CN101303146B - Air cooling process for cooling high tower granulation fertilizer - Google Patents
Air cooling process for cooling high tower granulation fertilizer Download PDFInfo
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- CN101303146B CN101303146B CN2008100491474A CN200810049147A CN101303146B CN 101303146 B CN101303146 B CN 101303146B CN 2008100491474 A CN2008100491474 A CN 2008100491474A CN 200810049147 A CN200810049147 A CN 200810049147A CN 101303146 B CN101303146 B CN 101303146B
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Abstract
The invention relates to a new high tower fertilizer cooling technology of an air cooling device. The air cooling device comprises an air filter, a heat exchanger, an air dehumidifier, an air preheater and a draught fan, which are communicated sequentially, and a cooling pipe network is arranged in the heat exchanger. The technology comprises: (1) materials output from the tower, after a screen separation, are input into a vibrating fluidized bed for heat exchange with cold wind; (2) the cold air produced by the air cooling device is input into a vibrating cooling tower and then introduced into the vibrating fluidized bed, and exhaust gas discharged from the fluidized bed is collected and disposed; (3) materials output from the fluidized bed are input into the vibrating cooling tower for heat exchange with input cold wind and cooled materials are proceeded into a next working procedure. The technology of the invention has positive and beneficial effect that: while materials are cooled completely, the damage to material grains is reduced and the smoothness of the grains is improved; the water content of the cooled materials is reduced; energy is saved and consumption is reduced effectively, and production cost is reduced as well.
Description
Technical field
The present invention relates to a kind of cooling device and process for cooling, relate in particular to a kind of air-cooling apparatus of a kind of high tower granulation fertilizer semi-finished product novel technique for cooling and use thereof.
Background technology
China is at the nineties first cover melt formula high-tower granulation device that is constructed and put into operation in last century, and along with the progressively expansion of the fertile market demands of high tower, all parts of the country had been built up tens of cover high-tower granulation devices in succession in recent years.
Melt formula compound fertilizer production by tower granulation technology is simple, continuous progress along with production technology and equipment research, from raw materials for production processing, slurrying, be mixed into the slurry-spraying pelletizing operation, all relative perfect aspect device structure in technological process, but still continue to use rotating cylinder natural wind cooling technology in semi-finished product cooling processing operation, its technological process roughly as shown in Figure 1 always.Yet there is following problem in this kind cooling processing technology:
1. go out the process of tower material particles, under the active force that pushes, drops naturally at mechanical collision, cause the particle fragmentation and produce a large amount of powder, greatly destroyed the finished particle roundness through devices such as elevator, cooling cylinder, vibratory sieves;
2. through the mechanical collision friction, can make particle surface crude, destroy the finished particle surface smoothness;
3. go out the tower temperature of charge generally about 80 ℃, summer can be higher, adopts the natural wind cooling, even if through the cooling of secondary cooling cylinder, the finished product packing temperature still can be more than 50 ℃, and high temperature has aggravated the degree of agglomeration of finished product;
4. go out the tower material from being cooled to about 40 minutes finished product packing time, because the time is short, particle crystalline form transformation time is not enough, causes granule strength poor;
5. the air humidity of natural wind big (air humidity in summer is bigger) is a refrigerant with it, and product moisture content is increased, and has further aggravated the caking rate of finished product; 6. device therefor energy consumption height, the electric load amount is big.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of air-cooling apparatus cheaply, and has provided a kind of good cooling results, can improve the low high tower granulation fertilizer semi-finished product novel technique for cooling of product quality and energy consumption.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of high tower granulation fertilizer novel technique for cooling may further comprise the steps:
(1) goes out the tower material and after screening, enter vibrated fluidized bed, and stopped 20～40 minutes, carry out heat exchange with the cold wind that feeds;
(2) produce the cold air of 20～25 ℃ of temperature, relative humidity 30～50% with described air-cooling apparatus, it is fed the vibration cooling tower, to cause again in the described vibrated fluidized bed through the cold wind of vibration cooling tower, collect the waste gas that vibrated fluidized bed is discharged, carry out emptying after the harmless treatment;
(3) go out fluidised bed material inputted vibration cooling tower, the cold wind of material and feeding carries out 0.5～1.5 hour heat exchange in cooling tower, and cooled material enters next step operation.
