CN102964148A - Improved large granule urea combined drum granulating method and equipment - Google Patents
Improved large granule urea combined drum granulating method and equipment Download PDFInfo
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- CN102964148A CN102964148A CN2012105094557A CN201210509455A CN102964148A CN 102964148 A CN102964148 A CN 102964148A CN 2012105094557 A CN2012105094557 A CN 2012105094557A CN 201210509455 A CN201210509455 A CN 201210509455A CN 102964148 A CN102964148 A CN 102964148A
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Abstract
The invention relates to improved large granule urea combined drum granulating method and equipment. The method comprises the steps of: generating urea granules in a fluidized bed of a combined granulating drum, then discharging the urea granules from the combined granulating drum, enabling the urea granules discharged from the combined granulating drum to enter a moving bed cooler from an inlet at the upper part of the moving bed cooler, forming a dynamic bed layer in the moving bed cooler, enabling cooling air to enter the moving bed cooler via a variable-passage area baseplate arranged on the moving bed cooler, taking away heat of the urea granules through the inverse motion of the dynamic bed layer composed by the urea granules, and discharging and screening the cooled urea granules from the variable-passage area baseplate so as to obtain finished products. According to the method, a combined cooling drum part is saved by adopting the moving bed cooler, so that the large granule urea combined drum granulating process is simplified, energy sources are saved and the cost is reduced.
Description
Technical field
The present invention relates to the technical field of urea production, particularly a kind of improved combined drum granulating large granule urea method and apparatus.
Background technology
The present invention is to be ZL 99122286.5 to the patent No., name is called the improvement application of the patent of invention of " large size particle urea composite rotary drum prilling process and equipment ", the urea of discharging from the combination granulating rotating drum in the summary of the invention of ZL99122286.5 patent will cool off in the combination drum cooler, the combination drum cooler is comprised of rotary drum and built-in ripple plate water cooler, ripple plate water cooler when making owing to steel sheet will be pressed into waveform, and need spot welding between the waveform, its complex process, so combination drum cooler cost and energy consumption are all higher, and the efficient of utilizing ripple plate and rotary drum technology to cool off has much room for improvement, and therefore needs a kind of more advanced, succinct method makes improvements.
Summary of the invention
The present invention is directed to existing large size particle urea composite rotary drum prilling process because the efficient that adopts the combination drum cooler to cause is low, cost and the high problem of energy consumption, a kind of improved combined drum granulating large granule urea method is provided, the method adopts the moving-bed water cooler, save combination drum cooler parts, simplified large size particle urea composite rotary drum prilling process, improved production efficiency and reduced cost.The invention still further relates to a kind of combined drum granulating large granule urea equipment.
Technical scheme of the present invention is as follows:
A kind of improved combined drum granulating large granule urea method, in the fluidized-bed of combination granulating rotating drum, the fusing urea drop evenly is sprayed at urea nucleus particle surface in the fluidized-bed, under fluidization air effect from the bottom to top, urea nucleus particle constantly increases under boiling state, discharge from the combination granulating rotating drum after generating urea granules, it is characterized in that, the urea granules of discharging from the combination granulating rotating drum enters the moving-bed water cooler from the upper entrance of moving-bed water cooler, and in the moving-bed water cooler, form dynamic bed, described moving-bed water cooler has changeable channel area base plate, cooling air enters the moving-bed water cooler from described changeable channel area base plate, by the dynamic bed inverse motion that is formed by urea granules, the urea granules heat is taken out of, and cooled urea granules obtains finished product after described changeable channel area base plate discharge is sieved again.
Changeable channel area base plate in the described moving-bed water cooler adopts horizontal pull mode or flap open-close ways to adjust aisle spare and then changes the speed that urea granules is discharged mobile cold bed water cooler.
In the combination granulating rotating drum, also adopt water coolant spraying gasification to reduce the temperature that urea granules goes out to make up granulating rotating drum.
Combination drum cooler and described moving-bed water cooler also are set unite use.
The urea-containing waste gas of discharging from combination granulating rotating drum and moving-bed water cooler is through bottom that induced draft fan is introduced urea prilling tower the common urea process unit, and from bottom to top motion in described urea prilling tower, be discharged into atmosphere after the fusing urea drop that in described urea prilling tower, the sprays washing from top to bottom.
