CN1453112A - Crushing and drying method and apparatus for high-moisture diatomite - Google Patents
Crushing and drying method and apparatus for high-moisture diatomite Download PDFInfo
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- CN1453112A CN1453112A CN 02108678 CN02108678A CN1453112A CN 1453112 A CN1453112 A CN 1453112A CN 02108678 CN02108678 CN 02108678 CN 02108678 A CN02108678 A CN 02108678A CN 1453112 A CN1453112 A CN 1453112A
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Abstract
The present invention adopts a technological process including three-stage continuous drying and crushing, thrice separation and twice separation and recovering. The three-stage drying and crushing includes the initial drying of material in infrared stoving channel, the second drying after crushing in a horizontal drying tube and the third drying after crushing in a vertical drying tube. The product and the impurity are separated in two-stage adjustable sorter and recovered with vortex separator and cloth bag deduster. The infrared stoving channel has coal gas or natural gas as fuel and adopts mainly radiation heating with high heat efficiency, and the fume is used as heat source for the comprehensive utilization of heat energy and continuous production. The present invention is suitable for the drying of high-moisture diatomite and other material.
Description
The invention provides a kind of pulverizing and drying means and device of high-water diatomite.Its method is made of the technical process of three grades of successive dryings, pulverizing and three sortings, two-stage Separation and Recovery.Its device mainly is made of equipment such as infrared drying tunnel, pulverizer, airflow drying tube and sorting recovery.The solid material pulverizing, drying and the gas-solid isolation technique that belong to the operation field.
Diatomite is the deposition mineral of extinct plants and animal diatom remains-diatom test.Mainly form vesicular structure by the silicon gel of dehydration.The natural diatomaceous earth original soil contains a large amount of moisture.Because of the place of production, diatom type different with foreign matter content, original soil water content difference.The diatomite original soil water content of states such as U.S., day is at 30%-50%, and China's diatomite water content is mostly between 50%-60%.Because of the contained moisture of diatomite mainly among internal void, so false solid phase is arranged; In a single day be to be solid block under the common state, and be subjected to the extruding or the strike of external force, the moisture in the diatom test hole will flow out and become mud.Just because of this, diatomaceous pulverizing and drying then become a technical task.
At present, moisture at the diatomite below 40%, can pulverize with light-duty suspended type pulverizer, carry out air stream drying afterwards.And moisture at the diatomite more than 40%, promptly use light-duty suspended type pulverizer also the moisture in the diatom test can be hit out, cause material to stick on hammer leaf and the enclosure wall, plug machine and can't continue to pulverize.Therefore also can't directly carry out air stream drying.Existing method preferably has three kinds.The one, the original soil of high-moisture is pressed into big briquet, seasoning in shed.Reduce to about 10% through 60-90 days times (length takes time winter) moisture, pulverize again and drying.The advantage of this method is to have saved partial heat energy.Shortcoming is: 1) the natural drying cycle long, be subjected to weather effect, be difficult to guarantee large-scale commercial production.2) can infiltrate silt, cause secondary pollution.3) increased the pulverizing process of pressed compact, airing and dry body, the technology poor continuity.Second method is to adopt whizzer predrying earlier, and then pulverizes and air stream drying.This method can realize industrialized production; But, because the low (0.12-0.24kw/m of rotary drying film heat transfer coefficient
3.k), thereby thermo-efficiency is low, the cost height; Workshop dust density is big simultaneously, works under hard conditions.The third method is to adopt sawing cutting type grinder to pulverize original soil, carries out air stream drying afterwards.This method can directly be pulverized the promoting the circulation of qi fluidized drying of going forward side by side at the material below 55% with moisture.But for the natural material that contains impurity such as stone, regular meeting occurs damaging saw blade and the situation of shutting down; And moisture is 55% when above, and material also can be bonded on saw blade and the enclosure wall, and influence is worked continuously.
For overcoming the above-mentioned deficiency of prior art, the invention provides a kind of pulverizing and drying means and device of high-water diatomite, can process water content up to 60% diatom original soil and improve heat utilization efficiency and reduce cost, realize large-scale industrialization production.
The present invention adopts following technical measures to realize above-mentioned purpose.