Described air-cooling apparatus, contain air cleaner, heat exchanger, air dehumidifier and air-introduced machine, be laid with cooling pipe network in the described heat exchanger, this cooling pipe network is a refrigerant with the cold water that flows, heat exchanger air inlet one end is communicated in air cleaner, and its gas outlet one end is communicated with air dehumidifier, and described air-cooling apparatus also contains air preheater, the air dehumidifier gas outlet is communicated in air preheater, and the gas outlet of air preheater is communicated with air-introduced machine.
In described air cleaner, be filter medium with cashmere felt or rock cotton board, this filter medium evenly is fixed in the air cleaner casing.
Cooling pipe network in the described heat exchanger is regularly arranged heat radiation sheet.
In described air dehumidifier, be the condensation vapor media with asbestos material or fine and close steel wire, this media evenly is fixed in the dehumidifier casing.
Be provided with heating plate in the described air preheater.
Between described air preheater and air-introduced machine, be provided with volume damper.
In described step (2), described air-cooling apparatus is that cold coal is produced cold wind with 18～20 ℃ underground water, per 1.5～2kg underground water cooling 1kg air.
The cold wind feeding amount of described vibration cooling tower is 1～1.5: 1 with the mass ratio of going into the tower inventory.
Described vibration cooling tower contains vibration cooling storehouse, feed hopper, discharge port, vibrating motor, zone, middle and lower part in vibration cooling storehouse is provided with ventilation terminal, this ventilation terminal is made of regularly arranged groove shape section bar, this transverse section of section material is Λ or ⌒ shape, the air inlet in vibration cooling storehouse is arranged on and the corresponding zone of ventilation terminal, its air outlet is arranged on the top area in cooling storehouse, the vibration cooling is provided with charging aperture directly over the storehouse, its top area also is provided with the material level observation window, air inlet and cooling duct, connecting part between feed hopper and the charging aperture is and is flexible coupling, and the vibrating motor that drives vibration cooling storehouse is installed on the fixed support.
The present invention has actively useful effect:
(1) material cooling thoroughly goes out tower before go out finished product from material, and material can reach 1.5～2 hours cool time, has guaranteed that material obtains even, thorough cooling.After material cools off through vibrated fluidized bed, drop temperature can be lower than 40 ℃, in further cooling through the vibration cooling tower, the temperature of finished product packing can be reduced to below 32 ℃, can use no or little the anti-caking agent, finished product can not lump equally, does not occur caking phenomenon after the product that overtesting does not add anticaking agent is being increased 20 layers in 3 months.
(2) reduce the material particles breakage, particle fineness improves employing belt feeder convey materials, and flow process is simple, avoids because of using elevator, cooling cylinder that particulate material is produced mechanical damage; Material in vibrated fluidized bed and the vibration cooling tower is in the suspension fluidized state under the effect of adverse current cold wind, the descending process of material is slowly carried out, and can obviously reduce the breakage that produces because of material collision mill sassafras, has guaranteed particle appearance and fineness.
(3) reduce the former rotating cylinder cooling of material moisture moisture content of finished products about 2%, the cooled finished product water content of the present invention is avoided producing caking because of Moisture high UCL below 1%.As being refrigerant with underground water, carry out sufficient heat exchange with the air behind the process filtration, purification, the design work environment temperature is (annual about 4 months) up to 30～45 ℃, through the cold wind temperature that is produced after the heat exchange about 20 ℃, air themperature has a large amount of moisture when descending and separates out, after the air dehumidifier dehumidifying, again to the cold air preheating, obtain temperature and be 20～25 ℃, the cold air of humidity 30～50%, cooling can dehumidify to material with such cold wind, and can not increase the water content of material.
(4) energy-saving and cost-reducing, reduced production cost tube cooling installed capacity 350kw, existing new technology cooling installed capacity is 300kw, can obviously reduce production and operation cost; The underground water that heat exchange heats up goes to the boiler room to use, and both can make full use of water resource, can reduce steam consumption coal again, energy savings.