Described urea-containing waste gas is sent to the dust washing tower when the washability deficiency of urea prilling tower.
Temperature is 85 ℃ of-105 ° of C in the fluidized-bed of described combination granulating rotating drum, and the flow of described fluidization air in fluidized-bed is relevant with fluidization air character, and fusing urea per ton needs fluidization air 2000-5000 cubic meter.
A kind of according to the above-mentioned used equipment of improved combined drum granulating large granule urea method, comprise combination granulating rotating drum and sieve apparatus, it is characterized in that, also comprise the moving-bed water cooler, described moving-bed water cooler links to each other with sieve apparatus with the combination granulating rotating drum respectively, described moving-bed water cooler comprises changeable channel area base plate, opening for feed, blast inlet, discharge port and air outlet, described opening for feed and air outlet all are arranged on the top of moving-bed water cooler, described blast inlet and discharge port arrange all on changeable channel area base plate, the pressure of described air outlet is lower than blast inlet, the urea granules of discharging from the combination granulating rotating drum enters the moving-bed water cooler from the opening for feed on moving-bed water cooler top, cooling air enters the moving-bed water cooler and passes urea granules from the air outlet discharge on moving-bed water cooler top from the blast inlet on the changeable channel area base plate, and cooled urea granules is expelled to sieve apparatus from the discharge port on the changeable channel area base plate.
Changeable channel area base plate in the described moving-bed water cooler is horizontal drawing type changeable channel area base plate or flap folding type changeable channel area base plate.
Described combination granulating rotating drum comprises a plurality of folding shape flights that are arranged on the rotary drum inwall, with coaxial back taper flute profile and the discrepant fluidized-bed of bed wall height that is arranged in the described rotary drum of the rotary drum of combination granulating rotating drum, the atomized water cooling system, the multihole distributor that described fluidized-bed bottom arranges near the bottom, be arranged on fusing urea inlet pipe and fluidization air inlet tube and the cooling water inlet pipe of described rotary drum one side, material discharge port and the airout of opposite side, the correspondence position of described fusing urea inlet pipe and fluidized-bed has a plurality of substance nozzle, and the fluidized-bed length of every 150-500mm is provided with a substance nozzle; Described atomized water cooling system comprises the water-cooled tube with the coaxial setting of rotary drum of making up granulating rotating drum, described water-cooled tube is arranged on the fluidized-bed below of combination granulating rotating drum and is provided with a plurality of cooling water nozzles with the fluidized-bed correspondence position, its injection flow rate is relevant with fusing urea quantity, and its weight ratio is 0-0.05.
Combination drum cooler in the described equipment and the use in parallel of described moving-bed water cooler.
The air outlet of the airout of described combination granulating rotating drum and moving-bed water cooler all is communicated with urea prilling tower or dust washing tower in the common urea process unit by induced draft fan.
Technique effect of the present invention is as follows:
Improved combined drum granulating large granule urea method of the present invention, in the combination granulating rotating drum, the conversion of urea nucleus particle is generated urea granules, the urea granules of discharging from the combination granulating rotating drum enters the moving-bed water cooler, and in the moving-bed water cooler, form dynamic bed, changeable channel area base plate in the moving-bed water cooler enters cooling air, with the dynamic bed inverse motion that is formed by urea granules, namely this cooling air moves from bottom to top, the dynamic bed that urea granules forms moves from top to bottom, cooling air and urea granules carry out thermal exchange, so cooling air can be taken the heat of urea granules out of, cooled urea granules obtains finished product after described changeable channel area base plate discharge is sieved again.The present invention improves existing combined drum granulating large granule urea method, save combination drum cooler parts, adopt the moving-bed water cooler of ad hoc structure to cool off by the urea granules that the moving-bed cooling technology will make up the granulating rotating drum discharge, adopt changeable channel area base plate so that urea granules forms dynamic bed in the moving-bed water cooler, with the cooling air adverse current to carry out the cooling of urea granules, mode than ripple plate water cooler and rotary drum cooling is simply direct, simplified large size particle urea composite rotary drum prilling process, obviously reduced energy consumption, save energy, can also improve the cooling efficiency of urea granules, need not to adopt complex structure and the high combination drum cooler parts of cost, so reduced the cost of granular urea combination granulation, saved great amount of investment.
