CN202823078U - Fluidized bed dust removal device for cooling urea - Google Patents
Fluidized bed dust removal device for cooling urea Download PDFInfo
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- CN202823078U CN202823078U CN 201220523237 CN201220523237U CN202823078U CN 202823078 U CN202823078 U CN 202823078U CN 201220523237 CN201220523237 CN 201220523237 CN 201220523237 U CN201220523237 U CN 201220523237U CN 202823078 U CN202823078 U CN 202823078U
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Abstract
The utility model discloses a fluidized bed dust removal device for cooling urea. The dust removal device comprises a fluidized bed (1), a vibrating screen (2), a separator (3), and a washing tower (4), wherein the fluidized bed (1) comprises a feeding hole (11) of urea, a discharge hole (12), a bed body (13) and a gas distribution plate (14); the vibrating screen (2) comprises a flow inlet and flow outlet (22); the separator (3) comprises an inlet, a gas outlet (32) at the top part, and a dust outlet (33) at the bottom part; and the washing tower (4) comprises a gas emptying outlet (42) at the top part, a dilute urine outlet, and a return inlet (45) at the bottom part. The dust removal device is characterized in that a conveying section (6) for collecting dust is arranged below the vibrating screen (2) and the dust outlet (33) of the separator (3); and the outlet of the conveying section (6) is arranged on a dust packaging section. The dust removal device has the advantages of simple structure; and the separated dust is conveyed to the dust packaging section and then recycled. Therefore, the production cost can be greatly reduced.
Description
Technical field
The utility model relates to a kind of dust arrester, especially refers to a kind of dust removal unit for urea cooling fluidized bed.
Background technology
In the production of urea, last granulation process is subjected to the restriction of the factors such as output, operation and equipment, and urea powder " bridging " high because of temperature occur, so that the easily phenomenon of " hardening " appears in the urea product after the packing, had a strong impact on market sale and the product price of urea.Therefore, reduce temperature and the content of powder of urea product, become the Important Action that improves Urea Exterior Quality, at present, ripe method is to adopt gas-solid fluidization technology and fluidized bed plant to realize the cooling of urea granules and the removal of powder.In the Large Scale Urea Plant of China's import, because granulation tower or prilling granulator are less than normal, not only temperature is high to making finished urea temperature drift, particularly summer, and the ammonia content in the finished urea is higher, ammonia is highly seasoned, make be packed in bag after, urea from caking is serious, bring very large difficulty for the sale of product, the finished urea of ad eundem per tonly will hang down 30～50 yuan on selling on the price, has directly affected the benefit of enterprise.
Existing a kind of patent No. is that 200820171375.4 Chinese utility model patents that are called " dust removal unit for urea cooling fluidized bed " disclose a kind of dust removal unit for urea cooling fluidized bed, it is characterized in that: the top outlet inlet at fluid bed is connected with separator one by pipeline, the top gaseous phase outlet of separator one is connected with the import of air-introduced machine, and the outlet of air-introduced machine is connected with separator two again.The air stream outlet at described separator two tops is connected with the dust washing recover by pipeline, and the thin urine that the dust washing recover reclaims pressurizes through circulating pump by pipeline, one the tunnel is connected with the import of returning of dust washing recover, and Urea Evaporation workshop section is then delivered on another road.But this utility model complex structure, less stable, its structure is still waiting further improvement.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of simple in structure, easy to maintenance and can be with a kind of dust removal unit for urea cooling fluidized bed of dust recycling for above-mentioned prior art present situation.