1, adopts the technical process of three grades of successive dryings, pulverizing and three sortings, two-stage Separation and Recovery.It is predrying that the first step adopts infrared drying tunnel that the original soil of high-moisture is carried out, and moisture dropped to below 30% pulverize with light-duty suspended type pulverizer.The drying tube drying horizontal, that pipe bottom discharge openings that opening for feed is corresponding is equipped with the coarse fodder pulverizer is adopted in the second stage; By the sedimentation sorting, the macrobead that settles down returns the drying tube drying to material after crushed again at the discharge opening place, and enters blower fan together with major ingredient stream and pulverize once more.The third stage is with the higher vertical drying tube drying of gas velocity; Exsiccant materials flow adjustable speed product selecting machine sorting (for the second time), qualified materials flow enters cyclonic separator and separates, coarse fodder stream is pulverized once more with changeing tooth-like pulverizer, use adjustable speed impurity separator sorting (for the third time) then, discard impurity, available materials flow is sent product selecting machine circulation sorting back to blower fan again.Fine materials flow after the cyclonic separation is sent into sack cleaner Separation and Recovery once more with blower fan.
2, adopt the isolated infrared drying tunnel of the stack gas and the material that is dried, it is the infrared radiant material of matrix that the end interlayer of flue adopts SiC; At opening for feed one end a main burner is installed, both sides are installed a plurality of little auxiliary burners respectively; With coal gas or Sweet natural gas is fuel, mainly by thermal radiation mode HEATING INFRARED radiative material layer; Infrared radiant material heats by the material of radiation mode to lower floor again.
3, adopt the thermal source of the stack gas of infrared drying tunnel discharge as air stream drying.
By above-mentioned measure, realized the pulverizing and the air stream drying of high-water diatomite.Because the film heat transfer coefficient height (2.3-7.0kw/m of air stream drying
3.k), be rotary drying 20-30 doubly; And the predrying high radiation formula heating means of efficient that adopted; The stack gas that infrared drying tunnel is got rid of is again with comprehensive utilization; So the heat utilization efficiency height of total system, cost is low.Eliminated sawing cutting type grinder in addition, can stone or moisture are too high shut down because of having in the material.In addition, the present invention has realized carrying and the mechanize conveying in the negative pressure downstream, works continuously, and good work environment helps industrialized production.
Fig. 1 is a process flow diagram of the present invention.
Its technological process is reclaimed by predrying, pulverizing, first step air stream drying, pulverizing again, second stage air stream drying, product selecting, impurity sorting, product separation, fine product and the packing master operation constitutes.In first step air stream drying, there is one to pulverize the loop; The impurity sorting has the loop of a circulation pulverizing and sorting.
Fig. 2 is apparatus of the present invention structural representation.
Endless belt conveyor (1) exhaust end is to endless belt conveyor (2) feed end.Endless belt conveyor (2) adopts heatproof adhesive tape or steel band; Place among the infrared drying tunnel (3).The drying tunnel feed end is equipped with burner (4).The burner fuel import connects gaspipe line, and inlet mouth connects gas blower (5).Interlayer is infrared radiant material (3-1) at the bottom of the drying tunnel stack gas; There is a plurality of auxiliary burners hole (3-2) the flue both sides; Auxiliary burner (7) is installed on it; The steam outlet of the drying tunnel machine (6) of giving a dinner for a visitor from afar, the blower fan outlet connects chimney.Endless belt conveyor (2) discharge end is to pulverizer (8) opening for feed, and the pulverizer outlet connects horizontal airflow drying tube (9) opening for feed.The pipe bottom discharge openings of drying tube opening for feed correspondence connects coarse fodder pulverizer (10), and the outlet of coarse fodder pulverizer connects the thin tube part of drying tube outlet reducing; The drying tube inlet mouth connects the drying tunnel flue gas outlet, and the air outlet connects crushing blower (11).The crushing blower outlet connects the vertical drying tube in the second stage (12) import.Drying tube exports product separator (13) opening for feed of practicing midwifery.The outlet of product selecting machine coarse fodder connects pulverizer (15) opening for feed through valve (14).The pulverizer discharge port connects impurity separator (16) opening for feed.The outlet of impurity separator coarse fodder connects waste material bucket (17), and the fines outlet takes back the product selecting machine inlet capable through recirculation blower (18).The outlet of product selecting machine fines connects cyclonic separator (19) import.The cyclonic separator discharge port connects transfer roller (21) through valve (20); The air outlet connects sack cleaner (23) inlet mouth through blower fan (22).The fly-ash separator discharge opening connects transfer roller (24), and the air outlet connects chimney through blower fan (26).Transfer roller (24) discharge port connects transfer roller (21) through valve (25); Transfer roller connects wrapping machine.Constituted complete apparatus system thus.
