CN101113110A - Carbamide dust reclaiming method - Google Patents
Carbamide dust reclaiming method Download PDFInfo
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- CN101113110A CN101113110A CNA2007101372088A CN200710137208A CN101113110A CN 101113110 A CN101113110 A CN 101113110A CN A2007101372088 A CNA2007101372088 A CN A2007101372088A CN 200710137208 A CN200710137208 A CN 200710137208A CN 101113110 A CN101113110 A CN 101113110A
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- dust
- urea
- filtering
- recycling
- carbamide
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Abstract
The invention provides a recycling method of urea dust, which is applied to the recycling of ammonia and urea dust produced in the producing process of urea. The steps of the method are that: (1) the end gas containing urea dust comes into a filter of urea dust reclaimer to be filtered; (2) recycling water with pressure regularly sprays the filtering net, and the water solution of urea comes back to urea producing system. The invention has the advantages of adopting wet method and filtering technology to recycle urea dust, running without outside mechanic energy for the system resistance is comparatively low, energy conservation and low material consumption, simple structure, easy operation, being easy to be repaired and replaced, low treatment cost, which is applied to mechanical ventilation tower and natural ventilation. The urea dust recycling technology of the invention absorbs the dust by adding water in the filtering process, and uses filtering material as a carrier, and employs the interception and absorption functions thereof to dust particles, greatly increases the contacting area between gas and liquid, and accelerates the recycling rate and effect, and the recycling rate reaches up to 95%. The dust purification efficiency of the waste gas and the concentration of recycling solution can be controlled through regulating the water inflow and water inflow interval only need to determine the concentration and flux of the discharged dust of granulating tower.
Description
Technical field
The present invention relates to the method that a kind of carbamide dust reclaims, be applicable to the ammonia and the carbamide dust removal process that produce in the urea production process.
Background technology
In the urea tower granulation process, inevitably can produce dust, the dust concentration that prilling tower produces increases along with production-scale expansion.Not only the ambient atmosphere environment is exerted an influence, also cause a large amount of losses of urea product simultaneously.Produce in the urea process at prilling tower, the reason that produces dust mainly contains: chemical reaction process; The concentrated of urea steam condenses; The shower nozzle working accuracy is not high, sprays when especially spray orifice is irregular to produce; The undesired generation of shower nozzle operational stage; Various mechanical force fragmentations, the fragmentation when Ru Tadi scrapes machine and rotates, particle are before and after the cooling and the collision between tower wall or the particle; The urea granules of the not enough level of granulation; Meteorological conditions etc.
By improving production technique and using advanced production unit can reduce the generation of dust to a certain extent.In the stability that can improve explained hereafter, can reduce again under the prerequisite of carbamide dust quantity discharged, be to solve carbamide dust except that making great efforts to improve the design and operation of prilling tower, increasing device for recovering powder, the effective way of protection environment.
At present, the method for recovery dust has dry method and wet method on the power ventilation urea prilling tower.Because urea has character soluble in water, the home and abroad is adopted hydrometallurgic recovery usually.Traditional hydrometallurgic recovery carbamide dust device has following three kinds: (1) spraying---strainer (Japanese Toyo Engineering Corporation patent), dust laden air washes macrobead come through spray section earlier, after filtration fine particle and water smoke is removed again.(2) three sections washing filtering dust-removal systems (U.S. NoyesData house journal) can be handled waste gas and waste water simultaneously.Dust laden air from prilling tower enters filtration tank by the bottom, filters the back discharging through filtering layer.(3) liquid gas jet device system is simultaneously as ventilation power and scrubbing dust collection (Italian Snamprogetti house journal).
The problem that the method for these several wet dedustings exists mainly shows following several respects:
A. resistance drop is bigger, and the authorized pressure that surpasses the natural ventilation prilling tower falls, and is mainly used in the power ventilation prilling tower.
B. overcome the resistance of retrieving arrangement by adding mechanical energy, the value of energy consumption is often suitable with the value that reclaims urea.
C. dust contacts with the washings that sprays in the uphill process in tower, and gas, liquid can not fully contact, and processing efficiency is low.
D. equipment volume is big, the use cost height, and structure is complicated, is unfavorable for maintenance.
By retrieval, Chinese patent CN 1609100A is the improvement application to Chinese patent CN 1293187A patent of invention, announce a kind of method of improved clarifying gas containing urea powder, it is characterized in that the urea melts is sent to double rotating drum fluidized-bed large granule urea plant carries out granulation, the carbamide dust gas that contains that is produced is sent into behind the tail gas washing tower washing, purifying discharging or is sent into prilling tower and discharge after by the urea melts drop absorption cleaning of inverse motion.Chinese patent CN 1507936A discloses a kind of new profile shaft, radial purification contains the carbamide dust gas apparatus, it is characterized in that being provided with filter screen in tower body inside, and described filter screen is telescopic or the baffle plate type filter screen.
