CN102976368A - Method for lowering inorganic ultrafine powder slurry moisture content by adding rotary drum pressurizing type filtering machine - Google Patents
Method for lowering inorganic ultrafine powder slurry moisture content by adding rotary drum pressurizing type filtering machine Download PDFInfo
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- CN102976368A CN102976368A CN2011102678148A CN201110267814A CN102976368A CN 102976368 A CN102976368 A CN 102976368A CN 2011102678148 A CN2011102678148 A CN 2011102678148A CN 201110267814 A CN201110267814 A CN 201110267814A CN 102976368 A CN102976368 A CN 102976368A
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Abstract
The invention proposes a method for lowering energy consumption for drying inorganic ultrafine powder slurry by adding a rotary drum pressurizing type filtering machine. A pressurizing rotary drum filtering machine system is added in front of a conventional paddle dryer, and the inorganic ultrafine powder slurry moisture content is greatly reduced by pressure filtration. The method is characterized by continuous operation, saved energy, lowered consumption, reduced tail gas discharge quantity, and conformity with the national industrial policy of energy conservation and emission reduction.
Description
Technical field
The present invention relates to the energy conservation field of inorganic powder filtration, drying, exactly is that a kind of inorganic superfine powder somaplasm material filters and the two-stage Aassociation drying, in order to reduce inorganic superfine powder somaplasm material moisture content.
Background technology
Then the general Plate Filtration that adopts in original inorganic superfine powder body production process adopts predrying by blade and the dry combination drying technology that forms of micro mist.Its working process is:
Solid content being about 10% inorganic superfine powder somaplasm material is about 50% filter cake by Plate Filtration to moisture content, then enters in the blade dryer continuous uniform.Under the indirect heating of saturation steam, moisture evaporates rapidly.The moisture content of material is reduced to 15～20% after predrying, behind loose pulverulent material, sends into micron dryer by worm conveyor and carries out secondary drying.
Through the dried material of one-level by the worm conveyor continuous uniform join micron dryer after, under the acting in conjunction of the rotary type agitator of drying machine bottom and warm air, material is broken up by rapid drying.Dried material rises in the dryer inner rotation with hot blast, at the top of drying machine classifier is housed.After small particle is taken out of drying machine by classifier by hot blast, collected by follow-up tripping device; After mixing with follow-up wet stock, further pulverized large particle.Because the back mixing of dry powder and wet stock has improved sticking wall and agglomerating phenomenon.The moisture content of material is reduced to 0.5% (wt) after the micro mist drying, becomes qualified inorganic superfine powder body product.
The problem that above-mentioned flow process exists is:
1. original inorganic superfine powder body production technique adopts flame filter press batch production biscuit, must increase the people for carrying out non-productive operation.This is so that the operational cycle of batch filter is longer, hand labor intensity is large, working efficiency and stable aspect, all far below continuous filter.
Batch filter is used to process more is with mordant liquid to be filtered, and operator are just necessary Long contact time corrosives also, so the security aspect is relatively poor.
2. the inorganic superfine powder body filter cake moisture content after filtering is still very high, is about 50%, is dried to 15～20% by blade dryer fully, needs to strengthen the drying power of blade dryer.Therefore in the situation that output is identical, equipment volume is large, and cost is high; Simultaneously, evaporated water is large, big energy-consuming.
Summary of the invention
In view of above-mentioned, the object of the present invention is to provide a kind of method that rotary drum adding pressure type filter reduces inorganic superfine powder somaplasm material moisture content of setting up, namely before existing blade dryer system and micro mist dehumidification system, set up the pressure drum filter system.Remove the most of hygroscopic water of magnesium hydroxide slurry by the pressure filtration mode, the product introduction blade dehumidification system after the filtration, hygroscopic water is got back to the production system batching and is used.
The object of the present invention is achieved like this:
A kind of rotary drum pressure filtration formula of setting up is filtered the method that reduces the dry energy consumption of inorganic superfine powder soma, it is characterized in that: the filtering unit that enters filter-press after the supercharging of inorganic superfine powder somaplasm liquid process mother liquor pump is indoor, inorganic superfine powder body suspended substance in the slip is constantly separated with liquid, the inorganic superfine powder body is saved bit by bit in the filtering unit chamber and is formed gradually filter cake after separating, and separates filtrate pipe that filtrate is connected with control head by filtrate filtering unit chamber and discharges after filtration liquid pump and collect to the filtrate collection tank; Filter cake after compression is filtered enters in the blade dryer at the filter-press discharge zone, and the high temperature saturation steam passes into and carries out predrying to material in the axle sleeve of blade dryer and the chuck; Heat is delivered to outside surface by the blade dryer wall, carry out thermo-contact with the wet inorganic superfine powder body filter cake that enters, rotation along with blade spindle, material progressively moves to the discharge port of blade dryer, the inorganic superfine powder body material that is dried as moisture≤15% (wt) enters screw feeder, and is directly emptying by chimney from be evaporated wet part of carrying micro-dust secretly of blade dryer simultaneously; Material after blade dryer is predrying enters in the micropowder dryer through worm conveyor and rotary valve, air after air filter filters blasts steam heater and the heat exchange of high temperature saturation steam by gas blower simultaneously, being heated to 150 ℃ laggardly enters in the micropowder dryer and mixing of materials, under the effect of agitator, material is broken up rapidly, drying; Dry qualified material enters in the pulsed jet cloth filter by the micropowder dryer top with hot blast, and the inorganic superfine powder body product of collecting enters the product feed bin by rotary valve, discharges through rotary valve.Clean tail gas after the dedusting of pulse sack cleaner is emptying by induced draft fan.
Be compared with the prior art, the beneficial effect of characteristics of the present invention and generation is:
1, in the prior art, inorganic superfine powder somaplasm material adopts Plate Filtration or directly adopts blade dryer dry the inorganic superfine powder body filter cake of moisture content about 50%.Flame filter press is equipment at intermittence, and the operational cycle is long, and hand labor intensity is large, inefficiency.Adopt the blade dryer convection drying, evaporated water is large, big energy-consuming, and equipment volume is large, and fabrication cost is high.The drum pressurizing filter of setting up in the inorganic superfine powder somaplasm material filtration drying of the present invention has changed mode of operation and method.Drum pressurizing filter is a kind of non-stop run equipment, and high efficiency has reduced hand labor intensity, simultaneously, reduce contacting of operator and inorganic superfine powder body material, avoided the injury to personnel, especially large to corrodibility material, the effect of avoiding personnel to injure is more obvious.Energy-conservation aspect adopts the filter type dehumidifying, does not need to add heat and carries out drying, has saved a large amount of heat energy.Simultaneously, through verification experimental verification, inorganic superfine powder somaplasm material is after drum pressurizing filter filters, and moisture content can be down to about 35%, good filtration effect, and this has also alleviated load greatly for the blade dehumidification system, has saved heat energy.Be suitable for carrying out the system of micro mist drying or the material filtering that moisture content is large, viscosity is little.
2, the present invention is new technology, the novel process of inorganic superfine powder soma drying process and two kinds of routine techniques combinations of rotary drum Pressure Filter System.Equipment adopts routine or standard equipment, and system is simple, and operability is high, and the slurry treatment capacity is large.
3, adopt the pressure filtration mode dry among the present invention, it is large to be fit to moisture content, and the material that viscosity is little, but decrease material moisture content are compared with the conventional heating drying mode and to have been saved a large amount of heat energy, have reduced the load of blade dryer.
4, adopt pressure filtration mode moisture out to get back to system's batching among the present invention and use, realize the water circuit utilization, save the fresh water of a large amount of making beating usefulness.
5, the topmost characteristics of the present invention are energy-conservation, and original technology is behind Plate Filtration, and moisture content still is about 50%, after adopting present method, inorganic superfine powder somaplasm material after filtering moisture content can reach about 35%, has greatly alleviated the drying load of follow-up workshop section, and energy-saving effect is obvious.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Among the figure: 1-mother liquor pump, 2-drum pressurizing filter, 3-compressed gas surge tank, 4-filtrate collection tank, 5-filtrate pump, 6-blade dryer, 7-screw feeder, 8,15,17-rotary valve, 9-micro mist fly-ash separator, 10-air filter, 11-gas blower, 12-steam heater, 13-sack cleaner, 14-induced draft fan, 16-finished product bin (annotate: 1～5 equipment is the drum pressurizing filter system that sets up, and 6～17 is original inorganic superfine powder soma drying system)
Embodiment
The inorganic superfine powder somaplasm material of indication of the present invention is magnesium hydroxide slurry; The rotary drum Pressure Filter System of setting up is drum pressurizing filter, mother liquor pump, filtrate pump, compressed gas surge tank and filtrate collection tank, and wherein: mother liquor pump and filtrate pump are slush pump or reach for delivery of the pump that contains solid particulate for shurry pump or for spiral pump or for hose pump; Drum pressurizing filter (patent No.: ZL 2,009 2 0144208.5) is the Tianhua Chemical Machinery ﹠ Automation Design Inst patent equipment.
Below in conjunction with accompanying drawing technical process of the present invention is described in any further:
Step 1: the filtering unit that enters filter-press 2 after 1 supercharging of magnesium hydroxide slurry process mother liquor pump is indoor, and filter-press 2 rotates in the mode of speed control by frequency variation.Annular zone between rotary drum and shell adopts packing seal, and from be isolated part and be divided into different air tight housings, in air tight housing, pass into the separating unit compressed gas of 0.3MPa (G), make filter-press 2 be in the band pressure condition.Separating unit compressed gas pressure is regulated control by compressed gas surge tank 3.The surface of rotary drum is comprised of the filtering unit chamber that is connected with control head by filtrate pipe, under the band pressure condition, magnesium hydroxide suspended substance in the slip is constantly separated with liquid, magnesium hydroxide is saved bit by bit in the filtering unit chamber and is formed gradually filter cake after separating, and continues compressed air in subsequently the element cell and compress filtration along with the rotation of rotary drum is transported to; Separating filtrate pipe that filtrate is connected with control head by filtrate filtering unit chamber discharges after filtration liquid pump 5 and collects to filtrate collection tank 4.
Step 2: the filter cake after compression is filtered enters in the blade dryer 6 at filter-press 2 discharge zones, and the high temperature saturation steam passes into and carries out predrying to material in the axle sleeve of blade dryer 6 and the chuck; Heat is delivered to outside surface by blade dryer 6 walls, carry out thermo-contact with the wet inorganic superfine powder body filter cake that enters, compression is filtered and is adopted the pressurized air of 0.2MPa (G) that the magnesium hydroxide slurry that enters element cell is pushed purging, water in the magnesium hydroxide filter cake etc. is deviate from, after compression is filtered and is finished, rotation along with blade spindle, material progressively moves to the discharge port of blade dryer 6, the inorganic superfine powder body material that is dried as moisture≤15% (wt) enters screw feeder 7, and is directly emptying by chimney from be evaporated wet part of carrying micro-dust secretly of blade dryer 6 simultaneously.
Rotation magnesium hydroxide suspended substance is transported in subsequently the element cell in the rotary drum, and the water that squeezes out be connected the delivery pipe discharge that filter-press 2 element cells are connected with control head with pressurized air, enter in the filtrate collection tank 4 and collect.
Step 3: the process of repeating step two repeats compression.
Step 4: the material after blade dryer 6 is predrying enters in the micropowder dryer 9 through worm conveyor 7 and rotary valve 8, air after air filter 10 filters blasts steam heater 12 and the heat exchange of high temperature saturation steam by gas blower 11 simultaneously, being heated to 150 ℃ laggardly enters in the micropowder dryer 9 and mixing of materials, under the effect of agitator, material is broken up rapidly, drying; Dry qualified material enters in the pulsed jet cloth filter 13 by micropowder dryer 9 tops with hot blast, and the inorganic superfine powder body product of collecting enters product feed bin 16 by rotary valve 15, discharges through rotary valve 17.Clean tail gas after 13 dedustings of pulse sack cleaner is emptying by induced draft fan 14.
The magnesium hydroxide filter cake that enters the discharge unit chamber is in the non-pressure district, carry out discharging in filter-press 2 discharge opening place portable scratch board mechanical forces with under the blowback air dual function of control head access discharge unit chamber 0.2MPa (G), the magnesium hydroxide filter cake that draws off is delivered to the blade dehumidification system.After discharging finishes, having the magnesium hydroxide filter cake of trace, to be trapped in active units indoor, therefore before entering next cycle, need respectively the filter screen of active units chamber to be cleaned and reverse blowing disposal by the washing water of 0.4MPa (G) and the air of 0.2MPa (G), the filter gauze cleaning water of carrying Microamounts of Hydrogen magnesium oxide filtrate secretly enters in the making beating tank by collection tube, and next batch magnesium hydroxide mother liquor enters next cycle by magnesium hydroxide mother liquor pump 1 topping-up pump.
Claims (3)
1. set up the method that rotary drum pressure filtration formula is filtered the dry energy consumption of reduction inorganic superfine powder soma for one kind, it is characterized in that: the filtering unit that enters filter-press (2) after the supercharging of inorganic superfine powder somaplasm liquid process mother liquor pump (1) is indoor, inorganic superfine powder body suspended substance in the slip is constantly separated with liquid, the inorganic superfine powder body is saved bit by bit in the filtering unit chamber and is formed gradually filter cake after separating, and separates filtrate pipe that filtrate is connected with control head by filtrate filtering unit chamber and discharges after filtration liquid pump (5) and collect to filtrate collection tank (4); Filter cake after compression is filtered enters in the blade dryer (6) at filter-press (2) discharge zone, and the high temperature saturation steam passes into and carries out predrying to material in the axle sleeve of blade dryer (6) and the chuck; Heat is delivered to outside surface by blade dryer (6) wall, carry out thermo-contact with the wet inorganic superfine powder body filter cake that enters, rotation along with blade spindle, material progressively moves to the discharge port of blade dryer (6), the inorganic superfine powder body material that is dried as moisture≤15% (wt) enters screw feeder (7), and is directly emptying by chimney from be evaporated wet part of carrying micro-dust secretly of blade dryer (6) simultaneously; Material after blade dryer (6) is predrying enters in the micropowder dryer (9) through worm conveyor (7) and rotary valve (8), air after air filter (10) filters blasts steam heater (12) and the heat exchange of high temperature saturation steam by gas blower (11) simultaneously, being heated to 150 ℃ laggardly enters in the micropowder dryer (9) and mixing of materials, under the effect of agitator, material is broken up rapidly, drying; Dry qualified material enters in the pulsed jet cloth filter (13) by micropowder dryer (9) top with hot blast, the inorganic superfine powder body product of collecting enters product feed bin (16) by rotary valve (15), discharges through rotary valve (17); Clean tail gas after pulse sack cleaner (13) dedusting is emptying by induced draft fan (14).
2. a kind of rotary drum pressure filtration formula of setting up as claimed in claim 1 is filtered the method that reduces the dry energy consumption of inorganic superfine powder soma, it is characterized in that above-mentioned rotary drum pressure filtration formula filtering system of setting up comprises drum pressurizing filter (2), mother liquor pump (1), compressed gas surge tank (3), filtrate collection tank (4), filtrate pump (5).
3. a kind of method that rotary drum adding pressure type filter reduces inorganic superfine powder somaplasm material moisture content of setting up as claimed in claim 1, it is characterized in that in the rotary drum Pressure Filter System of setting up mother liquor pump (1) and filtrate pump (5) are slush pump or for shurry pump or for spiral pump or can be used for carrying the pump that contains solid particulate for hose pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102678148A CN102976368A (en) | 2011-09-06 | 2011-09-06 | Method for lowering inorganic ultrafine powder slurry moisture content by adding rotary drum pressurizing type filtering machine |
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| CN2011102678148A CN102976368A (en) | 2011-09-06 | 2011-09-06 | Method for lowering inorganic ultrafine powder slurry moisture content by adding rotary drum pressurizing type filtering machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105709486A (en) * | 2016-01-27 | 2016-06-29 | 苏州诚亭自动化设备有限公司 | Outer wheel type filtering machine |
| CN106082294A (en) * | 2016-08-01 | 2016-11-09 | 刘冠华 | Aluminium hydroxide is dried conveyer device and the method for conveying aluminium hydroxide |
| CN109201704A (en) * | 2018-09-27 | 2019-01-15 | 兰州天大华瑞环境工程技术有限公司 | Vacuum drum filters tailings recycling treatment and Zero discharging system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105709486A (en) * | 2016-01-27 | 2016-06-29 | 苏州诚亭自动化设备有限公司 | Outer wheel type filtering machine |
| CN106082294A (en) * | 2016-08-01 | 2016-11-09 | 刘冠华 | Aluminium hydroxide is dried conveyer device and the method for conveying aluminium hydroxide |
| CN109201704A (en) * | 2018-09-27 | 2019-01-15 | 兰州天大华瑞环境工程技术有限公司 | Vacuum drum filters tailings recycling treatment and Zero discharging system and method |
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Application publication date: 20130320 |