Concrete operational process of the present invention is as follows:
Moisture material below 60% is sent into infrared drying tunnel through endless belt conveyor and is carried out predrying.The surface temperature of drying tunnel radiative material is regulated by the burner fuel amount of feed and air input at 300-500 ℃.Drying tunnel temperature is at 100--150 ℃.The speed of endless belt conveyor is controlled by buncher, makes predrying back material moisture below 30%.The water vapour of dry evaporation enters chimney by induced draft fan.Predrying good material enters first step drying tube through pulverizing, and the inlet air temperature of drying tube is about 350 ℃.Fines enters second stage drying tube after drying.Macrobead settles down, and enters the drying tube drying after the coarse fodder pulverizer is pulverized again once more.Merge materials flow and after blower fan is pulverized, enter second stage drying tube drying again.Second stage drying tube inlet temperature is about 250 ℃; Gas flow rate is higher than first step drying tube.Dried material is through the sorting of product separator, and qualified materials flow enters cyclonic separator; Underproof coarse fodder enters the sorting of impurity separator after pulverizing once more, available materials flow is sent product selecting machine circulation sorting back to through blower fan; Waste material is waste under the air supporting state.In thick product separate through valve at cyclonic separator and enter transfer roller.Fine product enter sack cleaner through blower fan to be separated, again through transfer roller with segregaion valve enters product conveyor and middle crude product mixes.Clean air and water vapour enter chimney through blower fan.The critical particle diameter of product selecting machine is regulated in the 10--100 mu m range as required.The critical grain of impurity separator is through regulating in the 50--150 mu m range.The sack cleaner inlet air temperature should be not less than 100 ℃.
The present invention is suitable for the pulverizing and the drying of porous materials such as the diatomite, silica gel of high-moisture; Also can be used for the production of super-cell and slow-release fertilizer agent.
Embodiment 1: adopt ZrO
2-SiC radiative material is done sealing coat at the bottom of the infrared drying tunnel flue, long 30 meters of drying tunnel, and feed end is equipped with a main burner, and 12 little auxiliary burners are installed in both sides; With air mixed coal gas is fuel, and the flue gas outlet temperature is about 400 ℃, and the radiative material surface temperature is 300-500 ℃.Steel band conveyor is installed, with buncher control belt speed in the drying tunnel.Dry moisture 60% Jilin Fusong diatomite, predrying back moisture 30%; Enter air stream drying, pulverizing and separation system through pulverizing.First step drying tube inlet air temperature is 350 ℃, and second stage drying tube inlet air temperature is 250 ℃, and the fly-ash separator inlet temperature is 105 ℃; The dry smart soil moisture 0.8% of Separation and Recovery.
Embodiment 2: as device and the processing condition of embodiment 1.Be used for the silica gel that dry moisture 50% the precipitator method are produced, predrying back raw material is moisture 25%, and behind the two-stage air stream drying, the product of recovery is moisture to be 0.6% (not comprising water of constitution).
Claims (5)
1, a kind of pulverizing of high-water diatomite and drying means is characterized in that adopting the technical process of three grades of successive dryings, pulverizing and three sortings.It is predrying that the first step adopts the infrared drying tunnel based on the radiation formula heat transfer that material is carried out, and makes that material is moisture is reduced to below 30% by 50%-60%, pulverizes again.The drying tube drying horizontal, that pipe bottom discharge openings that opening for feed is corresponding is equipped with the coarse fodder pulverizer is adopted in the second stage, and the macrobead that settles down enters crushing blower with major ingredient stream and pulverizes once more after the coarse fodder pulverizer is pulverized.The third stage is adopted vertical drying tube drying, and with the sorting of adjustable speed product selecting machine; The coarse fodder that sub-elects by adjustable speed impurity separator sorting waste, can utilize materials flow to send product selecting machine circulation sorting back to blower fan again after pulverizing for the third time.
