet place on described superheated steam rotary dryer is provided with the 3rd valve; The pipeline that the gas outlet of described Mechanical Vapor Compression is connected with the heating tube bundle of superheated steam rotary dryer inside is provided with the 4th valve.
4. the system as claimed in claim 1, is characterized in that, described second storage tank liquid outlet by pump and pipeline communication to the inlet of digester.
5. the system as claimed in claim 1, is characterized in that, is provided with the first temperature and pressure harvester in described superheated steam rotary dryer.
6. the system as claimed in claim 1, is characterized in that, the steam inlet place of described superheated steam rotary dryer is provided with the 4th temperature and pressure harvester.
7. the system as claimed in claim 1, is characterized in that, the suction inlet place of described Mechanical Vapor Compression is provided with the second temperature and pressure harvester, and the gas outlet place of Mechanical Vapor Compression is provided with the 3rd pressure and temperature harvester.
8. the system as claimed in claim 1, is characterized in that, is provided with the 5th temperature and pressure harvester in described hot air fluidized bed dryer.
9. utilize the drying process based on the wet dregs of rice drying system of mechanical steam recompression, it is characterized in that, step is as follows:
1) fresh alcoholic solution and dregs of beans raw material are delivered in the lump in digester and soak extraction;
2) the wet dregs of beans after extraction is delivered in filter press and carries out mechanical presses dehumidification;
3) the wet dregs of rice after dehumidification are delivered in superheated steam rotary dryer via auger;
4), during system boot, the heating tube bundle that a part of initial steam in external steam source enters in superheated steam rotary dryer is interior as described dry starting up's thermal source;
5) in dry run, the wet dregs of rice remove hygroscopic water and produce a large amount of indirect steam and alcohol and water mixed vapour, indirect steam is connected to the air entry of Mechanical Vapor Compression, indirect steam is by after described compressor depth-compression, steam pressure and temperature are all significantly improved and become superheated steam, this part superheated steam is delivered to heating tube bundle in superheated steam rotary dryer, stop supply initial steam to enter vapours rotary dryer simultaneously, namely replaced initial steam as drying source by the indirect steam after compressing, complete dry start process;
6) in dry run, only in the front end inlet of superheated steam rotary dryer, fill into the initial steam that conventional wet dregs of rice drying process need use 10% of quantity of steam, this part initial steam works to take airflow field, temperature field and hygroscopic water concentration field in wet and optimizing drying machine;
7) by the indirect steam after compressing, obtain cooling complete heat effect in the heating tube bundle of superheated steam rotary dryer after and become alcohol and water condensation by mixing liquid to be back to the first storage tank for subsequent use;
8) in superheated steam rotary dryer, complete the dry wet dregs of rice and enter hot air fluidized bed dryer through conveying device, fluid bed dryer heating pipe built-in, alcohol in first storage tank and water condensation by mixing liquid heat the wet dregs of rice by transport pump to the heating tube of fluid bed dryer, and the alcohol and the water condensation by mixing liquid that complete heat effect are back to the second storage tank;
9) complete at hot air fluidized bed dryer namely the wet dregs of rice of depth drying and protein concentrate to complete protein concentrate processing wet dregs of rice dry run through cyclone collection, pack.
10. technique as claimed in claim 9, it is characterized in that, described step 8) the second storage tank in alcohol and water condensation by mixing liquid further adjustment reach use alcohol concentration after by transport pump in digester, thus complete recycling and reusing of alcohol and water condensation by mixing liquid.
CN201410074418.7A 2014-03-03 2014-03-03 Based on wet dregs of rice drying system and the drying process of mechanical steam recompression Active CN103822454B (en)

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JP5865471B1 (en) * 2014-12-02 2016-02-17 月島機械株式会社 Rotary dryer with indirect heating tube and drying method
CN105815542A (en) * 2016-04-01 2016-08-03 山东凯斯达机械制造有限公司 Method and device for desolventizing alcohol leached protein concentrate
CN105865191A (en) * 2016-04-22 2016-08-17 天华化工机械及自动化研究设计院有限公司 Method for vinasse tube bank type drying and exhaust gas and steam condensed liquid heat recycling
CN111406828A (en) * 2020-03-30 2020-07-14 山东凯斯达机械制造有限公司 Device and process for extracting soybean effective components by using mixed solvent

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CN2893592Y (en) * 2005-04-21 2007-04-25 陕西科技大学 Energy-saving rotary drum drying device
CN201706871U (en) * 2010-06-30 2011-01-12 国家粮食局科学研究院 Low-temperature high-efficiency fluidized combination drying device
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