Summary of the invention
The problem that exists in the retrieving arrangement at existing tower granulation carbamide dust, the present invention looks for another way, provide a kind of simple in structure, result of use good, be beneficial to the carbamide dust recovery method of maintenance, save energy.
Purpose of the present invention can realize by following measure:
The method that a kind of carbamide dust reclaims comprises the steps:
(1), the tail gas that the contains carbamide dust filtering net that enters the carbamide dust withdrawer filters
Urea prilling tower is produced in the urea process discharging, and to contain carbamide dust concentration be 100～400mg/m
3, temperature is the tail gas about 70 ℃, tail gas enters carbamide dust withdrawer 6 from cat head exhaust duct 5 by dust inlet a, body b (bed filtration web frame) filters after filtration, the dust granules that particle diameter is bigger is blocked, the particle diameter smaller particles is adsorbed in twine.Filter back tail gas is discharged from waste gas outlet e.
Carbamide dust withdrawer 6 outer wall materials should choose anti-ly wash away, the material of erosion resistance, as stainless steel.To be that the bed filtration net is overlapping form filtering bodies b, and the filtering net housing is selected stainless steel frame for use, filtering net need choose anti-ly wash away, the material of erosion resistance, as polypropylene fibre filter screen etc.The specification limit of filtering net: silk footpath 1.0～5.0mm, aperture 3.0～10.0mm.
(2), band presses regularly spray filtering body of recirculated water, aqueous solution of urea returns carbamide production system
When filtering tail gas, band is pressed regularly spray filtering body b of recirculated water blowing mouth of a river c, and the carbamide dust that filters, is adsorbed in filtering bodies b is water-soluble, and the high concentration urea aqueous solution of formation is sent carbamide production system back to by reclaiming liquid outlet d.
Withdrawer size and filtering net specification should be calculated according to processing condition and determine among the present invention.Should be in the operating process according to the dust concentration in the discharging waste gas and whole injection flow rate of dust-precipitator pressure falling tone and water spraying time, to reach comparatively ideal recovering effect.
Use beneficial effect of the present invention to be:
(1) the present invention adopts wet method and filtration process to reclaim carbamide dust, because systemic resistance is less, does not need can turn round by adding mechanical energy, energy-saving and cost-reducing, simple in structure, be convenient to operation, for ease of maintenaince, change, processing cost is lower, can be used for power ventilation tower and natural ventilation tower.
(2) use carbamide dust recovery technology provided by the invention, adding water in filtration procedure reclaims, with the filtering material is carrier, utilize interception, the adsorption function of filtering bodies to dust granules, simultaneously also increased the contact area of liquid, gas greatly, quicken recovery rate and recovering effect, the rate of recovery reaches more than 95%; Simultaneously, reduce water consumption, improved the concentration that reclaims liquid, be convenient to recycle than other hydrometallurgic recovery.
(3) use carbamide dust recovery method provided by the invention, only need to determine prilling tower discharging dust concentration and flow, can be by regulating the concentration that flooding quantity and water inlet are controlled the purification efficiency of dust in the waste gas pitch time and reclaimed liquid.
Description of drawings
Fig. 1 is the retrieving arrangement structure iron of carbamide dust recovery method of the present invention
Among the figure: a. dust inlet
B. filtering net
C. water jet
D. reclaim the liquid outlet
E. waste gas outlet
Fig. 2 is a process flow sheet of the present invention
Among the figure: 1. the urea melt enters the mouth
2. prilling tower shower nozzle
3. urea prilling tower
4. prilling tower air intake vent
5. exhaust duct
6. carbamide dust withdrawer
7. urea product outlet
Embodiment
Invention is further described again with case history below in conjunction with accompanying drawing:
As shown in Figure 1 and Figure 2, temperature rising in the tower makes extraneous air enter through ventilation opening 4 at the bottom of the tower in natural ventilation prilling tower 3 granulation process; Reach 99% above 138 ℃ high temperature through evaporation concentration concentration and dissolve urine and spray through 1 rotary nozzle 2 of sending into prilling tower that enters the mouth with the speed of 70t/h, urea dissolves drop in 70 meters cat head dropping process, meets 5.6～7.0 * 10
5m
3/ h flow temperature be 20 ℃ at the bottom of tower ventilation opening 4 go into the air of tower, urea droplets is cured as 50 ℃ of left and right sides finished granule urea through cooling, phase transformation, process of cooling in dropping process, sent by the outlet of the urea product at the bottom of the tower 7.
