CN2229829Y - Equipment for crystallisation of melamine - Google Patents
Equipment for crystallisation of melamine Download PDFInfo
- Publication number
- CN2229829Y CN2229829Y CN 95213850 CN95213850U CN2229829Y CN 2229829 Y CN2229829 Y CN 2229829Y CN 95213850 CN95213850 CN 95213850 CN 95213850 U CN95213850 U CN 95213850U CN 2229829 Y CN2229829 Y CN 2229829Y
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- CN
- China
- Prior art keywords
- gas
- bed
- housing
- companion
- crystallization apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses the equipment for crystallisation of a cyclical fluidized bed, mainly composed of a main bed, an accompanying bed, a gas inlet, a gas distributor, a gas and solid separator, a heat exchange tube bundle, a discharge port, a material circulating chute, etc. The utility model has the advantages of compact structure, reasonable arrangement, easy control, low requirement to equipment and material and favorable crystallisation effect; specially used in the production of melamine, the utility model can reduce the gas circulation amount, reduce the energy consumption and reduce the equipment investment.
Description
The utility model relates to chemical industry equipment, particularly a kind of melamine crystallization apparatus.
Melamine Production is an essential industry process in the chemical industry.At present comparatively popular preparation technology of melamine is to meet with circulation cold air the quenching crystallizer from the melamine material gas that reactor comes out, and quenching and separating out with crystalloid obtains final products by the product trapping device; The gas of separating out behind the melamine enters the urea scrubbing tower again, unreacted urea and a small amount of melamine particles in the flush away gas make the gas cooling simultaneously, and a part recycles as the cold air of crystallizer, a part is as fluidized gas influent stream fluidized bed reactor, and a part is advanced exhaust gas processing device.In this technology, material gas contacts and crystallization with circulation cold air in crystallizer, and the gas circulation amount is big, energy consumes height, needs use the urea scrubbing tower, and equipment investment is big.
The purpose of this utility model is the above-mentioned defective that overcomes prior art, and a kind of recirculating fluidized bed crystallizer is provided.
Crystallizer described in the utility model comprises main bed shell not, companion's bed housing, the material gas import of main bed housing bottom, the material gas gas distributor of this import top, the fluidization regions of this distributor top, the gas-solid separating device on housing top, heat-exchanging tube bundle in companion's bed housing, the discharge gate on companion's bed housing, the recycle stock inclined tube that communicates with body shell of companion's bed lower housing portion, companion's bed gas feed of companion's bed gas distributor of heat-exchanging tube bundle below and this distributor below.
The particularly main bed housing of described recirculating fluidized bed crystallizer and companion's bed housing communicate on top, described gas-solid separating device comprises fast gas-solid separation device and cyclone separator, described fast gas-solid separation device is selected another patent CN87205749.6 of the inventor especially for use, be tilting coaxial bicone injection of separation device, constitute both coaxial settings by conical nozzle and back taper gas collecting jar with ground-on cover plate.
Described recirculating fluidized bed crystallizer also can further comprise the secondary wind inlet of main bed lower housing portion, is used to introduce secondary wind, improves the Flow of Goods and Materials characteristic in the crystallizer and controls the solid material internal circulating load.
Described crystallizer housing can be with material manufacturings such as low-alloy steel.
Method of operating of the present utility model is that material gas enters crystallizer by the import of material gas, meet through material gas gas distributor and circulation cold burden from the recycle stock inclined tube, separate out crystallization, on the gas-solid two-phase also flows to together, through gas-solid separating device solid is captured, after the heat-exchanging tube bundle heat exchange, a part is discharged from discharge gate as product, a part of solid material as cold conditions enters a main housing through the recycle stock inclined tube and contacts with material gas, and a small amount of companion's gas solid material in companion's gas distributor makes companion's bed is fluidized state.
The utility model utilizes recirculating fluidized bed that material gas is contacted with cold solid material, separates out crystallization, has significantly reduced the gas circulation amount, and has reduced equipment investment and energy consumption, also can produce steam in crystallizer.Can regulate temperature of charge in the crystallization control device by the heat exchange of heat-exchanging tube bundle, control material gas outlet temperature also can be further by secondary air flow control solid material internal circulating load and temperature of charge in desirable scope.Companion's bed gas makes solid material fluidisation in companion's bed, has improved the heat exchange effect.Used gas-solid separating device separative efficiency height, the pressure loss is little.
The utility model compact conformation, connection and reasonable arrangement, control convenience, low to the equipment and materials requirement, crystallization effect is good.
Further describe the utility model below in conjunction with accompanying drawing.
Accompanying drawing is the schematic diagram of a kind of particularly preferred scheme of the present utility model.
Number in the figure 15 is a recirculating fluidized bed crystallizer master bed, and 16 are recirculating fluidized bed crystallizer companion bed, and 17 is heat-exchanging tube bundle, 19 are companion's bed gas distributor, 20 is the secondary wind inlet, and 21 is material gas gas distributor, and 22 is the product discharge gate, 23 is the recycle stock inclined tube, 24 is the fast gas-solid separation device, and 25 is cyclone separator, and 27 is the import of material gas, 28 are the gas feed of companion's bed, and 29 is that main bed housing, 30 is companion's bed housing.