Changeable channel area base plate in the moving-bed water cooler adopts horizontal pull mode or flap open-close ways to adjust aisle spare, and then the change urea granules is discharged the speed of mobile cold bed water cooler, further, changeable channel area base plate is set adjusts aisle spare by horizontal pull mode or flap open-close ways according to real needs, can prolong the cooling air that enters in the moving-bed water cooler with duration of contact of urea granules, increase the contact area of cooling air and urea granules, so that cooling air is taken away the heat of urea granules more fully, increase heat transfer effect.
In the fluidized-bed of combination granulating rotating drum, the fusing urea drop evenly is sprayed at urea nucleus particle surface in the fluidized-bed, fluidization air solidifies and cooling the bonding fusing urea of urea nucleus particle surface, in the combination granulating rotating drum, also adopt water coolant spraying gasification, vaporization heat helps the urea nucleus particle of the bonding fusing urea in surface further to lower the temperature, the final urea granules that reduces generation goes out to make up the temperature of granulating rotating drum, reaches the effect of the total energy consumption that reduces granulation.
Combination drum cooler and described moving-bed water cooler are set unite use, the combination drum cooler of this moment is as auxiliary cooling device, so the making to the combination drum cooler requires lower, and the combination drum cooler can adopt bantam, its cost and energy consumption are lower than existing equipment equally, certainly because the efficient of moving-bed water cooler is higher than the combination drum cooler, so needn't start the combination drum cooler without Special Circumstances.
The urea-containing waste gas of discharging from combination granulating rotating drum and moving-bed water cooler is under specific circumstances introduced the common urea process unit in the urea prilling tower through induced draft fan, be discharged into atmosphere after the fusing urea drop washing of in described urea prilling tower, spraying from top to bottom, utilize the urea prilling tower in the existing urea process device that urea-containing waste gas is washed, simplified the granular urea production technique, production cost is greatly reduced.Described urea-containing waste gas also can arrange a small-sized dust washing tower and carry out the waste gas washing when the washability deficiency of urea prilling tower, and laid down cost and the energy consumption of this moment are lower than existing equipment equally.Certainly, the dust washing tower still is being set generally speaking, the urea-containing waste gas of discharging from combination granulating rotating drum and moving-bed water cooler also can carry out the waste gas washing in induced draft fan is introduced dust prilling tower the common urea process unit.
Description of drawings
Fig. 1 is the structural representation of the improved combined drum granulating large granule urea method flow diagram of the present invention and equipment used.
Fig. 2 is the first preferred flow charts of the improved combined drum granulating large granule urea method of the present invention and the first preferred structure synoptic diagram of equipment used.
Fig. 3 is the second preferred flow charts of the improved combined drum granulating large granule urea method of the present invention and the second preferred structure synoptic diagram of equipment used.
Fig. 4 is the structural representation of moving-bed water cooler of the present invention.
Fig. 5 a and 5b are two kinds of preferred structure synoptic diagram of the changeable channel area base plate in the moving-bed water cooler shown in Figure 4.
Each symbology is as follows among the figure:
The 1-fusing urea; The 2-fluidization air; The 3-water coolant; 4-returning charge particle; The 5-finished product; 6-makes up granulating rotating drum; 7-moving-bed water cooler; The 8-sieve apparatus; 9-makes up drum cooler; The 10-pulverizer; 11-dust washing tower; The 12-urea prilling tower; The 13-vibratory screening apparatus; The 14-melting device; The 15-urea pump; The 16-induced draft fan; 17-changeable channel area base plate; The 18-housing; The 19-opening for feed; The 20-air outlet.
Embodiment
The present invention will be described below in conjunction with accompanying drawing.
The present invention relates to a kind of improved combined drum granulating large granule urea method, the method is to generate first urea granules and discharge in the fluidized-bed of combination granulating rotating drum, the urea granules of discharging enters the moving-bed water cooler and cools off, obtain finished product, schema as shown in Figure 1 after sieving by sieve apparatus again.Fusing urea 1 and fluidization air 2 are all introduced in the combination granulating rotating drum by pipeline, in the fluidized-bed of combination granulating rotating drum, fusing urea 1 drop evenly is sprayed at the urea nucleus particle surface in the fluidized-bed, under fluidization air 2 effects from the bottom to top, urea nucleus particle constantly increases under boiling state, discharges from the combination granulating rotating drum behind the urea granules of the different sizes of generation; Enter the moving-bed water cooler from the urea granules that makes up the granulating rotating drum discharge and cool off, cooled urea granules obtains finished product 5 after the discharge of moving-bed water cooler is sieved by sieve apparatus again.