2, the pulverizing of the described high-water diatomite of claim 1 and drying means, its feature also is to have adopted stack gas and the isolated infrared drying tunnel of material that is dried, with coal gas or Sweet natural gas is fuel, main by thermal radiation mode HEATING INFRARED radiative material layer, the infrared radiant material layer heats material by radiation mode again.
3, the pulverizing and the drying means of claim 1,2 described high-water diatomites, its feature also are to adopt the thermal source of about 350 ℃ stack gas of infrared drying tunnel discharge as air stream drying.
4, a kind of pulverizing of high-water diatomite and drying installation is characterized in that being connected and composed by handling equipment or pipeline by major equipments such as infrared drying tunnel, light-duty suspended type pulverizer, the horizontal drying tube of the first step, crushing blower, the vertical drying tube in the second stage, product selecting machine, pulverizer, impurity separator, cyclonic separator and sack cleaners.
5, the pulverizing of the described high-water diatomite of claim 4 and drying installation, its feature are that also infrared drying tunnel stack gas is isolated with the thing that is dried, and the end interlayer of flue has adopted infrared radiant material; At feed inlet end a main burner is installed, both sides are separately installed with a plurality of little auxiliary burners.The pipe bottom of the horizontal drying tube opening for feed of first step correspondence is equipped with the coarse fodder pulverizer, and the pulverizer outlet connects drying tube reducing thin tube part.
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| CN 02108678 CN1453112A (en) | 2002-04-23 | 2002-04-23 | Crushing and drying method and apparatus for high-moisture diatomite |
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| CN 02108678 CN1453112A (en) | 2002-04-23 | 2002-04-23 | Crushing and drying method and apparatus for high-moisture diatomite |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103550994A (en) * | 2013-10-25 | 2014-02-05 | 苏州宇洋环保设备制造有限公司 | Inlet air pressure-tapping anti-blocking device of bag-type dust collector |
| CN105944846A (en) * | 2016-05-16 | 2016-09-21 | 临江市精科硅藻土设备开发有限公司 | Low-grade raw diatomite purification and enrichment technology |
| CN106885461A (en) * | 2017-03-27 | 2017-06-23 | 内蒙古凯程农牧业科技有限公司 | A kind of drying plant and furnace drying method |
| CN112629167A (en) * | 2020-12-03 | 2021-04-09 | 佛山市中胜药业有限公司 | Borax drying method and equipment |
| CN113142518A (en) * | 2021-05-06 | 2021-07-23 | 石河子大学 | Crisp fruit and vegetable slice processing method and three-stage belt type infrared dryer adapting to method |
-
2002
- 2002-04-23 CN CN 02108678 patent/CN1453112A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103550994A (en) * | 2013-10-25 | 2014-02-05 | 苏州宇洋环保设备制造有限公司 | Inlet air pressure-tapping anti-blocking device of bag-type dust collector |
| CN105944846A (en) * | 2016-05-16 | 2016-09-21 | 临江市精科硅藻土设备开发有限公司 | Low-grade raw diatomite purification and enrichment technology |
| CN105944846B (en) * | 2016-05-16 | 2018-04-03 | 临江市精科硅藻土设备开发有限公司 | A kind of low-grade diatom original soil purification process of enriching |
| CN106885461A (en) * | 2017-03-27 | 2017-06-23 | 内蒙古凯程农牧业科技有限公司 | A kind of drying plant and furnace drying method |
| CN112629167A (en) * | 2020-12-03 | 2021-04-09 | 佛山市中胜药业有限公司 | Borax drying method and equipment |
| CN113142518A (en) * | 2021-05-06 | 2021-07-23 | 石河子大学 | Crisp fruit and vegetable slice processing method and three-stage belt type infrared dryer adapting to method |
| CN113142518B (en) * | 2021-05-06 | 2023-06-09 | 石河子大学 | Processing method of crisp fruit and vegetable slices and three-stage belt type infrared dryer suitable for same |
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