CN102815538B - A kind of powder that reduces prepares the device of deposition in course of conveying - Google Patents
A kind of powder that reduces prepares the device of deposition in course of conveying Download PDFInfo
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- CN102815538B CN102815538B CN201210291566.5A CN201210291566A CN102815538B CN 102815538 B CN102815538 B CN 102815538B CN 201210291566 A CN201210291566 A CN 201210291566A CN 102815538 B CN102815538 B CN 102815538B
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Abstract
The invention belongs to technical field of industrial powder metallurgy, be specifically related to a kind of powder that reduces and prepare the device of deposition in course of conveying.Being connected by adpting flange and powder flow tubes road between powder stream upstream equipment and powder stream upstream device, outside powder flow tubes road, sheathed high temperature air pipeline, sets fixing anchor ring at high temperature air duct wrap；It is respectively provided with an entrance and an outlet at the sidewall two ends of high temperature air pipeline, is connected by electrodynamic pump, heater and connection pipeline between entrance and exit.So the high temperature air in middle level high temperature air pipeline is as thermal source, and the powdery fluids in inner ring powder flow tubes road, as low-temperature receiver, forms temperature field in inner passage.Utilize fine grain thermophoretic effect and turbulence effect, reduce the deposition in inner pipe wall of the powder in inner circular passage, can effectively reduce the deposition that special powder is prepared in course of conveying, dramatically increase powder main flow concentration；Simple in construction, safe efficient, reliable, widely applicable.
Description
Technical field
The invention belongs to technical field of industrial powder metallurgy, be specifically related to a kind of powder that reduces and prepare the device of deposition in course of conveying.
Background technology
China, in order to continue to walk sustainable development path, equalizes national energy structure, determines to greatly develop nuclear energy.In October, 2007, State Council's official approval " country's nuclear power developing special topic planning (2005-2020) " (hereinafter referred to as " plan ").Should " planning " explicitly point out, to the year two thousand twenty, nuclear power runs installed capacity and strives for reaching 40,000,000 kilowatts, and has 18,000,000 kilowatts of projects in construction to continue after carrying over the year two thousand twenty to." planning " presurized water reactor main force's heap-type as 20 years from now on nuclear power developing of China should be pointed out simultaneously.On May 31st, 2012, " nuclear safety and radioactive pollution preventing and treating " 12 " planning and the year two thousand twenty long-range objectives " (calling " planning " in the following text) obtains passing in principle of Executive Meeting of the State Council with " checking the report of situation about national civilian nuclear facilities comprehensive safety ", and the approval of this two file embodies the policy of safety of China high-efficient development nuclear power.
Undoubtedly, nuclear power makes from now in many decades in the fast development of China, and the demand of nuclear fuel will quickly increase.The market demand to be met, one is must the more uranium ore resource of exploration and development at home；Two are intended to expand the production capacity of nuclear fuel manufacturer, and the ripe efficient production technology practical, simple of exploitation is to adapt to large-scale production.In numerous nuclear fuels, Uranous oxide occupies epochmaking position, and almost all of presurized water reactor is all with uranium dioxide pellet as fuel.
Powder metallurgical technique prepared by Uranous oxide ceramic block, its process includes powder process, pelletizes, shapes, sinters, machines.The primary raw material manufacturing powder of uranium dioxide is the bottled UF from uranium enriching plant6.In the eighties in last century, industrial UF6The process preparing powder of uranium dioxide has 4 kinds, i.e. ADU method, AUC method, IDR method and Russia's independent development are also used for industrial GECO method on a large scale.
ADU method is to name by the english abbreviation of (AmmoniumDiuranate) with the intermediate product weight uranic acid of this process.This process has two critical processes: one is precipitation, and one is reduction.In terms of reduction, ADU to be made decomposes fully, defluorinate, reduction, obtain stable powder of uranium dioxide, a reduction furnace often seems inadequate, the multistage stove of the many employings of present factory process.ADU precipitation is sufficiently complex process, ADU precipitation is carried out in the case of lacking accurate automatic instrument(s), often due to the ADU that the isoparametric slight change of precipitation temperature, acidity and settling velocity causes different shape produces, so that the fluctuation of ADU powder property is relatively big, during clamp dog, it is difficult to obtain the uranium dioxide pellet of stable performance.Just because of this, every country is all updating this flouring technology.China and in the world majority state all use its improved technology.
AUC method is that the intermediate product thricarbonate uranium phthalein with this process is named by the english abbreviation of (AmmoniumUranglCarbonate).Powder of uranium dioxide granule prepared by AUC method is spherical in shape, good fluidity, and fluorinated volume is low, in improved rotary shaping press, is used directly for preparing briquetting.But the same with ADU flow process, AUC, as a kind of wet process, also produces substantial amounts of waste water and waste residue, it is difficult to processes, is unfavorable for environmental conservation.