The method of the invention adopts specific moving-bed water cooler to make up the cooling process of the urea granules of granulating rotating drum discharge, the structure of moving-bed water cooler as shown in Figure 4, the moving-bed water cooler comprises changeable channel area base plate 17, housing 18, opening for feed 19 and air outlet 20.The top opening for feed 19 of the urea granules moving-bed water cooler of discharging from the combination granulating rotating drum enters the moving-bed water cooler, and in the moving-bed water cooler, form dynamic bed, cooling air enters the moving-bed water cooler from changeable channel area base plate 17, by the dynamic bed inverse motion that is formed by urea granules, the urea granules heat is taken out of, the dynamic bed temperature that urea granules is formed progressively reduces from top to bottom, cooling air temperature progressively improves from top to bottom, reach cooling air and directly contact the purpose that reduces the urea granules temperature with urea granules, cooled urea granules is discharged from changeable channel area base plate 17.
Changeable channel area base plate 17 preferred horizontal pull mode or the flap open-close ways of adopting in the moving-bed water cooler are adjusted aisle spare, respectively shown in Fig. 5 a and 5b, changeable channel area base plate 17 is adjusted aisle spare by horizontal pull mode or flap open-close ways according to real needs, can prolong the cooling air that enters in the moving-bed water cooler with duration of contact of urea granules, and then the change urea granules is discharged the speed of mobile cold bed water cooler, increase the contact area of cooling air and urea granules, so that cooling air is taken away the heat of urea granules more fully, increase heat transfer effect.When the urea granules speed that enters the moving-bed water cooler from opening for feed 19 equates with the urea granules speed of discharging the moving-bed water cooler, form the material level of a running balance in the moving-bed water cooler.
The improved combined drum granulating large granule urea method of the present invention preferably adopts water coolant spraying gasification to reduce the temperature that urea granules goes out to make up granulating rotating drum in the combination granulating rotating drum, the first preferred flow charts as shown in Figure 2, fusing urea 1 and fluidization air 2 are all introduced in the combination granulating rotating drum 6 by pipeline, water coolant 3 also is set also is incorporated in the combination granulating rotating drum 6 by pipeline.Temperature is preferably 85 ℃-105 ℃ in the fluidized-bed of combination granulating rotating drum 6, and the flow of fluidization air 2 in fluidized-bed is relevant with fluidization air character, and it is 2000-5000 cubic meters that fusing urea 1 per ton needs the flow of fluidization air 2.Fluidization air 2 solidifies and cooling the bonding molten urea solution of urea nucleus particle surface, and the temperature that fusing urea 1 enters combination granulating rotating drum 6 is 134 ° of C ± 1 ° C, is solidifying under the effect of fluidization air 2 and is being cooled to about 90 ° of C.The water coolant 3 of sending into combination granulating rotating drum 6 by pipeline is liquid water when sending into, and atomizing step of going forward side by side becomes vapourous water in the combination granulating rotating drum, help the surface bonding the urea nucleus particle of fusing urea 1 further lower the temperature.If the cooling effect of fluidization air 2 has reached the technique purpose certainly, the pipeline of water coolant 3 also can be in closing condition, needn't drop into combination granulating rotating drum 6.
In the combined drum granulating large granule urea method shown in Figure 2, also adopted combination drum cooler 9, combination drum cooler 9 is united use with moving-bed water cooler 7.Certainly because the efficient of moving-bed water cooler 7 is higher than combination drum cooler 9, as needn't start combination drum cooler 9 without Special Circumstances.Cooled urea granules enters sieve apparatus 8 and is divided into three the tunnel: send pulverizer 10 broken rear returning as crystal seed (Figure 2 shows that returning charge particle 4) foldback to make up granulating rotating drum 6 after the top layer oversize granule is drawn, the middle level is that finished product 5 is sent as qualified product, and the defective small-particle of lower floor is drawn rear direct foldback and returned combination granulating rotating drum 6(returning charge particle 4 as shown in Figure 2).After being sieve apparatus 8 screenings, excessive urea granules returns again granulation in the combination granulating rotating drum 6 together through pulverizing and too small urea granules.