The utility model solves the problems of the technologies described above the technical scheme that adopts: this dust removal unit for urea cooling fluidized bed, comprise fluid bed, vibratory sieve, separator and scrubbing tower, described fluid bed comprises the charging aperture of urea, discharging opening and bed body, the bottom of described fluid bed is equipped with the gas distribution grid with the air blast hole, this gas distribution grid is connected by the outer air blast of pipeline and fluid bed, the inflow entrance of described vibratory sieve is connected with the discharging opening of fluid bed, the flow export of described vibratory sieve is connected with finished product packing section, described fluid bed top is provided with gas vent, described gas vent is connected with the import of separator through pipeline, the top of described separator is provided with the gas outlet, described gas outlet is connected with the entrance of scrubbing tower through pipeline, the bottom of described separator is provided with the dust outlet, the top of described scrubbing tower is provided with gas emptying outlet, the bottom of described scrubbing tower is provided with the thin urine outlet of dust washing, described thin urine outlet is connected with the import of returning of scrubbing tower through circulating pump one tunnel by pipeline, and another road is connected with Urea Evaporation workshop section by pipeline, it is characterized in that: be provided with the delivery section of collecting dust under the outlet of the dust of described vibratory sieve and separator, the outlet of described delivery section is positioned at the dust packing department.
As improvement, described separator has two, described fluid bed top is provided with two gas vents, described gas vent is connected with the corresponding import of separator by pipeline respectively, the dust outlet of described separator bottom lay respectively at delivery section directly over, and the outlet of the gas at described separator top is connected with the entrance of scrubbing tower through the pipe of joining by pipeline respectively.
As improvement, described dust outlet below is provided with dust collecting box, described dust collecting box be positioned at delivery section directly over.
As improvement, the percent opening in air blast hole can be preferably 3%～8% on the described gas distribution grid; The aperture is preferably 2.5～3.5mm.
As improvement, described separator is double cyclone.
As improvement, be provided with axial id fan in the described gas emptying outlet.
Compared with prior art, the utility model adopts under the dust outlet of described vibratory sieve and separator and is provided with the delivery section of collecting dust, and the outlet of described delivery section is positioned at the dust packing department.Its advantage is: the design of this urea fluidized cooling device and industrial the actual running results see that this device has the following advantages:
(1) Gu adopt gas/fluidization technology to carry out the cooling of urea, has cooling effectiveness height, simple in structure, floor space is little, investment is low, stable operation is reliable, easy to maintenance advantage for urea granules.
(2) adopt suitable fluid bed elutriation speed, can effectively reduce dust content in the urea product, improve the apparent mass of urea product.
(3) in design, use rectangular fluidized bed and surface bed laminarization technology, can reduce the fluid bed granulate back-mixing, reduced pressure drop and abrasion of particles.
(4) adopt the guiding distribution grid, increased the propulsive force of bed, impel the time of staying of particle to be consistent, reduce part particle overstand and cause sub-cooled and collision crashing, cause the moisture absorption caking.
(5) low resistance cyclone separator and ash exhauster are adopted in the combination of this device, can effectively capture, reclaim carbamide dust, guarantee that tail gas reaches discharge standard, and environmental contamination reduction forms a cover than more complete processing unit.
(6) adopt wash mill, through atomizer and packing layer solution washing, absorption, gas is drained in the atmosphere behind the wire mesh demister precipitation of liquid droplets of cat head in tower.Exhaust gas meets discharging standards fully, and cleaning solution is recycling, has both reduced urea production consumption, has protected again environment.
Description of drawings
Fig. 1 is process chart of the present utility model.
The specific embodiment
Below in conjunction with embodiment the utility model is described in further detail.
Dust removal unit for urea cooling fluidized bed shown in Figure 1, comprise fluid bed 1, vibratory sieve 2, separator 3 and scrubbing tower 4, described fluid bed 1 comprises the charging aperture 11 of urea, discharging opening 12 and bed body 13, the bottom of described fluid bed is equipped with the gas distribution grid 14 with the air blast hole, this gas distribution grid 14 is connected by the outer air blast 15 of pipeline and fluid bed, the inflow entrance 21 of described vibratory sieve 2 is connected with the discharging opening 12 of fluid bed, the flow export 22 of described vibratory sieve 2 is connected with finished product packing section, described fluid bed 1 top is provided with gas vent 16, and described gas vent 16 is connected with the import 31 of separator 3 through pipeline; Described separator 3 has two, described fluid bed top is provided with two gas vents 16, described gas vent 16 is connected with the corresponding import 31 of separator 3 by pipeline respectively, the dust of described separator 3 bottoms outlet 33 lay respectively at delivery section 6 directly over, described dust exports 33 belows and is provided with dust collecting box 34, described dust collecting box 34 be positioned at delivery section 6 directly over, and the gas at described separator 3 tops outlet 32 is connected with the entrance 41 of scrubbing tower 4 through the pipe of joining by pipeline respectively; The top of described scrubbing tower 4 is provided with gas emptying outlet 42, the bottom of described scrubbing tower 4 is provided with the thin urine outlet 43 of dust washing, described thin urine outlet 43 is connected with the import 45 of returning of scrubbing tower 4 through circulating pump 44 one tunnel by pipeline, and another road is connected with Urea Evaporation workshop section 5 by pipeline, be provided with the delivery section 6 of collecting dust under the dust outlet 33 of described vibratory sieve 2 and separator 3, the outlet of described delivery section 6 is positioned at the dust packing department.The percent opening in air blast hole is 3%～8% on the wherein said gas distribution grid 14, and the aperture is 2.5～3.5mm, and described separator 3 is double cyclone.
Below the utility model is described in further detail.
The design of Fluidized bed principle
Fluidized bed plant utilizes aerodynamic principle exactly, effect by air blast and air-introduced machine, make the go forward side by side exchange heat of promoting the circulation of qi, solid phase of urea violent boiling in fluid bed, make its fast cooling, remove powder, cooled urea enters packing department by discharge gate, thereby reaches the purpose of finished urea cooling, dedusting; The tail gas that contains a large amount of dust is discharged by the fluid bed top, and constantly is inhaled into and carries out the separating of powder, recovery in deduster and the scrubbing tower, and the tail gas after the purification is drawn by axial flow blower and is drained in the atmosphere.
1, the mensuration of urea granules fluidization condition
In fluid bed, air upwards holds up particle by the urea granules bed with certain flow velocity, urea granules can be flowed freely in bed, whole bed has flow regime, the operation of fluid bed is subject to the restriction of two speed, one is lowest speed, i.e. critical fluidised form speed, and another is the speed that urea granules is taken out of.For spherical urea granules, when the urea granules weight on air is long-pending by the pressure difference unit of the equaling bed surface of bed and buoyancy were poor, the urea bed namely was in suspended state, and this moment, gas speed was minimum fluidizing velocity:
The gravity of particle is: F
G=Vr
m=π d
3r
m/ 6,
In the formula: d----particle diameter, m;
r
m----grain density, kg/m
3
In general r
G＜r
m, r
GBe gas density, kg/m
3The buoyancy of particle is ignored, and ascending air makes particle do even ascending motion to the active force of particle.
2, the endocorpuscular critical fludization velocity of fluid bed
Calculate the fluid bed critical fludization velocity, when upwards passing through particle layers for fixed bed stage fluid, the pressure drop of bed will increase with the increase of flow velocity in the starting stage, when flow velocity is increased to a certain numerical value, when the particle weight on fluid is long-pending by the pressure unit of the equaling bed surface of bed and buoyancy are poor, bed namely is in suspended state, and this moment, gas speed was critical fludization velocity, and this also is the important evidence of judging fluidized bed process gas speed.In the fluid bed for a certain urea granules, its critical fludization velocity can represent with following formula:
In the formula: Re
MfReynolds number under the-critical fludization velocity, and for spheric granules:
Remf＝25.71×[(1+5.53×10
-5Ga)
0.5-1]
Ga---Galileo number, l;
ρ f---gas density, kg/m
3
ρ s---grain density, kg/m
3
μ f---gas viscosity, Pas;
Dp---particle average grain diameter, m;
G---acceleration of gravity, 9.81m/s
2
3, the endocorpuscular elutriation speed of fluid bed
Speed when elutriation speed refers to then that gas can be taken the urea granules material out of fluid bed generally can represent with following formula:
In the formula: Ret---the Reynolds number under the elutriation speed, and for spheric granules, then: Ret=dpt ρ
fUt/ μ f
Ut---elutriation speed, m/s;
Dpt---elutriation particle maximum particle diameter, m.