IDR(IntegratedDryRoute) technique is that Spring-fields factory of Britain succeeded in developing in the phase at the end of the sixties in last century.The most this method is further improved and promotes in the factory of France and the U.S..IDR, as a kind of dry method flow process, has the advantages that flow process is short, production capacity is big, and owing to the waste liquid amount produced is few, HF can also recycle in addition, and therefore the pollution to environment is the least.The powder of uranium dioxide agglutinating property that IDR technique produces is good, and impurity content is low, stable performance, is suitable to add organic pore-forming agents, and owing to powder particle is fine and close, so the ceramic block prepared can be directly loadable into element rod without dried.
The GECO flame method flame method technique that has been former Soviet Union's independent studies, started for producing in 1962.Compared with IDR, GECO method is a kind of substep dry method flow process, and the i.e. the 1st step is by gaseous state UF6An enrichment UO is produced into through flame reactor2Mixture, the 2nd step through two grades of converter defluorinates, be dried, be reduced into qualified powder of uranium dioxide.GECO flame method produces continuous-stable, technology maturation, and does not the most produce waste material, and the fluorine that process produces can recycle with the form of HF, and the powder of uranium dioxide agglutinating property produced, briquettability is excellent, can shape at lower pressures.
By describing above it is recognized that while the powder metallurgical technique of Uranous oxide ceramic block has multiple method at present, but one to can not be ignored objective fact be that powder of uranium dioxide preparation efficiency ratio is relatively low.And technical powder conveying at present is common pipe mostly, powder depositional phenomenon in course of conveying is serious, is to cause one of low major reason with poor stability of powder of uranium dioxide preparation efficiency.Design a kind of powder and prepare the device that can effectively reduce its deposition in course of conveying, have economy and safe value especially for powder of uranium dioxide preparation.Needed for this is also current technical powder metallurgy.
Summary of the invention
It is an object of the invention to for prior art not enough, propose a kind of novel special powder that reduces and prepare the device of deposition in course of conveying.
The technical solution used in the present invention is:
Being connected by adpting flange and powder flow tubes road between powder stream upstream equipment and powder stream upstream device, outside powder flow tubes road, sheathed high temperature air pipeline, sets fixing anchor ring at high temperature air duct wrap；It is respectively provided with an entrance and an outlet at the sidewall two ends of high temperature air pipeline, is connected by electrodynamic pump, heater and connection pipeline between entrance and exit.
Filled phenolic foam composite thermal-insulating materials between described fixing anchor ring and high temperature air pipeline.
Described phenol-formaldehyde foam composite thermal-insulating materials uniformly with the addition of boron carbide, lead, alumina particles, can effectively shield the radiation of neutron, gamma-rays, alpha ray etc..
Air themperature in described high temperature air pipeline higher than the temperature 50 C of powder stream in powder flow tubes road more than.And the temperature difference is the biggest, thermophoretic effect is the strongest, and granule is less susceptible to be deposited on pipeline wall.
Speed air flow in described high temperature air pipeline should be greater than equal to 0.5m/s.
In described high temperature air pipeline, the flow direction of air is contrary with the flow direction of powder stream in powder flow tubes road.Concurrent can also be used, but the effect that adverse current reduces deposition is more preferable.
The invention have the benefit that
This device is thermophoretic effect and the turbulence effect utilizing fine particle, reduces the deposition of fine particle.Compared with common conveyance conduit, this device is effectively reduced fine particle deposition on pipeline wall.This device can be used on technical powder field of metallurgy and nuclear fuel preparation field etc., and other relates in the technical field that powder carries, especially for UO2In powder metallurgy process, reduce UO2Powder deposition on conveyance conduit wall has Important Economic and safe value.There is simple in construction, the feature such as safe efficient, reliable, widely applicable.
Accompanying drawing explanation
Fig. 1 is the system structure schematic diagram of device of the present invention；
Fig. 2 is the schematic three dimensional views of powder transfer member；
Fig. 3 is the profile of transfer member.
1-fixes anchor ring, 2-high temperature air pipeline, 3-powder flow tubes road, 4-adpting flange, 5-powder stream upstream equipment, 6-powder stream upstream device, 7-electrodynamic pump, 8-heater.
Detailed description of the invention
The invention provides a kind of powder that reduces and prepare the device of deposition in course of conveying, the present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
Connected by adpting flange 4 and powder flow tubes road 3 between powder stream upstream equipment 5 and powder stream upstream device 6, at the outer sheathed high temperature air pipeline 2 in powder flow tubes road 3, in the outer sheathed retainer ring face 1 of high temperature air pipeline 2；It is respectively provided with an entrance and an outlet at the sidewall two ends of high temperature air pipeline 3, is connected by electrodynamic pump 7, heater 8 and connection pipeline between entrance and exit.Heater 8 adds hot-air, and electrodynamic pump 7 provides drive ram to high temperature air, drives high temperature air following current or circulated in countercurrent, maintains temperature field in the powder flow tubes road 3 of special powder transfer member.