Simultaneously, the carbamide dust concentration that contains of generation is 400mg/m
3, temperature be tail gas about 70 ℃ with air-flow with 6.0 * 10
5m
3/ h (167m
3/ s) V-bar enters four carbamide dust withdrawer 6 (mean air flow amounts 1.5 * 10 from cat head exhaust duct 5 by dust inlet a
5m
3/ h), the filtering bodies b of organizine footpath 1.0～5.0mm filters, and the dust granules that particle diameter is bigger in the filtration procedure is blocked, and the less dust granules of particle diameter is adsorbed in twine.Water jet c is with 1.34 * 10
6m
3The average water yield spray filtering pitch time net b of/h, the carbamide dust that filters, is adsorbed in mesh and twine is water-soluble, and the aqueous solution of urea that forms concentration 3-10% is sent carbamide production system back to by reclaiming liquid outlet d.
Filter back tail gas is discharged from waste gas outlet e, and the urea rate of recovery reaches more than 95%.
Carbamide dust withdrawer 6 outer wall materials are chosen stainless material in the application example; Filtering bodies b filtrate is chosen the polypropylene fibre filter screen, and filtering bodies b housing is selected stainless steel frame for use.Withdrawer 6 dust inlet a diameter 4.0m; The long 6.0m of strainer inwall main body, wide 4.5m, high 4.5m, wall thickness 5cm; The bed filtration net materials is filled filtering bodies b; Reclaim liquid outlet d diameter 20cm; Waste gas outlet e diameter 4.0m.
Claims (2)
1. the method that reclaims of a carbamide dust is characterized in that carrying out according to the following steps:
Urea prilling tower is produced in the urea process discharging, and to contain carbamide dust concentration be 100～400mg/m
3, temperature is the tail gas about 70 ℃, tail gas enters the carbamide dust withdrawer from the cat head exhaust duct, body filters after filtration, the dust granules that particle diameter is bigger in the filtration procedure is blocked, the particle diameter smaller particles is adsorbed in twine; When filtering tail gas, band is pressed regularly spray filtering body of recirculated water, and the carbamide dust that filters, is adsorbed on the filtering bodies is water-soluble, and the higher concentration aqueous solution of urea of formation is sent carbamide production system back to; Filter back tail gas is discharged from waste gas outlet.
2. the method that a kind of carbamide dust according to claim 1 reclaims, it is characterized in that carbamide dust withdrawer outer wall materials should choose anti-ly wash away, the material of erosion resistance, as stainless steel.To be that the bed filtration net is overlapping form filtering bodies, and the filtering net housing is selected stainless steel frame for use; Filtering net need choose anti-ly wash away, the material of erosion resistance, as polypropylene fibre filter screen etc.The specification limit of filtering net: silk footpath 1.0～5.0mm, aperture 3.0～10.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101372088A CN101113110A (en) | 2007-07-11 | 2007-07-11 | Carbamide dust reclaiming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101372088A CN101113110A (en) | 2007-07-11 | 2007-07-11 | Carbamide dust reclaiming method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101113110A true CN101113110A (en) | 2008-01-30 |
Family
ID=39021667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101372088A Pending CN101113110A (en) | 2007-07-11 | 2007-07-11 | Carbamide dust reclaiming method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101113110A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091494A (en) * | 2010-12-28 | 2011-06-15 | 付长营 | Spray purification organic waste gas treatment method and device |
| CN108355410A (en) * | 2018-02-24 | 2018-08-03 | 卡梅德生物科技（天津）有限公司 | A kind of dust-extraction unit |
| CN109641812A (en) * | 2016-10-13 | 2019-04-16 | 科氏农艺服务有限责任公司 | The recycling of the component of waste stream is processed from urea and is reused |
-
2007
- 2007-07-11 CN CNA2007101372088A patent/CN101113110A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091494A (en) * | 2010-12-28 | 2011-06-15 | 付长营 | Spray purification organic waste gas treatment method and device |
| CN109641812A (en) * | 2016-10-13 | 2019-04-16 | 科氏农艺服务有限责任公司 | The recycling of the component of waste stream is processed from urea and is reused |
| CN108355410A (en) * | 2018-02-24 | 2018-08-03 | 卡梅德生物科技（天津）有限公司 | A kind of dust-extraction unit |
| CN108355410B (en) * | 2018-02-24 | 2020-07-28 | 卡梅德生物科技（天津）有限公司 | Dust removing device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080130 |