4, the key data of experiment test in the fluid bed
Mainly measure critical fludization velocity and the elutriation speed, particularly critical fludization velocity of urea granules at laboratory stage.Design and the main device of experiment: main device comprises air blast, spinner flowmeter, cylindrical fluidisation bed (external diameter 100mm, wall thickness 1.5mm), distribution grid, cyclone separator, U-shaped hook gauge etc.It is slightly different that air quantity increases progressively the curve of Δ P2-P3 when successively decreasing with air quantity: when air quantity increased progressively, pressure differential had a maximum after air quantity reaches certain value, and bed becomes fluid bed by fixed bed subsequently, and pressure differential slightly descends, and then keeps constant.And when air quantity successively decreased, it is constant that pressure differential keeps when the fluidisation attitude, and after bed had fluid bed to change fixed bed into, pressure differential reduced and descends with air quantity.This be because, when particle is changed to fluid bed by fixed bed, owing to cause particle different from the natural packing state during filling, larger pressure differential need to be arranged with its fluidisation, and particle is when changing from fluid bed to fixed bed, and the particle packing situation conforms to natural packing, and pressure differential can further not increase, so, reduce the speed that direction extension line and air quantity increase progressively curve intersection point to air quantity when critical fludization velocity should be constant pressure differential.
Learn that from above-mentioned U point air quantity is 62.3m during critical fludization velocity
3/ h, the pressure differential position 79mmH that it is corresponding
2O, because experiment is 97mm with the cylindrical bed internal diameter, so, for this sample urea granules, carry out fluidisation with air as fluid, its critical fludization velocity is approximately:
5, the Granules in Fluidized Bed calculating that designs a model
Particle is done the transmission of gas-solid two-phase heat in the rectangle shallow fluidized bed.Getting dH * dL infinitesimal analyzes.Infinitesimal dL air-flow is temperature rising dT behind dH from bottom to top
f, the heat of this temperature rise is passed to by particle in the infinitesimal, namely obtains material outlet place particle temperature and gas vent mean temperature.
The particle temperature Tso at material outlet place then is:
Tso＝Tfi+(Tsi-Tfi)exp{-K[1-exp(-A·Ht)]}
The mean temperature of gas vent is Tfo.
In the formula: A=h α BLt/G
fG
p
K＝GfCpf/Gs?Gps
h＝λ
fN?u/dp
Nu＝0.353?Rep
0.9(dp/Hf)
0.47(do/P)
0.19；
Nu---nusselt number, l;
Tso---particle outlet temperature, ℃;
Tsi---particle inlet temperature, ℃;
Tfi---gas feed temperature, ℃;
Tfo---gas vent mean temperature, ℃;
B---rectangular fluidized bed width, m;
Lt---fluid bed length, m;
H---fluidized bed heat exchanger coefficient, W/ (m
2K);
λ f---Measurement of Gas Thermal Conductivity, W/ (mK);
α---specific grain surface is long-pending, and spherical specific area is: m
2/ m
3
Ht---voidage is the bed conversion height of zero (ε=0);
Ht＝H
f(1-εmf)/R，，m；
Hf---fluid bed granulate Height of fluidized layer, m;
R---fluid bed bed expansion ratio, zero dimension;
ε
Mf---the voidage during minimum fluidization velocity, zero dimension;
Do---distribution grid opening diameter, m;
P---distribution grid perforate spacing, m;
Rep---particle Reynolds number, zero dimension.
6, the technological parameter of unit for urea cooling fluidized bed device
According to above basic principle and data as calculated: just can be taken by gas out of various urea particle diameter critical speeds and fluidizing velocity tables of data when average 0.8mm dust fluidizing velocity reaches 4.11m/s:
The main technologic parameters of fluidized bed plant as calculated:
(1), critical speed: 0.46m/s
(2), fluidizing velocity: 6.45m/s
(3), empty bed speed: 4.01m/s
(4), distribution grid open-cellular form: shape hole, garden
(5), distribution grid perforate aperture: Φ 3-Φ 5mm
(6), bed area: 11.6m
2
(7), bed length-width ratio: 2.9: 1
(8), cooler drag overall: 2600Pa
7, efficient diffusion cyclone separator is selected
Efficient diffusion cyclone separator is applicable to capture the graininess dust of dry non-fiber, main feature is that stack shell is turbination, thereby reduced dusty gas and be shorted to the possibility that outlet is gone from the stack shell center, for reducing the accumulation of dust in cyclone separator, the design has cancelled conical radiation shield, for preventing that the dust that twice air-flow will separate from rolling again, taken out of by ascending air, increased the inclination angle of Membrane Separator Cylinder for CFB Boiler inverted cone.Thereby improved efficiency of dust collection.
The dust pelletizing system of fluidized bed plant (is the separator in the utility model, together lower) employing series connection twin-stage flow process, the primary dust removing device is main dust removal part, particularly the straight tube segregation section on primary dust removing device top is the key component of dedusting, gas carries out the first time to be separated at the middle part of primary dust removing device, can be considered the first separation district, remaining gas entrained particles arrives "conesep" then, can be considered the secondary separation district; Middle clean gas is discharged deduster and is entered secondary ash collector, the dust of further carrying secretly in the divided gas flow.
Because the large (242000m of the tolerance of this device
3/ h), for reducing resistance, reduce inlet gas speed, 2 twin-stage fume recovery systems are set, be the dust content that further reduces in the system outlet gas, be provided with wet scrubbing recovery tower (being the scrubbing tower in the utility model, lower same) in the back of cyclone separator.
The efficient of cyclone separator is not only relevant with gas access speed, and relevant with the maintenance of the concentration of the relative density of gas temperature, gas humidity, dust and granularity, dusty gas and body, under the same case, gas temperature is higher, operate in that dew-point temperature is above, dust density and granularity is larger, the efficient of the higher separator of gas dust content is just higher, need to prove, when cyclone separator leaks out, when particularly leaking out by the deduster bottom, its efficient will sharply descend.When air leak rate of air curtain is 5%, purification efficiency will drop to 50% by 90%, and when air leak rate of air curtain reaches 15%, efficiency of dust collection will drop to zero.Therefore, to note in the production safeguarding, in time eliminate leak source.
8, brief description of the process
The industrial application of fluid bed is a lot, in the dust separation Industrial Plant Design, and capital equipment: the design of the design of fluid bed main body, the design of cleaner, the design of air cleaning dehumidification equipment, power-equipment etc.Typical process flow:
This dust removal unit for urea cooling fluidized bed, brief description of the process is as follows: out urea is incorporated in the fluid bed body through belt feeder and star-like feed at the bottom of the urea prilling tower; After process cool-down dehumidification and the dry air that heats up pressurize by air blast, it is more than dew-point temperature, air blast send the air of an amount of drying to enter the fluid bed bottom under the control of frequency converter, make urea acutely boiling in fluid bed by gas air distribution plate in the fluid bed, simultaneously by the walking forward in fluid bed of prism Wind power propelling urea, not only reduce the urea temperature but also separated the dust in the urea in the progradation, thereby improved the presentation quality of product, improved the market competitiveness; At the fluid bed top, carry the gas of carbamide dust, by being installed in the axial id fan suction function at scrubbing tower top, carbamide dust is introduced cyclone separator, under the effect of efficient double cyclone, can go out the carbamide dust of carrying secretly in the gas by effective separation, separation rate reaches 99%, and the cyclone separator exit gas enters scrubbing tower; Urea granules after fluidized bed processing is qualified finished urea greater than 1.0mm, and finished urea imports to packaging system by belt feeder; Be drawn in the scrubbing tower from cyclone separator top gas out, solution washing, absorption in atomizer and packing layer in tower, gas is extracted out, is drained in the atmosphere by the axial id fan of cat head behind the wire mesh demister precipitation of liquid droplets of cat head.Exhaust gas meets discharging standards fully, and cleaning solution is recycling, send Urea Evaporation workshop section after reaching finite concentration.The carbamide dust of discharging from the cyclone separator bottom send packaging system through belt, or carries out returning urea system after the melting, also can do the raw material of urea-base compound fertilizer and melamine.