Filled phenolic foam composite thermal-insulating materials between fixing anchor ring 1 and high temperature air pipeline 2.Phenolic aldehyde foam thermal insulation material is a kind of composite, can effectively reduce heat and scatter and disappear.And this insulation material uniformly with the addition of the radiation proof materials such as boron carbide, lead, aluminum, can effectively shield the radiation of neutron, gamma-rays, alpha ray etc..
Air themperature in high temperature air pipeline 2 higher than the temperature 50 C of 3 powder streams in powder flow tubes road more than.And the temperature difference is the biggest, thermophoretic effect is the strongest, and granule is less susceptible to be deposited on pipeline wall.
Speed air flow in high temperature air pipeline 2 should be greater than 0.5m/s.In high temperature air pipeline 5, the flow direction of air is contrary with the flow direction of powder stream in powder flow tubes road 3.Concurrent can also be used, but the effect that adverse current reduces deposition is more preferable.
Claims (5)
1. one kind is reduced powder and prepares in course of conveying the device of deposition, it is characterized in that, connected by adpting flange (4) and powder flow tubes road (3) between powder stream upstream equipment (5) and powder stream upstream device (6), at powder flow tubes road (3) the most sheathed high temperature air pipeline (2), in high temperature air pipeline (2) the most sheathed retainer ring face (1)；It is respectively provided with an entrance and an outlet at the sidewall two ends of high temperature air pipeline (2), is connected by electrodynamic pump (7), heater (8) and connection pipeline between entrance and exit；Air themperature in described high temperature air pipeline (2) is higher than more than the temperature 50 C of powder flow tubes road (3) interior powder stream.
A kind of powder that reduces the most according to claim 1 prepares the device of deposition in course of conveying, it is characterised in that filled phenolic foam composite thermal-insulating materials between described fixing anchor ring (1) and high temperature air pipeline (2).
A kind of powder that reduces the most according to claim 2 prepares the device of deposition in course of conveying, it is characterised in that uniformly with the addition of boron carbide, lead, alumina particles in described phenol-formaldehyde foam composite thermal-insulating materials.
A kind of powder that reduces the most according to claim 1 prepares the device of deposition in course of conveying, it is characterised in that the speed air flow in described high temperature air pipeline (2) is more than or equal to 0.5m/s.
A kind of powder that reduces the most according to claim 1 prepares the device of deposition in course of conveying, it is characterised in that the flow direction of the interior air of described high temperature air pipeline (2) is contrary with the flow direction of powder flow tubes road (3) interior powder stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210291566.5A CN102815538B (en) | 2012-08-15 | 2012-08-15 | A kind of powder that reduces prepares the device of deposition in course of conveying |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210291566.5A CN102815538B (en) | 2012-08-15 | 2012-08-15 | A kind of powder that reduces prepares the device of deposition in course of conveying |
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| Publication Number | Publication Date |
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| CN102815538A CN102815538A (en) | 2012-12-12 |
| CN102815538B true CN102815538B (en) | 2016-08-03 |
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| CN201210291566.5A Expired - Fee Related CN102815538B (en) | 2012-08-15 | 2012-08-15 | A kind of powder that reduces prepares the device of deposition in course of conveying |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531257B (en) * | 2013-09-12 | 2016-04-06 | 华北电力大学 | The primary Ioops ooling channel of particle deposition in anti-liquid lead bismuth alloy |
| CN103818726A (en) * | 2014-03-14 | 2014-05-28 | 西安元创化工科技股份有限公司 | Dense-phase conveying pipeline for high-concentration powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2573882A1 (en) * | 1984-11-28 | 1986-05-30 | Stockmanu Sa | Automatic transfer of powders in high-temperature enclosures |
| CN1350137A (en) * | 2000-10-24 | 2002-05-22 | 韩国M.A.T.有限公司 | Waste gas pipeline preventing dust from adsorption |
| CN202967570U (en) * | 2012-08-15 | 2013-06-05 | 华北电力大学 | Device capable of reducing powder deposition during preparation and transportation process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08308731A (en) * | 1995-05-17 | 1996-11-26 | Kikkoman Corp | Air flow heat treating device |
| JP2002265051A (en) * | 2001-03-09 | 2002-09-18 | Tsukasa Kogyo Kk | Piping system for pneumatically transporting particulate at high concentration |
| KR101199951B1 (en) * | 2010-07-16 | 2012-11-09 | 주식회사 포스코 | An unit for transporting a powder and An apparatus for supplying a powder |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2573882A1 (en) * | 1984-11-28 | 1986-05-30 | Stockmanu Sa | Automatic transfer of powders in high-temperature enclosures |
| CN1350137A (en) * | 2000-10-24 | 2002-05-22 | 韩国M.A.T.有限公司 | Waste gas pipeline preventing dust from adsorption |
| CN202967570U (en) * | 2012-08-15 | 2013-06-05 | 华北电力大学 | Device capable of reducing powder deposition during preparation and transportation process |
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| CN102815538A (en) | 2012-12-12 |
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