Description of drawings
Fig. 1 is a kind of traditional high tower granulation fertilizer rotating cylinder natural wind cooling technology schematic flow diagram;
Fig. 2 is a kind of schematic flow diagram of high tower granulation fertilizer novel technique for cooling;
Fig. 3 is a kind of air-cooling apparatus cross-sectional view;
Fig. 4 is a kind of front view that vibrates cooling tower;
Fig. 5 is a kind of cut-away section structural representation that vibrates cooling tower.
The specific embodiment
1 one kinds of air-cooling apparatuses of embodiment referring to Fig. 3, comprise air cleaner 1, heat exchanger 2, air dehumidifier 3, air preheater 4 and air-introduced machine 7, in air cleaner 3 casings, evenly are fixed with cashmere felt filter medium 12; In heat exchanger 2, be laid with the cooling pipe network 11 of heat dissipation type, water source under its water inlet ground connection, underground water with extraction is refrigerant, heat exchanger 2 air inlets one end is communicated to air cleaner 1, its gas outlet one end is communicated with air dehumidifier 3, air dehumidifier 3 is provided with the condensation vapor net sheet 10 that fine and close steel wire is made, airborne moisture is used to condense, air dehumidifier 3 gas outlets are communicated in air preheater 4, the gas outlet of air preheater 4 is communicated to air-introduced machine 7, the air of cooling is sent by air outlet 6, is provided with heating water heating radiator fin air 9 in the air preheater 4, supplies with thermal source by the boiler room.Be provided with volume damper 5 between described air preheater 4 and air-introduced machine 7, air-introduced machine 7 provides power by motor 8.
A kind of high tower granulation fertilizer novel technique for cooling, designed productive capacity: platform produces 400,000 tons, 45 ℃ of high workload ambient air temperatures, referring to Fig. 2, Fig. 4, Fig. 5, its technological process narration down:
(1) 80～100 ℃ go out the tower material through after belt feeder delivers to bolting, deliver to vibrated fluidized bed again, thermal material is under wind-force effect from bottom to top, suspend downwards and flow, stopped about 30 minutes, carry out heat exchange with the cold wind (30 ℃) that feeds, fully cool off, fluid bed outlet material temperature is reduced to below 40 ℃;
(2) produce cold wind with above-mentioned air-cooling apparatus, in water cooling plant, hot-air carries out heat exchange with about 18 ℃ underground water after filtering, obtains 23 ℃, the cold air of relative humidity 35～45%, with it with 80000m
3The flow of/h feeds the vibration cooling tower through ventilation duct 15; Cold wind through the vibration cooling tower is passed in the above-mentioned vibrated fluidized bed by pipeline 13 again, carries out recycling; Collect the waste gas that vibrated fluidized bed is discharged, carry out qualified discharge after the harmless treatment;
(3) go out fluidised bed material by belt feeder inputted vibration cooling tower, the cold wind of material and feeding in cooling tower (about 23 ℃) carries out 1 hour heat exchange, cooled material (about 31 ℃) enters next step operation (after entering the coating machine coating, carrying out finished product packing again);
Thermal material enters vibration cooling storehouse 14 by feed hopper 20, when solid accumulation covers blow vent 22, regulates discharge rate again and charging rate balances each other.Along with the operation of discharging belt, material is descending gradually, cold wind from bottom to top, by cold heating, what the top thermal material ran into is hot blast, what the bottom cold material ran into is cold wind, according to the production concrete condition, regulates air quantity at 70000～90000m
3/ h guarantees that material obtains cooling evenly and fully in descending process.