Flow process shown in Figure 2 is that the urea-containing waste gas that will make up granulating rotating drum 6 and 7 discharges of moving-bed water cooler is sent to 11 washings of dust washing tower.The second preferred flow charts that also can be as shown in Figure 3, the bottom of urea-containing waste gas urea prilling tower 12 in induced draft fan 16 introducing common urea process units of granulating rotating drum 6 and 7 discharges of moving-bed water cooler will be made up, and from bottom to top motion in described urea prilling tower 12, be discharged into atmosphere after the fusing urea drop that in described urea prilling tower 12, the sprays washing from top to bottom.The urea granules that urea prilling tower 12 bottoms generate enters melting device 14 through vibratory screening apparatus 13 screenings than small-particle, is fused into molten state urea and is sent to urea pump 15 in the urea technique device, beats past urea prilling tower 12 and pushes up again granulation; The larger particles that vibratory screening apparatus 13 sieves out be sent to combination granulating rotating drum 6 interior as described urea nucleus particle for the production of the qualified urea granules of particle (being finished product 5), can improve the production efficiency of combination granulating rotating drum 6.Certainly, when urea-containing waste gas when the washability of urea prilling tower 12 is not enough, also can be sent to the dust washing tower, dust washing tower 11 as shown in Figure 2 namely can also be set.
The used equipment of improved combined drum granulating large granule urea method involved in the present invention, as shown in Figure 1, comprise the combination granulating rotating drum, moving-bed water cooler and the sieve apparatus that connect successively, the structure of the moving-bed water cooler that adopts as shown in Figure 4, comprise changeable channel area base plate 17, housing 18, opening for feed 19, blast inlet, discharge port and air outlet 20, opening for feed 19 and air outlet 20 all are arranged on the top of moving-bed water cooler, and blast inlet and discharge port arrange all on changeable channel area base plate 17.Changeable channel area base plate 17 is preferably the flap folding type changeable channel area base plate shown in the horizontal drawing type changeable channel area base plate shown in Fig. 5 a or Fig. 5 b, and the changeable channel area base plate 17 in the moving-bed water cooler adopts horizontal pull mode or flap open-close ways to form dynamic bed to adjust aisle spare and then to change the speed that urea granules is discharged mobile cold bed water cooler.Blast inlet place on air outlet 20 and the changeable channel area base plate 17 causes certain pressure reduction by blower fan, the pressure of air outlet 20 is lower than blast inlet, the dynamic bed that cooling air is formed by urea granules by processing requirement, blast inlet pressure keep negative pressure, normal pressure or malleation all can.The urea granules of discharging from the combination granulating rotating drum enters the moving-bed water cooler from the opening for feed 19 on moving-bed water cooler top, rely on from the top down gravity movement at moving-bed water cooler 6 interior urea granules, cooling air enters the moving-bed water cooler and passes urea granules from air outlet 20 discharges on moving-bed water cooler top from the blast inlet on the changeable channel area base plate 17, be cooling air and urea granules inverse motion, both fully contact and carry out heat exchange, reach the effect of urea granules cooling, cooled urea granules is expelled to sieve apparatus from the discharge port on the changeable channel area base plate 17.Leave the urea granules temperature of moving-bed water cooler 6 and can be down to 50 ° below the C.
Equipment the first preferred structure synoptic diagram of the present invention comprises combination granulating rotating drum 6, moving-bed water cooler 7, combination drum cooler 9, sieve apparatus 8, pulverizer 10 and dust washing tower 11 as shown in Figure 2.Wherein make up granulating rotating drum 6 and comprise a plurality of folding shape flights that are arranged on the rotary drum inwall, with coaxial back taper flute profile and the discrepant fluidized-bed of bed wall height that is arranged in the described rotary drum of the rotary drum of combination granulating rotating drum, the atomized water cooling system, the multihole distributor that the fluidized-bed bottom arranges near the bottom, be arranged on fusing urea inlet pipe and fluidization air inlet tube and the cooling water inlet pipe (fusing urea 1 that difference is corresponding shown in Figure 2 of described rotary drum one side, fluidization air 2 and water coolant 3), material discharge port and the airout of opposite side, the correspondence position of described fusing urea inlet pipe and fluidized-bed has a plurality of substance nozzle, and the fluidized-bed length of every 150-500mm is provided with a substance nozzle; Described atomized water cooling system comprises the water-cooled tube with the coaxial setting of rotary drum of making up granulating rotating drum, described water-cooled tube is arranged on the fluidized-bed below of combination granulating rotating drum and is provided with a plurality of cooling water nozzles with the fluidized-bed correspondence position, its injection flow rate is relevant with fusing urea quantity, and its weight ratio is 0-0.05.