This urea fluidized cooling device is domestic cooling and the dedusting of at first adopting shallow-layer, rectangular bed fluidization technique to be applied to urea, and the application of process urea producer shows: system's stable operation is reliable, can satisfy the requirement of urea granules cooling and dedusting.For the problem of granulation tower cooling capacity deficiency after the urea system solution volume increase, greatly save the investment that needs to increase granulation tower because increase production, and can obviously improve the presentation quality of urea product, improve the market competitiveness.
The fluidisation cooling technology is a traditional chemical unit, commercial Application is also commonplace, but use the fluidisation cooling technology for urea plant and have certain novelty, simultaneously, the star-like feeder of exquisite perforate distribution grid, efficient cyclone separator and novel designs is combined into a comparatively complete system, is the post-processing technology of an innovation.Can increase substantially the apparent mass of urea, satisfy the actual requirement of producer, and produce preferably economic benefit and social benefit.
9, the technology advantage of urea cool stream gasifying device
According to technological requirement, in conjunction with the actual conditions of company, production brings following change to existing urea behind the fluidized bed plant that starts:
(1) the package unit floor space is 9200X17000mm, takes full advantage of existing equipment and space, need not to change existing urea technology of the package and civil engineering, and plant investment is few, small accommodation area.
(2) this device need not increase more power-equipment, and cooling, cleaner is reasonable in design, and operating cost is low, and maintenance cost is few, and the cycle of operation is long.
(3) this device operational effect is good: the amplitude of cooling can reach 15-25 ℃, and less than the particle below the Φ 1.0mm, separation rate reaches more than 99%, contains the dust tail gas dust rate of recovery and reaches more than 99%.
(4) this device capital equipment is under the subnormal ambient and works, and dust reclaims and adopts efficient cyclone to separate the method that adds spray washing, and non-dusting secondary pollution can realize cleaning and carry out production strictly in line with rules and regulations.
(5) this device power-equipment adopts frequency control, and air adopts the cool-down dehumidification device, is particularly suitable for south humidity, hot environment use, can realize in Various Seasonal the optimal combination of cooling, dust removing effects and power consumption.
Capital equipment list and quotation
Annotate:
1, the feed belt machine is 1 about 100,000 yuan
2, discharging belt conveyer is 1 about 100,000 yuan
3, dust packing charges (comprising belt feeder) is about 200,000 yuan
4, freight is about 100,000 yuan
5, the design drawing information costs is about 350,000 yuan
6, can not estimated charges about 200,000 yuan
About 5,500,000 yuan of device gross investment
Economic and Efficiency Analysis
About 5,500,000 yuan of flow of urea gasifying device gross investment, effectively reduce the urea granules temperature after the operation, and greatly reduced the dust content of finished urea, can effectively eliminate the ammonia flavor, correspondingly solved the agglomeration problems of urea product in storage process, the product appearance quality is improved greatly.It has not only strengthened the market competitiveness of urea, and the urea selling price can improve 20～60 yuan/t on year-on-year basis, and for the urea enterprise that produces 500000 tons per year, the annual operating cost of removing has a net increase of that benefit is minimum to be reached more than 5,000,000 yuan, and is recyclable in its investment 1 year.
Sum up
Use this dust removal unit for urea cooling fluidized bed, can solve effectively that the finished urea temperature is high, dust content is large, average grain diameter is less than normal, the ammonia flavor is large, deposit the problem such as easy caking, thereby satisfy urea market bulky grain, without dust, without ammonia flavor, non-caking demand characteristics.Set up urea cool stream gasifying device, not only improved the market competitiveness of urea enterprise product, promote the technological progress of enterprise and improved the equipment of enterprise, also make enterprise obtain good economic benefit.It is the utility unit of a kind of small investment, duration weak point, instant effect.