Above-mentioned used vibration cooling tower is the ZDLQ40 vibration cooling machine (number of patent application: 200710054875.x) that Jingu Drying Engineering Technology Co., Ltd. produces, specifically referring to Fig. 4, Fig. 5, its involving vibrations cooling storehouse 14, feed hopper 20, discharge port 16, vibrating motor 18, zone, middle and lower part in vibration cooling storehouse 14 is provided with ventilation terminal 21, this ventilation terminal 21 is made of regularly arranged groove shape section bar, this transverse section of section material is Λ or ⌒ shape, the air inlet 22 in vibration cooling storehouse 14 is arranged on and ventilation terminal 21 corresponding zones, its air outlet 13 is arranged on the top area in cooling storehouse 14, the vibration cooling is provided with charging aperture 23 directly over the storehouse 14, its top area also is provided with material level observation window 19, air inlet 22 and ventilation duct 15, connecting part between feed hopper 20 and the charging aperture 23 is and is flexible coupling, and the vibrating motor 18 that drives vibration cooling storehouse 14 is installed on the fixed support 17.
2 one kinds of air-cooling apparatuses of embodiment, substantially the same manner as Example 1 referring to Fig. 3, difference is: the filter medium 12 in the air cleaner 3 is rock cotton board; The condensation vapor net sheet 3 that is provided with in the air dehumidifier 3 is the asbestos material; Heating plate is a helix in the air preheater 4.
A kind of high tower granulation fertilizer novel technique for cooling, about 43 ℃ of high workload ambient air temperatures, referring to Fig. 2, its technological process is substantially the same manner as Example 1, and difference is:
Go out the tower material through after belt feeder delivers to bolting about (1) 90 ℃, deliver to vibrated fluidized bed again, thermal material flowed 22 minutes at the fluid bed inner suspension;
(2) in the air device for cooling, hot-air carries out heat exchange with 20 ℃ of underground water after filtering, obtains 24 ℃, the cold air of relative humidity 40～45%, and the cold blast rate that feeds the vibration cooling tower is 1.4: 1 with the mass ratio of going into the tower inventory;
(3) go out fluidised bed material by belt feeder inputted vibration cooling tower, the cold wind of material and feeding in cooling tower (about 22 ℃) carries out 1.4 hours heat exchange;
3 one kinds of air-cooling apparatuses of embodiment, substantially the same manner as Example 1 referring to Fig. 3, difference is: the filter medium 12 in the air cleaner 3 is rock cotton board.
A kind of high tower granulation fertilizer novel technique for cooling, substantially the same manner as Example 1 referring to Fig. 2, difference is:
In step (1) about 95 ℃ go out the tower material through after belt feeder delivers to bolting, deliver to vibrated fluidized bed again, stopped 35 minutes;
In step (2), the cold blast rate that feeds the vibration cooling tower is 1.2: 1 with the mass ratio of going into the tower inventory;
Go out fluidised bed material inputted vibration cooling tower in step (3), the cold wind of material and feeding carries out 35 minutes heat exchange in cooling tower.
4 one kinds of air-cooling apparatuses of embodiment, substantially the same manner as Example 1 referring to Fig. 3, difference is: the condensation vapor net sheet 3 that is provided with in the air dehumidifier 3 is the asbestos material; Heating plate is a helix in the air preheater 4.Cooling pipe network 11 in the heat exchanger 2 is made of spiral pipe.
A kind of high tower granulation fertilizer novel technique for cooling, substantially the same manner as Example 1 referring to Fig. 2, difference is:
In step (1) 80～100 ℃ go out the tower material through after belt feeder delivers to bolting, deliver to vibrated fluidized bed again, stopped 25 minutes;
In step (2), the cold blast rate that feeds the vibration cooling tower is 1.3: 1 with the mass ratio of going into the tower inventory;
Go out fluidised bed material inputted vibration cooling tower in step (3), the cold wind of material and feeding carries out 100 minutes heat exchange in cooling tower.
Claims (10)
1. high tower granulation fertilizer process for cooling is characterized in that it may further comprise the steps:
(1) goes out the tower material and after screening, enter vibrated fluidized bed, and stopped 20～40 minutes, carry out heat exchange with the cold wind that feeds;
(2) produce the cold air of 20～25 ℃ of temperature, relative humidity 30～50% with air-cooling apparatus, it is fed the vibration cooling tower, to cause again in the described vibrated fluidized bed through the cold wind of vibration cooling tower, collect the waste gas that vibrated fluidized bed is discharged, carry out emptying after the harmless treatment;
(3) go out fluidised bed material inputted vibration cooling tower, the cold wind of material and feeding carries out 0.5～1.5 hour heat exchange in cooling tower, and cooled material enters next step operation.