Among Fig. 2, combination drum cooler 9 is in parallel with moving-bed water cooler 7, and namely both unite use.Moving-bed water cooler 7 can isolated operation, and both also can move simultaneously during such as needs, certainly because the efficient of moving-bed water cooler 7 is higher than combination drum cooler 9, as needn't start combination drum cooler 9 without Special Circumstances.The output of sieve apparatus is divided into three the tunnel: the pulverizer 10 of leading up to connects combination granulating rotating drum 6, returns combination granulating rotating drum 6 as crystal seed (Figure 2 shows that returning charge particle 4) foldback after sending pulverizer 10 fragmentations after the top layer oversize granule is drawn; One the tunnel directly exports as finished product 5; Another road directly connects combination granulating rotating drum 6, is used for that the defective small-particle of lower floor is drawn rear direct foldback and returns combination granulating rotating drum 6(returning charge particle 4 as shown in Figure 2).Combination granulating rotating drum 6 is connected the urea-containing waste gas of discharging and is connected dust washing tower 11 and carry out the waste gas washing with the moving-bed water cooler.
Fig. 3 is the second preferred structure synoptic diagram of equipment of the present invention, with the difference of Fig. 2 is, structure shown in Figure 3 does not arrange combination drum cooler 9, but uses separately the moving-bed water cooler.In addition, the airout of combination granulating rotating drum 6 and the air outlet of moving-bed water cooler 7 all are communicated with the bottom of urea prilling tower 12 in the common urea process unit by induced draft fan 16, will make up urea-containing waste gas that granulating rotating drum 6 and moving-bed water cooler 7 discharge through bottom that induced draft fan 16 is introduced urea prilling tower 12 in the common urea process units, and from bottom to top motion in described urea prilling tower 12, be discharged into atmosphere after the fusing urea drop that in described urea prilling tower 12, the sprays washing from top to bottom.Simultaneously, the urea granules of urea prilling tower 12 bottoms generation pushes up again granulation through getting to urea prilling tower 12 behind vibratory screening apparatus 13, melting device 14 and the urea pump 15 successively.Certainly, the dust washing tower still is being set generally speaking, the urea-containing waste gas of discharging from the moving-bed water cooler also can carry out the waste gas washing in induced draft fan is introduced dust prilling tower the common urea process unit.
Should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this specification sheets has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can make amendment or be equal to replacement the invention; in a word, all do not break away from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (12)
1. improved combined drum granulating large granule urea method, in the fluidized-bed of combination granulating rotating drum, the fusing urea drop evenly is sprayed at urea nucleus particle surface in the fluidized-bed, under fluidization air effect from the bottom to top, urea nucleus particle constantly increases under boiling state, discharge from the combination granulating rotating drum after generating urea granules, it is characterized in that, the urea granules of discharging from the combination granulating rotating drum enters the moving-bed water cooler from the upper entrance of moving-bed water cooler, and in the moving-bed water cooler, form dynamic bed, described moving-bed water cooler has changeable channel area base plate, cooling air enters the moving-bed water cooler from described changeable channel area base plate, by the dynamic bed inverse motion that is formed by urea granules, the urea granules heat is taken out of, and cooled urea granules obtains finished product after described changeable channel area base plate discharge is sieved again.
2. improved combined drum granulating large granule urea method according to claim 1, it is characterized in that the changeable channel area base plate in the described moving-bed water cooler adopts horizontal pull mode or flap open-close ways to adjust aisle spare and then changes the speed that urea granules is discharged mobile cold bed water cooler.
3. improved combined drum granulating large granule urea method according to claim 1 and 2 is characterized in that, also adopts water coolant spraying gasification to reduce the temperature that urea granules goes out to make up granulating rotating drum in the combination granulating rotating drum.
4. improved combined drum granulating large granule urea method according to claim 1 is characterized in that, combination drum cooler and described moving-bed water cooler also is set unites use.