Claims (7)
1. dust removal unit for urea cooling fluidized bed, comprise fluid bed (1), vibratory sieve (2), separator (3) and scrubbing tower (4), described fluid bed (1) comprises the charging aperture (11) of urea, discharging opening (12) and bed body (13), the bottom of described fluid bed is equipped with the gas distribution grid in air blast hole (14), this gas distribution grid (14) is connected by the outer air blast (15) of pipeline and fluid bed, the inflow entrance (21) of described vibratory sieve (2) is connected with the discharging opening (12) of fluid bed, the flow export (22) of described vibratory sieve (2) is connected with finished product packing section, described fluid bed (1) top is provided with gas vent (16), described gas vent (16) is connected with the import (31) of separator (3) through pipeline, the top of described separator (3) is provided with gas outlet (32), described gas outlet (32) is connected with the entrance (41) of scrubbing tower (4) through pipeline, the bottom of described separator (3) is provided with dust outlet (33), the top of described scrubbing tower (4) is provided with gas emptying outlet (42), the bottom of described scrubbing tower (4) is provided with the thin urine outlet (43) of dust washing, described thin urine outlet (43) is connected with the import (45) of returning of scrubbing tower (4) through circulating pump (44) a tunnel by pipeline, and another road is connected with Urea Evaporation workshop section (5) by pipeline, it is characterized in that: be provided with the delivery section (6) of collecting dust under the dust outlet (33) of described vibratory sieve (2) and separator (3), the outlet of described delivery section (6) is positioned at the dust packing department.
2. dust removal unit for urea cooling fluidized bed according to claim 1, it is characterized in that: described separator (3) has two, described fluid bed top is provided with two gas vents (16), described gas vent (16) is connected with the corresponding import (31) of separator (3) by pipeline respectively, the dust outlet (33) of described separator (3) bottom lay respectively at delivery section (6) directly over, and the gas at described separator (3) top outlet (32) is connected with the entrance (41) of scrubbing tower (4) through the pipe of joining by pipeline respectively.
3. dust removal unit for urea cooling fluidized bed according to claim 2 is characterized in that: described dust outlet (33) below is provided with dust collecting box (34), described dust collecting box (34) be positioned at delivery section (6) directly over.
4. dust removal unit for urea cooling fluidized bed according to claim 2 is characterized in that: the percent opening in the upper air blast hole of described gas distribution grid (14) is 3%～8%.
5. dust removal unit for urea cooling fluidized bed according to claim 2 is characterized in that: the aperture in the upper air blast hole of described gas distribution grid (14) is 2.5～3.5mm.
6. dust removal unit for urea cooling fluidized bed according to claim 2, it is characterized in that: described separator (3) is double cyclone.
7. arbitrary described dust removal unit for urea cooling fluidized bed in 6 according to claim 1 is characterized in that: be provided with axial id fan (46) in the described gas emptying outlet (42).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220523237 CN202823078U (en) | 2012-09-27 | 2012-09-27 | Fluidized bed dust removal device for cooling urea |
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408331A (en) * | 2013-07-08 | 2013-11-27 | 河南晋开化工投资控股集团有限责任公司 | Dust-free urea cooling method |
| CN108416147A (en) * | 2018-03-13 | 2018-08-17 | 安徽工业大学 | A kind of once dust collection of converter OG systematic parameter computer-implemented methods |
| CN113304610A (en) * | 2021-06-04 | 2021-08-27 | 西安建筑科技大学 | Fluidized cooling and conveying system and process for desulfurized circulating ash |
-
2012
- 2012-09-27 CN CN 201220523237 patent/CN202823078U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408331A (en) * | 2013-07-08 | 2013-11-27 | 河南晋开化工投资控股集团有限责任公司 | Dust-free urea cooling method |
| CN108416147A (en) * | 2018-03-13 | 2018-08-17 | 安徽工业大学 | A kind of once dust collection of converter OG systematic parameter computer-implemented methods |
| CN108416147B (en) * | 2018-03-13 | 2021-12-03 | 安徽工业大学 | Computer-aided design method for parameters of converter one-time dust removal OG system |
| CN113304610A (en) * | 2021-06-04 | 2021-08-27 | 西安建筑科技大学 | Fluidized cooling and conveying system and process for desulfurized circulating ash |
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