2. high tower granulation fertilizer process for cooling according to claim 1, it is characterized in that, described air-cooling apparatus contains air cleaner, heat exchanger, air dehumidifier and air-introduced machine, be laid with cooling pipe network in the described heat exchanger, this cooling pipe network is a refrigerant with the cold water that flows, heat exchanger air inlet one end is communicated in air cleaner, its gas outlet one end is communicated with air dehumidifier, described air-cooling apparatus also contains air preheater, the air dehumidifier gas outlet is communicated in air preheater, and the gas outlet of air preheater is communicated with air-introduced machine.
3. high tower granulation fertilizer process for cooling according to claim 2 is characterized in that, in the air cleaner of described air-cooling apparatus, is filter medium with cashmere felt or rock cotton board, and this filter medium evenly is fixed in the air cleaner casing.
4. according to claim 2 or 3 described high tower granulation fertilizer process for cooling, it is characterized in that the cooling pipe network in the heat exchanger of described air-cooling apparatus is regularly arranged heat radiation sheet.
5. high tower granulation fertilizer process for cooling according to claim 4 is characterized in that, in the air dehumidifier of described air-cooling apparatus, is the condensation vapor media with asbestos material or fine and close steel wire, and this media evenly is fixed in the dehumidifier casing.
6. high tower granulation fertilizer process for cooling according to claim 5 is characterized in that, is provided with heating plate in the air preheater of described air-cooling apparatus.
7. high tower granulation fertilizer process for cooling according to claim 6 is characterized in that, is provided with volume damper between the air preheater of described air-cooling apparatus and air-introduced machine.
8. high tower granulation fertilizer process for cooling according to claim 7 is characterized in that, in described step
(2) in, described air-cooling apparatus is that refrigerant is produced cold wind with 18～20 ℃ underground water, per 1.5～2kg underground water cooling 1kg air.
9. high tower granulation fertilizer process for cooling according to claim 8 is characterized in that, the cold wind feeding amount of vibration cooling tower is 1～1.5: 1 with the mass ratio of going into the tower inventory.
10. high tower granulation fertilizer process for cooling according to claim 7, it is characterized in that, described vibration cooling tower contains vibration cooling storehouse, feed hopper, discharge port, vibrating motor, zone, middle and lower part in vibration cooling storehouse is provided with ventilation terminal, this ventilation terminal is made of regularly arranged groove shape section bar, this transverse section of section material is Λ or ⌒ shape, the air inlet in vibration cooling storehouse is arranged on and the corresponding zone of ventilation terminal, its air outlet is arranged on the top area in cooling storehouse, the vibration cooling is provided with charging aperture directly over the storehouse, its top area also is provided with the material level observation window, air inlet and cooling duct, connecting part between feed hopper and the charging aperture is and is flexible coupling, and the vibrating motor that drives vibration cooling storehouse is installed on the fixed support.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179371A (en) * | 2010-12-30 | 2011-09-14 | 广东福利龙复合肥有限公司 | Combined drying and sieving device |
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| CN101698621B (en) * | 2009-06-01 | 2012-04-18 | 中化山东肥业有限公司 | Dehumidifying and cooling method in producing high-tower granulation urea-based compound fertilizer |
| CN102161037A (en) * | 2010-12-30 | 2011-08-24 | 广东福利龙复合肥有限公司 | Roller screening device possessing cooling drying function |
| CN102151654A (en) * | 2010-12-30 | 2011-08-17 | 广东福利龙复合肥有限公司 | Screen screening device with cooling and drying functions |
| CN107677025A (en) * | 2017-11-09 | 2018-02-09 | 贵阳开磷化肥有限公司 | A kind of high nitrogen type complex fertilizer product cooling device and its cooling means |
| CN110926111B (en) * | 2019-11-13 | 2021-08-17 | 天津大学 | Moving bed drying method and device for materials |
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