5. improved combined drum granulating large granule urea method according to claim 1 and 2, it is characterized in that, the urea-containing waste gas of discharging from combination granulating rotating drum and moving-bed water cooler is through bottom that induced draft fan is introduced urea prilling tower the common urea process unit, and from bottom to top motion in described urea prilling tower, be discharged into atmosphere after the fusing urea drop that in described urea prilling tower, the sprays washing from top to bottom.
6. improved combined drum granulating large granule urea method according to claim 5 is characterized in that, described urea-containing waste gas is sent to the dust washing tower when the washability deficiency of urea prilling tower.
7. improved combined drum granulating large granule urea method according to claim 1 and 2, it is characterized in that, temperature is 85 ℃-105 ℃ in the fluidized-bed of described combination granulating rotating drum, the flow of described fluidization air in fluidized-bed is relevant with fluidization air character, and fusing urea per ton needs fluidization air 2000-5000 cubic meter.
8. one kind according to claim 1 to one of the 7 used equipment of described improved combined drum granulating large granule urea method, comprise combination granulating rotating drum and sieve apparatus, it is characterized in that, also comprise the moving-bed water cooler, described moving-bed water cooler links to each other with sieve apparatus with the combination granulating rotating drum respectively, described moving-bed water cooler comprises changeable channel area base plate, opening for feed, blast inlet, discharge port and air outlet, described opening for feed and air outlet all are arranged on the top of moving-bed water cooler, described blast inlet and discharge port arrange all on changeable channel area base plate, the pressure of described air outlet is lower than blast inlet, the urea granules of discharging from the combination granulating rotating drum enters the moving-bed water cooler from the opening for feed on moving-bed water cooler top, cooling air enters the moving-bed water cooler and passes urea granules from the air outlet discharge on moving-bed water cooler top from the blast inlet on the changeable channel area base plate, and cooled urea granules is expelled to sieve apparatus from the discharge port on the changeable channel area base plate.
9. equipment according to claim 8 is characterized in that, the changeable channel area base plate in the described moving-bed water cooler is horizontal drawing type changeable channel area base plate or flap folding type changeable channel area base plate.
10. according to claim 8 or 9 described equipment, it is characterized in that, described combination granulating rotating drum comprises a plurality of folding shape flights that are arranged on the rotary drum inwall, with coaxial back taper flute profile and the discrepant fluidized-bed of bed wall height that is arranged in the described rotary drum of the rotary drum of combination granulating rotating drum, the atomized water cooling system, the multihole distributor that described fluidized-bed bottom arranges near the bottom, be arranged on fusing urea inlet pipe and fluidization air inlet tube and the cooling water inlet pipe of described rotary drum one side, material discharge port and the airout of opposite side, the correspondence position of described fusing urea inlet pipe and fluidized-bed has a plurality of substance nozzle, and the fluidized-bed length of every 150-500mm is provided with a substance nozzle; Described atomized water cooling system comprises the water-cooled tube with the coaxial setting of rotary drum of making up granulating rotating drum, described water-cooled tube is arranged on the fluidized-bed below of combination granulating rotating drum and is provided with a plurality of cooling water nozzles with the fluidized-bed correspondence position, its injection flow rate is relevant with fusing urea quantity, and its weight ratio is 0-0.05.
11. according to claim 8 or 9 described equipment, it is characterized in that, also comprise the combination drum cooler, described combination drum cooler and the use in parallel of described moving-bed water cooler.
12. according to claim 8 or 9 described equipment, it is characterized in that the air outlet of the airout of described combination granulating rotating drum and moving-bed water cooler all is communicated with urea prilling tower or dust washing tower in the common urea process unit by induced draft fan.
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| CN104693135A (en) * | 2013-12-04 | 2015-06-10 | 山东联合化工股份有限公司 | Urea-caking-proofing urine washing tower |
| US10544064B2 (en) | 2014-10-28 | 2020-01-28 | Yara International Asa | Fluidized bed granulation |
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| CN102964148B (en) | 2014-07-16 |
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Effective date of registration: 20220729 Address after: No. 406, cage building, No. 31, North 3rd Ring Middle Road, Haidian District, Beijing 100088 Patentee after: Beijing Dalike Technology Co.,Ltd. Address before: Room 822, tomorrow life hall, 218 Tangli Road, Lishuiqiao, Chaoyang District, Beijing 100012 Patentee before: Li Sibin |