It is depressed when brilliant that device shown in the drawings is used for the melamine material, and operating process is as follows:
Melamine material gas enters recirculating fluidized bed crystallizer master bed housing (29) by material gas import (27), meet with cold conditions melamine solid material and mix through material gas distributor (21) from recycle stock inclined tube (23), on also flowing to together, separate out the crystalline state melamine, the gas-solid two-phase is after the fast gas-solid separation device separates, solid material enters companion's bed housing (30), gas advances cyclone separator (25), the melamine of carrying secretly in the gas is further captured, isolated hot melamine in companion bed (16) after heat-exchanging tube bundle (17) heat exchange, a part is discharged from discharge gate (22) as product, all the other melamine solids as cold conditions enter circulation fluidized bed master bed (15) from recycle stock inclined tube (23) and recycle, after a small amount of companion's bed gas enters companion's bed housing (30) by companion's bed gas feed (28), by companion's bed gas distributor (19), make the melamine material in companion's bed be fluidized state, a spot of secondary wind enters main bed housing (29) by secondary wind inlet (20), by secondary air flow control melamine solid cycle quantity, by heat exchange quantity of steam control melamine solid temperature in companion's bed, thereby temperature of charge in the control fluidized-bed crystallizer, make material gas outlet temperature remain on 170～180 ℃, both allowed the melamine of the overwhelming majority be able to the crystallization capture, make again that high boiling urea and polymer are non-crystallizable to get off, guarantee that the melamine product that captures is not made with extra care and to reach the product quality requirement.
Such scheme of the present utility model is only enumerated as example, and those skilled in the art can carry out various changes or improvement to it, for example this device is used for the processing of other material, but does not all break away from the protection domain of essence of the present utility model and claim.
Claims (6)
1, a kind of crystallization apparatus, it is characterized in that comprising main bed housing, companion's bed housing, the material gas import of main bed housing bottom, the material gas gas distributor of this import top, the fluidization regions of this distributor top, the gas-solid separating device on housing top, the heat-exchanging tube bundle in companion's bed housing, discharge gate on companion's bed housing, the recycle stock inclined tube that communicates with main bed housing of companion's bed lower housing portion, companion's bed gas feed of companion's bed gas distributor of heat-exchanging tube bundle below and this distributor below.
2, crystallization apparatus as claimed in claim 1 is characterized in that main bed housing and mixes a housing communicating on top.
3, crystallization apparatus as claimed in claim 1 is characterized in that described gas-solid separating device comprises fast gas-solid separation device and cyclone separator.
4, crystallization apparatus as claimed in claim 3 is characterized in that described fast gas-solid separation device is made of conical nozzle and back taper gas collecting jar with ground-on cover plate, both coaxial settings.
5, crystallization apparatus as claimed in claim 1 is characterized in that further comprising the secondary wind inlet of leading the bed lower housing portion.
6,, it is characterized in that described housing is the low-alloy steel material as the crystallization apparatus of one of claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95213850 CN2229829Y (en) | 1995-06-14 | 1995-06-14 | Equipment for crystallisation of melamine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95213850 CN2229829Y (en) | 1995-06-14 | 1995-06-14 | Equipment for crystallisation of melamine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2229829Y true CN2229829Y (en) | 1996-06-26 |
Family
ID=33863624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95213850 Expired - Fee Related CN2229829Y (en) | 1995-06-14 | 1995-06-14 | Equipment for crystallisation of melamine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2229829Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845022B (en) * | 2009-03-25 | 2012-07-18 | 丁泽华 | Equipment for crystallizing melamine and by-product thereof by cooling |
| CN105381627A (en) * | 2015-12-14 | 2016-03-09 | 尹明大 | Melamine fluidized bed crystallizer |
| CN105503758A (en) * | 2016-01-18 | 2016-04-20 | 尹明大 | Melamine production system and technique |
| CN105598035A (en) * | 2016-01-08 | 2016-05-25 | 浙江大学 | Parallel connection fluidized bed dry separation device and method |
-
1995
- 1995-06-14 CN CN 95213850 patent/CN2229829Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845022B (en) * | 2009-03-25 | 2012-07-18 | 丁泽华 | Equipment for crystallizing melamine and by-product thereof by cooling |
| CN105381627A (en) * | 2015-12-14 | 2016-03-09 | 尹明大 | Melamine fluidized bed crystallizer |
| CN105598035A (en) * | 2016-01-08 | 2016-05-25 | 浙江大学 | Parallel connection fluidized bed dry separation device and method |
| CN105503758A (en) * | 2016-01-18 | 2016-04-20 | 尹明大 | Melamine production system and technique |
| CN105503758B (en) * | 2016-01-18 | 2019-05-14 | 尹明大 | A kind of Melamine Production system and technique |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |